:root {

    --primary: #2347c5;
    --primary-strong: #18348f;
    --primary-dim: rgba(35,71,197,0.10);
    --primary-glow: rgba(35,71,197,0.18);
    --accent: #c0841c;
    --accent-soft: rgba(192,132,28,0.12);
    --danger: #be3a2b;
    --success: #1f7a5a;
    --warning: #c0841c;
    --info: #2347c5;
    --bg: #ece9e0;
    --surface: #f8f6ef;
    --surface-2: #e1ddd1;
    --border: #d4cfc0;
    --border-strong: #b8b2a0;
    --text: #16140d;
    --text-2: #565145;
    --text-3: #8a8675;
    --navbar-bg: rgba(236,233,224,0.9);
    --grad-brand: linear-gradient(116deg, #2347c5 0%, #4f6fe0 100%);
    --grad-danger: linear-gradient(135deg, #be3a2b 0%, #c0841c 100%);
    --font-display: 'Space Grotesk', 'Segoe UI', system-ui, sans-serif;
    --font-body: 'IBM Plex Sans', 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', monospace;

    --radius: 5px;
    --radius-lg: 9px;
    --radius-xl: 14px;
    --shadow: 0 1px 2px rgba(22,20,13,0.05), 0 1px 3px rgba(22,20,13,0.04);
    --shadow-md: 0 4px 16px rgba(22,20,13,0.08);
    --shadow-lg: 0 14px 36px rgba(22,20,13,0.13);
    --shadow-primary: 0 4px 14px rgba(35,71,197,0.22);
    --on-primary: #ffffff;
}

html.dark-mode {
    --primary: #6e8bf5;
    --primary-strong: #92a9f9;
    --primary-dim: rgba(110,139,245,0.16);
    --primary-glow: rgba(110,139,245,0.18);
    --accent: #e0a94b;
    --accent-soft: rgba(224,169,75,0.16);
    --danger: #e0594a;
    --success: #4fb38c;
    --warning: #e0a94b;
    --info: #6e8bf5;
    --bg: #101218;
    --surface: #181b22;
    --surface-2: #21242d;
    --border: #2c3038;
    --border-strong: #3e434e;
    --text: #eceae1;
    --text-2: #a4a299;
    --text-3: #6f6e66;
    --navbar-bg: rgba(16,18,24,0.9);
    --grad-brand: linear-gradient(116deg, #6e8bf5 0%, #9bb0fb 100%);
    --shadow: 0 1px 2px rgba(0,0,0,0.4);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.5);
    --shadow-lg: 0 20px 48px rgba(0,0,0,0.7);
    --on-primary: #0b0d12;
}

html.dark-mode, html.dark-mode * { color-scheme: dark; }

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    padding-top: 72px;
    transition: background-color 0.25s, color 0.25s;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-16px); }
    to   { opacity: 1; transform: translateX(0); }
}
@keyframes slideInRight {
    from { opacity: 0; transform: translateX(16px); }
    to   { opacity: 1; transform: translateX(0); }
}
@keyframes bounceIn {
    0%  { transform: scale(0.9); opacity: 0; }
    65% { transform: scale(1.02); }
    100%{ transform: scale(1); opacity: 1; }
}
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50%       { transform: scale(1.04); }
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50%       { transform: translateY(-8px); }
}
@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50%       { transform: translateY(-4px); }
}
@keyframes shake {
    0%,100% { transform: translateX(0); }
    25%     { transform: translateX(-4px); }
    75%     { transform: translateX(4px); }
}
@keyframes glowPulse {
    0%  { box-shadow: 0 0 0 0 var(--primary-glow); }
    70% { box-shadow: 0 0 0 10px transparent; }
    100%{ box-shadow: 0 0 0 0 transparent; }
}
@keyframes slideUp {
    from { opacity: 0; transform: translateX(-50%) translateY(20px); }
    to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}
@keyframes slideIn {
    from { transform: translateX(110%); opacity: 0; }
    to   { transform: translateX(0); opacity: 1; }
}
@keyframes wiggle {
    0%,100% { transform: rotate(0); }
    25%     { transform: rotate(-3deg); }
    75%     { transform: rotate(3deg); }
}
@keyframes shimmer {
    0%   { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}
@keyframes togglePulse {
    0%   { transform: translateX(0) scale(1); }
    50%  { transform: translateX(28px) scale(1.15); }
    100% { transform: translateX(28px) scale(1); }
}

.fixed-navbar {
    position: fixed;
    top: 0; left: 0; width: 100%;
    background: var(--navbar-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    padding: 0 2rem;
    height: 72px;
    display: flex;
    align-items: center;
    transition: background-color 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.fixed-navbar.scrolled { box-shadow: var(--shadow-md); }

.nav-container {
    max-width: 1400px;
    margin: 0 auto; width: 100%;
    display: flex; align-items: center; justify-content: space-between; gap: 2rem;
}

.nav-logo {
    display: flex; align-items: center; gap: 10px;
    text-decoration: none;
    font-family: var(--font-display);
    font-weight: 800; font-size: 1.2rem;
    color: var(--text);
    letter-spacing: -0.02em; white-space: nowrap;
}

.nav-logo-icon {
    width: 34px; height: 34px;
    background: var(--primary);
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.9rem; color: #0c0c0c; flex-shrink: 0;
    transition: transform 0.3s;
}

.nav-logo:hover .nav-logo-icon { transform: rotate(8deg) scale(1.08); }

.nav-logo > i {
    width: 34px; height: 34px;
    background: var(--primary);
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.9rem; color: #0c0c0c;
    transition: transform 0.3s;
}

.nav-logo:hover > i { transform: rotate(8deg) scale(1.08); }

.nav-menu {
    display: flex; list-style: none; gap: 0.25rem;
    margin: 0; padding: 0; align-items: center;
}

.nav-menu li a, .nav-link {
    text-decoration: none; color: var(--text-2);
    font-weight: 500; font-size: 0.9rem;
    padding: 7px 14px; border-radius: 8px;
    transition: all 0.2s; display: block;
}

.nav-menu li a:hover, .nav-link:hover { color: var(--text); background: var(--surface-2); }

.nav-right { display: flex; align-items: center; gap: 0.5rem; }

.dark-mode-toggle { position: relative; }

.dark-mode-toggle input {
    position: absolute; opacity: 0; width: 0; height: 0;
}

.toggle-label {
    display: flex; align-items: center;
    width: 56px; height: 28px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 100px; padding: 3px;
    cursor: pointer; position: relative;
    transition: all 0.3s;
}

