/* CSS Variables - Brand Color System */
:root {
    --primary-blue: #3498db;
    --secondary-purple: #8e44ad;
    --dark-text: #2c3e50;
    --light-text: #555;
    --background-light: #f8f9fa;
    --white: #ffffff;
    --border-light: #e0e0e0;
    --success-green: #27ae60;
    --warning-red: #e74c3c;
    --shadow-light: rgba(0,0,0,0.1);
    --shadow-medium: rgba(0,0,0,0.15);
    --transition-fast: 0.3s ease;
    
    /* 新设计系统色彩 - 拥抱自然与文化 */
    --text-primary: #ffffff;
    --text-secondary: #e8f5e8;
    --text-muted: #c5d9c5;
    --accent-green: #2ecc71;
    --accent-hover: #27ae60;
    --card-background: rgba(255, 255, 255, 0.12);
    --card-border: rgba(255, 255, 255, 0.25);
    --deep-green: #004d40;
    --brand-blue: #27ae60;
}

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

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

body {
    font-family: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--deep-green);
    background-image: 
        radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(135deg, var(--deep-green), var(--brand-blue));
    background-size: 4px 4px, cover;
    min-height: 100vh;
    transition: all 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Glassmorphism Card - 核心组件 */
.glass-card {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all var(--transition-fast);
}

.glass-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.2);
}

/* Header and Navigation */
.navbar {
    background: var(--card-background);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--card-border);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: inherit;
    padding: 0.5rem 1rem;
    border-radius: 12px;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.logo-content:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.logo h1 {
    color: var(--text-primary);
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-family: 'Poppins', sans-serif;
    line-height: 1.2;
}

.logo img {
    border-radius: 8px;
    transition: transform 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.logo img:hover {
    transform: scale(1.05);
}

.logo svg {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}

/* Mobile logo adjustments */
@media (max-width: 768px) {
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .logo svg {
        width: 32px;
        height: 32px;
    }
}

.nav-menu {
    display: none; /* 隐藏空导航菜单 */
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: all var(--transition-fast);
    padding: 0.75rem 1.2rem;
    border-radius: 25px;
    position: relative;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.nav-menu a:hover {
    color: var(--accent-green);
    background: rgba(46, 204, 113, 0.15);
    transform: translateY(-1px);
}

.nav-menu a.active {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    font-weight: 600;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

/* Dark Mode Toggle */
.dark-mode-toggle {
    background: none;
    border: 2px solid var(--card-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.dark-mode-toggle:hover {
    background: var(--accent-green);
    border-color: var(--accent-green);
    color: white;
    transform: scale(1.1);
}

/* Sitemap Styles */
.sitemap-section {
    padding: 2rem 0;
    min-height: calc(100vh - 70px);
}

.sitemap-section h1 {
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-size: 2.5rem;
}

.sitemap-grid {
    display: grid;
    gap: 3rem;
    margin: 2rem 0;
}

.sitemap-category {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.sitemap-category h2 {
    color: var(--text-primary);
    border-bottom: 3px solid var(--accent-green);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.sitemap-links {
    display: grid;
    gap: 1.5rem;
}

.sitemap-item {
    border-left: 4px solid var(--accent-green);
    padding-left: 1rem;
}

.sitemap-item h3 {
    margin-bottom: 0.5rem;
}

.sitemap-item h3 a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.3s;
}

.sitemap-item h3 a:hover {
    color: var(--accent-green);
}

.sitemap-item p {
    color: var(--text-muted);
    margin-bottom: 1rem;
    line-height: 1.6;
}

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

.sitemap-item li {
    padding: 0.25rem 0;
    color: var(--text-muted);
    position: relative;
    padding-left: 1rem;
}

.sitemap-item li::before {
    content: "▸";
    color: var(--accent-green);
    position: absolute;
    left: 0;
}

.sitemap-item a {
    color: var(--accent-green);
    text-decoration: none;
}

.sitemap-item a:hover {
    text-decoration: underline;
}

.quick-nav {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 2rem;
    margin: 3rem 0;
    text-align: center;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.quick-nav h2 {
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.quick-nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.quick-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem;
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.quick-nav-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.quick-nav-item .icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.quick-nav-item span:last-child {
    font-weight: 600;
}

