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

:root {
    --bg: #0f172a;
    --card-bg: #1e293b;
    --border: #334155;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #22c55e;
    --danger: #ef4444;
    --radius: 12px;
}

html { font-size: 16px; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

main { width: 100%; }

.container {
    max-width: 560px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.upload-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2.5rem 2rem;
    text-align: center;
}

.upload-card h1 {
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

/* Drop zone */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 2rem 1rem;
    transition: border-color 0.2s, background 0.2s;
    cursor: pointer;
    margin-bottom: 1rem;
}

.drop-zone.drag-over {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.08);
}

.drop-icon { font-size: 2rem; display: block; margin-bottom: 0.5rem; }

.browse-link {
    color: var(--accent);
    cursor: pointer;
    text-decoration: underline;
}

.hint {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 0.5rem;
}

/* File info */
.file-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    justify-content: center;
}

.file-name {
    font-weight: 600;
    word-break: break-all;
}

.file-size {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.btn-clear {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.btn-clear:hover { color: var(--danger); }

/* Buttons */
.btn-upload {
    width: 100%;
    padding: 0.85rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-upload:hover:not(:disabled) { background: var(--accent-hover); }
.btn-upload:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 0.75rem;
    transition: border-color 0.2s;
}

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

/* Progress */
.progress-bar-track {
    width: 100%;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 1rem;
}

.progress-bar {
    height: 100%;
    background: var(--accent);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.progress-text {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

/* Result */
.result-label {
    color: var(--success);
    font-weight: 600;
    margin-top: 1rem;
    margin-bottom: 0.75rem;
}

.result-link-box {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.download-link-input {
    flex: 1;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    font-size: 0.85rem;
    outline: none;
}

.download-link-input:focus { border-color: var(--accent); }

.btn-copy {
    background: var(--accent);
    border: none;
    color: #fff;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    white-space: nowrap;
    font-size: 0.85rem;
}

.btn-copy:hover { background: var(--accent-hover); }

.expiry-text {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

/* Error */
.error-text {
    color: var(--danger);
    margin-top: 1rem;
    font-weight: 500;
}