.toggle-label .fa-sun  { color: #f59e0b; font-size: 11px; margin-left: 4px; z-index: 2; }
.toggle-label .fa-moon { color: #818cf8; font-size: 11px; margin-right: 4px; z-index: 2; margin-left: auto; }

.toggle-ball {
    position: absolute; left: 3px;
    width: 22px; height: 22px;
    background: var(--primary);
    border-radius: 50%;
    transition: transform 0.35s cubic-bezier(0.34,1.56,0.64,1);
    box-shadow: 0 1px 4px rgba(0,0,0,0.2);
    z-index: 3;
}

html.dark-mode .toggle-ball { transform: translateX(28px); }

.dark-mode-toggle input:checked ~ .toggle-label .toggle-ball,
.dark-mode-toggle input:checked + .toggle-label .toggle-ball { transform: translateX(28px); }

.dark-mode-toggle:hover .toggle-ball { transform: scale(1.1); }
html.dark-mode .dark-mode-toggle:hover .toggle-ball { transform: translateX(28px) scale(1.1); }
.dark-mode-toggle input:checked + .toggle-label:hover .toggle-ball { transform: translateX(28px) scale(1.1); }

.nav-toggle {
    display: none; font-size: 1.2rem; cursor: pointer;
    color: var(--text); padding: 6px 8px; border-radius: 8px;
    transition: background 0.2s; align-items: center;
}
.nav-toggle:hover { background: var(--surface-2); }

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 5rem;
    animation: fadeInUp 0.45s ease both;
}

.header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding: 2.5rem 1rem 0;
    position: relative;
}

.header::before {
    content: '';
    position: absolute;
    top: 0; left: 50%;
    transform: translateX(-50%);
    width: 500px; height: 260px;
    background: radial-gradient(ellipse at center, rgba(217,138,31,0.06) 0%, transparent 72%);
    pointer-events: none;
    z-index: 0;
}

.header-badge {
    display: inline-flex; align-items: center; gap: 6px;
    background: rgba(217,138,31,0.1);
    border: 1px solid rgba(217,138,31,0.3);
    color: #b07a1e;
    padding: 5px 14px; border-radius: 100px;
    font-size: 0.76rem; font-weight: 700;
    letter-spacing: 0.06em; text-transform: uppercase;
    margin-bottom: 1.25rem;
    animation: fadeIn 0.4s ease both;
    position: relative; z-index: 1;
}

html.dark-mode .header-badge { color: var(--primary); }

.header h1 {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 5vw, 3.6rem);
    font-weight: 800; line-height: 1.08;
    letter-spacing: -0.03em;
    color: var(--text);
    margin-bottom: 1rem;
    animation: fadeInUp 0.45s 0.05s ease both;
    position: relative; z-index: 1;
}

.header h1 span {
    background: var(--grad-brand);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-description {
    color: var(--text-2);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto 1.75rem;
    line-height: 1.7;
    animation: fadeInUp 0.45s 0.1s ease both;
    position: relative; z-index: 1;
}

.hero-badges {
    display: flex; gap: 0.6rem; justify-content: center;
    flex-wrap: wrap; margin-bottom: 2rem;
    animation: fadeInUp 0.45s 0.15s ease both;
    position: relative; z-index: 1;
}

.hero-pill {
    display: inline-flex; align-items: center; gap: 6px;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-2);
    padding: 5px 12px; border-radius: 100px;
    font-size: 0.78rem; font-weight: 500;
    transition: all 0.2s;
}

.hero-pill:hover { border-color: var(--primary); color: var(--text); }

.hero-pill i { font-size: 0.72rem; color: #b07a1e; }
html.dark-mode .hero-pill i { color: var(--primary); }

.tool-container {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-bottom: 1.25rem;
    position: relative;
    overflow: hidden;
    transition: background-color 0.25s, border-color 0.25s;
}

.tool-container::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 2px;
    background: var(--grad-brand);
    opacity: 0.6;
}

.upload-section {
    border: 2px dashed var(--border-strong);
    border-radius: var(--radius-lg);
    padding: 3.5rem 2rem;
    text-align: center;
    margin-bottom: 1.5rem;
    background: var(--surface-2);
    transition: all 0.25s ease;
    cursor: pointer;
}

.upload-section:hover, .upload-section.active {
    border-color: var(--primary);
    background: rgba(217,138,31,0.05);
}

body:not(.dark-mode) .upload-section:hover,
body:not(.dark-mode) .upload-section.active {
    border-color: #b07a1e;
}

.upload-section.active { transform: scale(1.005); }

.upload-icon {
    font-size: 3rem; display: block;
    color: #b07a1e; margin-bottom: 1rem;
    animation: float 3s ease-in-out infinite;
}

html.dark-mode .upload-icon { color: var(--primary); }

.upload-section:hover .upload-icon { animation: none; transform: scale(1.08); }

.drag-text {
    font-size: 1.05rem; font-weight: 600;
    color: var(--text); margin-bottom: 1rem;
}

.upload-btn {
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--primary); color: #0c0c0c;
    border: none; padding: 11px 24px; border-radius: 100px;
    font-size: 0.95rem; font-weight: 700; font-family: inherit;
    cursor: pointer; transition: all 0.2s;
    box-shadow: var(--shadow-primary);
    position: relative; overflow: hidden;
}

body:not(.dark-mode) .upload-btn { background: #12e07a; box-shadow: 0 6px 20px rgba(7,184,97,0.3); }

.upload-btn::after {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
    transform: translateX(-100%); transition: transform 0.5s;
}
.upload-btn:hover::after { transform: translateX(100%); }
.upload-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-primary); }
.upload-btn:active { transform: translateY(1px); }

.file-input { display: none; }

.file-counter {
    position: absolute; top: -8px; right: -8px;
    background: var(--danger); color: white;
    width: 22px; height: 22px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.72rem; font-weight: 700;
    animation: pulse 1.5s infinite;
}

.supported-formats {
    display: flex; flex-wrap: wrap;
    justify-content: center; gap: 5px; margin-top: 1.25rem;
}

.format-tag {
    background: var(--surface); border: 1px solid var(--border);
    color: var(--text-3); padding: 3px 9px; border-radius: 6px;
    font-size: 0.7rem; font-weight: 700; letter-spacing: 0.05em;
    transition: all 0.2s;
}

.format-tag:hover { border-color: var(--primary); color: var(--text); transform: translateY(-1px); }

.real-time-stats {
    display: flex; gap: 1rem;
    margin: 0 0 1.5rem;
    animation: slideInRight 0.4s ease both;
}

