/* ============================================================
   PDF 附件提取工具 — Design System
   Elegant dark theme with glassmorphism
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
    --bg-base: #0b0b14;
    --bg-surface: #111120;
    --bg-card: rgba(255, 255, 255, 0.025);
    --bg-card-hover: rgba(255, 255, 255, 0.045);
    --bg-input: rgba(255, 255, 255, 0.04);
    --bg-input-focus: rgba(255, 255, 255, 0.06);

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-medium: rgba(255, 255, 255, 0.10);
    --border-accent: rgba(139, 124, 246, 0.30);
    --border-accent-hover: rgba(139, 124, 246, 0.55);

    --text-primary: #e2e2ec;
    --text-secondary: #9494ad;
    --text-muted: #5e5e78;
    --text-inverse: #0b0b14;

    --accent: #8b7cf6;
    --accent-light: #a899ff;
    --accent-glow: rgba(139, 124, 246, 0.12);
    --accent-glow-strong: rgba(139, 124, 246, 0.25);

    --amber: #f0b429;
    --amber-glow: rgba(240, 180, 41, 0.12);

    --success: #34d399;
    --success-bg: rgba(52, 211, 153, 0.08);
    --error: #f87171;
    --error-bg: rgba(248, 113, 113, 0.08);

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 28px;

    --shadow-glow: 0 0 60px rgba(139, 124, 246, 0.06);
    --shadow-card: 0 8px 40px rgba(0, 0, 0, 0.25);
    --shadow-btn: 0 2px 12px rgba(139, 124, 246, 0.2);

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ---------- Background Decoration ---------- */
.bg-orb {
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    filter: blur(80px);
}

.bg-orb--1 {
    top: -15%;
    right: -8%;
    width: 550px;
    height: 550px;
    background: radial-gradient(circle, rgba(139, 124, 246, 0.07) 0%, transparent 70%);
    animation: orbFloat1 20s ease-in-out infinite;
}

.bg-orb--2 {
    bottom: -20%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(240, 180, 41, 0.04) 0%, transparent 70%);
    animation: orbFloat2 25s ease-in-out infinite;
}

@keyframes orbFloat1 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(-30px, 20px) scale(1.05); }
    66% { transform: translate(20px, -15px) scale(0.95); }
}

@keyframes orbFloat2 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(25px, -20px) scale(1.08); }
    66% { transform: translate(-15px, 25px) scale(0.96); }
}

/* ---------- App Layout ---------- */
.app {
    position: relative;
    z-index: 1;
    max-width: 640px;
    margin: 0 auto;
    padding: 48px 20px 32px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* ---------- Header ---------- */
.app-header {
    text-align: center;
    margin-bottom: 36px;
    animation: fadeInDown 0.6s var(--transition-slow) both;
}

.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    background: var(--accent-glow);
    border: 1px solid var(--border-accent);
    color: var(--accent-light);
    margin-bottom: 20px;
}

.app-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.tagline {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
    letter-spacing: 0.02em;
}

/* ---------- Glass Card ---------- */
.card {
    width: 100%;
    animation: fadeInUp 0.6s var(--transition-slow) 0.15s both;
}

.glass {
    background: var(--bg-card);
    backdrop-filter: blur(24px) saturate(1.2);
    -webkit-backdrop-filter: blur(24px) saturate(1.2);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card), var(--shadow-glow);
    padding: 36px;
    overflow: hidden;
}

/* ---------- Steps ---------- */
.step {
    display: none;
}

.step.active {
    display: block;
    animation: fadeIn 0.4s var(--transition-normal) both;
}

/* ---------- Drop Zone ---------- */
.drop-zone {
    border: 2px dashed var(--border-accent);
    border-radius: var(--radius-lg);
    padding: 52px 32px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.drop-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent-glow);
    opacity: 0;
    transition: opacity var(--transition-normal);
    border-radius: inherit;
}

.drop-zone:hover,
.drop-zone:focus-visible,
.drop-zone--dragover {
    border-color: var(--accent);
    border-style: solid;
    transform: scale(1.005);
}

.drop-zone:hover::before,
.drop-zone:focus-visible::before,
.drop-zone--dragover::before {
    opacity: 1;
}

.drop-zone:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
}

.drop-zone__icon {
    position: relative;
    z-index: 1;
    color: var(--accent-light);
    margin-bottom: 16px;
    transition: transform var(--transition-normal);
}

.drop-zone:hover .drop-zone__icon,
.drop-zone--dragover .drop-zone__icon {
    transform: translateY(-4px);
}

.drop-zone__text {
    position: relative;
    z-index: 1;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.drop-zone__hint {
    position: relative;
    z-index: 1;
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* ---------- File Badge ---------- */
.file-badge {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    margin-bottom: 28px;
}

.file-badge__icon {
    font-size: 1.6rem;
    flex-shrink: 0;
}

.file-badge__info {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.file-badge__name {
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-badge__size {
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* ---------- Password Section ---------- */
.password-section {
    text-align: center;
    margin-bottom: 28px;
}