.sitemap-footer {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 1.5rem;
    text-align: center;
    margin-top: 3rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.sitemap-footer p {
    margin: 0.5rem 0;
    color: var(--text-secondary);
}

/* Main Content */
main {
    margin-top: 70px;
}

/* Hero Section */
.hero {
    color: var(--text-primary);
    padding: 4rem 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Main Calculator */
.main-calculator {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 2.5rem;
    margin: 2rem auto;
    max-width: 900px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--text-primary);
}

.main-calculator h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-primary);
    font-size: 1.8rem;
}

/* Advanced Options */
.advanced-options {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-left: 4px solid var(--accent-green);
}

/* Newsletter Section */
.newsletter-section {
    padding: 4rem 0;
    background: var(--card-background);
    border-top: 1px solid var(--card-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.newsletter-card {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 3rem;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.newsletter-card h2 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.newsletter-card p {
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.newsletter-form {
    margin-top: 1.5rem;
}

.newsletter-input-group {
    display: flex;
    gap: 1rem;
    max-width: 400px;
    margin: 0 auto;
}

.newsletter-input-group input {
    flex: 1;
    padding: 1rem;
    border: 2px solid var(--card-border);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    font-size: 1rem;
}

.newsletter-input-group input:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.1);
}

.newsletter-input-group button {
    padding: 1rem 1.5rem;
    white-space: nowrap;
}

/* Calculation History */
.calculation-history {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.history-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 1rem;
    transition: all 0.3s ease;
}

.history-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.history-type {
    font-weight: 600;
    color: var(--accent-green);
}

.history-date {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.delete-history {
    background: none;
    border: none;
    color: var(--warning-red);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: background 0.3s ease;
}

.delete-history:hover {
    background: rgba(231, 76, 60, 0.2);
}

.history-details {
    display: flex;
    justify-content: space-between;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Enhanced Form Styles */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

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

.form-group label {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Help Text Styles */
.help-text {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Error Messages */
.error-messages {
    background: rgba(231, 76, 60, 0.1);
    border: 1px solid rgba(231, 76, 60, 0.3);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    color: #e74c3c;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.error-message {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.error-message:last-child {
    margin-bottom: 0;
}

.error-message::before {
    content: "⚠️";
    font-size: 1rem;
}

/* Custom time input styling - 完全隐藏默认时钟图标和提示 */
.form-group input[type="time"] {
    padding: 0.75rem;
    border: 2px solid var(--card-border);
    border-radius: 8px;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    /* 完全隐藏时钟图标以避免中文提示 */
    -webkit-appearance: none;
    -moz-appearance: textfield;
    appearance: none;
}

/* 完全隐藏所有时间选择器相关图标 */
.form-group input[type="time"]::-webkit-calendar-picker-indicator {
    display: none;
    -webkit-appearance: none;
    appearance: none;
}

.form-group input[type="time"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    display: none;
}

.form-group input[type="time"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    display: none;
}

/* 移除任何可能的提示文本 */
.form-group input[type="time"]::-webkit-datetime-edit-text {
    color: var(--text-primary);
}

.form-group input[type="time"]::-webkit-datetime-edit-month-field {
    color: var(--text-primary);
}

.form-group input[type="time"]::-webkit-datetime-edit-day-field {
    color: var(--text-primary);
}

.form-group input[type="time"]::-webkit-datetime-edit-year-field {
    color: var(--text-primary);
}

.form-group input[type="number"],
.form-group select {
    padding: 0.75rem;
    border: 2px solid var(--card-border);
    border-radius: 8px;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.1);
}

.form-group input.error {
    border-color: #e74c3c;
    background-color: rgba(231, 76, 60, 0.05);
    animation: shake 0.3s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.form-group input::placeholder {
    color: var(--text-muted);
    opacity: 0.8;
}

/* Button Loading State */
.btn-primary {
    position: relative;
    overflow: hidden;
}

.btn-loading {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-loading::after {
    content: "";
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.2);
}

.form-group input:hover,
.form-group select:hover {
    border-color: var(--accent-green);
}

/* Unified Button System */
.btn-primary,
.btn-secondary {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    display: inline-block;
    text-align: center;
    font-family: inherit;
}

