/* ── AudioConverter – Glassmorphism Design ── */

/* ── Reset & Base ── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #0a0a0f;
    --surface: rgba(26, 26, 36, 0.55);
    --surface-hover: rgba(34, 34, 47, 0.7);
    --surface-alt: rgba(34, 34, 47, 0.75);
    --border: rgba(66, 66, 88, 0.25);
    --border-light: rgba(108, 92, 231, 0.2);
    --text: #e8e8ef;
    --text-secondary: #c4c4dd;
    --text-dim: #8888aa;
    --primary: #6c5ce7;
    --primary-hover: #7c6df7;
    --primary-glow: rgba(108, 92, 231, 0.35);
    --success: #00b894;
    --success-glow: rgba(0, 184, 148, 0.3);
    --error: #e17055;
    --error-bg: rgba(225, 112, 85, 0.1);
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
    overflow-x: hidden;
    position: relative;
}

/* ── Aurora Canvas ── */
#auroraCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* ── Aurora Noise Overlay ── */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(ellipse 80% 60% at 50% -20%, rgba(108, 92, 231, 0.06), transparent),
        radial-gradient(ellipse 60% 50% at 80% 80%, rgba(0, 184, 148, 0.03), transparent),
        radial-gradient(ellipse 50% 60% at 20% 90%, rgba(162, 155, 254, 0.04), transparent);
    pointer-events: none;
}

/* ── Container ── */
.container {
    max-width: 540px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
    z-index: 1;
}

/* ── Header ── */
header {
    text-align: center;
    padding: 2.5rem 0 0.25rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.logo-icon {
    font-size: 2.2rem;
    filter: drop-shadow(0 0 12px var(--primary-glow));
}

h1 {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, #a29bfe 50%, #c4b5fd 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-dim);
    font-size: 0.92rem;
    line-height: 1.5;
    max-width: 400px;
    margin: 0 auto;
}

/* ── Card Base (Glassmorphism) ── */
.glass,
.glass-card {
    background: var(--surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

/* ── Drop Zone ── */
.drop-zone {
    cursor: pointer;
    text-align: center;
    padding: 3rem 2rem;
    border: 2px dashed var(--border);
    background: var(--surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.drop-zone::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: var(--radius);
    background: linear-gradient(135deg, var(--primary), transparent, var(--primary));
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 0;
    animation: borderRotate 3s linear infinite;
    background-size: 200% 200%;
}

@keyframes borderRotate {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.drop-zone:hover::before,
.drop-zone.drag-over::before {
    opacity: 0.5;
}

.drop-zone-content {
    position: relative;
    z-index: 1;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.35), 0 0 60px var(--primary-glow);
}

.drop-zone.drag-over {
    transform: scale(1.02);
}

.drop-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    display: inline-block;
    transition: transform 0.3s ease;
}

.drop-zone:hover .drop-icon {
    transform: scale(1.1) rotate(-5deg);
}

.drop-zone.drag-over .drop-icon {
    transform: scale(1.15) rotate(0deg);
    animation: float 1.5s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1.15); }
    50% { transform: translateY(-8px) scale(1.15); }
}

.drop-text {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.drop-text strong {
    color: var(--primary-hover);
    font-weight: 700;
}

.drop-hint {
    color: var(--text-dim);
    font-size: 0.82rem;
    line-height: 1.4;
}

/* ── Settings Card ── */
.settings-card {
}

.file-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.9rem 1rem;
    background: var(--surface-alt);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
}

.file-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
}

.file-details {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-weight: 600;
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-size {
    color: var(--text-dim);
    font-size: 0.8rem;
    display: block;
    margin-top: 0.1rem;
}

.btn-change {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-dim);
    cursor: pointer;
    border-radius: 50%;
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    transition: all 0.25s ease;
    flex-shrink: 0;
}

.btn-change:hover {
    border-color: var(--error);
    color: var(--error);
    background: var(--error-bg);
    transform: rotate(90deg);
}

.settings-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.setting-group {
    flex: 1;
}

.setting-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-bottom: 0.4rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.setting-group select {
    width: 100%;
    padding: 0.7rem 0.8rem;
    padding-right: 2rem;
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.88rem;
    cursor: pointer;
    transition: all 0.25s ease;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238888aa' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.7rem center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.setting-group select:hover {
    border-color: var(--border-light);
}