.lock-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--amber-glow);
    border: 1px solid rgba(240, 180, 41, 0.2);
    color: var(--amber);
    margin-bottom: 16px;
}

.password-label {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.input-wrapper {
    position: relative;
    max-width: 360px;
    margin: 0 auto;
}

.input {
    width: 100%;
    padding: 14px 50px 14px 18px;
    background: var(--bg-input);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    outline: none;
}

.input:focus {
    background: var(--bg-input-focus);
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

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

.btn-icon {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.password-error {
    font-size: 0.82rem;
    color: var(--error);
    margin-top: 10px;
    min-height: 1.2em;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 26px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    outline: none;
    line-height: 1;
    white-space: nowrap;
}

.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.btn--primary {
    background: var(--accent);
    color: var(--text-inverse);
    box-shadow: var(--shadow-btn);
}

.btn--primary:hover {
    background: var(--accent-light);
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(139, 124, 246, 0.3);
}

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

.btn--ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
}

.btn--ghost:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--border-medium);
}

.btn--accent {
    background: linear-gradient(135deg, var(--accent) 0%, #6c5ce7 100%);
    color: white;
    box-shadow: var(--shadow-btn);
}

.btn--accent:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 24px rgba(139, 124, 246, 0.35);
    filter: brightness(1.08);
}

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

.btn-group {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* ---------- Processing ---------- */
.processing {
    text-align: center;
    padding: 40px 0;
}

.progress-spinner {
    width: 56px;
    height: 56px;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--accent);
    border-radius: 50%;
    margin: 0 auto 24px;
    animation: spin 0.9s linear infinite;
}

.processing-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* ---------- Results ---------- */
.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.results-header h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 5px 14px;
    background: var(--success-bg);
    color: var(--success);
    font-size: 0.78rem;
    font-weight: 600;
    border-radius: 100px;
    border: 1px solid rgba(52, 211, 153, 0.15);
}

/* ---------- Expiry Notice ---------- */
.expiry-notice {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--amber-glow);
    border: 1px solid rgba(240, 180, 41, 0.15);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    font-size: 0.8rem;
    color: var(--amber);
}

.expiry-notice svg {
    flex-shrink: 0;
    opacity: 0.8;
}

.expiry-notice strong {
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.04em;
}

.btn-clear {
    margin-left: auto;
    background: transparent;
    border: 1px solid rgba(240, 180, 41, 0.25);
    color: var(--amber);
    padding: 4px 14px;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-clear:hover {
    background: rgba(240, 180, 41, 0.1);
    border-color: rgba(240, 180, 41, 0.4);
}

/* ---------- File List ---------- */
.file-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
    max-height: 360px;
    overflow-y: auto;
    padding-right: 4px;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 13px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    animation: slideInItem 0.35s var(--transition-slow) both;
}

.file-item:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-medium);
}

.file-item__icon {
    font-size: 1.4rem;
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
}

.file-item__info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.file-item__name {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-item__size {
    font-size: 0.76rem;
    color: var(--text-muted);
}

.file-item__download {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-glow);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-sm);
    color: var(--accent-light);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.file-item__download:hover {
    background: var(--accent-glow-strong);
    border-color: var(--accent);
    transform: scale(1.08);
}

/* ---------- Empty State ---------- */
.empty-state {
    text-align: center;
    padding: 32px 0;
}

.empty-state__icon {
    color: var(--text-muted);
    margin-bottom: 18px;
    opacity: 0.5;
}

.empty-state__text {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-state__hint {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

/* ---------- Error State ---------- */
.error-state {
    text-align: center;
    padding: 32px 0;
}

.error-state__icon {
    color: var(--error);
    margin-bottom: 18px;
    opacity: 0.7;
}

.error-state__message {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* ---------- Footer ---------- */
.app-footer {
    margin-top: 28px;
    animation: fadeIn 0.6s var(--transition-slow) 0.3s both;
}

.privacy-notice {
    display: flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.78rem;
}

.privacy-notice svg {
    flex-shrink: 0;
    opacity: 0.6;
}

/* ---------- Custom Scrollbar ---------- */
.file-list::-webkit-scrollbar {
    width: 5px;
}

.file-list::-webkit-scrollbar-track {
    background: transparent;
}

.file-list::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: 100px;
}

.file-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ---------- Animations ---------- */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInItem {
    from { opacity: 0; transform: translateX(-12px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
    .app {
        padding: 28px 14px 24px;
    }

    .app-header h1 {
        font-size: 1.4rem;
    }

    .glass {
        padding: 24px 20px;
        border-radius: var(--radius-lg);
    }

    .drop-zone {
        padding: 40px 20px;
    }

    .btn-group {
        flex-direction: column;
    }

    .btn-group .btn {
        width: 100%;
    }

    .bg-orb--1 { width: 300px; height: 300px; }
    .bg-orb--2 { width: 280px; height: 280px; }
}

@media (max-width: 380px) {
    .glass {
        padding: 20px 16px;
    }

    .drop-zone__icon svg {
        width: 40px;
        height: 40px;
    }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    .bg-orb { animation: none; }
}