/* ===================================
   DESIGN SYSTEM - UNIVERSITY ADMISSIONS
   Primary Color: Blue (#1E5AA8) -> Modern Indigo
   =================================== */

/* === CSS VARIABLES === */
:root {
    /* Brand Colors */
    --primary-color: #4338CA;
    /* Indigo 700 */
    --primary-light: #6366F1;
    /* Indigo 500 */
    --primary-dark: #312E81;
    /* Indigo 900 */
    --secondary-color: #F59E0B;
    /* Amber 500 */
    --accent-color: #F87171;
    /* Red 400 */

    /* Neutrals */
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #4338CA 0%, #6366F1 100%);
    --gradient-hero: linear-gradient(135deg, #312E81 0%, #4338CA 50%, #6366F1 100%);
    --gradient-accent: linear-gradient(135deg, #F59E0B 0%, #FBBF24 100%);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-heading: 'Roboto', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    /* 8px */
    --spacing-sm: 1rem;
    /* 16px */
    --spacing-md: 1.5rem;
    /* 24px */
    --spacing-lg: 2rem;
    /* 32px */
    --spacing-xl: 4rem;
    /* 64px */

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* === RESET & BASE === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-sans);
    color: var(--gray-700);
    line-height: 1.6;
    background-color: var(--gray-50);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* === TYPOGRAPHY === */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--gray-900);
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: 1.25rem;
}

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

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

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

.text-primary {
    color: var(--primary-color) !important;
}

.text-white {
    color: var(--white) !important;
}

.bg-gray {
    background-color: var(--gray-50);
    background-image: radial-gradient(#E5E7EB 1px, transparent 1px);
    background-size: 20px 20px;
}

.bg-white {
    background-color: var(--white);
}

/* === ANIMATIONS === */
@keyframes pulse-action {
    0% {
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.4);
    }

    70% {
        box-shadow: 0 0 0 10px rgba(99, 102, 241, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0);
    }
}

@keyframes shine {
    100% {
        left: 125%;
    }
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* === BUTTONS === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: 50px;
    /* Pillow shape for modern look */
    font-weight: 700;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: var(--gradient-primary);
    background-size: 200% auto;
    color: var(--white);
    box-shadow: 0 4px 15px rgba(67, 56, 202, 0.4);
    z-index: 1;
}

.btn-primary::after {
    content: '';
    position: absolute;
    top: 0;
    left: -75%;
    width: 50%;
    height: 100%;
    background: linear-gradient(to right, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.3) 100%);
    transform: skewX(-25deg);
    z-index: -1;
    animation: shine 3s infinite;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 25px rgba(67, 56, 202, 0.5);
    background-position: right center;
}

/* Key CTA Button Pulse Effect */
.btn-primary.pulse {
    animation: pulse-action 2s infinite;
}

.btn-outline {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.8);
    color: var(--white);
    backdrop-filter: blur(5px);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--primary-color);
    border-color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.btn-block {
    width: 100%;
    border-radius: var(--radius-md);
    /* Keep block buttons slightly more square */
}

/* === HEADER === */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-top {
    background: var(--gray-900);
    color: var(--gray-300);
    font-size: 0.875rem;
    padding: 0.5rem 0;
}

.header-top .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-main .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    font-weight: 500;
    color: var(--gray-700);
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s;
}

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

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-800);
}

/* === HERO SECTION === */
.hero {
    background: var(--gradient-hero);
    color: var(--white);
    padding: var(--spacing-xl) 0;
    position: relative;
    overflow: hidden;
}

/* Abstract Background Shapes */
.hero::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-tag {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.hero p {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
}

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

.hero-feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

/* Registration Form in Hero */
.registration-form {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    color: var(--gray-800);
}

.registration-form h3 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--gray-700);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 56, 202, 0.1);
}

/* === STATS SECTION === */
.stats {
    margin-top: -2rem;
    padding-bottom: 4rem;
    position: relative;
    z-index: 10;
}

