/* ============================================
   PDF Translate - Modern Design System
   ============================================ */

/* ---- CSS Custom Properties (Design Tokens) ---- */
:root {
    /* Colors */
    --color-primary: #1a56db;
    --color-primary-hover: #1648c0;
    --color-primary-soft: #eff4fe;
    --color-primary-light: #d6e4fd;
    --color-accent: #0891b2;
    --color-accent-hover: #067394;

    --color-bg: #f7f8fa;
    --color-surface: #ffffff;
    --color-surface-hover: #f3f4f6;
    --color-border: #e5e7eb;
    --color-border-light: #f0f1f3;

    --color-text: #111827;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;

    --color-success: #059669;
    --color-success-soft: #ecfdf5;
    --color-warning: #d97706;
    --color-warning-soft: #fffbeb;
    --color-danger: #dc2626;
    --color-danger-soft: #fef2f2;
    --color-info: #0284c7;
    --color-info-soft: #eff6ff;

    /* Typography */
    --font-sans:
        -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Microsoft YaHei", "Noto Sans SC", sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.1), 0 4px 16px rgba(0, 0, 0, 0.06);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Layout */
    --max-width: 1200px;
    --nav-height: 64px;
}

/* ---- Dark Mode ---- */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0f1117;
        --color-surface: #1a1d27;
        --color-surface-hover: #242734;
        --color-border: #2d3040;
        --color-border-light: #232635;

        --color-text: #f3f4f6;
        --color-text-secondary: #9ca3af;
        --color-text-tertiary: #6b7280;

        --color-primary-soft: #1a2a4a;
        --color-primary-light: #1e3a6a;
        --color-success-soft: #0a2e1a;
        --color-warning-soft: #2e2410;
        --color-danger-soft: #2e1010;
        --color-info-soft: #0a1e3a;

        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
        --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
        --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.5);
    }
}

/* ---- 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;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

img {
    max-width: 100%;
    height: auto;
}

/* ---- Container ---- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--space-4);
    }
}

/* ---- Navigation ---- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--nav-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border-light);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.navbar-brand:hover {
    color: var(--color-primary);
}

.navbar-brand .brand-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 700;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
}

.nav-links .nav-item {
    position: relative;
}

.nav-links .nav-link {
    display: flex;
    align-items: center;
    padding: var(--space-2) var(--space-3);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-links .nav-link:hover {
    color: var(--color-text);
    background: var(--color-surface-hover);
}

.nav-links .nav-link.active {
    color: var(--color-primary);
    background: var(--color-primary-soft);
}

.nav-links .nav-link.primary-link {
    color: white;
    background: var(--color-primary);
    padding: var(--space-2) var(--space-4);
}

.nav-links .nav-link.primary-link:hover {
    background: var(--color-primary-hover);
    color: white;
}

/* Nav dropdown */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-menu {
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 180px;
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--space-1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: all var(--transition-fast);
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-item {
    display: block;
    padding: var(--space-2) var(--space-3);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-dropdown-item:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}

.nav-dropdown-divider {
    height: 1px;
    background: var(--color-border-light);
    margin: var(--space-1) 0;
}

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    padding: var(--space-2);
    cursor: pointer;
    color: var(--color-text);
    border-radius: var(--radius-sm);
}

.nav-toggle:hover {
    background: var(--color-surface-hover);
}

.nav-toggle svg {
    width: 24px;
    height: 24px;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        background: var(--color-surface);
        padding: var(--space-4);
        gap: var(--space-1);
        transform: translateX(100%);
        transition: transform var(--transition-base);
        overflow-y: auto;
    }

    .nav-links.open {
        transform: translateX(0);
    }

    .nav-links .nav-link {
        width: 100%;
        padding: var(--space-3) var(--space-4);
        font-size: 1rem;
    }

    .nav-dropdown-menu {
        position: static;
        box-shadow: none;
        border: none;
        padding-left: var(--space-4);
        opacity: 1;
        visibility: visible;
        transform: none;
    }

    .nav-links .nav-link.primary-link {
        text-align: center;
        justify-content: center;
        margin-top: var(--space-2);
    }
}