.btn-primary {
    background: var(--accent-green);
    color: var(--deep-green);
    border: 2px solid var(--accent-green);
    font-weight: 700;
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(46, 204, 113, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--card-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.btn-secondary:hover {
    background: var(--accent-green);
    color: var(--deep-green);
    border-color: var(--accent-green);
    transform: translateY(-2px);
}

/* Result Box */
.result-box {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 1.5rem;
    margin-top: 1.5rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.result-box h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--card-border);
}

.result-item:last-child {
    border-bottom: none;
    font-weight: 700;
    font-size: 1.1rem;
    color: #ffffff;
    background: rgba(46, 204, 113, 0.3);
    padding: 1rem;
    border-radius: 8px;
    border: 2px solid #ffffff;
    margin-top: 0.5rem;
}

/* CTA Section */
.cta-section {
    margin-top: 2rem;
}

/* Features Section */
.features {
    padding: 4rem 0;
}

.features h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all var(--transition-fast);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.2);
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.3rem;
    font-weight: 700;
    line-height: 1.3;
}

.feature-card p {
    color: var(--text-muted);
    line-height: 1.6;
    font-weight: 400;
    opacity: 0.9;
}

.feature-icon {
    width: 120px;
    height: 120px;
    margin-bottom: 1.5rem;
    display: block;
    margin-left: auto;
    margin-right: auto;
    border-radius: 20px;
    object-fit: cover;
    transition: transform 0.3s ease;
    /* 恢复正常显示但优化绿色 */
    filter: saturate(0.6) brightness(1.2) contrast(0.8);
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid var(--card-border);
    padding: 8px;
}

.feature-icon:hover {
    transform: scale(1.05);
    border-color: var(--accent-green);
    filter: saturate(0.8) brightness(1.3) contrast(0.9);
}

/* Tools Section */
.tools-section {
    padding: 4rem 0;
}

.tools-section h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: var(--text-primary);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.tool-card {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    padding: 2rem;
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.2);
}

.tool-card h3 {
    margin-bottom: 1rem;
    color: var(--accent-green);
    font-weight: 700;
    font-size: 1.2rem;
    line-height: 1.3;
}

.tool-card p {
    color: var(--text-muted);
    line-height: 1.6;
    font-weight: 400;
    opacity: 0.9;
}

.tool-icon {
    width: 100px;
    height: 100px;
    margin-bottom: 1.5rem;
    border-radius: 20px;
    object-fit: cover;
    transition: transform 0.3s ease;
    /* 恢复正常显示但优化绿色 */
    filter: saturate(0.6) brightness(1.2) contrast(0.8);
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid var(--card-border);
    padding: 8px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.tool-icon:hover {
    transform: scale(1.05);
    border-color: var(--accent-green);
    filter: saturate(0.8) brightness(1.3) contrast(0.9);
}

/* Calculator Section */
.calculator-section {
    padding: 2rem 0;
    min-height: calc(100vh - 70px);
}

.calculator-section h1 {
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-size: 2.5rem;
}

.subtitle {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.calculator-container {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    max-width: 800px;
    margin: 0 auto;
}

.calc-section {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--card-border);
}

.calc-section:last-of-type {
    border-bottom: none;
}

.calc-section h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.5rem;
}

/* Checkbox Styles */
.checkbox-group {
    margin-bottom: 1rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
}

.checkbox-label input[type="checkbox"] {
    margin-right: 0.5rem;
    transform: scale(1.2);
}

.overtime-options,
.night-options {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    border-left: 4px solid var(--accent-green);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* Detailed Results */
.detailed-result {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid var(--card-border);
}

.detailed-result h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.result-card {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    padding: 1.5rem;
    border-radius: 10px;
    text-align: center;
    border-left: 4px solid var(--accent-green);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.result-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

.result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Salary Breakdown */
.salary-breakdown {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 2rem;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.salary-breakdown h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--card-border);
}

.breakdown-item:last-child {
    border-bottom: none;
}

.breakdown-item.total {
    font-weight: 700;
    font-size: 1.2rem;
    color: #ffffff;
    background: rgba(46, 204, 113, 0.3);
    border: 2px solid #ffffff;
    border-radius: 8px;
    margin-top: 1rem;
    padding: 1rem;
}

