/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --border-light: #f3f4f6;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    background: linear-gradient(135deg, #f3f6fb 0%, #e9effc 100%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Header */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
}

.nav-logo span {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-8);
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-20) 0;
    text-align: center;
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--spacing-6);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-12);
    opacity: 0.9;
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-12);
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-2);
}

.stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Calculator Section */
.calculator-section {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 40px;
    padding-bottom: 60px;
}

.calculator-wrapper {
    width: 100%;
    max-width: 900px;
    display: flex;
    gap: var(--spacing-8);
    justify-content: center;
    align-items: stretch;
}

.calculator-card {
    max-width: 480px !important;
    min-width: 360px;
    margin: 0 auto;
    box-shadow: 0 8px 32px rgba(30,64,175,0.10), 0 2px 8px rgba(0,0,0,0.04);
    border-radius: 22px;
    background: #fff;
    padding: 38px 32px 32px 32px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.calculator-card:hover {
    box-shadow: 0 16px 48px 0 rgba(99,102,241,0.18), 0 3px 12px 0 rgba(16,185,129,0.12);
    transform: translateY(-2px) scale(1.01);
}

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

.calculator-header h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-2);
    color: var(--text-primary);
}

.calculator-header p {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
}

/* Form Styles */
.form-section {
    margin-bottom: var(--spacing-8);
}

.form-section h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--text-primary);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 500;
    margin-bottom: var(--spacing-2);
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    padding: var(--spacing-4) var(--spacing-5);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-lg);
    background: rgba(243,244,246,0.7);
    transition: border-color 0.2s, box-shadow 0.2s;
    box-shadow: 0 1px 4px 0 rgba(99,102,241,0.04);
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(99,102,241,0.15);
    background: #fff;
}

.form-group input.valid,
.form-group select.valid {
    border-color: var(--secondary-color);
    background: rgba(16,185,129,0.07);
}

.form-group input.invalid,
.form-group select.invalid {
    border-color: #ef4444;
    background: rgba(239,68,68,0.07);
}

.input-error { border: 2px solid #e74c3c !important; box-shadow: 0 0 0 2px #fdecea !important; transition: border 0.2s, box-shadow 0.2s; }

/* Activity Options */
.activity-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.activity-option {
    position: relative;
}

.activity-option input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.activity-option label {
    display: block;
    padding: var(--spacing-4);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s ease;
}

.activity-option input[type="radio"]:checked + label {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.activity-content h4 {
    font-weight: 600;
    margin-bottom: var(--spacing-1);
    color: var(--text-primary);
}

.activity-content p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-2);
}

.multiplier {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

/* Goal Options */
.goal-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-3);
}

.goal-option {
    position: relative;
}

.goal-option input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.goal-option label {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-4);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.goal-option input[type="radio"]:checked + label {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.goal-option i {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-2);
    color: var(--primary-color);
}

.goal-option span {
    font-weight: 500;
    color: var(--text-primary);
}

/* Calculate Button */
.calculate-btn {
    width: 100%;
    padding: var(--spacing-5) var(--spacing-8);
    background: linear-gradient(90deg, var(--primary-color) 60%, var(--secondary-color) 100%);
    color: #fff;
    border: none;
    border-radius: var(--radius-2xl);
    font-size: var(--font-size-xl);
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 2px 8px 0 rgba(99,102,241,0.10);
    transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
    margin-top: var(--spacing-6);
    letter-spacing: 0.02em;
}

.calculate-btn:hover {
    background: linear-gradient(90deg, var(--primary-dark) 60%, var(--secondary-color) 100%);
    box-shadow: 0 4px 16px 0 rgba(99,102,241,0.18);
    transform: scale(1.02);
}

/* Results Card */
.results-card {
    background: rgba(255,255,255,0.92);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-10);
    box-shadow: 0 8px 32px 0 rgba(99,102,241,0.10), 0 1.5px 6px 0 rgba(16,185,129,0.08);
    backdrop-filter: blur(8px);
    border: 1.5px solid rgba(99,102,241,0.08);
    animation: fadeIn 0.7s cubic-bezier(.39,.575,.56,1.000);
}