/* ---- Main Content ---- */
.main-content {
    flex: 1;
    padding: var(--space-8) 0;
}

@media (max-width: 640px) {
    .main-content {
        padding: var(--space-6) 0;
    }
}

/* ---- Footer ---- */
.footer {
    border-top: 1px solid var(--color-border-light);
    padding: var(--space-6) 0;
    background: var(--color-surface);
}

.footer .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.footer-text {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.footer-links {
    display: flex;
    gap: var(--space-4);
    list-style: none;
}

.footer-links a {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.footer-links a:hover {
    color: var(--color-text-secondary);
}

@media (max-width: 640px) {
    .footer .container {
        flex-direction: column;
        text-align: center;
    }
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-5);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.5;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    user-select: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-surface-hover);
    border-color: var(--color-text-tertiary);
}

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

.btn-ghost:hover:not(:disabled) {
    background: var(--color-surface-hover);
    color: var(--color-text);
}

.btn-success {
    background: var(--color-success);
    color: white;
    border-color: var(--color-success);
}

.btn-success:hover:not(:disabled) {
    background: #047857;
    border-color: #047857;
}

.btn-danger {
    background: var(--color-danger);
    color: white;
    border-color: var(--color-danger);
}

.btn-danger:hover:not(:disabled) {
    background: #b91c1c;
    border-color: #b91c1c;
}

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: 0.8125rem;
}

.btn-lg {
    padding: var(--space-3) var(--space-8);
    font-size: 1rem;
}

.btn-xl {
    padding: var(--space-4) var(--space-10);
    font-size: 1.0625rem;
}

.btn-block {
    width: 100%;
}

/* ---- Cards ---- */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.card-body {
    padding: var(--space-6);
}

.card-header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-border-light);
    font-weight: 600;
    font-size: 1rem;
}

.card-footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--color-border-light);
}

.card-hover:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* ---- Forms ---- */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
}

.form-input {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    outline: none;
}

.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

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

.form-hint {
    margin-top: var(--space-1);
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.form-error {
    color: var(--color-danger);
    font-size: 0.8125rem;
    margin-top: var(--space-1);
}

/* ---- Alerts / Messages ---- */
.alert {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    line-height: 1.5;
}

.alert-success {
    background: var(--color-success-soft);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

.alert-danger {
    background: var(--color-danger-soft);
    color: var(--color-danger);
    border: 1px solid var(--color-danger);
}

.alert-warning {
    background: var(--color-warning-soft);
    color: var(--color-warning);
    border: 1px solid var(--color-warning);
}

.alert-info {
    background: var(--color-info-soft);
    color: var(--color-info);
    border: 1px solid var(--color-info);
}

/* ---- Badges ---- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    line-height: 1.4;
}

.badge-primary {
    background: var(--color-primary-soft);
    color: var(--color-primary);
}
.badge-success {
    background: var(--color-success-soft);
    color: var(--color-success);
}
.badge-warning {
    background: var(--color-warning-soft);
    color: var(--color-warning);
}
.badge-danger {
    background: var(--color-danger-soft);
    color: var(--color-danger);
}
.badge-info {
    background: var(--color-info-soft);
    color: var(--color-info);
}
.badge-secondary {
    background: var(--color-border-light);
    color: var(--color-text-secondary);
}

/* ---- Section Layout ---- */
.section {
    padding: var(--space-16) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-eyebrow {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
    margin-bottom: var(--space-3);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.25;
    margin-bottom: var(--space-3);
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.6;
}

@media (max-width: 640px) {
    .section-title {
        font-size: 1.5rem;
    }

    .section-subtitle {
        font-size: 0.9375rem;
    }
}

/* ---- Grid System ---- */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}
.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}
.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

/* ---- Utility Classes ---- */
.text-center {
    text-align: center;
}
.text-right {
    text-align: right;
}
.text-muted {
    color: var(--color-text-secondary);
}
.text-small {
    font-size: 0.875rem;
}