.result-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.calc-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

/* Tips Section */
.tips-section {
    padding: 4rem 0;
}

.tips-section h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
    font-size: 2rem;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.tip-card {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all var(--transition-fast);
}

.tip-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.2);
}

.tip-card h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.2rem;
    line-height: 1.3;
}

.tip-card p {
    color: var(--text-muted);
    line-height: 1.6;
    font-weight: 400;
    opacity: 0.9;
}

.tip-icon {
    width: 50px;
    height: 50px;
    margin-bottom: 1rem;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

/* Article Content Components */
blockquote {
    background: var(--background-light);
    border-left: 4px solid var(--primary-blue);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 0 8px 8px 0;
    font-style: italic;
    position: relative;
}

blockquote::before {
    content: '"';
    font-size: 4rem;
    color: var(--primary-blue);
    position: absolute;
    top: -10px;
    left: 10px;
    font-family: Georgia, serif;
}

blockquote p {
    margin: 0;
    padding-left: 2rem;
    color: var(--dark-text);
    line-height: 1.7;
}

.info-box {
    background: var(--background-light);
    border: 2px solid var(--border-light);
    border-radius: 10px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    position: relative;
}

.info-box.formula {
    border-left: 4px solid var(--secondary-purple);
    background: var(--card-background);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.info-box.tip {
    border-left: 4px solid var(--success-green);
}

.info-box.warning {
    border-left: 4px solid var(--warning-red);
}

.info-box h4 {
    color: var(--dark-text);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.info-box p {
    margin: 0;
    color: var(--light-text);
    line-height: 1.6;
}

/* Enhanced Formula Box */
.articles-hero {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--text-primary);
    padding: 3rem 0;
    text-align: center;
    margin: 2rem 0;
    border-radius: 15px;
}

.articles-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.articles-hero p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.articles-grid {
    padding: 3rem 0;
}

.featured-article {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.featured-article h2 {
    color: var(--text-primary);
    font-size: 2rem;
    margin-bottom: 1rem;
}

.article-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.article-meta .category {
    background: var(--accent-green);
    color: var(--deep-green);
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
}

.article-content h3 {
    color: var(--text-primary);
    margin: 1.5rem 0 1rem;
    font-size: 1.3rem;
}

.article-content ul {
    margin: 1rem 0;
    padding-left: 2rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.formula-box {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-left: 4px solid var(--accent-green);
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 5px;
    font-family: 'Courier New', monospace;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: var(--text-primary);
}

.articles-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.article-card {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: transform 0.3s;
}

.article-card:hover {
    transform: translateY(-5px);
}

.article-card h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.article-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.article-details h4 {
    color: var(--accent-green);
    margin: 1rem 0 0.5rem;
    font-size: 1rem;
}

.article-details ul {
    margin: 0;
    padding-left: 1.5rem;
}

.article-details li {
    margin-bottom: 0.3rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.cta-calculator {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 3rem 0;
    text-align: center;
    margin: 3rem 0;
    border-radius: 15px;
}

.cta-calculator h2 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 2rem;
}

.cta-calculator p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

/* Enhanced Footer */
footer {
    background: var(--card-background);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--card-border);
    color: var(--text-primary);
    padding: 3rem 0 1rem;
    position: relative;
    overflow: hidden;
}

/* Brand watermark background */
footer::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Cpath d='M50 10 L35 25 L35 45 L25 45 L25 65 L35 65 L35 85 L50 90 L65 85 L65 65 L75 65 L75 45 L65 45 L65 25 Z' fill='none' stroke='%23ffffff' stroke-width='1' opacity='0.03'/%3E%3Ccircle cx='80' cy='20' r='8' fill='none' stroke='%2327ae60' stroke-width='2' opacity='0.05'/%3E%3Cpath d='M75 18 L78 21 L85 14' stroke='%2327ae60' stroke-width='2' fill='none' opacity='0.05'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    pointer-events: none;
    z-index: 0;
}

footer .container {
    position: relative;
    z-index: 1;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--white);
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--accent-green);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--card-border);
    color: var(--text-secondary);
}

/* Tablet Layout (1024px and below) */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