.real-time-stats .stat-item {
    flex: 1; display: flex; align-items: center; gap: 10px;
    padding: 1rem 1.25rem;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: 0.88rem; font-weight: 600;
    transition: background 0.2s, border-color 0.25s, transform 0.2s;
}

.real-time-stats .stat-item:last-child { border-right: none; }
.real-time-stats .stat-item:hover { background: var(--surface); transform: translateY(-2px); border-color: var(--border-strong); }

.real-time-stats .stat-item i {
    color: #b07a1e; font-size: 1.1rem; width: 22px; text-align: center;
    background: rgba(217,138,31,0.10); border-radius: 6px; padding: 5px;
}
html.dark-mode .real-time-stats .stat-item i { color: var(--primary); background: rgba(217,138,31,0.08); }

.options-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem; margin-bottom: 1.5rem;
}

@media (max-width: 900px) {
    .options-section { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
    .options-section { grid-template-columns: 1fr; }
}

.option-card {
    background: var(--surface-2); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 1.25rem 1.25rem 1.25rem 1.5rem;
    border-left: 3px solid var(--primary);
    transition: all 0.2s;
    animation: slideInLeft 0.4s ease both;
    display: flex;
    flex-direction: column;
}

.option-card .select-label { margin-bottom: 0.5rem; flex-shrink: 0; }
.option-card .format-select,
.option-card .rename-input,
.option-card input[type="range"] { flex-shrink: 0; }
.option-card .resize-container { flex-shrink: 0; }
.option-card .resize-dimensions { flex-shrink: 0; }

.option-card .quality-row {
    display: flex; justify-content: space-between;
    font-size: 0.74rem; color: var(--text-3); margin-top: 4px; flex-shrink: 0;
}
.option-card .hint { flex-shrink: 0; }

.option-card:nth-child(2) { animation-delay: 0.04s; }
.option-card:nth-child(3) { animation-delay: 0.08s; }
.option-card:nth-child(4) { animation-delay: 0.12s; }
.option-card:nth-child(5) { animation-delay: 0.16s; }
.option-card:nth-child(6) { animation-delay: 0.20s; }

.option-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--border-strong); border-left-color: var(--primary); }

.select-label {
    display: block; font-size: 0.76rem; font-weight: 700;
    letter-spacing: 0.07em; text-transform: uppercase;
    color: var(--text-3); margin-bottom: 0.55rem;
}

.format-select, .rename-input, .search-input, .imgsize-setting {
    width: 100%; padding: 9px 12px; border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface); color: var(--text);
    font-size: 0.9rem; font-family: inherit;
    transition: all 0.2s; appearance: none; -webkit-appearance: none;
}

.format-select {
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2'%3e%3cpolyline points='6 9 12 15 18 9'/%3e%3c/svg%3e");
    background-repeat: no-repeat; background-position: right 10px center;
    background-size: 1em; padding-right: 32px; cursor: pointer;
}

.format-select:focus, .rename-input:focus, .search-input:focus, .imgsize-setting:focus {
    outline: none; border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

body:not(.dark-mode) .format-select:focus,
body:not(.dark-mode) .rename-input:focus,
body:not(.dark-mode) .search-input:focus {
    border-color: #b07a1e;
    box-shadow: 0 0 0 3px rgba(7,184,97,0.15);
}

.hint { display: block; font-size: 0.74rem; color: var(--text-3); margin-top: 5px; }

.resize-container { display: flex; gap: 8px; align-items: center; }

.resize-container select {
    flex: 1; padding: 9px 32px 9px 12px; border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface); color: var(--text);
    font-family: inherit; appearance: none; -webkit-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2'%3e%3cpolyline points='6 9 12 15 18 9'/%3e%3c/svg%3e");
    background-repeat: no-repeat; background-position: right 10px center;
    background-size: 1em; cursor: pointer; font-size: 0.9rem;
}

.resize-container select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }

.resize-container input[type="number"] {
    flex: 0 0 88px; padding: 9px 12px; border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface); color: var(--text);
    font-family: inherit; font-size: 0.9rem; transition: all 0.2s;
}

.resize-container input[type="number"]:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }
.resize-container input[type="number"]:disabled { opacity: 0.35; cursor: not-allowed; }

.resize-dimensions { display: none; gap: 10px; margin-top: 8px; }
.resize-dimensions.visible { display: flex; }
.dimension-input { flex: 1; }
.dimension-input label { display: block; font-size: 0.74rem; color: var(--text-3); margin-bottom: 4px; font-weight: 600; }
.dimension-input input { width: 100%; }

input[type="range"] {
    width: 100%; height: 4px; border-radius: 100px;
    background: var(--border-strong); outline: none;
    -webkit-appearance: none; appearance: none; cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none; width: 18px; height: 18px;
    border-radius: 50%; background: var(--primary); cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15); transition: transform 0.15s;
}

input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }

.option-item input[type="range"] {
    width: 100%; height: 4px; border-radius: 100px;
    background: var(--border-strong); outline: none;
    -webkit-appearance: none; appearance: none; cursor: pointer;
}

.option-item input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none; width: 16px; height: 16px;
    border-radius: 50%; background: var(--primary); cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.15); transition: transform 0.15s;
}

.option-item input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }

.process-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 10px;
    width: 100%; padding: 14px 28px;
    background: var(--primary); color: #0c0c0c;
    border: none; border-radius: 100px;
    font-size: 1rem; font-weight: 700; font-family: inherit;
    cursor: pointer; margin-top: 1rem; transition: all 0.2s;
    box-shadow: var(--shadow-primary);
    position: relative; overflow: hidden; text-decoration: none;
}

body:not(.dark-mode) .process-btn { background: #12e07a; box-shadow: 0 6px 20px rgba(7,184,97,0.3); }

.process-btn::after {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transform: translateX(-100%); transition: transform 0.6s;
}
.process-btn:hover::after { transform: translateX(100%); }
.process-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-primary); }
.process-btn:active { transform: translateY(0); }

.process-btn:disabled {
    background: var(--border-strong); color: var(--text-3);
    cursor: not-allowed; transform: none; box-shadow: none; animation: none;
}

.spinner { animation: spin 1s linear infinite; }

.advanced-options {
    display: none; margin-top: 1.5rem; padding: 1.5rem;
    background: var(--surface-2);
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius-lg);
}

.advanced-options.visible { display: block; animation: bounceIn 0.35s ease both; }

.advanced-title {
    display: flex; align-items: center;
    justify-content: space-between; margin-bottom: 1.25rem; cursor: pointer;
}