.flex {
    display: flex;
}
.flex-col {
    flex-direction: column;
}
.items-center {
    align-items: center;
}
.justify-between {
    justify-content: space-between;
}
.justify-center {
    justify-content: center;
}
.gap-1 {
    gap: var(--space-1);
}
.gap-2 {
    gap: var(--space-2);
}
.gap-3 {
    gap: var(--space-3);
}
.gap-4 {
    gap: var(--space-4);
}
.gap-6 {
    gap: var(--space-6);
}
.gap-8 {
    gap: var(--space-8);
}

.mt-2 {
    margin-top: var(--space-2);
}
.mt-3 {
    margin-top: var(--space-3);
}
.mt-4 {
    margin-top: var(--space-4);
}
.mt-6 {
    margin-top: var(--space-6);
}
.mt-8 {
    margin-top: var(--space-8);
}
.mb-2 {
    margin-bottom: var(--space-2);
}
.mb-3 {
    margin-bottom: var(--space-3);
}
.mb-4 {
    margin-bottom: var(--space-4);
}
.mb-6 {
    margin-bottom: var(--space-6);
}
.mb-8 {
    margin-bottom: var(--space-8);
}
.ml-auto {
    margin-left: auto;
}
.mr-auto {
    margin-right: auto;
}

.p-4 {
    padding: var(--space-4);
}
.p-6 {
    padding: var(--space-6);
}
.p-8 {
    padding: var(--space-8);
}

.d-none {
    display: none !important;
}
.d-flex {
    display: flex;
}
.d-block {
    display: block;
}
.d-grid {
    display: grid;
}

.w-full {
    width: 100%;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.96);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.5s ease forwards;
}

.animate-fade-in {
    animation: fadeIn 0.4s ease forwards;
}

.animate-scale-in {
    animation: scaleIn 0.35s ease forwards;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ---- Spinner ---- */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.spinner-lg {
    width: 36px;
    height: 36px;
    border-width: 3px;
}

/* ---- Progress Bar ---- */
.progress {
    width: 100%;
    height: 8px;
    background: var(--color-border-light);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    transition: width 0.4s ease;
}

.progress-bar-striped {
    background-image: linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.15) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.15) 50%,
        rgba(255, 255, 255, 0.15) 75%,
        transparent 75%,
        transparent
    );
    background-size: 1rem 1rem;
}

.progress-bar-animated {
    animation: progress-stripes 1s linear infinite;
}

@keyframes progress-stripes {
    from {
        background-position: 1rem 0;
    }
    to {
        background-position: 0 0;
    }
}

.progress-bar.bg-success {
    background: var(--color-success);
}
.progress-bar.bg-danger {
    background: var(--color-danger);
}
.progress-bar.bg-warning {
    background: var(--color-warning);
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}

/* ============================================
   PAGE-SPECIFIC STYLES
   ============================================ */

/* ---- HERO (Index) ---- */
.hero {
    position: relative;
    min-height: calc(100dvh - var(--nav-height));
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
    padding: var(--space-16) 0;
}

.hero-content {
    animation: fadeInUp 0.6s ease forwards;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    background: var(--color-primary-soft);
    color: var(--color-primary);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 500;
    margin-bottom: var(--space-4);
    border: 1px solid var(--color-primary-light);
}

.hero-title {
    font-size: 3.25rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: var(--space-4);
    color: var(--color-text);
}

.hero-title .highlight {
    color: var(--color-primary);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-8);
    max-width: 480px;
}

.hero-actions {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.8s ease 0.2s forwards;
    opacity: 0;
}

.hero-visual-inner {
    position: relative;
    width: 100%;
    max-width: 480px;
    aspect-ratio: 4/3;
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-visual-content {
    text-align: center;
    padding: var(--space-8);
}

.hero-visual-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
}

.hero-visual-text {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    max-width: 280px;
    margin: 0 auto;
    line-height: 1.6;
}

.hero-visual-decoration {
    position: absolute;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: radial-gradient(
        circle at center,
        var(--color-primary-light),
        transparent 70%
    );
    opacity: 0.4;
    top: -60px;
    right: -60px;
}

