:root {
    --bg-white: #ffffff;
    --bg-slate-50: #f8fafc;
    --bg-slate-100: #f1f5f9;
    --bg-slate-200: #e2e8f0;
    --bg-slate-300: #cbd5e1;
    --bg-slate-400: #94a3b8;
    --bg-slate-500: #64748b;
    --bg-slate-700: #334155;
    --bg-slate-900: #0f172a;
    --blue-600: #2563eb;
    --blue-700: #1d4ed8;
    --blue-50: #eff6ff;
    --blue-100: #dbeafe;
    --blue-200: #bfdbfe;
    --blue-300: #93c5fd;
    --blue-400: #60a5fa;
    --emerald-500: #10b981;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-white);
    color: var(--bg-slate-900);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.min-h-screen { min-height: 100vh; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.hidden { display: none !important; }

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1rem;
    width: 100%;
}

/* Header */
.header {
    width: 100%;
    border-bottom: 1px solid var(--bg-slate-100);
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 40;
}

.header-content {
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.logo-icon {
    width: 2rem;
    height: 2rem;
    background-color: var(--blue-600);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 900;
    font-size: 1.25rem;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 900;
    letter-spacing: -0.025em;
}

.text-blue { color: var(--blue-600); }

.badge {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--bg-slate-400);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Ads */
.ad-container {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 1rem 0;
    background-color: rgba(248, 250, 252, 0.5);
}

.ad-placeholder {
    background-color: var(--bg-white);
    border: 1px solid var(--bg-slate-200);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-slate-400);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    text-align: center;
}

.top-banner {
    width: 100%;
    max-width: 728px;
    height: 90px;
}

.skyscraper {
    width: 100%;
    height: 100%;
    background-color: var(--bg-slate-200);
    border-color: var(--bg-slate-300);
    color: var(--bg-slate-500);
    font-size: 10px;
    font-weight: 700;
    padding: 1rem;
}

.rectangle-ad {
    width: 100%;
    height: 250px;
    background-color: var(--bg-slate-50);
    border-color: var(--bg-slate-100);
}

.sidebar-ad-placeholder {
    display: none;
    width: 100%;
    height: 600px;
    background-color: var(--bg-slate-50);
    border-top: 1px solid var(--bg-slate-100);
    align-items: center;
    justify-content: center;
    color: var(--bg-slate-400);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-top: auto;
}

@media (min-width: 1024px) {
    .sidebar-ad-placeholder { display: flex; }
}

/* Main Layout */
.main-content {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    width: 100%;
    padding: 0 1rem;
    gap: 1rem;
}

.skyscraper-ad {
    display: none;
    width: 160px;
    height: 600px;
    position: sticky;
    top: 6rem;
    margin-top: 2rem;
    flex-shrink: 0;
}

@media (min-width: 1024px) {
    .skyscraper-ad { display: block; }
}

.tool-wrapper {
    flex: 1;
    max-width: 1280px;
    width: 100%;
    min-width: 0;
    padding: 2rem 0;
}

.tool-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 1024px) {
    .tool-grid {
        grid-template-columns: repeat(10, 1fr);
    }
    .upload-section { grid-column: span 6; }
    .controls-section { grid-column: span 4; }
}

/* Tool Components */
.drop-zone {
    position: relative;
    aspect-ratio: 16 / 9;
    width: 100%;
    border-radius: 1rem;
    border: 2px dashed var(--bg-slate-300);
    background-color: var(--bg-slate-50);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: all 0.2s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.drop-zone:hover {
    border-color: var(--blue-400);
    background-color: rgba(239, 246, 255, 0.3);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.drop-zone.active {
    border-color: var(--blue-200);
}

.upload-prompt {
    text-align: center;
    padding: 2rem;
}

.upload-icon-wrap {
    width: 4rem;
    height: 4rem;
    background-color: var(--blue-100);
    color: var(--blue-600);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    transition: transform 0.2s;
}

.drop-zone:hover .upload-icon-wrap {
    transform: scale(1.1);
}

.upload-prompt h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--bg-slate-700);
    margin-bottom: 0.5rem;
}

.upload-prompt p {
    color: var(--bg-slate-500);
}

.preview-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

#image-preview {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 0.5rem;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.preview-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.drop-zone:hover .preview-overlay {
    background-color: rgba(0, 0, 0, 0.05);
}

.overlay-badge {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(4px);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--bg-slate-500);
    opacity: 0;
    transition: opacity 0.2s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.drop-zone:hover .overlay-badge {
    opacity: 1;
}

.rectangle-ad {
    margin-top: 1.5rem;
}

/* Controls Card */
.card {
    background-color: var(--bg-white);
    border-radius: 1rem;
    border: 1px solid var(--bg-slate-200);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 500px;
}

.tabs {
    display: flex;
    border-bottom: 1px solid var(--bg-slate-100);
    background-color: rgba(248, 250, 252, 0.5);
    position: relative;
}

.tab-btn {
    flex: 1;
    padding: 1rem 0;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: capitalize;
    border: none;
    background: none;
    cursor: pointer;
    color: var(--bg-slate-500);
    transition: all 0.2s;
}

.tab-btn:hover {
    color: var(--bg-slate-700);
    background-color: rgba(241, 245, 249, 0.5);
}

.tab-btn.active {
    color: var(--blue-600);
}

.tab-indicator {
    position: absolute;
    bottom: 0;
    height: 2px;
    background-color: var(--blue-600);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab-content {
    padding: 1.5rem;
    flex: 1;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--bg-slate-700);
    margin-bottom: 1rem;
}

.small-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--bg-slate-400);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