.advanced-title h3 {
    font-size: 0.8rem; font-weight: 800;
    letter-spacing: 0.07em; text-transform: uppercase;
    color: #b07a1e; display: flex; align-items: center; gap: 8px;
}

html.dark-mode .advanced-title h3 { color: var(--primary); }

.toggle-advanced {
    background: none; border: none; color: var(--text-3);
    font-size: 1rem; cursor: pointer; transition: transform 0.3s; padding: 4px;
}
.toggle-advanced:hover { transform: rotate(180deg); color: var(--text); }

.option-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
}

.option-item {
    display: flex; flex-direction: column; gap: 6px;
    background: var(--surface-2); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 1.25rem;
    transition: all 0.2s;
}

.option-item label {
    font-size: 0.76rem; font-weight: 700;
    letter-spacing: 0.07em; text-transform: uppercase;
    color: var(--text-3);
}

.option-item select, .option-item input[type="number"] {
    padding: 9px 12px; border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface); color: var(--text);
    font-size: 0.88rem; font-family: inherit; transition: all 0.2s;
    appearance: none; -webkit-appearance: none;
}

.option-item select:focus, .option-item input[type="number"]:focus {
    outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow);
}

.toggle-switch {
    position: relative; display: inline-block; width: 44px; height: 22px;
}
.toggle-switch input { opacity: 0; width: 0; height: 0; }

.slider {
    position: absolute; cursor: pointer; inset: 0;
    background: var(--border-strong); border-radius: 100px; transition: 0.3s;
}

.slider::before {
    content: ''; position: absolute;
    width: 16px; height: 16px; left: 3px; bottom: 3px;
    background: white; border-radius: 50%; transition: 0.3s;
}

input:checked + .slider { background: var(--primary); }
input:checked + .slider::before { transform: translateX(22px); }

.search-container { position: relative; width: 100%; }
.search-input { padding-left: 40px; }
.search-icon {
    position: absolute; left: 13px; top: 50%;
    transform: translateY(-50%); color: var(--text-3);
    font-size: 0.82rem; pointer-events: none;
}

.table-wrapper {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-top: 1.25rem;

    isolation: isolate;
    transform: translateZ(0);
}

.images-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    display: none;
    animation: fadeInUp 0.35s ease both;
}

.images-table.visible { display: table; }

.images-table thead tr { background: var(--surface-2); }

.images-table th {
    padding: 10px 14px; text-align: left;
    font-size: 0.72rem; font-weight: 800;
    letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-3);
    border-bottom: 1px solid var(--border);
}

.images-table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle; font-size: 0.88rem;
    background: var(--surface);
    transition: background 0.15s;
}

.images-table tr:last-child td { border-bottom: none; }
.images-table tr:last-child td:first-child { border-bottom-left-radius: var(--radius-lg); }
.images-table tr:last-child td:last-child  { border-bottom-right-radius: var(--radius-lg); }

.images-table thead tr th:first-child { border-top-left-radius: calc(var(--radius-lg) - 1px); }
.images-table thead tr th:last-child  { border-top-right-radius: calc(var(--radius-lg) - 1px); }

.images-table tbody tr:hover td { background: var(--surface-2); }

.thumbnail {
    width: 52px; height: 52px; object-fit: cover;
    border-radius: 9px; border: 1px solid var(--border);
    transition: all 0.2s; cursor: pointer;
}

.thumbnail:hover { transform: scale(1.08); box-shadow: var(--shadow-md); }
.thumbnail.processing { opacity: 0.55; filter: grayscale(0.4); }

.file-info { display: flex; flex-direction: column; gap: 2px; }

.file-name {
    font-weight: 600; max-width: 210px;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: 0.86rem;
}

.file-size { font-size: 0.76rem; color: var(--text-3); }

.progress-container {
    background: var(--surface-2); border-radius: 100px;
    height: 5px; overflow: hidden; margin-bottom: 4px;
}

.progress-bar {
    height: 100%; background: var(--grad-brand);
    border-radius: 100px; width: 0%; transition: width 0.3s;
}

.status {
    font-size: 0.78rem; color: var(--text-3);
    display: flex; align-items: center; gap: 5px; font-weight: 600;
}

.status.completed { color: var(--success); animation: bounce 0.4s ease; }
.status.processing { color: var(--info); }
.status.error { color: var(--danger); animation: shake 0.3s ease; }

.action-btn {
    width: 30px; height: 30px;
    border: 1px solid var(--border); background: var(--surface);
    border-radius: 8px; cursor: pointer; font-size: 0.8rem;
    display: inline-flex; align-items: center; justify-content: center;
    transition: all 0.2s; color: var(--text-2);
}

.delete-btn:hover { background: rgba(255,77,109,0.1); border-color: var(--danger); color: var(--danger); }
.download-btn:hover { background: rgba(217,138,31,0.1); border-color: var(--primary); color: #b07a1e; }
.enhance-btn:hover { background: rgba(21,97,109,0.1); border-color: var(--accent); color: var(--accent); }

.batch-actions {
    display: none; justify-content: space-between; align-items: center;
    gap: 0.75rem; margin-top: 1.25rem; flex-wrap: wrap;
    animation: fadeInUp 0.35s ease both;
}

.batch-actions.visible { display: flex; }
.batch-right-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.batch-btn {
    display: inline-flex; align-items: center; gap: 7px;
    padding: 8px 18px; border-radius: 100px;
    font-weight: 700; font-size: 0.86rem; font-family: inherit;
    cursor: pointer; transition: all 0.2s; border: 1px solid transparent;
}

.batch-btn:hover { transform: translateY(-1px); }
.batch-btn:active { transform: translateY(0); }

.download-all-btn { background: var(--primary); color: #0c0c0c; }
body:not(.dark-mode) .download-all-btn { background: #12e07a; }
.download-all-btn:hover { box-shadow: var(--shadow-primary); }

.share-all-btn { background: var(--accent); color: white; }
.share-all-btn:hover { box-shadow: 0 6px 18px rgba(21,97,109,0.3); }

.save-preset-btn { background: linear-gradient(135deg, #ff4d6d, #ff9a3c); color: white; }

.clear-all-btn {
    background: transparent; color: var(--danger); border-color: var(--danger);
}
.clear-all-btn:hover { background: rgba(255,77,109,0.08); }

.no-files td { text-align: center; padding: 2.5rem; color: var(--text-3); }

.preview-container { display: none; margin-top: 1.5rem; animation: fadeInUp 0.35s ease both; }
.preview-container.visible { display: block; }

.preview-title {
    font-family: var(--font-display);
    font-size: 1rem; font-weight: 700; color: var(--text);
    display: flex; align-items: center; gap: 8px; margin-bottom: 1rem;
}

