/* EduConsult Hub - Main Stylesheet */

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

:root {
    /* Color Scheme */
    --primary-blue: #165DFF;
    --accent-orange: #FF7D00;
    --light-gray: #F5F7FA;
    --dark-gray: #333333;
    --title-gray: #1D2129;
    --white: #FFFFFF;
    --shadow: rgba(0, 0, 0, 0.1);
    --hover-shadow: rgba(0, 0, 0, 0.15);
    
    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Open Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

body {
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--white);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--title-gray);
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 24px; }
h2 { font-size: 20px; }
h3 { font-size: 18px; }
h4 { font-size: 16px; }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--dark-gray);
}

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

a:hover {
    color: var(--accent-orange);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header and Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: transparent;
    z-index: 1000;
    transition: var(--transition-medium);
}

.header.scrolled {
    background: var(--white);
    box-shadow: 0 2px 10px var(--shadow);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-right: auto;
}

.nav-menu-container {
        display: flex;
        align-items: center;
        position: relative;
    }
    
    @media (max-width: 767px) {
        .nav-menu-container {
            margin-left: auto;
        }
    }

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

.nav-link {
    font-weight: 500;
    color: var(--title-gray);
    position: relative;
    padding: var(--spacing-xs) 0;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent-orange);
    border-radius: 2px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.search-box {
    position: relative;
}

.search-input {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid #ddd;
    border-radius: var(--radius-sm);
    font-size: 14px;
    width: 200px;
    transition: var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(22, 93, 255, 0.1);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-fast);
    min-width: 120px;
}

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

.btn-primary:hover {
    background: #e66d00;
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 125, 0, 0.3);
}

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

.btn-secondary:hover {
    background: #1450d9;
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(22, 93, 255, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-outline:hover {
    background: var(--primary-blue);
    color: var(--white);
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px var(--shadow);
    padding: var(--spacing-lg);
    transition: var(--transition-medium);
    margin-bottom: var(--spacing-md);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--hover-shadow);
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.card-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-blue);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--spacing-md);
    color: var(--white);
    font-size: 20px;
}

.card-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--title-gray);
    margin-bottom: var(--spacing-xs);
}

.card-description {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-md);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    color: var(--dark-gray);
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-video-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.3);
    z-index: 2;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(0,0,0,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.2;
    z-index: 3;
}

.hero-content {
    position: relative;
    z-index: 4;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--dark-gray);
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: var(--spacing-xl);
    color: var(--dark-gray);
    opacity: 0.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xxl);
    margin-top: var(--spacing-xl);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--accent-orange);
    display: block;
}

.stat-label {
    font-size: 14px;
    color: var(--dark-gray);
    opacity: 0.7;
}

/* Carousel */
.carousel {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px var(--shadow);
}

.carousel-inner {
    display: flex;
    transition: transform var(--transition-medium);
}

.carousel-item {
    min-width: 100%;
    position: relative;
}

.carousel-item img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.carousel-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: var(--white);
    padding: var(--spacing-xxl) var(--spacing-xl) var(--spacing-lg);
}

.carousel-controls {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
}

.carousel-btn {
    background: rgba(255, 255, 255, 0.9);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: var(--transition-fast);
}

.carousel-btn:hover {
    background: var(--white);
    transform: scale(1.1);
}

.carousel-indicators {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-xs);
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: var(--transition-fast);
}

.indicator.active {
    background: var(--accent-orange);
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

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

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

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--title-gray);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 14px;
    transition: var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(22, 93, 255, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* Tags and Labels */
.tag {
    display: inline-block;
    padding: 4px 8px;
    background: var(--light-gray);
    color: var(--dark-gray);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    margin-right: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}

.tag-hot {
    background: #ff4757;
    color: var(--white);
}

.tag-popular {
    background: #3742fa;
    color: var(--white);
}

.tag-new {
    background: #2ed573;
    color: var(--white);
}

/* Section Styling */
.section {
    padding: var(--spacing-xxl) 0;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--title-gray);
}

