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

:root {
    --canvas: #090909;
    --surface-1: #141414;
    --surface-2: #1c1c1c;
    --hairline: #262626;
    --ink: #ffffff;
    --ink-muted: #999999;
    --accent: #0099ff;
    --gradient-1: #6a4cf5;
    --gradient-2: #d44df0;
    --gradient-3: #0099ff;
    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;
    --rounded-sm: 6px;
    --rounded-md: 10px;
    --rounded-lg: 15px;
    --rounded-xl: 20px;
    --rounded-pill: 100px;
}

html { font-size: 16px; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--canvas);
    color: var(--ink);
    min-height: 100vh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 32px;
    border-bottom: 1px solid var(--hairline);
    background: var(--canvas);
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(12px);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--ink);
}

.header-badge {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--ink-muted);
    background: var(--surface-1);
    padding: 5px 12px;
    border-radius: var(--rounded-pill);
    border: 1px solid var(--hairline);
}

/* Main */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 60px 20px;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
}

/* Hero */
.hero { text-align: center; margin-bottom: 48px; }

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -2.2px;
    margin-bottom: 16px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-2), var(--gradient-1), var(--gradient-3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    font-size: 17px;
    color: var(--ink-muted);
    max-width: 460px;
    margin: 0 auto;
    line-height: 1.5;
}

/* Upload Zone */
.upload-zone { width: 100%; }

.upload-box {
    border: 2px dashed var(--hairline);
    border-radius: var(--rounded-xl);
    padding: 56px 32px;
    text-align: center;
    cursor: pointer;
    transition: all 0.25s ease;
    background: var(--surface-1);
}

.upload-box:hover, .upload-box.drag-over {
    border-color: var(--accent);
    background: var(--surface-2);
}

.upload-box.drag-over { 
    box-shadow: 0 0 0 4px rgba(0, 153, 255, 0.1);
}

.upload-icon {
    color: var(--ink-muted);
    margin-bottom: 20px;
    display: inline-flex;
    transition: color 0.25s;
}

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

.upload-label {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 8px;
    letter-spacing: -0.3px;
}

.upload-label .link {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.upload-hint {
    font-size: 13px;
    color: var(--ink-muted);
}

/* Status Card */
.status-card {
    background: var(--surface-1);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-xl);
    padding: 24px;
}

.status-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent);
    animation: pulse-dot 1.2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 0.4; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1); }
}

.status-text {
    font-size: 15px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.2px;
}

.status-filename {
    font-size: 13px;
    color: var(--ink-muted);
    margin-top: 8px;
}

.progress-bar-track {
    height: 4px;
    background: var(--surface-2);
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--gradient-3), var(--gradient-1), var(--gradient-2));
    border-radius: 2px;
    width: 0%;
    transition: width 0.4s ease;
}

/* Result Card */
.result-card {
    background: var(--surface-1);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-xl);
    overflow: hidden;
}

.result-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    border-bottom: 1px solid var(--hairline);
}

.result-header h3 {
    flex: 1;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.btn-copy, .btn-download {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 600;
    padding: 7px 14px;
    border-radius: var(--rounded-pill);
    border: 1px solid var(--hairline);
    cursor: pointer;
    transition: all 0.2s;
    background: var(--surface-2);
    color: var(--ink);
}

.btn-copy:hover, .btn-download:hover {
    background: var(--hairline);
    border-color: var(--ink-muted);
}

.btn-download {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.btn-download:hover {
    background: #0080dd;
    border-color: #0080dd;
}

.result-text {
    padding: 24px;
    font-size: 14px;
    line-height: 1.7;
    color: var(--ink);
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 500px;
    overflow-y: auto;
}

.result-text::-webkit-scrollbar { width: 6px; }
.result-text::-webkit-scrollbar-track { background: transparent; }
.result-text::-webkit-scrollbar-thumb { background: var(--hairline); border-radius: 3px; }

/* Error Card */
.error-card {
    background: var(--surface-1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--rounded-xl);
    padding: 32px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.error-icon { color: var(--error); }

.error-text {
    font-size: 15px;
    color: var(--ink);
    font-weight: 500;
}

.btn-retry {
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 600;
    padding: 10px 20px;
    border-radius: var(--rounded-pill);
    border: 1px solid var(--hairline);
    cursor: pointer;
    background: var(--surface-2);
    color: var(--ink);
    margin-top: 8px;
    transition: all 0.2s;
}

.btn-retry:hover {
    background: var(--hairline);
}

/* Footer */
.footer {
    text-align: center;
    padding: 24px;
    font-size: 12px;
    color: var(--ink-muted);
    border-top: 1px solid var(--hairline);
}

.footer strong { color: var(--ink); }

/* Toast */
.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--surface-2);
    color: var(--ink);
    padding: 10px 22px;
    border-radius: var(--rounded-pill);
    font-size: 13px;
    font-weight: 600;
    border: 1px solid var(--hairline);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 100;
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Responsive */
@media (max-width: 600px) {
    .header { padding: 14px 20px; }
    .main { padding: 40px 16px; }
    .hero-title { font-size: 36px; letter-spacing: -1.4px; }
    .hero-sub { font-size: 15px; }
    .upload-box { padding: 40px 20px; }
    .upload-label { font-size: 16px; }
    .result-header { flex-wrap: wrap; gap: 8px; }
    .result-text { padding: 16px; font-size: 13px; }
}