.results-card.hidden {
    display: none;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-6);
    padding-bottom: var(--spacing-4);
    border-bottom: 1px solid var(--border-color);
}

.results-header h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
}

.reset-btn {
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
}

.reset-btn:hover {
    background: var(--border-color);
}

/* Results Content */
.results-content {
    margin-bottom: var(--spacing-6);
}

.result-item {
    text-align: center;
    padding: var(--spacing-4);
    margin-bottom: var(--spacing-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.result-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-1);
}

.result-unit {
    font-size: var(--font-size-sm);
    color: var(--text-light);
}

/* Macro Breakdown */
.results-breakdown {
    margin-bottom: var(--spacing-6);
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--border-color);
}

.results-breakdown h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--text-primary);
}

.macro-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-3);
}

.macro-item {
    text-align: center;
    padding: var(--spacing-3);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.macro-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-1);
}

.macro-value {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

/* Results Actions */
.results-actions {
    display: flex;
    gap: var(--spacing-3);
}

.action-btn {
    flex: 1;
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
}

.action-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

/* Features Section */
.features-section {
    padding: var(--spacing-20) 0;
    background: var(--bg-primary);
}

.features-section h2 {
    text-align: center;
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-12);
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-8);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-8);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    transition: transform 0.2s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-6);
}

.feature-icon i {
    font-size: var(--font-size-xl);
    color: white;
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer */
.footer {
    background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    color: white;
    padding: var(--spacing-20) 0 var(--spacing-12);
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--primary-color) 50%, transparent 100%);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-12);
    margin-bottom: var(--spacing-12);
}

.footer-brand {
    padding-right: var(--spacing-8);
}

.footer-brand-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
}

.footer-brand-header i {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
}

.footer-brand-header h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin: 0;
}

.footer-brand-header h3 span {
    color: var(--primary-color);
}

.footer-brand p {
    color: #d1d5db;
    line-height: 1.7;
    margin-bottom: var(--spacing-6);
    font-size: var(--font-size-sm);
}

.highlight-text {
    color: var(--primary-color);
    font-weight: 500;
}

.footer-social {
    display: flex;
    gap: var(--spacing-4);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-lg);
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.footer-section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
}

.footer-section-header i {
    font-size: var(--font-size-lg);
    color: var(--primary-color);
}

.footer-section h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
    color: white;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-3);
}

.footer-section ul li a {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: #d1d5db;
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: all 0.3s ease;
    padding: var(--spacing-2) 0;
}

.footer-section ul li a i {
    font-size: var(--font-size-xs);
    color: var(--primary-color);
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: white;
    transform: translateX(4px);
}

.footer-section ul li a:hover i {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-8);
    color: #9ca3af;
    font-size: var(--font-size-sm);
}

.footer-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--primary-color) 50%, transparent 100%);
    margin-bottom: var(--spacing-6);
}

.footer-bottom p {
    margin: 0;
}

.footer-bottom .highlight-text {
    color: var(--primary-color);
    font-weight: 600;
}

.footer-bottom i {
    color: #ef4444;
    margin: 0 var(--spacing-1);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-stats {
        gap: var(--spacing-6);
    }
    
    .calculator-wrapper {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-6);
    }
    
    .calculator-card,
    .results-card {
        padding: var(--spacing-8);
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .goal-options {
        grid-template-columns: 1fr;
    }
    
    .macro-grid {
        grid-template-columns: 1fr;
    }
    
    .results-actions {
        flex-direction: column;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
    }
    
    .footer-brand {
        padding-right: 0;
        text-align: center;
    }
    
    .footer-brand-header {
        justify-content: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .footer-section-header {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-3);
    }
    