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

/* ── Convert Button ── */
.btn-convert {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary), #8b7cf7, #a29bfe);
    background-size: 200% 200%;
    border: none;
    border-radius: var(--radius-sm);
    color: #fff;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    position: relative;
    overflow: hidden;
}

.btn-convert::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(255,255,255,0.08) 50%, transparent 100%);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.btn-convert:hover::after {
    transform: translateX(100%);
}

.btn-convert:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--primary-glow);
    background-position: 100% 100%;
}

.btn-convert:active:not(:disabled) {
    transform: translateY(0);
}

.btn-convert:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-convert.loading {
    pointer-events: none;
}

.btn-icon {
    font-size: 1.2rem;
}

/* ── Progress ── */
.progress-card {
    text-align: center;
}

.progress-status {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.progress-bar-track {
    height: 6px;
    background: var(--surface-alt);
    border-radius: 99px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.progress-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), #a29bfe, var(--success));
    background-size: 200% 100%;
    border-radius: 99px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    animation: progressPulse 1.5s ease-in-out infinite;
}

@keyframes progressPulse {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.progress-percent {
    margin-top: 0.6rem;
    font-size: 0.82rem;
    color: var(--text-dim);
    font-variant-numeric: tabular-nums;
    font-weight: 600;
}

/* ── Result ── */
.result-card {
    text-align: center;
    border-color: rgba(0, 184, 148, 0.2);
}

.result-icon {
    font-size: 3rem;
    margin-bottom: 0.8rem;
    display: inline-block;
    animation: resultPop 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes resultPop {
    0% { transform: scale(0); }
    50% { transform: scale(1.3); }
    100% { transform: scale(1); }
}

.result-text h3 {
    font-size: 1.2rem;
    margin-bottom: 0.3rem;
    color: var(--success);
}

.result-details {
    color: var(--text-dim);
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.btn-download {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--success), #00d2a0);
    border: none;
    border-radius: var(--radius-sm);
    color: #fff;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--success-glow);
}

.btn-download:active {
    transform: translateY(0);
}

.btn-convert-new {
    width: 100%;
    padding: 0.8rem;
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-dim);
    font-size: 0.92rem;
    cursor: pointer;
    transition: all 0.25s ease;
    margin-top: 0.75rem;
}

.btn-convert-new:hover {
    border-color: var(--primary);
    color: var(--text);
    background: var(--surface-hover);
}

/* ── Error ── */
.error-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    border-color: rgba(225, 112, 85, 0.3);
    background: rgba(225, 112, 85, 0.06);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.error-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
}

.error-text {
    flex: 1;
    font-size: 0.9rem;
    color: var(--error);
    line-height: 1.4;
}

.error-card .btn-change {
    flex-shrink: 0;
}

.error-card .btn-change:hover {
    border-color: var(--error);
    color: var(--error);
    background: var(--error-bg);
    transform: none;
}

/* ── Supported Formats ── */
.formats-card {
    padding: 1.25rem 1.5rem;
}

.formats-card h3 {
    font-size: 0.78rem;
    color: var(--text-dim);
    margin-bottom: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

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

.format-badge {
    padding: 0.3rem 0.7rem;
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 99px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-dim);
    letter-spacing: 0.03em;
    transition: all 0.25s ease;
}

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

/* ── Footer ── */
footer {
    text-align: center;
    padding: 0.25rem 0 3rem;
}

footer p {
    font-size: 0.78rem;
    color: var(--text-dim);
    line-height: 1.5;
    max-width: 360px;
    margin: 0 auto;
}

/* ── GSAP Animation States ── */
.gsap-hidden {
    opacity: 0;
    visibility: hidden;
}

/* ── Responsive ── */
@media (max-width: 600px) {
    body { padding: 1rem 0.75rem; }
    .container { gap: 1rem; }
    header { padding: 1.5rem 0 0; }
    h1 { font-size: 1.6rem; }
    .logo-icon { font-size: 1.8rem; }
    .drop-zone { padding: 2rem 1.25rem; }
    .drop-icon { font-size: 2.8rem; }
    .glass-card, .drop-zone { padding: 1.25rem; }
    .settings-row { flex-direction: column; gap: 0.75rem; }
    .error-card { flex-wrap: wrap; }
    .formats-card { padding: 1rem 1.15rem; }
    .file-info { padding: 0.75rem; }
}

/* ── Dark Scrollbar ── */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg);
}
::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 99px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-dim);
}