/* ============================================
   Image Compressor — Styles
   Theme: Dark mode with Neon Lime palette
   ============================================ */

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

:root {
    --primary: #84CC16;
    --primary-hover: #9AE62B;
    --secondary: #A3E635;
    --accent: #8B5CF6;
    --accent-hover: #A78BFA;
    --bg: #0A1A0A;
    --bg-card: rgba(15, 30, 15, 0.7);
    --bg-card-hover: rgba(25, 45, 25, 0.8);
    --bg-input: rgba(20, 40, 20, 0.6);
    --border: rgba(132, 204, 22, 0.2);
    --border-hover: rgba(132, 204, 22, 0.4);
    --text: #E8F0E8;
    --text-muted: #98B898;
    --text-dim: #688068;
    --danger: #EF4444;
    --success: #22C55E;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-xs: 6px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --transition: 250ms ease;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --glass: blur(12px);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.hidden {
    display: none !important;
}

/* --- Header --- */
.app-header {
    background: linear-gradient(135deg, rgba(132, 204, 22, 0.12), rgba(139, 92, 246, 0.06));
    border-bottom: 1px solid var(--border);
    backdrop-filter: var(--glass);
    padding: 1.5rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tagline {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* --- Main --- */
.app-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* --- Upload Zone --- */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 3.5rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    background: var(--bg-card);
    backdrop-filter: var(--glass);
    position: relative;
}

.upload-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(132, 204, 22, 0.06), transparent 70%);
    pointer-events: none;
}

.upload-zone:hover,
.upload-zone:focus-visible,
.upload-zone.drag-over {
    border-color: var(--primary);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-md), 0 0 30px rgba(132, 204, 22, 0.1);
    transform: translateY(-2px);
}

.upload-zone:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.upload-icon {
    margin-bottom: 1rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-6px);
    }
}

.upload-zone h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.upload-zone p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* --- Controls --- */
.controls-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    backdrop-filter: var(--glass);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.control-row {
    display: flex;
    gap: 1.25rem;
    align-items: flex-end;
    flex-wrap: wrap;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    flex: 1;
    min-width: 140px;
}

.control-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.slider-wrap {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 6px;
    background: rgba(132, 204, 22, 0.15);
    border-radius: 999px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(132, 204, 22, 0.4);
    transition: transform 150ms ease;
}

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

.slider-value {
    font-weight: 700;
    color: var(--primary);
    font-size: 0.95rem;
    min-width: 40px;
    text-align: right;
}

.select-control,
.input-control {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
    font-family: var(--font);
    transition: all var(--transition);
}

.select-control:focus,
.input-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(132, 204, 22, 0.15);
}

.input-control::placeholder {
    color: var(--text-dim);
}

.control-checkbox {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    min-width: auto;
}

.control-checkbox label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.85rem;
    text-transform: none;
    letter-spacing: normal;
}

.control-checkbox input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
    cursor: pointer;
}

.control-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.55rem 1rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-family: var(--font);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #0A1A0A;
    font-weight: 600;
    box-shadow: 0 2px 10px rgba(132, 204, 22, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 4px 16px rgba(132, 204, 22, 0.5);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-input);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--border-hover);
    color: var(--text);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    background: rgba(132, 204, 22, 0.08);
    border-color: var(--primary);
}

.btn-ghost {
    background: transparent;
    color: var(--text-dim);
}

.btn-ghost:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

.btn-icon {
    background: transparent;
    color: var(--text-muted);
    padding: 0.4rem;
    border-radius: var(--radius-xs);
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

.btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.btn-sm {
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
}

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

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    text-align: center;
    backdrop-filter: var(--glass);
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    display: block;
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
}

.stat-value.accent {
    color: var(--accent);
}

.stat-value.saved {
    color: var(--success);
}

/* --- Image Cards --- */
.images-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

.image-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all var(--transition);
    animation: fadeUp 400ms ease both;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.image-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
}

.image-preview {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
    background: rgba(0, 0, 0, 0.3);
}

.image-info {
    padding: 0.75rem 1rem;
}

.image-name {
    font-weight: 600;
    font-size: 0.85rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.25rem;
}

.image-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.image-sizes {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
}

.original-size {
    color: var(--text-dim);
    text-decoration: line-through;
}

.compressed-size {
    color: var(--primary);
    font-weight: 600;
}

.reduction-badge {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success);
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.image-actions {
    display: flex;
    gap: 0.5rem;
    padding: 0 1rem 0.75rem;
}

.progress-bar {
    height: 3px;
    background: rgba(132, 204, 22, 0.1);
    border-radius: 999px;
    overflow: hidden;
    margin: 0.5rem 0 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 999px;
    transition: width 300ms ease;
    width: 0;
}

/* --- Comparison Modal --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 2rem;
}

.modal-content {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: 1.5rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.modal-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

.compare-container {
    position: relative;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border);
}

.compare-before,
.compare-after {
    position: relative;
}

.compare-before img,
.compare-after img {
    width: 100%;
    display: block;
    max-height: 500px;
    object-fit: contain;
    background: #111;
}

.compare-after {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.compare-label {
    position: absolute;
    top: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-xs);
    background: rgba(0, 0, 0, 0.7);
    color: var(--text);
    font-size: 0.75rem;
    font-weight: 600;
}

.compare-before .compare-label {
    left: 0.75rem;
}

.compare-after .compare-label {
    right: 0.75rem;
}

.compare-slider {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    z-index: 10;
}

.compare-stats {
    margin-top: 1rem;
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.compare-stats strong {
    color: var(--text);
}

/* --- Footer --- */
.app-footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-dim);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
    margin-top: 2rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .app-header {
        padding: 1rem;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }

    .app-main {
        padding: 1rem;
    }

    .upload-zone {
        padding: 2rem 1rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .images-grid {
        grid-template-columns: 1fr;
    }

    .control-row {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
}