.preview-title i { color: #b07a1e; }
html.dark-mode .preview-title i { color: var(--primary); }

.preview-comparison {
    display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1rem;
}

.preview-box { text-align: center; }
.preview-box img {
    max-width: 100%; border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md); margin-bottom: 0.4rem;
    transition: transform 0.2s;
}
.preview-box img:hover { transform: scale(1.02); }
.preview-label { font-size: 0.78rem; color: var(--text-3); font-weight: 600; }

.stats-container {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 1px; background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg); overflow: hidden;
}

.stats-container .stat-item {
    background: var(--surface-2); padding: 1rem; text-align: center;
}

.stat-value {
    font-family: var(--font-display);
    font-size: 1.6rem; font-weight: 800;
    color: #b07a1e; display: block;
}
html.dark-mode .stat-value { color: var(--primary); }

.stat-label {
    font-size: 0.72rem; color: var(--text-3); font-weight: 600;
    margin-top: 2px; display: block; letter-spacing: 0.04em; text-transform: uppercase;
}

.watermark-preview {
    display: none; margin-top: 1rem; padding: 1rem;
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.watermark-preview.visible { display: block; animation: fadeInUp 0.3s ease both; }
.watermark-preview-image { max-width: 100%; border-radius: 8px; margin-top: 8px; }

.features-section { margin: 2rem 0; }
.features-container { max-width: 1400px; margin: 0 auto; }

.section-title { text-align: center; margin-bottom: 2rem; }

.section-title h2 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 800; color: var(--text);
    letter-spacing: -0.02em; margin-bottom: 0.5rem;
}

.section-title p { color: var(--text-2); font-size: 0.95rem; max-width: 540px; margin: 0 auto; }

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

@media (max-width: 900px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
    .features-grid { grid-template-columns: 1fr; }
}

.feature-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-xl); padding: 1.75rem;
    transition: all 0.25s; position: relative; overflow: hidden;
}

.feature-card::before {
    content: ''; position: absolute;
    top: 0; left: 0; right: 0; height: 3px;
    opacity: 0; transition: opacity 0.3s;
}
.feature-card--speed::before   { background: linear-gradient(90deg, #d98a1f, #2f8f9c); }
.feature-card--privacy::before { background: linear-gradient(90deg, #15616d, #d98a1f); }
.feature-card--controls::before{ background: linear-gradient(90deg, #ffb547, #ff6b35); }
.feature-card--batch::before   { background: linear-gradient(90deg, #d98a1f, #15616d); }
.feature-card--enhance::before { background: linear-gradient(90deg, #ff6b35, #ffb547); }
.feature-card--formats::before { background: linear-gradient(90deg, #2f8f9c, #d98a1f); }
.feature-card:hover::before { opacity: 1; }

.feature-card::after {
    content: ''; position: absolute;
    bottom: -40px; right: -40px;
    width: 110px; height: 110px;
    border-radius: 50%; transition: all 0.4s; opacity: 0.07;
}
.feature-card--speed::after   { background: #d98a1f; }
.feature-card--privacy::after { background: #15616d; }
.feature-card--controls::after{ background: #ffb547; }
.feature-card--batch::after   { background: #d98a1f; }
.feature-card--enhance::after { background: #ff6b35; }
.feature-card--formats::after { background: #2f8f9c; }
.feature-card:hover::after { transform: scale(2.4); opacity: 0.1; }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(217,138,31,0.3); }
body:not(.dark-mode) .feature-card:hover { border-color: rgba(7,184,97,0.25); }

.feature-icon {
    width: 44px; height: 44px;
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem;
    margin-bottom: 1rem; transition: transform 0.2s; position: relative; z-index: 1;
}
.feature-card--speed   .feature-icon { background: linear-gradient(135deg,rgba(217,138,31,0.2),rgba(0,212,255,0.15)); color: #d98a1f; }
.feature-card--privacy .feature-icon { background: linear-gradient(135deg,rgba(21,97,109,0.2),rgba(217,138,31,0.1)); color: #15616d; }
.feature-card--controls .feature-icon{ background: linear-gradient(135deg,rgba(255,181,71,0.2),rgba(255,107,53,0.1)); color: #ffb547; }
.feature-card--batch   .feature-icon { background: linear-gradient(135deg,rgba(217,138,31,0.2),rgba(21,97,109,0.1)); color: #d98a1f; }
.feature-card--enhance .feature-icon { background: linear-gradient(135deg,rgba(255,107,53,0.2),rgba(255,181,71,0.1)); color: #ff6b35; }
.feature-card--formats .feature-icon { background: linear-gradient(135deg,rgba(0,212,255,0.2),rgba(217,138,31,0.1)); color: #2f8f9c; }
html.dark-mode .feature-icon { filter: brightness(1.15); }
.feature-card:hover .feature-icon { transform: scale(1.1) rotate(5deg); }

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.05rem; font-weight: 700;
    color: var(--text); margin-bottom: 0.4rem;
    position: relative; z-index: 1;
}

.feature-card p { font-size: 0.86rem; color: var(--text-2); line-height: 1.65; position: relative; z-index: 1; }

.testimonials-section { margin: 2rem 0; }
.testimonials-container { max-width: 1400px; margin: 0 auto; }
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
@media (max-width: 992px) { .testimonials-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .testimonials-grid { grid-template-columns: 1fr; } }

.testimonial-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-xl); padding: 1.75rem;
    display: flex; flex-direction: column; transition: all 0.25s;
    position: relative; overflow: hidden;
}

.testimonial-accent {
    position: absolute; top: 0; left: 0; right: 0; height: 3px;
}
.testimonial-card--a .testimonial-accent { background: linear-gradient(90deg, #d98a1f, #2f8f9c); }
.testimonial-card--b .testimonial-accent { background: linear-gradient(90deg, #15616d, #d98a1f); }
.testimonial-card--c .testimonial-accent { background: linear-gradient(90deg, #ffb547, #ff6b35); }

.testimonial-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.testimonial-card--a:hover { border-color: rgba(217,138,31,0.3); }
.testimonial-card--b:hover { border-color: rgba(21,97,109,0.3); }
.testimonial-card--c:hover { border-color: rgba(255,181,71,0.3); }

.testimonial-quote {
    font-size: 0.92rem; line-height: 1.75; color: var(--text-2);
    flex: 1; margin-bottom: 1.25rem; position: relative; padding-top: 1.25rem;
}