.section-subtitle {
    font-size: 18px;
    text-align: center;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-xxl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--primary-blue);
    color: var(--white);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 4px 12px var(--shadow);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-medium);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--accent-orange);
    transform: translateY(-2px);
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--light-gray);
    border-radius: 50%;
    border-top-color: var(--primary-blue);
    animation: spin 1s ease-in-out infinite;
}

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

/* Footer */
.footer {
    background: var(--title-gray);
    color: var(--white);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

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

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

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* Responsive Design */

/* Large Desktop (≥1200px) - Default styles */

/* Medium Desktop (1024-1199px) */
@media (max-width: 1199px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .grid-4 {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-stats {
        gap: var(--spacing-lg);
    }
    
    .nav-menu {
        gap: var(--spacing-md);
    }
    
    .search-input {
        width: 160px;
    }
    
    .hero-content {
        padding: 0 var(--spacing-sm);
    }
    
    .service-card {
        padding: var(--spacing-md);
    }
    
    .expert-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Tablet (768-1023px) */
@media (max-width: 1023px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .nav-menu {
        gap: var(--spacing-sm);
    }
    
    .nav-link {
        font-size: 14px;
    }
    
    .search-input {
        width: 140px;
    }
    
    .expert-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .service-card {
        padding: var(--spacing-sm);
    }
    
    .card-title {
        font-size: 16px;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
}

/* Mobile (≤767px) */
@media (max-width: 767px) {
    .nav-menu {
        display: flex;
        position: fixed;
        top: 0;
        left: 0;
        width: 80%;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 100px 30px 30px;
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
        z-index: 998;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        overflow-y: auto;
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-menu li {
        width: 100%;
        margin-bottom: 15px;
    }
    
    .nav-link {
        padding: 15px 20px;
        border-radius: 8px;
        width: 100%;
        display: block;
        font-size: 16px;
        font-weight: 500;
        transition: all 0.3s ease;
    }
    
    .mobile-menu-toggle {
        display: none;
        background: none;
        border: none;
        cursor: pointer;
        padding: var(--spacing-xs);
        width: 30px;
        height: 25px;
        position: relative;
        z-index: 1001;
    }
    
    @media (max-width: 767px) {
        .mobile-menu-toggle {
            display: block;
        }
    }
    
    .mobile-menu-toggle span {
        display: block;
        width: 100%;
        height: 3px;
        background: var(--title-gray);
        margin-bottom: 5px;
        transition: all 0.3s ease;
        border-radius: 2px;
    }
    
    .mobile-menu-toggle span:last-child {
        margin-bottom: 0;
    }
    
    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
        background: var(--primary-blue);
    }
    
    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
        background: var(--primary-blue);
    }
    
    .mobile-menu-toggle.active {
        color: var(--primary-blue);
    }
    
    .search-box {
        display: none;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 15px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .stat-item {
        margin-bottom: var(--spacing-sm);
    }
    
    /* Mobile grid layout - 2 columns for cards */
    .grid-2,
    .grid-3,
    .grid-4,
    .experts-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
        padding: 0 10px;
    }
    
    /* Card image optimization for mobile */
    .service-card img,
    .card img,
    .expert-card img {
        height: 120px;
        object-fit: cover;
    }
    
    /* Card content optimization */
    .service-card,
    .card,
    .expert-card {
        padding: 1rem;
    }
    
    .card-title,
    .service-card h3,
    .expert-card h3 {
        font-size: 0.9rem;
        margin-bottom: 0.5rem;
    }
    
    .card-description,
    .service-card p,
    .expert-card p {
        font-size: 0.8rem;
        line-height: 1.4;
        margin-bottom: 0.8rem;
    }
    
    .card-meta,
    .service-card .meta,
    .expert-card .meta {
        font-size: 0.75rem;
        color: #6b7280;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .btn {
        min-width: 100px;
        padding: 14px 20px;
        font-size: 15px;
        width: 100%;
        max-width: 300px;
    }
    
    .btn-group {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
    
    .section-title {
        font-size: 24px;
        margin-bottom: var(--spacing-md);
    }
    
    .section-subtitle {
        font-size: 16px;
        margin-bottom: var(--spacing-lg);
    }
    
