/* ==========================================================================
   好论点智检 DocCheck - Editorial Academic Theme
   编辑杂志风 + 学术纸质感设计系统
   ========================================================================== */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700;900&family=Noto+Sans+SC:wght@300;400;500;600;700&display=swap');

/* --- CSS Variables --- */
:root {
    --color-bg: #faf8f5;
    --color-bg-warm: #f5f0e8;
    --color-bg-dark: #1a1a2e;
    --color-gold: #c9a96e;
    --color-gold-light: #e8d5a3;
    --color-gold-dark: #a08040;
    --color-green: #4a6741;
    --color-green-light: #e8f0e6;
    --color-red: #b5493a;
    --color-text: #2d2d2d;
    --color-text-secondary: #6b6b6b;
    --color-text-muted: #9a9a9a;
    --color-border: #e0dcd6;
    --color-card: #ffffff;
    --color-card-warm: #fdfbf7;
    --shadow-sm: 0 1px 3px rgba(26,26,46,0.06);
    --shadow-md: 0 4px 16px rgba(26,26,46,0.08);
    --shadow-lg: 0 12px 40px rgba(26,26,46,0.12);
    --shadow-gold: 0 4px 20px rgba(201,169,110,0.25);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --font-display: 'Noto Serif SC', 'STSong', 'SimSun', serif;
    --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Global --- */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.7;
    overflow-x: hidden;
}

/* 纸张纹理背景 */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.018;
    pointer-events: none;
    z-index: 9999;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: 0.02em;
}

/* 装饰性分隔线 */
.divider-gold {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-gold), var(--color-gold-light));
    border-radius: 2px;
}

/* 文本阴影 */
.text-shadow {
    text-shadow: 0 2px 12px rgba(26, 26, 46, 0.25);
}
/* ==========================================================================
   Buttons - Editorial Style
   ========================================================================== */

.btn-primary {
    background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-dark) 100%);
    color: #ffffff;
    padding: 0.625rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-family: var(--font-body);
    border: none;
    transition: var(--transition-base);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.02em;
    box-shadow: var(--shadow-sm);
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-gold-light) 0%, var(--color-gold) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-gold);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary > * {
    position: relative;
    z-index: 1;
}

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

.btn-secondary {
    background: linear-gradient(135deg, var(--color-green) 0%, #3a5233 100%);
    color: #ffffff;
    padding: 0.625rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-family: var(--font-body);
    border: none;
    transition: var(--transition-base);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(74,103,65,0.3);
}

.btn-outline {
    background: transparent;
    color: var(--color-gold-dark);
    padding: 0.625rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-family: var(--font-body);
    border: 1.5px solid var(--color-gold);
    transition: var(--transition-base);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    position: relative;
}

.btn-outline:hover {
    background: var(--color-gold);
    color: #ffffff;
    border-color: var(--color-gold);
    transform: translateY(-2px);
    box-shadow: var(--shadow-gold);
}

/* ==========================================================================
   Forms - Refined Input
   ========================================================================== */

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: var(--font-body);
    transition: var(--transition-base);
    background-color: var(--color-card);
    color: var(--color-text);
    box-sizing: border-box;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-gold);
    box-shadow: 0 0 0 4px rgba(201, 169, 110, 0.12);
    background-color: #ffffff;
}

.form-input::placeholder {
    color: var(--color-text-muted);
    font-weight: 300;
}

/* ==========================================================================
   Card Hover Effects
   ========================================================================== */

.card-hover {
    transition: var(--transition-base);
    border-radius: var(--radius-md);
    background: var(--color-card);
    border: 1px solid var(--color-border);
}

.card-hover:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

/* ==========================================================================
   Animations
   ========================================================================== */

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

.fade-in {
    animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideUp {
    from {
        transform: translateY(40px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.slide-up {
    animation: slideUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.slide-up:nth-child(2) { animation-delay: 0.12s; }
.slide-up:nth-child(3) { animation-delay: 0.24s; }
.slide-up:nth-child(4) { animation-delay: 0.36s; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.animate-float {
    animation: float 4s ease-in-out infinite;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.shimmer {
    background: linear-gradient(90deg, transparent 0%, rgba(201,169,110,0.1) 50%, transparent 100%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
}

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

.animate-spin {
    animation: spin 1s linear infinite;
}

/* 视口内滚动触发动画 */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   Step Wizard - Refined
   ========================================================================== */

.step-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--color-border);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    transition: var(--transition-base);
    flex-shrink: 0;
    font-family: var(--font-display);
}

.step-circle-active {
    background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-dark) 100%);
    color: #ffffff;
    box-shadow: var(--shadow-gold);
}

.step-circle-done {
    background: linear-gradient(135deg, var(--color-green) 0%, #3a5233 100%);
    color: #ffffff;
    font-size: 0;
}

.step-circle-done::before {
    content: '\2713';
    font-size: 14px;
}

.step-line {
    background-color: var(--color-border);
    transition: background-color var(--transition-base);
    height: 2px;
}

.step-line-active {
    background: linear-gradient(90deg, var(--color-green), var(--color-green-light));
}

.step-panel {
    animation: fadeIn 0.4s ease-in-out;
}
/* ==========================================================================
   Service Options & Tabs
   ========================================================================== */

.service-option {
    border: 1.5px solid var(--color-border);
    background-color: var(--color-card);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
    cursor: pointer;
}

.service-option:hover {
    border-color: var(--color-gold);
    box-shadow: var(--shadow-md);
}

.service-option.selected {
    border-color: var(--color-gold);
    background: linear-gradient(135deg, #fdfbf7 0%, #f5f0e8 100%);
    box-shadow: 0 0 0 3px rgba(201, 169, 110, 0.15);
}