.testimonial-quote::before {
    content: '"';
    font-family: var(--font-display);
    font-size: 4.5rem; line-height: 0;
    position: absolute; top: 0.7rem; left: -2px; opacity: 0.25;
}
.testimonial-card--a .testimonial-quote::before { color: #d98a1f; }
.testimonial-card--b .testimonial-quote::before { color: #15616d; }
.testimonial-card--c .testimonial-quote::before { color: #ffb547; }

.testimonial-author {
    display: flex; align-items: center; gap: 12px;
    padding-top: 1rem; border-top: 1px solid var(--border);
}

.author-avatar {
    width: 42px; height: 42px; border-radius: 50%;
    object-fit: cover;
}
.testimonial-card--a .author-avatar { border: 2px solid var(--primary); }
.testimonial-card--b .author-avatar { border: 2px solid var(--accent); }
.testimonial-card--c .author-avatar { border: 2px solid var(--primary-strong); }

.author-info h4 { font-size: 0.88rem; font-weight: 700; color: var(--text); margin-bottom: 1px; }
.author-info p { font-size: 0.76rem; color: var(--text-3); }
.rating { display: flex; gap: 2px; margin-top: 3px; }
.rating i { font-size: 0.68rem; color: var(--warning); }

.stats-section-new { margin: 2rem 0; }

.stats-container-new {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem;
}

@media (max-width: 900px) { .stats-container-new { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px)  { .stats-container-new { grid-template-columns: 1fr 1fr; gap: 0.75rem; } }

.stat-card-new {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius-xl); padding: 1.75rem 1.25rem;
    text-align: center; transition: all 0.25s; position: relative; overflow: hidden;
}

.stat-card-new::before {
    content: ''; position: absolute;
    top: 0; left: 0; right: 0; height: 2px;
    background: var(--grad-brand); opacity: 0; transition: opacity 0.25s;
}
.stat-card-new:hover::before { opacity: 1; }
.stat-card-new:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(217,138,31,0.25); }

.stat-icon-new { font-size: 1.4rem; color: #b07a1e; margin-bottom: 0.75rem; display: block; }
html.dark-mode .stat-icon-new { color: var(--primary); }

.stat-number-new {
    font-family: var(--font-display);
    font-size: 2rem; font-weight: 800; color: var(--text);
    letter-spacing: -0.02em; display: block; margin-bottom: 0.25rem;
}

.stat-label-new {
    font-size: 0.76rem; font-weight: 800;
    letter-spacing: 0.07em; text-transform: uppercase;
    color: var(--text-2); display: block; margin-bottom: 0.2rem;
}

.stat-desc-new { font-size: 0.74rem; color: var(--text-3); display: block; }

.limit-notice {
    display: none; position: fixed;
    top: 88px; right: 20px;
    background: var(--danger); color: white;
    padding: 14px 18px; border-radius: var(--radius-lg);
    box-shadow: 0 8px 24px rgba(255,77,109,0.35);
    z-index: 1100; animation: slideIn 0.3s ease both;
    max-width: 300px; font-size: 0.88rem;
}

.limit-notice.visible { display: block; }

.close-notice {
    position: absolute; top: 6px; right: 8px;
    background: none; border: none; color: white;
    cursor: pointer; font-size: 0.82rem; opacity: 0.7; padding: 2px;
}
.close-notice:hover { opacity: 1; }

.privacy-notice {
    position: fixed; bottom: 24px; left: 50%;
    transform: translateX(-50%);
    background: var(--surface); border: 1px solid var(--border);
    border-left: 3px solid #b07a1e;
    padding: 1.25rem 1.5rem; border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    max-width: 90%; width: 480px; z-index: 1100; display: none;
    transition: background-color 0.25s, border-color 0.25s;
}

html.dark-mode .privacy-notice { border-left-color: var(--primary); }
.privacy-notice.visible { display: block; animation: slideUp 0.4s ease both; }
.privacy-notice-content { position: relative; }

.close-privacy-notice {
    position: absolute; top: -8px; right: -8px;
    background: var(--surface-2); border: 1px solid var(--border);
    border-radius: 50%; width: 28px; height: 28px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; color: var(--text-2); font-size: 0.78rem;
    transition: all 0.2s;
}
.close-privacy-notice:hover { transform: scale(1.1) rotate(90deg); }

.privacy-notice h3 { font-size: 0.95rem; font-weight: 700; color: var(--text); margin-bottom: 0.4rem; }
.privacy-notice p { font-size: 0.83rem; color: var(--text-2); margin-bottom: 8px; line-height: 1.55; }
.privacy-notice-actions { display: flex; gap: 8px; margin-top: 12px; }

.privacy-btn {
    padding: 7px 16px; border: none; border-radius: 100px;
    cursor: pointer; font-weight: 700; font-size: 0.83rem; font-family: inherit; transition: all 0.2s;
}

.privacy-accept { background: var(--primary); color: #0c0c0c; }
body:not(.dark-mode) .privacy-accept { background: #12e07a; }
.privacy-accept:hover { transform: translateY(-1px); }

.privacy-learn-more { background: transparent; color: var(--text-2); border: 1px solid var(--border); }
.privacy-learn-more:hover { background: var(--surface-2); }

.toast {
    position: fixed; bottom: 24px; right: 24px;
    background: var(--surface); border: 1px solid var(--border);
    color: var(--text); padding: 11px 18px;
    border-radius: 100px; box-shadow: var(--shadow-lg);
    z-index: 1200; display: flex; align-items: center; gap: 8px;
    font-size: 0.86rem; font-weight: 600;
    transform: translateY(80px); opacity: 0;
    transition: all 0.3s cubic-bezier(0.34,1.56,0.64,1);
    max-width: 320px;
}

.toast.visible { transform: translateY(0); opacity: 1; }
.toast.success { border-left: 3px solid var(--success); }
.toast.success i { color: var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.error i { color: var(--danger); }
.toast.info { border-left: 3px solid var(--info); }
.toast.info i { color: var(--info); }

.explanation-box {
    background: rgba(217,138,31,0.07); border-left: 3px solid #b07a1e;
    padding: 0.85rem 1rem; border-radius: 0 var(--radius) var(--radius) 0; margin-top: 0.75rem;
}
html.dark-mode .explanation-box { background: rgba(217,138,31,0.05); border-left-color: var(--primary); }
.explanation-box i { color: #b07a1e; margin-right: 6px; }
html.dark-mode .explanation-box i { color: var(--primary); }
.explanation-box p { font-size: 0.83rem; color: var(--text-2); margin: 0; line-height: 1.6; }

.option-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1rem; }

.faq-item {
    border: 1px solid var(--border); border-radius: var(--radius-lg);
    margin-bottom: 0.6rem; overflow: hidden;
    background: var(--surface); transition: all 0.2s;
}