    .container {
        padding: 0 var(--spacing-xs);
    }
    
    .card {
        margin-bottom: var(--spacing-md);
    }
    
    .expert-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonial-card {
        padding: var(--spacing-md);
    }
    
    .newsletter-form {
        flex-direction: column;
    }
    
    .form-group {
        margin-bottom: var(--spacing-sm);
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
}

/* Small Mobile (≤480px) */
@media (max-width: 480px) {
    .hero-title {
        font-size: 24px;
    }
    
    .hero-subtitle {
        font-size: 14px;
    }
    
    .section-title {
        font-size: 20px;
    }
    
    .btn {
        padding: 12px 16px;
        font-size: 14px;
    }
    
    .logo {
        font-size: 20px;
    }
    
    .nav {
        padding: var(--spacing-sm) 0;
    }
    
    /* Smaller mobile grid layout */
    .grid-2,
    .grid-3,
    .grid-4,
    .experts-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.8rem;
        padding: 0 8px;
    }
    
    /* Further card optimization for small screens */
    .service-card img,
    .card img,
    .expert-card img {
        height: 100px;
    }
    
    .service-card,
    .card,
    .expert-card {
        padding: 0.8rem;
    }
    
    .card-title,
    .service-card h3,
    .expert-card h3 {
        font-size: 0.85rem;
        margin-bottom: 0.4rem;
    }
    
    .card-description,
    .service-card p,
    .expert-card p {
        font-size: 0.75rem;
        line-height: 1.3;
        margin-bottom: 0.6rem;
    }
    
    .card-meta,
    .service-card .meta,
    .expert-card .meta {
        font-size: 0.7rem;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-content {
        padding: 0 var(--spacing-xs);
    }
    
    .service-card,
    .expert-card,
    .testimonial-card {
        padding: var(--spacing-sm);
    }
    
    .card-title {
        font-size: 15px;
    }
    
    .card-description {
        font-size: 13px;
    }
    
    .footer-section h3 {
        font-size: 16px;
    }
    
    .footer-section a {
        font-size: 13px;
    }
    
    .modal-content {
        margin: 10% var(--spacing-xs);
        padding: var(--spacing-md);
    }
    
    .modal-title {
        font-size: 18px;
    }
    
    /* 移动端表单优化 */
    .form-row {
        grid-template-columns: 1fr !important;
        gap: var(--spacing-sm);
    }
    
    .form-group {
        margin-bottom: var(--spacing-sm);
    }
    
    .form-control {
        font-size: 16px; /* 防止iOS缩放 */
        padding: 10px 12px;
    }
    
    .contact-method {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .contact-icon {
        margin: 0 auto var(--spacing-sm);
    }
    
    .contact-details h3 {
        font-size: 16px;
    }
    
    .contact-details p {
        font-size: 14px;
    }
    
    /* 服务卡片移动端优化 */
    .service-detail-card {
        padding: var(--spacing-sm);
    }
    
    .service-header {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .service-actions {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .service-actions .btn {
        width: 100%;
        max-width: none;
    }
    
    /* 专家卡片移动端优化 */
    .expert-card {
        padding: var(--spacing-sm);
    }
    
    .expert-credentials {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .expert-specialties {
        flex-wrap: wrap;
    }
    
    .specialty-tag {
        font-size: 12px;
        padding: 4px 8px;
    }
    
    /* 案例卡片移动端优化 */
    .case-card {
        padding: var(--spacing-sm);
    }
    
    .case-header {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .student-avatar {
        margin: 0 auto;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    /* 按钮组移动端优化 */
    .btn-group {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-group .btn {
        width: 100%;
        margin-bottom: var(--spacing-sm);
    }
    
    .btn-group .btn:last-child {
        margin-bottom: 0;
    }
    
    /* 表格移动端优化 */
    .table-responsive {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    table {
        font-size: 14px;
    }
    
