/* --- CSS Variables --- */
:root {
    --bg: #faf9f7;
    --bg-elevated: #ffffff;
    --card: #ffffff;
    --border: #e5e3df;
    --border-hover: #d4d1cb;
    --fg: #1a1817;
    --muted: #6b6560;
    --accent: #8b5cf6; /* Purple for Converter */
    --accent-light: #f3e8ff;
    --accent-glow: rgba(139, 92, 246, 0.15);
    --secondary: #06b6d4;
    --success: #10b981;
    --danger: #ef4444;
    --input-bg: #ffffff;
    --pattern-opacity: 0.3;
}

[data-theme="dark"] {
    --bg: #0a0a0f;
    --bg-elevated: #12121a;
    --card: #16161f;
    --border: #2a2a3a;
    --border-hover: #3a3a4a;
    --fg: #e8e8ed;
    --muted: #6b6b7a;
    --accent: #a78bfa;
    --accent-light: #a78bfa20;
    --accent-glow: rgba(167, 139, 250, 0.2);
    --secondary: #22d3ee;
    --success: #34d399;
    --danger: #f87171;
    --input-bg: #0f0f14;
    --pattern-opacity: 0.05;
}

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

body {
    font-family: 'Space Grotesk', sans-serif;
    background-color: var(--bg);
    color: var(--fg);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* --- Background --- */
.bg-decoration {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.bg-pattern {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, var(--muted) 1px, transparent 1px);
    background-size: 24px 24px;
    opacity: var(--pattern-opacity);
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #ddd6fe, #c4b5fd);
    top: -150px;
    right: -100px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #a5f3fc, #67e8f9);
    bottom: -100px;
    left: -100px;
    animation-delay: -5s;
}

[data-theme="dark"] .orb-1 { background: var(--accent); opacity: 0.15; }
[data-theme="dark"] .orb-2 { background: var(--secondary); opacity: 0.15; }

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, 20px) scale(1.05); }
}

/* --- Layout --- */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* --- Header --- */
header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.header-top {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 50px;
    border: 1px solid var(--border);
    background: var(--card);
    font-size: 14px;
    color: var(--muted);
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
    animation: pulse 2s infinite;
}

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

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 0.5rem;
}

h1 span { color: var(--accent); }

.subtitle {
    color: var(--muted);
    font-size: 1.1rem;
}

/* --- Theme Toggle --- */
.theme-toggle {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 100;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--card);
    border: 2px solid var(--border);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.theme-toggle:hover {
    transform: rotate(15deg) scale(1.1);
    border-color: var(--accent);
    background: var(--accent-light);
}

.theme-toggle svg {
    width: 24px;
    height: 24px;
    stroke: var(--fg);
    fill: none;
    stroke-width: 2;
}

/* --- Upload Zone --- */
.upload-wrapper {
    margin-bottom: 1.5rem;
}

.upload-zone {
    background: var(--card);
    border: 2px dashed var(--border);
    border-radius: 20px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 24px rgba(0,0,0,0.03);
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--accent);
    background: var(--accent-light);
    transform: translateY(-2px);
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    color: var(--muted);
    transition: color 0.3s;
}

.upload-zone:hover .upload-icon { color: var(--accent); }

.upload-icon svg { width: 100%; height: 100%; stroke: currentColor; fill: none; }

.upload-zone h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }
.upload-zone p { color: var(--muted); font-size: 0.9rem; margin-bottom: 1rem; }

.upload-formats {
    display: flex;
    justify-content: center;
    gap: 8px;
}

.upload-formats span {
    background: var(--bg);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    color: var(--muted);
}

/* --- Toolbar --- */
.toolbar {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    box-shadow: 0 4px 16px rgba(0,0,0,0.03);
    position: sticky;
    top: 20px;
    z-index: 10;
}

.toolbar-left, .toolbar-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.file-count { font-weight: 600; font-family: 'JetBrains Mono', monospace; }
.divider { width: 1px; height: 24px; background: var(--border); }
.toolbar-left label { font-size: 0.9rem; color: var(--muted); }

.toolbar-left select {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 12px;
    font-weight: 600;
    cursor: pointer;
    color: var(--fg);
}

/* --- Buttons --- */
.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}
.btn-primary svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 2; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 4px 12px var(--accent-glow); }