.faq-question {
    padding: 1rem 1.25rem; cursor: pointer;
    display: flex; align-items: center; justify-content: space-between;
    font-weight: 600; font-size: 0.92rem; color: var(--text);
    transition: background 0.2s;
}

.faq-question:hover { background: var(--surface-2); }

.faq-question::after {
    content: '+'; font-size: 1.3rem; color: #b07a1e;
    font-weight: 300; transition: transform 0.3s; line-height: 1; flex-shrink: 0;
}
html.dark-mode .faq-question::after { color: var(--primary); }

.faq-item.open .faq-question::after { transform: rotate(45deg); }

.faq-answer {
    display: none; padding: 0 1.25rem 1rem;
    font-size: 0.88rem; color: var(--text-2); line-height: 1.7;
    border-top: 1px solid var(--border);
}

.faq-item.open .faq-answer { display: block; animation: fadeIn 0.2s ease both; }

.stats-section { display: none; }
.stat-number { font-family: var(--font-display); font-size: 2rem; font-weight: 800; color: var(--text); }

@media (max-width: 992px) {
    .header h1 { font-size: 2.2rem; }
    .features-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
}

@media (max-width: 768px) {
    .fixed-navbar { padding: 0 1.25rem; height: 64px; }
    body { padding-top: 64px; }
    .nav-toggle { display: flex; }

    .nav-menu {
        position: fixed; top: 64px; left: -100%;
        width: 100%; height: calc(100vh - 64px);
        background: var(--navbar-bg);
        backdrop-filter: blur(20px);
        flex-direction: column; align-items: center;
        justify-content: center; gap: 2rem; z-index: 999;
        transition: left 0.3s ease; border-top: 1px solid var(--border);
    }
    .nav-menu.active { left: 0; }
    .nav-menu li a { font-size: 1.1rem; padding: 10px 24px; }

    .options-section { grid-template-columns: 1fr; }
    .batch-actions { flex-direction: column; align-items: stretch; }
    .batch-right-actions { flex-direction: column; }
    .batch-btn { justify-content: center; }
    .container { padding: 1.5rem 1rem 3rem; }
    .header { padding: 1.5rem 0 0; }
    .real-time-stats { flex-direction: column; gap: 0.5rem; }
    .real-time-stats .stat-item { border-right: none; }
    .features-grid { grid-template-columns: 1fr; }
    .privacy-notice { padding: 1rem; }
    .privacy-notice-actions { flex-direction: column; }
    .privacy-btn { width: 100%; text-align: center; }
    .preview-comparison { grid-template-columns: 1fr; }
    .images-table.visible { display: block !important; overflow-x: auto; }
    .images-table thead { display: none; }
    .images-table tr { display: block; margin-bottom: 12px; border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; }
    .images-table td { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; border-bottom: 1px solid var(--border); }
    .images-table td::before { content: attr(data-label); font-weight: 700; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-3); }
    .images-table td:last-child { border-bottom: none; }
}

@media (max-width: 480px) {
    .header h1 { font-size: 1.8rem; }
    .hero-description { font-size: 0.92rem; }
    .tool-container { padding: 1.25rem; }
}

.scroll-top-btn {
    position: fixed;
    bottom: 28px; right: 28px;
    width: 42px; height: 42px;
    background: var(--primary);
    color: #0c0c0c;
    border: none; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem; cursor: pointer;
    box-shadow: var(--shadow-primary);
    opacity: 0; transform: translateY(16px) scale(0.85);
    transition: all 0.3s cubic-bezier(0.34,1.56,0.64,1);
    z-index: 900; pointer-events: none;
}
html:not(.dark-mode) .scroll-top-btn { background: #12e07a; }
.scroll-top-btn.visible { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.scroll-top-btn:hover { transform: translateY(-3px) scale(1.08); }

.nav-menu li a.active-page {
    color: var(--text);
    background: var(--surface-2);
    font-weight: 700;
    position: relative;
}
html.dark-mode .nav-menu li a.active-page { background: var(--surface-2); }

.kbd-hint {
    display: inline-flex; align-items: center; gap: 4px;
    margin-top: 0.75rem; font-size: 0.72rem; color: var(--text-3);
}
.kbd {
    background: var(--surface); border: 1px solid var(--border-strong);
    border-radius: 5px; padding: 1px 6px;
    font-family: 'Courier New', monospace; font-size: 0.7rem;
    box-shadow: 0 2px 0 var(--border-strong);
    color: var(--text-2);
}

.file-name { cursor: pointer; }
.file-name:hover { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
html:not(.dark-mode) .file-name:hover { color: #b07a1e; }

.images-table tbody tr { cursor: grab; transition: opacity 0.2s; }
.images-table tbody tr.dragging { opacity: 0.4; cursor: grabbing; }
.images-table tbody tr.drag-over td { border-top: 2px solid var(--primary); }

:root { --tracking-eyebrow: 0.14em; }

body { font-family: var(--font-body); letter-spacing: -0.002em; }

h1, h2, h3, h4,
.header h1, .preview-title, .feature-card h3, .section-title h2 {
    font-family: var(--font-display);
    font-feature-settings: "ss01" on;
}
.header h1, .blog-hero h1, .tips-hero h1 { letter-spacing: -0.035em; font-weight: 800; }

.format-tag,
.real-time-stats .stat-item,
.stat-label,
.kbd, .kbd-tip,
.header-badge,
.blog-hero-badge,
.tips-hero-badge,
.featured-tag,
.tip-number,
.blog-cat, .tip-badge,
.section-eyebrow,
.format-name {
    font-family: var(--font-mono);
    font-feature-settings: "zero" on;
}
.stat-value { font-family: var(--font-mono); letter-spacing: -0.01em; }
.header-badge, .blog-hero-badge, .tips-hero-badge,
.featured-tag, .blog-cat, .tip-badge, .section-eyebrow {
    letter-spacing: var(--tracking-eyebrow);
}

.header-badge, .blog-hero-badge, .tips-hero-badge {
    border-radius: 6px;
    background: var(--primary-dim);
    border: 1px solid var(--border-strong);
    color: var(--primary-strong);
}
html.dark-mode .header-badge,
html.dark-mode .blog-hero-badge,
html.dark-mode .tips-hero-badge { color: var(--primary); }

.upload-btn, .process-btn, .tips-cta-btn, .article-cta-btn {
    color: #211603;
    letter-spacing: 0.01em;
    font-family: var(--font-body);
}

.nav-logo span { font-family: var(--font-display); font-weight: 800; letter-spacing: -0.02em; }

a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, [tabindex]:focus-visible, .tip-card:focus-visible,
.blog-card:focus-visible, .featured-article:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}

