/* ============================================
   CAMPUS PREMIUM — GOOGLE MODEL (INTERN STYLE)
   ============================================ */

:root {
    --google-blue: #4285F4;
    --google-blue-hover: #1A73E8;
    --google-red: #EA4335;
    --google-yellow: #FBBC04;
    --google-green: #34A853;

    --text-primary: #202124;
    --text-secondary: #5F6368;
    --surface: #FFFFFF;
    --background: #F8F9FA;

    --font-brand: 'Google Sans', 'Plus Jakarta Sans', sans-serif;
    --font-plain: 'Roboto', 'Inter', sans-serif;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-pill: 100px;

    --shadow-sm: 0 1px 2px 0 rgba(60,64,67,.30), 0 1px 3px 1px rgba(60,64,67,.15);
    --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);
    
    --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: var(--surface);
    color: var(--text-primary);
    font-family: var(--font-plain);
    -webkit-font-smoothing: antialiased;
    line-height: 1.5;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4, .font-brand {
    font-family: var(--font-brand);
    font-weight: 500;
}

.text-gradient {
    color: var(--google-blue);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-pill);
    font-family: var(--font-brand);
    font-weight: 500;
    font-size: 15px;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
    border: none;
}

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

.btn-primary:hover {
    background: var(--google-blue-hover);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background: white;
    color: var(--google-blue);
    border: 1px solid #DADCE0;
}

.btn-secondary:hover {
    background: #F8F9FA;
    border-color: #D2D4D7;
}

.btn-large {
    padding: 16px 36px;
    font-size: 17px;
}

/* Navbar */
.top-nav {
    height: 64px;
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid rgba(0,0,0,0.06);
}

.nav-container {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-brand);
    font-size: 20px;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon {
    color: var(--google-blue);
    font-size: 28px;
}

.nav-links {
    display: flex;
    gap: 8px;
    align-items: center;
}

@media (max-width: 480px) {
    .nav-links .btn {
        padding: 8px 16px;
        font-size: 13px;
    }
    .logo span { font-size: 18px; }
}

/* Hero Section */
.hero-section {
    padding: 160px 0 100px;
    background: white;
    background-image: 
        radial-gradient(at 0% 0%, rgba(66,133,244,0.1) 0, transparent 50%),
        radial-gradient(at 100% 0%, rgba(52,168,83,0.05) 0, transparent 50%);
    text-align: center;
}

.hero-title {
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 700;
    color: #202124;
    letter-spacing: -0.01em;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 20px;
    color: #5F6368;
    max-width: 800px;
    margin: 0 auto 48px;
    line-height: 1.6;
}

.hero-cta-group {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 80px;
}

/* Stats Card */
.hero-stats-card {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 48px;
    background: white;
    padding: 24px 48px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid #EAEAEA;
    width: fit-content;
    max-width: 100%;
    margin: 0 auto;
}

.stat-item { text-align: center; }
.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--google-blue);
    margin-bottom: 4px;
}
.stat-label {
    font-size: 13px;
    font-weight: 500;
    color: #70757A;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-divider {
    width: 1px;
    height: 50px;
    background: #EAEAEA;
}

/* Content Sections */
section { padding: 100px 0; }

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header h2 {
    font-size: 42px;
    margin-bottom: 16px;
    color: #202124;
}

.section-header p {
    font-size: 18px;
    color: #5F6368;
}

/* Platforms Grid */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.platform-card {
    padding: 40px;
    border-radius: var(--radius-xl);
    background: white;
    border: 1px solid #DADCE0;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
}

.platform-card:hover {
    border-color: var(--google-blue);
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px);
}

.card-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.card-icon span { font-size: 32px; }

.platform-card h3 {
    font-size: 22px;
    margin-bottom: 16px;
    color: #202124;
}

.platform-card p {
    color: #5F6368;
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 24px;
    flex-grow: 1;
}

.btn-arrow {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--google-blue);
    font-family: var(--font-brand);
}

/* Features Section */
.features-section { background: #F8F9FA; }

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-box {
    padding: 40px;
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid #EAEAEA;
    transition: var(--transition);
}

.feature-box:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    background: #E8F0FE;
    color: var(--google-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.feature-box h4 {
    font-size: 20px;
    margin-bottom: 12px;
}

.feature-box p {
    color: #5F6368;
    font-size: 15px;
}

/* Footer (Matching Intern Style Exactly) */
.app-footer {
    background: #F8F9FA;
    padding: 100px 0 40px;
    border-top: 1px solid #EAEAEA;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 3.5fr;
    gap: 64px;
    margin-bottom: 64px;
}

.footer-brand .logo { margin-bottom: 20px; }
.brand-desc {
    color: #5F6368;
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 32px;
    max-width: 320px;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid #DADCE0;
    color: #5F6368;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-links a:hover {
    background: #F1F3F4;
    color: var(--google-blue);
    border-color: var(--google-blue);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
}

.link-group h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 24px;
    color: #202124;
}

.link-group a {
    display: block;
    color: #70757A;
    font-size: 14px;
    margin-bottom: 16px;
    text-decoration: none;
    transition: 0.2s;
}

.link-group a:hover { color: var(--google-blue); }

.contact-link {
    display: flex;
    align-items: center;
    gap: 12px;
}

.icon-blue { color: var(--google-blue); font-size: 20px; }

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid #EAEAEA;
    text-align: center;
    color: #70757A;
    font-size: 13px;
}

/* Responsive Adjustments */
@media (max-width: 1024px) {
    .platform-grid, .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 850px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .hero-section { padding: 120px 0 60px; }
    .hero-title { font-size: 40px; }
    .hero-stats-card {
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        width: 100%;
    }
    .stat-divider {
        width: 60px;
        height: 1px;
    }
    section { padding: 60px 0; }
    .section-header { margin-bottom: 40px; }
    .section-header h2 { font-size: 32px; }
}

@media (max-width: 600px) {
    .platform-grid, .features-grid {
        grid-template-columns: 1fr;
    }
    .hero-cta-group {
        flex-direction: column;
        padding: 0 24px;
    }
    .btn-large { width: 100%; }
}

@media (max-width: 400px) {
    .footer-links {
        grid-template-columns: 1fr;
    }
    .logo { font-size: 18px; }
}