.stats .container {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    text-align: center;
}

.stat-item {
    padding: 1rem;
    border-right: 1px solid var(--gray-200);
}

.stat-item:last-child {
    border-right: none;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    color: var(--gray-600);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* === SECTIONS === */
section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

.section-header h2 {
    color: var(--primary-dark);
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--secondary-color);
    margin: 0.5rem auto 0;
    border-radius: var(--radius-full);
}

/* === CARDS === */
.card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 1px solid var(--gray-100);
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: var(--gray-100);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    transition: all 0.3s;
}

.card:hover .card-icon {
    background: var(--primary-color);
    color: var(--white);
}

.card h4 {
    margin-bottom: 1rem;
}

.card p {
    color: var(--gray-600);
    flex-grow: 1;
    /* Push button to bottom */
}

/* === TIMELINE / PROCESS === */
.timeline {
    position: relative;
    padding-left: 2rem;
}

/* Gradient Vertical Line */
.timeline::before {
    content: '';
    position: absolute;
    left: 19px;
    top: 0;
    height: 100%;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.timeline-item {
    display: flex;
    justify-content: flex-start;
    align-items: flex-start;
    margin-bottom: 2.5rem;
    position: relative;
    gap: 1.5rem;
    cursor: default;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-item:nth-child(even) {
    flex-direction: row;
}

/* Number Node with Pulse */
.timeline-number {
    position: relative;
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    border: 3px solid var(--white);
    box-shadow: 0 0 0 4px rgba(67, 56, 202, 0.1);
    z-index: 2;
    flex-shrink: 0;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.timeline-item:hover .timeline-number {
    transform: scale(1.2);
    box-shadow: 0 0 0 6px rgba(67, 56, 202, 0.2);
    background: var(--gradient-accent);
}

/* Content Box with Hover Lift */
.timeline-content {
    width: 100%;
    padding: 1.5rem;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid transparent;
    position: relative;
}

/* Connector Arrow */
.timeline-content::before {
    content: '';
    position: absolute;
    left: -8px;
    top: 20px;
    width: 16px;
    height: 16px;
    background: var(--white);
    transform: rotate(45deg);
    border-left: 1px solid transparent;
    /* Match border if needed */
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.timeline-item:hover .timeline-content {
    transform: translateX(10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.timeline-item:hover .timeline-content::before {
    border-color: var(--primary-light);
}

.timeline-content h4 {
    margin-bottom: 0.5rem;
    transition: color 0.3s;
}

.timeline-item:hover h4 {
    color: var(--primary-color);
}

/* === FOOTER === */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding-top: 4rem;
    padding-bottom: 2rem;
}

.footer h3 {
    color: var(--white);
    margin-bottom: 0.5rem;
}

.footer h4 {
    color: var(--white);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

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

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

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

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s;
}

.social-links a:hover {
    background: var(--primary-color);
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: 2rem;
    text-align: center;
    font-size: 0.9rem;
}

/* === RESPONSIVE === */
@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-features {
        justify-content: center;
    }

    .registration-form {
        max-width: 500px;
        margin: 0 auto;
    }

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

    .stat-item:nth-child(2) {
        border-right: none;
    }

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

    .mobile-menu-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        transition: transform 0.3s;
        gap: 1rem;
    }

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

@media (max-width: 576px) {
    h1 {
        font-size: 2rem;
    }

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

    .hero {
        padding: 3rem 0;
    }

    .stats .container {
        grid-template-columns: 1fr;
    }

    .stat-item {
        border-right: none;
        border-bottom: 1px solid var(--gray-200);
    }

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

    .footer-content {
        grid-template-columns: 1fr;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-number {
        left: 20px;
    }

    .timeline-item,
    .timeline-item:nth-child(even) {
        flex-direction: column;
        padding-left: 50px;
    }

    .timeline-content {
        width: 100%;
    }
}