    /* 地图移动端优化 */
    .map-container iframe {
        height: 250px;
    }
    
    .map-info {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .hero-bg {
        background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><rect fill="%23f5f7fa" width="1200" height="600"/><path fill="%23e8ecf1" d="M0 300L50 325L100 300L150 275L200 300L250 325L300 300L350 275L400 300L450 325L500 300L550 275L600 300L650 325L700 300L750 275L800 300L850 325L900 300L950 275L1000 300L1050 325L1100 300L1150 275L1200 300V600H0V300Z"/></svg>');
    }
}

/* Touch-friendly interactions */
@media (hover: none) and (pointer: coarse) {
    .btn:hover {
        transform: none;
    }
    
    .btn:active {
        transform: scale(0.98);
    }
    
    .card:hover {
        transform: none;
    }
    
    .card:active {
        transform: scale(0.98);
    }
    
    .nav-link:hover {
        background: rgba(22, 93, 255, 0.1);
        border-radius: var(--radius-sm);
    }
}

/* Responsive images */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Responsive typography */
html {
    font-size: 16px;
}

@media (max-width: 767px) {
    html {
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 13px;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus styles for accessibility */
.btn:focus,
.nav-link:focus,
.form-input:focus,
.search-input:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Enhanced Interactive Elements */

/* Ripple Effect for Buttons */
.ripple {
    position: absolute;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.6);
    transform: scale(0);
    animation: ripple-animation 0.6s linear;
    pointer-events: none;
}

@keyframes ripple-animation {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Enhanced Back to Top Button */
.back-to-top {
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Password Strength Indicator */
.password-strength {
    margin-top: 8px;
    font-size: 12px;
}

.strength-bar {
    width: 100%;
    height: 4px;
    background-color: #e0e0e0;
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 4px;
}

.strength-fill {
    height: 100%;
    transition: width 0.3s ease, background-color 0.3s ease;
    border-radius: 2px;
}

.strength-text {
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Loading States */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    text-align: center;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #165dff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-state p {
    color: #666;
    font-size: 14px;
    margin: 0;
}

/* Enhanced Form Validation */
.form-group {
    position: relative;
    margin-bottom: 24px;
}

.form-field-error {
    position: absolute;
    bottom: -20px;
    left: 0;
    font-size: 12px;
    color: #ff4757;
    background-color: rgba(255, 71, 87, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
    opacity: 0;
    transform: translateY(-5px);
    transition: all 0.3s ease;
}

.form-field-error.show {
    opacity: 1;
    transform: translateY(0);
}

.form-input.error,
.form-textarea.error,
.form-select.error {
    border-color: #ff4757;
    background-color: rgba(255, 71, 87, 0.05);
}

.form-input.success,
.form-textarea.success,
.form-select.success {
    border-color: #2ed573;
    background-color: rgba(46, 213, 115, 0.05);
}

/* Enhanced Service Card Hover Effects */
.service-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.service-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(22, 93, 255, 0.15);
}

/* Enhanced Button Hover Effects */
.btn {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(22, 93, 255, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 117, 125, 0.3);
}

/* Smooth Scrolling Enhancement */
html {
    scroll-behavior: smooth;
}

/* Enhanced Focus Styles for Accessibility */
.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: #165dff;
    box-shadow: 0 0 0 3px rgba(22, 93, 255, 0.1);
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(22, 93, 255, 0.3);
}

/* Enhanced Loading Animation */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(5px);
}

.loading-content {
    text-align: center;
}

.loading-spinner-enhanced {
    width: 60px;
    height: 60px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #165dff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

.loading-text {
    font-size: 16px;
    color: #333;
    font-weight: 500;
}

/* Enhanced Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Animation Classes */
.animate-fadeInUp {
    animation: fadeInUp 0.6s ease-out;
}

.animate-fadeInLeft {
    animation: fadeInLeft 0.6s ease-out;
}

.animate-fadeInRight {
    animation: fadeInRight 0.6s ease-out;
}

/* Enhanced Scroll Animations */
@media (prefers-reduced-motion: no-preference) {
    .scroll-animate {
        opacity: 0;
        transform: translateY(30px);
        transition: all 0.6s ease-out;
    }
    
    .scroll-animate.visible {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.hidden { display: none; }
.visible { display: block; }

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition-medium);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}