    .nav-container {
        padding: 0 var(--spacing-3);
    }
    
    .hero {
        padding: var(--spacing-12) 0;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .calculator-section {
        padding: var(--spacing-12) 0;
    }
    
    .calculator-card,
    .results-card {
        padding: var(--spacing-5);
        border-radius: var(--radius-lg);
    }
    
    .features-section {
        padding: var(--spacing-12) 0;
    }
    
    .footer {
        padding: var(--spacing-12) 0 var(--spacing-8);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
    }
    
    .footer-brand {
        padding-right: 0;
        text-align: center;
    }
    
    .footer-brand-header {
        justify-content: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .footer-section-header {
        justify-content: center;
    }
}

@media (max-width: 900px) {
    .calculator-wrapper {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-6);
    }
    .calculator-card, .results-card {
        padding: var(--spacing-8);
    }
    .calculator-section {
        min-height: unset;
        padding-top: 18px;
        padding-bottom: 18px;
    }
    .main-flex {
        min-height: unset;
    }
    .calculator-card {
        max-width: 98vw !important;
        min-width: unset;
        padding: 18px 6px 16px 6px;
    }
}

@media (max-width: 600px) {
    .calculator-card, .results-card {
        padding: var(--spacing-5);
        border-radius: var(--radius-lg);
    }
    .calculator-section {
        min-height: unset;
        padding: var(--spacing-8) 0;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-card:not(.hidden) {
    animation: fadeIn 0.5s ease-out;
}

/* 结果分组卡片2x2宫格美化 */
.result-card-pro {
  max-width: 520px;
  margin: 0 auto;
  background: #fff;
  border-radius: 24px;
  box-shadow: 0 8px 32px rgba(30,64,175,0.10), 0 2px 8px rgba(0,0,0,0.04);
  padding: 38px 32px 32px 32px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 28px;
  animation: fadeIn 0.7s cubic-bezier(.4,0,.2,1);
}
.result-card-pro h2 {
  font-size: 1.7rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: #181c32;
  letter-spacing: 0.01em;
}
.result-main, .result-sub {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}
.result-block {
  background: #f7faff;
  border-radius: 18px;
  box-shadow: 0 2px 12px rgba(30,64,175,0.06);
  padding: 22px 10px 16px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 0;
}
.result-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: #6b7280;
  margin-bottom: 6px;
  letter-spacing: 0.01em;
}
.result-value {
  font-size: 1.3rem;
  font-weight: 700;
  color: #1a73e8;
  margin-bottom: 4px;
}
.result-value span {
  font-size: 0.98rem;
  font-weight: 400;
  color: #888;
}
.result-value.highlight {
  color: #e67e22;
  font-size: 1.45rem;
}
.result-value.highlight-big {
  color: #e67e22;
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: 0.01em;
}
.result-block .macros {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 1.12rem;
  color: #2563eb;
  margin-bottom: 2px;
}
.result-block .macros span {
  font-size: 1.12rem;
  color: #2563eb;
  font-weight: 700;
}
.result-block .macros b {
  color: #1a73e8;
  font-weight: 800;
}
.result-desc {
  font-size: 0.97rem;
  color: #8b98b6;
  margin-top: 2px;
  margin-bottom: 0;
  font-weight: 400;
}
@media (max-width: 700px) {
  .result-card-pro {
    padding: 14px 2vw 12px 2vw;
    max-width: 99vw;
  }
  .result-main, .result-sub {
    grid-template-columns: 1fr;
    gap: 10px;
  }
}
/* 结果分组卡片2x2宫格美化结束 */