.hero-visual-decoration-2 {
    position: absolute;
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: radial-gradient(
        circle at center,
        var(--color-accent),
        transparent 70%
    );
    opacity: 0.3;
    bottom: -40px;
    left: -40px;
}

@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: var(--space-8);
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-description {
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-visual {
        max-width: 420px;
        margin: 0 auto;
    }

    .hero-badge {
        margin-left: auto;
        margin-right: auto;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-description {
        font-size: 1rem;
    }
}

/* ---- Feature Cards ---- */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

@media (max-width: 1024px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-soft);
    border-radius: var(--radius-md);
    font-size: 1.5rem;
    margin-bottom: var(--space-4);
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--color-text);
}

.feature-desc {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ---- Steps (How it Works) ---- */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
}

@media (max-width: 1024px) {
    .steps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .steps-grid {
        grid-template-columns: 1fr;
    }
}

.step-item {
    text-align: center;
    padding: var(--space-6);
}

.step-number {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 700;
    margin: 0 auto var(--space-4);
}

.step-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.step-desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ---- Pricing Card ---- */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
    max-width: 680px;
    margin: 0 auto;
}

@media (max-width: 640px) {
    .pricing-grid {
        grid-template-columns: 1fr;
    }
}

.pricing-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card .buy-btn {
    margin-top: auto;
}

.pricing-card:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.pricing-card.recommended {
    border: 2px solid var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.pricing-card.recommended::before {
    content: "推荐";
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: white;
    padding: 2px 16px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.pricing-name {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-3);
}

.pricing-price {
    font-size: 2.75rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-text);
    margin-bottom: var(--space-1);
}

.pricing-price-period {
    color: var(--color-text-tertiary);
    font-size: 0.9375rem;
    margin-bottom: var(--space-6);
}

.pricing-features {
    list-style: none;
    text-align: left;
    margin-bottom: var(--space-8);
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) 0;
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

.pricing-features li .check {
    color: var(--color-success);
    font-weight: 700;
}

.pricing-card.recommended .pricing-price {
    color: var(--color-primary);
}

.pricing-savings {
    display: inline-block;
    background: var(--color-success-soft);
    color: var(--color-success);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    margin-left: var(--space-1);
}

/* ---- Auth Pages (Login / Register) ---- */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100dvh - var(--nav-height) - 100px);
    padding: var(--space-8) 0;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    animation: scaleIn 0.35s ease forwards;
}

.auth-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.auth-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-1);
}

.auth-header p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

.auth-footer {
    text-align: center;
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border-light);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* ---- Dashboard ---- */
.dashboard-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-8);
}

.dashboard-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

@media (max-width: 640px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: all var(--transition-base);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
}

.stat-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-1);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.2;
}

.stat-value .unit {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text-secondary);
}

.stat-progress {
    margin-top: var(--space-3);
}

.stat-footer {
    margin-top: var(--space-3);
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.stat-footer.danger {
    color: var(--color-danger);
}
.stat-footer.warning {
    color: var(--color-warning);
}

/* User info card */
.user-info-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-2) var(--space-4);
    font-size: 0.9375rem;
}

.user-info-label {
    color: var(--color-text-tertiary);
    font-weight: 500;
}

.user-info-value {
    color: var(--color-text);
}

/* ---- Task List ---- */
.task-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.task-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.task-item:hover {
    border-color: var(--color-border);
    background: var(--color-surface-hover);
}

.task-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
}

.task-item-name {
    font-weight: 500;
    font-size: 0.9375rem;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.task-item-date {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    white-space: nowrap;
}

.task-item-body {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.task-item-error {
    font-size: 0.8125rem;
    color: var(--color-danger);
}

.task-empty {
    text-align: center;
    padding: var(--space-12) var(--space-6);
}

.task-empty-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.task-empty-text {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}

/* ---- Upload Zone (Translate) ---- */
.upload-page {
    max-width: 640px;
    margin: 0 auto;
}

.upload-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-12) var(--space-6);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--color-surface);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--color-primary);
    background: var(--color-primary-soft);
}

.upload-zone-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    opacity: 0.6;
}

.upload-zone-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.upload-zone-hint {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}

.upload-zone-small {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    margin-top: var(--space-3);
}