/* Tab Buttons */
.tab-btn {
    border-bottom: 2px solid transparent;
    transition: var(--transition-base);
    cursor: pointer;
    font-family: var(--font-body);
    font-weight: 500;
    color: var(--color-text-muted);
    padding-bottom: 0.5rem;
}

.tab-btn.tab-active {
    color: var(--color-gold-dark);
    border-bottom-color: var(--color-gold);
}

.tab-btn:hover {
    color: var(--color-gold-dark);
}

/* AI Option Cards */
.ai-option {
    transition: var(--transition-base);
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--color-border);
}

.ai-option:hover {
    border-color: var(--color-gold);
    background-color: #fdfbf7;
}

.ai-option:has(input[type="radio"]:checked) {
    border-color: var(--color-gold);
    background: linear-gradient(135deg, #fdfbf7 0%, #f5f0e8 100%);
    box-shadow: 0 0 0 3px rgba(201, 169, 110, 0.15);
}

.ai-option input[type="radio"]:checked ~ div {
    color: var(--color-gold-dark);
}

/* ==========================================================================
   Drag & Drop Areas
   ========================================================================== */

#drop-area, #format-drop-area, #template-drop-area, #tpl-drop {
    transition: var(--transition-base);
    border-radius: var(--radius-md);
}

#drop-area.dragover,
#format-drop-area.dragover,
#template-drop-area.dragover,
#tpl-drop.dragover {
    border-color: var(--color-gold) !important;
    background: linear-gradient(135deg, #fdfbf7 0%, #f5f0e8 100%) !important;
    box-shadow: 0 0 0 3px rgba(201, 169, 110, 0.15);
}

/* ==========================================================================
   Modal Enhancements
   ========================================================================== */

.hidden {
    display: none !important;
}

#upload-modal .step-panel {
    min-height: 220px;
}

/* Modal backdrop with blur */
.fixed.inset-0.bg-black.bg-opacity-50 {
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

/* ==========================================================================
   Status Badges
   ========================================================================== */

.status-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.02em;
}

/* ==========================================================================
   Scrollbar - Refined
   ========================================================================== */

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: #d4cfc8;
    border-radius: 10px;
}

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

/* ==========================================================================
   Textarea
   ========================================================================== */

textarea.form-input {
    resize: vertical;
    min-height: 140px;
    font-family: var(--font-body);
    line-height: 1.8;
}

/* ==========================================================================
   Table Row Hover
   ========================================================================== */

table tbody tr {
    transition: background-color var(--transition-fast);
}

table tbody tr:hover {
    background-color: var(--color-bg-warm);
}

/* ==========================================================================
   Navigation - Sticky Enhancement
   ========================================================================== */

nav.sticky {
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background-color: rgba(250, 248, 245, 0.92) !important;
    border-bottom: 1px solid var(--color-border);
}

/* ==========================================================================
   Hero Section - Gradient Enhancement
   ========================================================================== */

header {
    position: relative;
    overflow: hidden;
}

header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 80px;
    background: linear-gradient(to bottom, transparent, var(--color-bg));
    pointer-events: none;
}

/* Hero decorative shapes */
header .hero-shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
    pointer-events: none;
}

/* ==========================================================================
   Section Styling
   ========================================================================== */

section {
    position: relative;
}

/* 交替section背景 */
section:nth-child(odd of .mb-16) {
    background: linear-gradient(180deg, transparent 0%, rgba(201,169,110,0.02) 50%, transparent 100%);
}

/* ==========================================================================
   Footer Enhancement
   ========================================================================== */

footer {
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
    border-radius: 2px;
}

/* ==========================================================================
   Task Generator Page - Specific Styles
   ========================================================================== */

.task-section {
    border-left: 3px solid var(--color-gold);
    padding-left: 1.25rem;
    margin-bottom: 1.5rem;
}

.task-section h4 {
    font-family: var(--font-display);
    color: var(--color-text);
    font-weight: 600;
    margin-bottom: 0.75rem;
    font-size: 1.05rem;
}

.task-section p,
.task-section div {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ==========================================================================
   Toast Notification - Refined
   ========================================================================== */

#toast {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-family: var(--font-body);
    font-weight: 500;
}

/* ==========================================================================
   Loading Animation - Elegant
   ========================================================================== */

#loading-modal .animate-spin {
    border-width: 3px;
    border-color: var(--color-gold);
    border-top-color: transparent;
}

/* ==========================================================================
   Responsive Adjustments
   ========================================================================== */

@media (max-width: 640px) {
    .btn-primary, .btn-secondary, .btn-outline {
        padding: 0.5rem 1.25rem;
        font-size: 0.9rem;
    }
    h1 { font-size: 1.875rem !important; }
    h2 { font-size: 1.5rem !important; }
}

@media (max-width: 768px) {
    .hero-shape { display: none; }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
    header, nav, footer, .no-print { display: none !important; }
    body { background: #fff; }
}

/* ==========================================================================
   Accessibility: Reduced Motion
   ========================================================================== */

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

/* ==========================================================================
   Decorative Elements
   ========================================================================== */

/* 金色角标装饰 */
.corner-accent {
    position: relative;
}
.corner-accent::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    width: 24px;
    height: 24px;
    border-top: 3px solid var(--color-gold);
    border-left: 3px solid var(--color-gold);
    border-radius: 4px 0 0 0;
    opacity: 0.6;
}

/* 引用块样式 */
.quote-block {
    border-left: 3px solid var(--color-gold);
    padding-left: 1.25rem;
    font-style: italic;
    color: var(--color-text-secondary);
    font-family: var(--font-display);
}