.btn-success {
    background: var(--success);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-success:hover { transform: translateY(-2px); filter: brightness(1.1); }
.btn-success.hidden { display: none; }

.btn-ghost {
    background: transparent;
    color: var(--fg);
    border: 1px solid var(--border);
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.btn-icon {
    background: var(--bg);
    border: 1px solid var(--border);
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--muted);
}
.btn-icon svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 2; }
.btn-icon:hover { background: var(--danger); border-color: var(--danger); color: white; }

/* --- Image List --- */
.image-list {
    display: grid;
    gap: 1rem;
}

/* --- Image Card --- */
.image-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    transition: all 0.3s ease;
}

.image-card:hover {
    box-shadow: 0 8px 30px rgba(0,0,0,0.06);
}

/* File Header */
.file-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}

.file-info { display: flex; flex-direction: column; gap: 4px; }
.file-name { font-weight: 600; }

.file-badges { display: flex; gap: 6px; }
.badge {
    background: var(--card);
    border: 1px solid var(--border);
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-family: 'JetBrains Mono', monospace;
    color: var(--muted);
}

.btn-remove {
    background: transparent;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    transition: all 0.2s;
}
.btn-remove svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 2; }
.btn-remove:hover { background: var(--danger); color: white; }

/* Previews */
.card-top {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--border);
}

.preview-box {
    background: var(--card);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 200px;
}

.preview-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--muted);
    margin-bottom: 1rem;
}

.preview-img {
    max-width: 100%;
    max-height: 140px;
    object-fit: contain;
    border-radius: 8px;
}

.preview-placeholder {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    opacity: 0.5;
}
.preview-placeholder svg { width: 40px; height: 40px; margin-bottom: 8px; stroke: currentColor; fill: none; stroke-width: 1.5; }

/* Result Banner */
.result-banner {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px;
    background: var(--success);
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
}
.result-banner.show { display: flex; }
.result-banner.warning { background: var(--accent); }
.result-banner svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 2; }

/* Settings Panel */
.settings-panel {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
}

.settings-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.setting-group { display: flex; flex-direction: column; gap: 6px; }
.setting-group label { font-size: 0.85rem; font-weight: 600; color: var(--muted); }

.setting-group select, .setting-group input {
    width: 100%;
    padding: 10px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--fg);
    font-family: inherit;
    transition: border-color 0.2s;
}
.setting-group select:focus, .setting-group input:focus { outline: none; border-color: var(--accent); }

/* Quality Slider */
.quality-wrap { display: flex; align-items: center; gap: 10px; }
.quality-slider {
    flex: 1;
    -webkit-appearance: none;
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(to right, var(--danger), var(--accent), var(--success));
}
.quality-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: white;
    border: 2px solid var(--accent);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
.quality-badge {
    background: var(--accent-light);
    color: var(--accent);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    min-width: 40px;
    text-align: center;
}

/* Size Inputs */
.size-inputs { display: flex; align-items: center; gap: 8px; }
.size-inputs input { width: 70px; text-align: center; }
.size-inputs span { color: var(--muted); }

/* Card Actions */
.card-actions {
    display: flex;
    gap: 10px;
    padding: 0 1.5rem 1.5rem;
}

.btn-convert {
    flex: 1;
    background: var(--accent);
    color: white;
    border: none;
    padding: 12px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s;
}
.btn-convert svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 2; }
.btn-convert:hover { filter: brightness(1.1); }
.btn-convert.done { background: var(--success); }

.btn-download {
    background: var(--bg);
    color: var(--fg);
    border: 1px solid var(--border);
    padding: 12px 20px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    display: none;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}
.btn-download.show { display: flex; }
.btn-download:hover { border-color: var(--accent); color: var(--accent); }
.btn-download svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 2; }

/* Spinner */
.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Toast --- */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--card);
    border: 1px solid var(--accent);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 1000;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast svg { width: 20px; height: 20px; stroke: var(--accent); fill: none; stroke-width: 2.5; }

/* Utility */
.hidden { display: none !important; }
.fade-in { animation: fadeIn 0.6s ease forwards; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* Responsive */
@media (max-width: 768px) {
    .toolbar { flex-direction: column; align-items: stretch; }
    .toolbar-left, .toolbar-right { justify-content: center; }
    .card-top { grid-template-columns: 1fr; }
    .preview-box { min-height: 150px; }
}