/* 分栏动效核心样式 */
.main-flex {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  margin-top: 0;
  margin-bottom: 0;
  min-height: 520px;
  transition: all 0.6s cubic-bezier(.4,0,.2,1);
}
.form-area, .result-area {
  transition: all 0.6s cubic-bezier(.4,0,.2,1);
}
.form-area {
  display: flex;
  justify-content: center;
  align-items: center;
  flex: 1 1 360px;
  max-width: 480px;
  z-index: 2;
}
.result-area {
  flex: 1 1 360px;
  max-width: 540px;
  min-width: 320px;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transform: translateX(60px);
  z-index: 1;
}
.main-flex.split .form-area {
  transform: translateX(-80px) scale(0.98);
  box-shadow: 0 2px 12px rgba(30,64,175,0.04);
}
.main-flex.split .result-area {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}
@media (max-width: 900px) {
  .main-flex, .main-flex.split {
    flex-direction: column;
    gap: 0;
    min-height: unset;
  }
  .form-area, .result-area {
    max-width: 99vw;
    min-width: unset;
    transform: none !important;
    box-shadow: none !important;
  }
  .result-area {
    opacity: 1 !important;
    pointer-events: auto !important;
    margin-top: 18px;
  }
}

/* 可选：背景装饰圆形 */
body::before {
  content: '';
  position: fixed;
  left: -120px;
  top: 10vh;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle, #e0e7ff 0%, #f3f6fb 80%);
  opacity: 0.35;
  z-index: 0;
  border-radius: 50%;
  pointer-events: none;
}
body::after {
  content: '';
  position: fixed;
  right: -100px;
  bottom: 8vh;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, #c7d2fe 0%, #e9effc 80%);
  opacity: 0.22;
  z-index: 0;
  border-radius: 50%;
  pointer-events: none;
}

/* Info Section */
.info-section {
    padding: var(--spacing-16) 0;
    background: var(--bg-secondary);
}

.info-content {
    max-width: 800px;
    margin: 0 auto;
}

.info-content h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-6);
    color: var(--text-primary);
    text-align: center;
}

.info-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin: var(--spacing-8) 0 var(--spacing-4);
    color: var(--text-primary);
}

.info-content p {
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-4);
}

.formula-box {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    margin: var(--spacing-6) 0;
    box-shadow: var(--shadow-sm);
}

.formula-box p {
    margin-bottom: var(--spacing-2);
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
}

/* Activity Section */
.activity-section {
    padding: var(--spacing-16) 0;
    background: var(--bg-primary);
}

.activity-section h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-12);
    color: var(--text-primary);
    text-align: center;
}

.activity-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-6);
    max-width: 1200px;
    margin: 0 auto;
}

.activity-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.activity-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.activity-item h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    color: var(--primary-color);
}

.activity-item p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-4);
    font-weight: 500;
}

.activity-item ul {
    list-style: none;
    padding: 0;
}

.activity-item ul li {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2);
    padding-left: var(--spacing-4);
    position: relative;
}

.activity-item ul li::before {
    content: '•';
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* FAQ Section */
.faq-section {
    padding: var(--spacing-16) 0;
    background: var(--bg-secondary);
}

.faq-section h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-12);
    color: var(--text-primary);
    text-align: center;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-6);
    max-width: 1200px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.faq-item h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--text-primary);
}

.faq-item p {
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-secondary);
}

/* Responsive adjustments for new sections */
@media (max-width: 768px) {
    .activity-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
    }
    
    .faq-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
    }
    
    .info-content h2,
    .activity-section h2,
    .faq-section h2 {
        font-size: var(--font-size-2xl);
    }
    
    .formula-box {
        padding: var(--spacing-4);
        font-size: var(--font-size-xs);
    }
}

/* Blog Styles */
.blog-hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-20) 0;
    text-align: center;
}

.blog-hero h1 {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--spacing-4);
}

.blog-hero p {
    font-size: var(--font-size-xl);
    opacity: 0.9;
}

.blog-section {
    padding: var(--spacing-16) 0;
    background: var(--bg-primary);
}

.blog-section:nth-child(even) {
    background: var(--bg-secondary);
}

.blog-section h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-12);
    color: var(--text-primary);
    text-align: center;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-8);
    max-width: 1200px;
    margin: 0 auto;
}

.blog-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

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

.blog-card.featured {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

.blog-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.blog-card.featured .blog-image {
    height: 100%;
}