/* File info card */
.file-info-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-5);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    animation: fadeIn 0.3s ease;
}

.file-info-icon {
    font-size: 1.75rem;
    flex-shrink: 0;
}

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

.file-info-name {
    font-weight: 500;
    font-size: 0.9375rem;
    color: var(--color-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-info-size {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

/* ---- Admin ---- */
.admin-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

@media (max-width: 1024px) {
    .admin-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .admin-stats-grid {
        grid-template-columns: 1fr;
    }
}

.admin-stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    text-align: center;
    transition: all var(--transition-base);
}

.admin-stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.admin-stat-number {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
}

.admin-stat-label {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    margin-top: var(--space-1);
}

/* Tabs */
.tabs {
    display: flex;
    gap: var(--space-1);
    border-bottom: 2px solid var(--color-border-light);
    margin-bottom: var(--space-6);
}

.tab {
    padding: var(--space-3) var(--space-5);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    border: none;
    background: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
}

.tab:hover {
    color: var(--color-text);
}

.tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Data Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.data-table th {
    text-align: left;
    padding: var(--space-3) var(--space-4);
    font-weight: 600;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border-light);
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.data-table td {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-light);
    color: var(--color-text);
}

.data-table tr:hover td {
    background: var(--color-surface-hover);
}

.data-table-wrap {
    overflow-x: auto;
}

/* ---- Toast ---- */
.toast-container {
    position: fixed;
    top: calc(var(--nav-height) + var(--space-4));
    right: var(--space-4);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.toast {
    padding: var(--space-3) var(--space-5);
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    animation: fadeInUp 0.3s ease;
    max-width: 360px;
}

.toast-success {
    border-left: 3px solid var(--color-success);
}
.toast-danger {
    border-left: 3px solid var(--color-danger);
}
.toast-info {
    border-left: 3px solid var(--color-info);
}

/* ---- Promo Banner (Index) ---- */
.promo-banner {
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    text-align: center;
}

.promo-banner h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.promo-banner p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
    font-size: 0.9375rem;
}

/* ---- Section Divider ---- */
/* ---- Modal (global, used by change-password) ---- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: var(--space-4);
}

.modal-content {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    max-width: 420px;
    width: 100%;
    position: relative;
    box-shadow: var(--shadow-xl);
    animation: scaleIn 0.2s ease;
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--color-text-tertiary);
    line-height: 1;
}

.modal-close:hover {
    color: var(--color-text);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 0 var(--space-6);
    color: var(--color-text);
}

.section-divider {
    height: 1px;
    background: var(--color-border-light);
    margin: var(--space-4) 0;
}

/* ---- Responsive Tables ---- */
@media (max-width: 768px) {
    .data-table thead {
        display: none;
    }

    .data-table,
    .data-table tbody,
    .data-table tr,
    .data-table td {
        display: block;
    }

    .data-table tr {
        padding: var(--space-3);
        border: 1px solid var(--color-border-light);
        border-radius: var(--radius-md);
        margin-bottom: var(--space-3);
    }

    .data-table td {
        padding: var(--space-2) 0;
        border: none;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .data-table td::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--color-text-secondary);
        font-size: 0.8125rem;
    }
}

/* ---- Utilities ---- */
.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ---- Spacing helpers ---- */
.py-4 {
    padding-top: var(--space-4);
    padding-bottom: var(--space-4);
}
.py-6 {
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
}
.py-8 {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
}
.py-12 {
    padding-top: var(--space-12);
    padding-bottom: var(--space-12);
}
.py-16 {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
}

/* ---- Status indicator dot ---- */
.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.status-dot.success {
    background: var(--color-success);
}
.status-dot.warning {
    background: var(--color-warning);
}
.status-dot.danger {
    background: var(--color-danger);
}
.status-dot.info {
    background: var(--color-info);
}
.status-dot.secondary {
    background: var(--color-text-tertiary);
}

/* ---- Link card style ---- */
.link-card {
    display: block;
    padding: var(--space-4) var(--space-5);
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    color: var(--color-text);
}

.link-card:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
    color: var(--color-text);
}