/* Convert Tab */
.format-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.format-btn {
    padding: 0.75rem 0;
    border-radius: 0.75rem;
    font-size: 0.75rem;
    font-weight: 700;
    border: 1px solid var(--bg-slate-200);
    background-color: var(--bg-white);
    color: var(--bg-slate-600);
    cursor: pointer;
    transition: all 0.2s;
}

.format-btn:hover {
    border-color: var(--blue-300);
}

.format-btn.active {
    background-color: var(--blue-600);
    border-color: var(--blue-600);
    color: white;
    box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.2);
}

/* Resize Tab */
.input-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.input-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    border: 1px solid var(--bg-slate-200);
    font-size: 0.875rem;
    font-weight: 500;
    outline: none;
    transition: all 0.2s;
}

.input-group input:focus {
    border-color: var(--blue-600);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    background-color: var(--bg-slate-50);
    border-radius: 0.75rem;
    margin-bottom: 1.5rem;
}

.toggle-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--bg-slate-600);
}

.toggle-btn {
    width: 3rem;
    height: 1.5rem;
    border-radius: 9999px;
    background-color: var(--bg-slate-300);
    border: none;
    position: relative;
    cursor: pointer;
    transition: all 0.2s;
}

.toggle-btn.active {
    background-color: var(--blue-600);
}

.toggle-dot {
    position: absolute;
    top: 0.25rem;
    left: 0.25rem;
    width: 1rem;
    height: 1rem;
    background-color: white;
    border-radius: 50%;
    transition: all 0.2s;
}

.toggle-btn.active .toggle-dot {
    left: 1.75rem;
}

.presets-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.preset-btn {
    padding: 0.375rem 0.75rem;
    border-radius: 0.5rem;
    border: 1px solid var(--bg-slate-200);
    background-color: var(--bg-white);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--bg-slate-600);
    cursor: pointer;
    transition: all 0.2s;
}

.preset-btn:hover {
    border-color: var(--blue-400);
    color: var(--blue-600);
}

/* Compress Tab */
.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 1rem;
}

.quality-display {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--blue-600);
}

.slider {
    width: 100%;
    height: 0.5rem;
    background-color: var(--bg-slate-100);
    border-radius: 0.5rem;
    appearance: none;
    cursor: pointer;
    margin-bottom: 0.5rem;
}

.slider::-webkit-slider-thumb {
    appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    background-color: var(--blue-600);
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 10px;
    font-weight: 700;
    color: var(--bg-slate-400);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Card Footer */
.card-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--bg-slate-100);
    background-color: rgba(248, 250, 252, 0.3);
}

.primary-btn {
    width: 100%;
    padding: 1rem 0;
    border-radius: 1rem;
    font-weight: 700;
    color: white;
    background-color: var(--blue-600);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s;
    box-shadow: 0 4px 6px rgba(37, 99, 235, 0.2);
}

.primary-btn:hover:not(:disabled) {
    background-color: var(--blue-700);
}

.primary-btn:disabled {
    background-color: var(--bg-slate-300);
    cursor: not-allowed;
    box-shadow: none;
}

.primary-btn:active:not(:disabled) {
    transform: scale(0.98);
}

/* Processing */
.progress-bar-wrap {
    width: 100%;
    height: 0.5rem;
    background-color: var(--bg-slate-200);
    border-radius: 9999px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress-bar {
    height: 100%;
    background-color: var(--blue-600);
    width: 0%;
    transition: width 0.1s linear;
}

.processing-text {
    text-align: center;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--bg-slate-500);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Results */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.stat-card {
    padding: 0.75rem;
    background-color: var(--bg-white);
    border-radius: 0.75rem;
    border: 1px solid var(--bg-slate-100);
}

.stat-card.optimized {
    background-color: var(--blue-50);
    border-color: var(--blue-100);
}

.stat-label {
    font-size: 10px;
    font-weight: 700;
    color: var(--bg-slate-400);
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.stat-card.optimized .stat-label {
    color: var(--blue-400);
}

.stat-value {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--bg-slate-700);
}

.stat-card.optimized .stat-value {
    color: var(--blue-700);
}

.reduction {
    margin-left: 0.5rem;
    font-size: 10px;
    color: var(--emerald-500);
}

.result-actions {
    display: flex;
    gap: 0.75rem;
}

.download-btn {
    flex: 1;
    background-color: var(--blue-600);
    color: white;
    padding: 1rem 0;
    border-radius: 1rem;
    font-weight: 700;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: 0 4px 6px rgba(37, 99, 235, 0.2);
    transition: all 0.2s;
}

.download-btn:hover {
    background-color: var(--blue-700);
}

.download-btn:active {
    transform: scale(0.98);
}

.reset-btn {
    padding: 0 1.5rem;
    background-color: var(--bg-white);
    border: 1px solid var(--bg-slate-200);
    color: var(--bg-slate-600);
    border-radius: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.reset-btn:hover {
    background-color: var(--bg-slate-50);
}

/* Footer */
.footer {
    background-color: var(--bg-slate-50);
    border-top: 1px solid var(--bg-slate-200);
    padding: 3rem 0;
    padding-bottom: 6rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.footer-col h4 {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--bg-slate-900);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.footer-col p {
    font-size: 0.875rem;
    color: var(--bg-slate-500);
    line-height: 1.6;
}

.footer-seo {
    margin-bottom: 3rem;
}

.footer-seo h2 {
    color: var(--bg-slate-900);
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-seo p {
    color: var(--bg-slate-500);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--bg-slate-200);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

.copyright {
    font-size: 0.75rem;
    color: var(--bg-slate-400);
    font-weight: 500;
}

.footer-badges {
    display: flex;
    gap: 1.5rem;
}

.footer-badges span {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--bg-slate-400);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Sticky Bottom */
.sticky-bottom {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4rem;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
    border-top: 1px solid var(--bg-slate-200);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
}

.sticky-text {
    color: var(--bg-slate-400);
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}