.blog-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.blog-card:hover .blog-image img {
    transform: scale(1.05);
}

.blog-content {
    padding: var(--spacing-6);
}

.blog-meta {
    display: flex;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-4);
}

.blog-category {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.blog-date {
    color: var(--text-light);
    font-size: var(--font-size-sm);
}

.blog-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
    line-height: 1.4;
}

.blog-content h3 a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.blog-content h3 a:hover {
    color: var(--primary-color);
}

.blog-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-4);
}

.read-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: color 0.2s ease;
}

.read-more:hover {
    color: var(--primary-dark);
}

/* Categories Section */
.categories-section {
    padding: var(--spacing-16) 0;
    background: var(--bg-secondary);
}

.categories-section h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-12);
    color: var(--text-primary);
    text-align: center;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-6);
    max-width: 1000px;
    margin: 0 auto;
}

.category-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-8);
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

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

.category-card i {
    font-size: var(--font-size-4xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-4);
}

.category-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
}

.category-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Blog Responsive */
@media (max-width: 768px) {
    .blog-hero h1 {
        font-size: var(--font-size-4xl);
    }
    
    .blog-hero p {
        font-size: var(--font-size-lg);
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
    }
    
    .blog-card.featured {
        grid-template-columns: 1fr;
    }
    
    .blog-card.featured .blog-image {
        height: 200px;
    }
    
    .categories-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: var(--spacing-4);
    }
}

/* Article Styles */
.article-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-16) 0;
    text-align: center;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-6);
    flex-wrap: wrap;
}

.article-category {
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.article-date,
.article-read-time {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

.article-header h1 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-6);
    line-height: 1.2;
}

.article-excerpt {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

.article-content {
    padding: var(--spacing-16) 0;
    background: var(--bg-primary);
}

.article-body {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

.article-body h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin: var(--spacing-12) 0 var(--spacing-6);
    color: var(--text-primary);
}

.article-body h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin: var(--spacing-8) 0 var(--spacing-4);
    color: var(--text-primary);
}

.article-body p {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-4);
}

.article-body ul,
.article-body ol {
    margin: var(--spacing-4) 0;
    padding-left: var(--spacing-6);
}

.article-body li {
    margin-bottom: var(--spacing-2);
    color: var(--text-secondary);
}

.article-body a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.article-body a:hover {
    text-decoration: underline;
}

.tip-box {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border: 1px solid #f59e0b;
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    margin: var(--spacing-6) 0;
}

.tip-box h4 {
    color: #92400e;
    font-weight: 600;
    margin-bottom: var(--spacing-3);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.tip-box p {
    color: #92400e;
    margin: 0;
}

.example-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    margin: var(--spacing-6) 0;
}

.example-box h4 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
}

.example-box ol {
    margin: 0;
    padding-left: var(--spacing-6);
}

.example-box li {
    margin-bottom: var(--spacing-3);
    color: var(--text-secondary);
}

.cta-box {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-8);
    margin: var(--spacing-12) 0;
    text-align: center;
}

.cta-box h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
}

.cta-box p {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-6);
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background: white;
    color: var(--primary-color);
    padding: var(--spacing-4) var(--spacing-8);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: all 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Related Articles */
.related-articles {
    margin-top: var(--spacing-16);
    padding-top: var(--spacing-12);
    border-top: 1px solid var(--border-color);
}

.related-articles h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-8);
    color: var(--text-primary);
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-6);
}

.related-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

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

.related-card h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-3);
    color: var(--text-primary);
}

.related-card p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    margin: 0;
}

/* Article Responsive */
@media (max-width: 768px) {
    .article-header h1 {
        font-size: var(--font-size-3xl);
    }
    
    .article-excerpt {
        font-size: var(--font-size-base);
    }
    
    .article-meta {
        flex-direction: column;
        gap: var(--spacing-2);
    }
    
    .related-grid {
        grid-template-columns: 1fr;
    }
}