/* Enhanced Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--card-background);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border: 1px solid var(--card-border);
        box-shadow: 0 2px 10px var(--shadow-light);
        display: none;
    }

    .hero-title {
        font-size: 2.2rem;
        text-align: center;
        line-height: 1.2;
    }

    .hero-subtitle {
        font-size: 1.1rem;
        text-align: center;
        margin-bottom: 2rem;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    /* Enhanced mobile form styles */
    .form-group {
        margin-bottom: 1.5rem;
    }

    .form-group input,
    .form-group select {
        font-size: 16px; /* Prevents zoom on iOS */
        padding: 1.2rem;
        border-radius: 10px;
        border-width: 2px;
        transition: all 0.3s ease;
    }

    .form-group input:focus,
    .form-group select:focus {
        transform: scale(1.02);
        box-shadow: 0 0 0 4px rgba(46, 204, 113, 0.15);
    }

    .form-group label {
        font-size: 1rem;
        font-weight: 600;
        margin-bottom: 0.75rem;
        display: flex;
        align-items: center;
        gap: 0.75rem;
    }

    .btn-primary,
    .btn-secondary {
        padding: 1.2rem 2rem;
        font-size: 1.1rem;
        width: 100%;
        border-radius: 10px;
        font-weight: 600;
        min-height: 52px; /* Better touch target */
    }

    .help-text {
        font-size: 0.85rem;
        line-height: 1.4;
        margin-top: 0.5rem;
    }

    .error-messages {
        font-size: 0.95rem;
        padding: 1rem;
        border-radius: 10px;
        margin: 1rem 0;
    }

    /* Improved result display on mobile */
    .result-box {
        padding: 1.5rem;
        margin-top: 2rem;
        border-radius: 12px;
    }

    .result-item {
        padding: 1rem 0;
        font-size: 1rem;
        border-bottom: 1px solid var(--card-border);
    }

    .result-item:last-child {
        font-size: 1.2rem;
        font-weight: 700;
    }

    /* Feature cards mobile optimization */
    .feature-icon,
    .tool-icon {
        width: 100px;
        height: 100px;
        margin-bottom: 1rem;
    }

    .feature-card {
        padding: 2rem 1.5rem;
        text-align: center;
    }

    .feature-card h3 {
        font-size: 1.3rem;
        margin-bottom: 1rem;
    }

    .feature-card p {
        font-size: 1rem;
        line-height: 1.5;
    }

    .result-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .result-actions,
    .calc-actions {
        flex-direction: column;
        gap: 1rem;
        margin-top: 1.5rem;
    }

    .features-grid,
    .tools-grid,
    .tips-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    /* Mobile logo text adjustments */
    .logo h1 {
        font-size: 1.5rem;
        letter-spacing: 0.06em;
    }

    .container {
        padding: 0 20px;
    }

    .main-calculator,
    .newsletter-card {
        margin: 1rem;
        padding: 2rem;
        border-radius: 15px;
    }

    .newsletter-input-group {
        flex-direction: column;
        gap: 1rem;
    }

    .newsletter-input-group button {
        width: 100%;
        padding: 1rem;
    }

    /* Mobile navigation improvements */
    .nav-container {
        padding: 0 20px;
        height: 70px;
    }

    .nav-menu {
        gap: 1rem;
    }

    .nav-menu a {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
        border-radius: 20px;
    }

    .dark-mode-toggle {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }

    /* Improved mobile forms */
    .main-calculator h2 {
        font-size: 1.5rem;
        margin-bottom: 2rem;
        text-align: center;
    }

    .newsletter-card h2 {
        font-size: 1.4rem;
    }

    .newsletter-card p {
        font-size: 1rem;
    }

    /* Better spacing for mobile */
    .hero {
        padding: 3rem 0;
    }

    .features,
    .tools-section {
        padding: 3rem 0;
    }

    .features h2,
    .tools-section h2 {
        font-size: 2rem;
        margin-bottom: 2rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 1.9rem;
        line-height: 1.2;
        margin-bottom: 1rem;
    }