.upload-btn,
.process-btn,
.download-all-btn,
.privacy-accept,
.scroll-top-btn,
.share-all-btn,
.batch-btn.download-all-btn { color: var(--on-primary); }
.real-time-stats .stat-item span,
.select-label { color: inherit; }

body:not(.dark-mode) .upload-btn,
body:not(.dark-mode) .process-btn,
body:not(.dark-mode) .download-all-btn,
body:not(.dark-mode) .privacy-accept,
html:not(.dark-mode) .scroll-top-btn {
    background: var(--primary);
    box-shadow: var(--shadow-primary);
    color: var(--on-primary);
}
body:not(.dark-mode) .upload-section:hover,
body:not(.dark-mode) .upload-section.active { border-color: var(--primary); }
.upload-section:hover, .upload-section.active { background: var(--primary-dim); }
body:not(.dark-mode) .feature-card:hover { border-color: var(--primary-dim); }
body:not(.dark-mode) .format-select:focus,
body:not(.dark-mode) .rename-input:focus,
body:not(.dark-mode) .search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-dim);
}
.upload-icon,
html.dark-mode .upload-icon,
.hero-pill i,
html.dark-mode .hero-pill i { color: var(--primary); }

.header-badge,
.hero-pill,
.format-tag,
.select-label,
.real-time-stats .stat-item {
    font-family: var(--font-mono);
    letter-spacing: 0.02em;
}
.header-badge {
    background: transparent;
    border: 1px solid var(--border-strong);
    border-radius: 4px;
    color: var(--text-2);
    font-weight: 500;
    padding: 5px 12px 5px 10px;
}
.header-badge::before {
    content: '';
    display: inline-block;
    width: 7px; height: 7px;
    margin-right: 2px;
    background: var(--accent);
    border-radius: 1px;
}
html.dark-mode .header-badge { color: var(--text-2); }

.hero-pill { border-radius: 4px; font-weight: 500; }
.hero-pill:hover { border-color: var(--primary); color: var(--text); background: var(--surface-2); }

.format-tag {
    border-radius: 3px;
    text-transform: uppercase;
    font-size: 0.68rem;
    letter-spacing: 0.05em;
}

.header h1 { letter-spacing: -0.04em; }
.header h1 span {
    -webkit-background-clip: border-box;
    background-clip: border-box;
    background: none;
    color: var(--primary);
    -webkit-text-fill-color: currentColor;
    padding-bottom: 2px;
    box-shadow: inset 0 -0.14em 0 var(--accent-soft);
}

.header::before {
    width: min(640px, 90%); height: auto; top: auto; bottom: -10px;
    border-bottom: 1px solid var(--border);
    background: none;
    opacity: 0.9;
}

.upload-btn, .process-btn, .download-all-btn,
.share-all-btn, .clear-all-btn, .privacy-accept, .privacy-learn-more {
    border-radius: var(--radius);
    font-family: var(--font-display);
    letter-spacing: -0.01em;
}
.upload-btn::after { display: none; }

.tool-container::before { background: var(--primary); opacity: 1; height: 3px; }
.tool-container {
    border-color: var(--border-strong);
}

.option-card { border-radius: var(--radius-lg); }
.real-time-stats .stat-item { border-radius: var(--radius); }

.nav-logo { letter-spacing: -0.02em; }
.nav-menu li a, .nav-link { font-weight: 500; letter-spacing: 0.005em; }
.nav-link.active-page { color: var(--text); background: var(--surface-2); }
.nav-link.active-page::after {
    content: ''; display: block; height: 2px; margin-top: 2px;
    background: var(--accent); border-radius: 2px;
}

.rating i, .testimonial-accent { color: var(--accent); }
.testimonial-accent { background: var(--accent); }

a:focus-visible, button:focus-visible,
input:focus-visible, select:focus-visible, .filter-tab:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}

.feature-card--speed::before,
.feature-card--controls::before,
.feature-card--formats::before { background: var(--grad-brand); }
.feature-card--privacy::before,
.feature-card--batch::before,
.feature-card--enhance::before { background: linear-gradient(90deg, var(--accent), var(--primary)); }

.feature-card--speed::after,
.feature-card--controls::after,
.feature-card--formats::after,
.feature-card--batch::after  { background: var(--primary); }
.feature-card--privacy::after,
.feature-card--enhance::after { background: var(--accent); }

.feature-card:hover { border-color: var(--primary); }
body:not(.dark-mode) .feature-card:hover { border-color: var(--primary); }

.feature-card--speed   .feature-icon,
.feature-card--batch   .feature-icon,
.feature-card--formats .feature-icon { background: rgba(35,71,197,0.12); color: var(--primary); }
.feature-card--privacy .feature-icon,
.feature-card--controls .feature-icon,
.feature-card--enhance .feature-icon { background: rgba(192,132,28,0.14); color: var(--accent); }
html.dark-mode .feature-card--speed   .feature-icon,
html.dark-mode .feature-card--batch   .feature-icon,
html.dark-mode .feature-card--formats .feature-icon { background: rgba(110,139,245,0.16); color: var(--primary); }
html.dark-mode .feature-card--privacy .feature-icon,
html.dark-mode .feature-card--controls .feature-icon,
html.dark-mode .feature-card--enhance .feature-icon { background: rgba(224,169,75,0.16); color: var(--accent); }

.testimonial-card--a .testimonial-quote::before,
.testimonial-card--c .testimonial-quote::before { color: var(--primary); }
.testimonial-card--b .testimonial-quote::before { color: var(--accent); }
.testimonial-card--a .testimonial-accent { background: var(--primary); }
.testimonial-card--b .testimonial-accent { background: var(--accent); }
.testimonial-card--c .testimonial-accent { background: var(--primary-strong); }

.upload-text-sub, .file-size-info { color: var(--text-2); }

.site-footer { border-top: 1px solid var(--border); margin-top: 4rem; padding: 2rem 0; }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.5rem; justify-content: space-between; }
.footer-brand { display: flex; align-items: center; gap: 8px; font-family: var(--font-display); font-weight: 600; color: var(--text); }
.footer-brand i { color: var(--primary); }
.footer-links { display: flex; flex-wrap: wrap; gap: 1.1rem; }
.footer-links a { color: var(--text-2); text-decoration: none; font-size: 0.9rem; }
.footer-links a:hover { color: var(--primary); }
.footer-copy { color: var(--text-3); font-size: 0.82rem; width: 100%; margin: 0; }
.ad-slot { margin: 2rem auto; text-align: center; min-height: 90px; }