/* 
 * International College Landing Page Styles
 * Modern, elegant design with Chinese/Global aesthetic
 */

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

:root {
    /* Color Palette - Royal Blue & Gold */
    --primary: #1a365d;
    --primary-light: #2c5282;
    --primary-dark: #0f2442;
    --accent: #c9a227;
    --accent-light: #d4b84a;
    --accent-dark: #a88620;
    --white: #ffffff;
    --off-white: #f7f9fc;
    --gray-100: #edf2f7;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e0;
    --gray-400: #a0aec0;
    --gray-500: #718096;
    --gray-600: #4a5568;
    --gray-700: #2d3748;
    --gray-800: #1a202c;
    --success: #38a169;
    --error: #e53e3e;

    /* Typography */
    --font-display: 'Playfair Display', 'Noto Serif SC', serif;
    --font-body: 'Source Sans Pro', 'Noto Sans SC', sans-serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--gray-700);
    line-height: 1.6;
    background-color: var(--white);
    overflow-x: hidden;
}

/* Chinese Language Specific */
body.lang-zh {
    font-family: 'Noto Sans SC', 'Source Sans Pro', sans-serif;
}

body.lang-zh h1,
body.lang-zh h2,
body.lang-zh h3 {
    font-family: 'Noto Serif SC', 'Playfair Display', serif;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.3;
    color: var(--gray-800);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
    margin-bottom: var(--spacing-md);
}

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

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

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-3xl) 0;
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo img {
    height: 50px;
    width: auto;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-text .university {
    font-size: 0.75rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.logo-text .college {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
}

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

.nav-links a {
    font-weight: 500;
    color: var(--gray-600);
    padding: var(--spacing-sm) 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition-normal);
}

.nav-links a:hover::after {
    width: 100%;
}

.lang-switch {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--gray-100);
    border-radius: 50px;
    padding: 4px;
}

.lang-btn {
    padding: 6px 16px;
    border-radius: 50px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-weight: 500;
    color: var(--gray-600);
    transition: all var(--transition-fast);
    font-size: 0.875rem;
}

.lang-btn.active {
    background: var(--white);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--white);
    max-width: 800px;
    padding: var(--spacing-xl);
}

.hero-badge {
    display: inline-block;
    background: rgba(201, 162, 39, 0.2);
    border: 1px solid var(--accent);
    color: var(--accent-light);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease;
}

.hero h1 {
    color: var(--white);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--accent);
    color: var(--white);
    padding: 16px 40px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.125rem;
    transition: all var(--transition-normal);
    animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-cta:hover {
    background: var(--accent-light);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(201, 162, 39, 0.4);
}

.hero-cta svg {
    transition: transform var(--transition-fast);
}

.hero-cta:hover svg {
    transform: translateX(5px);
}

/* Decorative Elements */
.hero-decoration {
    position: absolute;
    opacity: 0.1;
}

.hero-decoration.circle-1 {
    width: 400px;
    height: 400px;
    border: 2px solid var(--accent);
    border-radius: 50%;
    top: -100px;
    right: -100px;
    animation: rotate 30s linear infinite;
}

.hero-decoration.circle-2 {
    width: 600px;
    height: 600px;
    border: 1px solid var(--white);
    border-radius: 50%;
    bottom: -200px;
    left: -200px;
    animation: rotate 40s linear infinite reverse;
}

/* Features Section */
.features {
    background: var(--off-white);
}

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

.feature-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
}

.feature-icon svg {
    width: 35px;
    height: 35px;
    color: var(--white);
}

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--gray-500);
    margin-bottom: 0;
}

/* Registration Form Section */
.registration {
    position: relative;
    background: var(--white);
}

.registration-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.registration-info {
    padding-right: var(--spacing-xl);
}

.registration-info h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--primary);
}

.registration-info p {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
}

.info-list {
    list-style: none;
}

.info-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    color: var(--gray-600);
}

.info-list li svg {
    color: var(--accent);
    flex-shrink: 0;
    margin-top: 3px;
}

/* Form Styles */
.form-card {
    background: var(--white);
    border-radius: 24px;
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--gray-200);
}

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

.form-header h3 {
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.form-header p {
    color: var(--gray-500);
    margin-bottom: 0;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

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

.form-label {
    display: block;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
}

.form-label .required {
    color: var(--error);
}

.form-input,
.form-select {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--gray-200);
    border-radius: 12px;
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
    background: var(--white);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(26, 54, 93, 0.1);
}

.form-input::placeholder {
    color: var(--gray-400);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23718096' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
    padding-right: 45px;
    cursor: pointer;
}

.form-error {
    color: var(--error);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    display: none;
}

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

.form-group.error .form-error {
    display: block;
}

.submit-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    border: none;
    border-radius: 12px;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(26, 54, 93, 0.3);
}

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.submit-btn .spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
}

.submit-btn.loading .spinner {
    display: block;
}

.submit-btn.loading .btn-text {
    display: none;
}

/* Success Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--white);
    border-radius: 24px;
    padding: var(--spacing-2xl);
    max-width: 400px;
    width: 90%;
    text-align: center;
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--success), #48bb78);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
}

.modal-icon svg {
    width: 40px;
    height: 40px;
    color: var(--white);
}

.modal h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--gray-800);
}

.modal p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
}

.modal-btn {
    padding: 12px 30px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-btn:hover {
    background: var(--primary-light);
}

/* Footer */
.footer {
    background: var(--gray-800);
    color: var(--gray-300);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

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

.footer-brand .logo-text .university {
    color: var(--gray-400);
}

.footer-brand .logo-text .college {
    color: var(--white);
}

.footer-brand p {
    margin-top: var(--spacing-md);
    color: var(--gray-400);
    line-height: 1.7;
}

.footer h4 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--gray-400);
}

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

.footer-contact p {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--gray-400);
}

.footer-contact svg {
    flex-shrink: 0;
    margin-top: 3px;
    color: var(--accent);
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--gray-700);
    text-align: center;
    color: var(--gray-500);
    font-size: 0.875rem;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

    to {
        transform: rotate(360deg);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .registration-wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .registration-info {
        padding-right: 0;
        text-align: center;
    }

    .info-list {
        max-width: 400px;
        margin: 0 auto;
        text-align: left;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        box-shadow: var(--shadow-lg);
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .lang-switch {
        position: absolute;
        top: 100%;
        right: var(--spacing-lg);
        margin-top: var(--spacing-md);
    }

    .nav-links.active~.lang-switch {
        display: flex;
    }

    .hero {
        min-height: auto;
        padding: 120px 0 80px;
    }

    .hero-content {
        padding: var(--spacing-md);
    }

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

    .form-card {
        padding: var(--spacing-lg);
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-contact p {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .hero-cta {
        padding: 14px 30px;
        font-size: 1rem;
    }

    .section {
        padding: var(--spacing-2xl) 0;
    }
}

/* Print Styles */
@media print {

    .header,
    .footer,
    .hero-cta,
    .submit-btn {
        display: none;
    }

    .hero {
        min-height: auto;
        padding: var(--spacing-xl);
        background: none;
        color: var(--gray-800);
    }

    .hero h1 {
        color: var(--gray-800);
    }
}