    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }
    
    .calculator-section {
        padding: 1rem 0;
    }
    
    .nav-container {
        padding: 0 15px;
        height: 65px;
    }
    
    .logo h1 {
        font-size: 1.3rem;
        letter-spacing: 0.05em;
    }

    .logo img {
        width: 45px;
        height: 45px;
    }

    /* Extra small screen form optimizations */
    .main-calculator,
    .newsletter-card {
        padding: 1.5rem;
        margin: 0.5rem;
        border-radius: 12px;
    }

    .main-calculator h2 {
        font-size: 1.3rem;
        margin-bottom: 1.5rem;
    }

    .newsletter-card {
        padding: 2rem 1rem;
    }

    .newsletter-card h2 {
        font-size: 1.2rem;
    }

    .form-group {
        margin-bottom: 1.25rem;
    }

    .form-group input,
    .form-group select {
        padding: 1rem;
        font-size: 16px;
        border-radius: 8px;
    }

    .form-group label {
        font-size: 0.95rem;
        margin-bottom: 0.5rem;
    }

    .btn-primary,
    .btn-secondary {
        padding: 1rem 1.5rem;
        font-size: 1rem;
        min-height: 48px;
        border-radius: 8px;
    }

    /* Improved touch targets for small screens */
    .help-text {
        font-size: 0.8rem;
        line-height: 1.3;
    }

    .error-messages {
        font-size: 0.9rem;
        padding: 0.75rem;
        margin: 0.75rem 0;
    }

    .result-box {
        padding: 1.25rem;
        margin-top: 1.5rem;
        border-radius: 10px;
    }

    .result-item {
        padding: 0.75rem 0;
        font-size: 0.95rem;
    }

    .result-item:last-child {
        font-size: 1.1rem;
    }

    /* Extra small screen optimizations */
    .sitemap-grid {
        gap: 1.5rem;
    }

    .sitemap-category {
        padding: 1.5rem;
    }

    .container {
        padding: 0 15px;
    }

    /* Feature cards for very small screens */
    .feature-card {
        padding: 1.5rem 1rem;
    }

    .feature-card h3 {
        font-size: 1.2rem;
    }

    .feature-card p {
        font-size: 0.95rem;
    }

    .feature-icon,
    .tool-icon {
        width: 80px;
        height: 80px;
    }

    /* Typography adjustments for small screens */
    .features h2,
    .tools-section h2 {
        font-size: 1.8rem;
        margin-bottom: 1.5rem;
    }

    .nav-menu {
        gap: 0.5rem;
    }
    
    .nav-menu a {
        padding: 0.5rem 0.8rem;
        font-size: 0.85rem;
        border-radius: 18px;
    }

    .dark-mode-toggle {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
    }

    /* Share modal mobile optimization */
    .share-options {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }
    
    .share-btn {
        padding: 0.75rem 0.5rem;
        font-size: 0.9rem;
    }
    
    .share-modal-content {
        width: 95%;
        padding: 1.5rem;
    }
}

/* Notification Styles */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    color: var(--text-primary);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 10000;
    transform: translateX(400px);
    opacity: 0;
    transition: all 0.3s ease;
    max-width: 300px;
}

.notification.show {
    transform: translateX(0);
    opacity: 1;
}

.notification.success {
    border-left: 4px solid var(--accent-green);
}

.notification.error {
    border-left: 4px solid var(--warning-red);
}

.notification.info {
    border-left: 4px solid var(--primary-blue);
}

/* Share Modal Styles */
.share-modal {
    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: 10000;
    backdrop-filter: blur(4px);
}

.share-modal-content {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.share-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.share-modal-header h3 {
    color: var(--text-primary);
    margin: 0;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.close-modal:hover {
    background: var(--accent-green);
    color: white;
}

.share-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.share-btn {
    padding: 0.75rem 1rem;
    border: 1px solid var(--card-border);
    border-radius: 8px;
    background: var(--card-background);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.share-btn:hover {
    background: var(--accent-green);
    color: white;
    border-color: var(--accent-green);
    transform: translateY(-2px);
}

.share-preview {
    background: var(--card-background);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 1rem;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.share-preview h4 {
    color: var(--text-primary);
    margin: 0 0 0.5rem 0;
    font-size: 0.9rem;
}

.share-preview pre {
    color: var(--text-secondary);
    margin: 0;
    white-space: pre-wrap;
    font-size: 0.8rem;
    line-height: 1.4;
}