/* =====================================================
   CAMPUS LIFE CSS - Enhanced Premium Theme
   Suhas Institute of Technology
   Professional College Theme: Navy Blue (#0A2540), White (#FFFFFF), Light Gold (#D4AF37)
   ===================================================== */

/* ================= CSS VARIABLES - Updated Premium Theme ================= */
:root {
    /* Primary Colors - Navy Blue Theme */
    --primary: #0A2540;
    --primary-dark: #061829;
    --primary-light: #143a5e;
    --primary-medium: #0d3251;
    
    /* Accent Colors - Light Gold */
    --accent: #D4AF37;
    --accent-light: #e5c565;
    --accent-dark: #b8962e;
    
    /* Additional Colors */
    --blue: #0077ff;
    --text: #333333;
    --text-light: #666666;
    --bg: #f4f6f9;
    --white: #ffffff;
    
    /* Shadows - Enhanced for depth */
    --shadow-xs: 0 1px 3px rgba(10, 37, 64, 0.08);
    --shadow-sm: 0 2px 8px rgba(10, 37, 64, 0.1);
    --shadow-md: 0 8px 25px rgba(10, 37, 64, 0.12);
    --shadow-lg: 0 15px 40px rgba(10, 37, 64, 0.15);
    --shadow-xl: 0 20px 50px rgba(10, 37, 64, 0.18);
    
    /* Gold glow effect */
    --glow-gold: 0 0 20px rgba(212, 175, 55, 0.3);
    
    /* Transitions - Smooth 0.3s-0.5s */
    --transition-fast: all 0.2s ease;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--white);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
}

/* ================= BREADCRUMB SECTION ================= */
.breadcrumb-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    padding: 14px 0;
    border-bottom: 2px solid var(--accent);
}

.breadcrumb-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 25px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 14px;
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.85);
    transition: var(--transition);
}

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

.breadcrumb .separator {
    color: rgba(255, 255, 255, 0.5);
    font-size: 10px;
}

.breadcrumb .current {
    color: var(--white);
    font-weight: 600;
}

/* ================= PAGE TITLE SECTION ================= */
.page-title-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 50%, var(--primary) 100%);
    padding: 60px 0 70px;
    border-bottom: 4px solid var(--accent);
    position: relative;
}

.page-title-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(212,175,55,0.12) 0%, transparent 60%);
    pointer-events: none;
}

.page-title-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 25px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.page-title-section h1 {
    font-size: clamp(28px, 4vw, 40px);
    color: var(--white);
    font-weight: 700;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

.page-title-section p {
    font-size: clamp(14px, 1.5vw, 18px);
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
}

/* ================= ACTIVITY INTRO SECTION ================= */
.activity-intro-section {
    background: var(--white);
    padding: 50px 0 20px;
}

.activity-intro-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 25px;
    text-align: center;
}

.activity-intro-container h2 {
    color: var(--primary);
    font-size: clamp(24px, 3vw, 32px);
    margin-bottom: 16px;
    font-weight: 700;
    position: relative;
    padding-bottom: 16px;
}

.activity-intro-container h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 2px;
}

.activity-intro-container p {
    color: var(--text-light);
    font-size: 16px;
    line-height: 1.8;
    margin: 0 auto 24px;
    max-width: 880px;
}

.activity-pill-wrap {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
}

.activity-pill {
    border: 1px solid rgba(10, 37, 64, 0.1);
    background: linear-gradient(135deg, #f8fafc 0%, #f0f4f8 100%);
    color: var(--primary);
    border-radius: 999px;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
}

.activity-pill:hover {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
    color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--glow-gold);
    border-color: var(--accent);
}

/* ================= ACTIVITY TABS ================= */
.activity-tabs-section {
    background: var(--white);
    padding: 0 0 20px;
    border-bottom: 1px solid rgba(10, 37, 64, 0.08);
}

.activity-tabs-wrap {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 25px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
}

.activity-tab-btn {
    padding: 12px 24px;
    border: 1px solid rgba(10, 37, 64, 0.12);
    background: var(--white);
    border-radius: 30px;
    color: var(--text-light);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-sm);
}

.activity-tab-btn:hover {
    color: var(--white);
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.activity-tab-btn.active {
    color: var(--white);
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    border-color: var(--accent);
    box-shadow: var(--glow-gold);
}

.activity-tab-btn.active:hover {
    background: linear-gradient(135deg, var(--accent-dark), var(--accent));
}

.activity-section {
    display: none;
    animation: fadeIn 0.4s ease;
}

.activity-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ================= GALLERY SECTION ================= */
.gallery-section {
    padding: 70px 0;
    background: linear-gradient(135deg, #f4f6f9 0%, #eef2f7 100%);
}

.gallery-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 25px;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-smooth);
    background: var(--white);
}

.gallery-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.gallery-image {
    position: relative;
    width: 100%;
    padding-top: 75%; /* 4:3 aspect ratio */
    overflow: hidden;
    background: var(--primary-light);
}

.gallery-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.gallery-item:hover .gallery-image img {
    transform: scale(1.12);
}

.gallery-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(10, 37, 64, 0.75) 0%, rgba(20, 58, 94, 0.85) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-smooth);
    pointer-events: none;
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-overlay i {
    font-size: 36px;
    color: var(--accent);
    transform: scale(0);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: none;
}

.gallery-item:hover .gallery-overlay i {
    transform: scale(1);
}

.activity-subheading {
    margin: 35px 0 20px;
    text-align: center;
    color: var(--primary);
    font-size: 24px;
    font-weight: 700;
    position: relative;
    padding-bottom: 14px;
}

.activity-subheading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 2px;
}

.quiz-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-width: 900px;
    margin: 0 auto;
}

/* Gallery Card Style for Events */
.gallery-card {
    position: relative;
    overflow: hidden;
    border-radius: 18px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-smooth);
    background: var(--white);
}

.gallery-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-xl);
}

.gallery-card .gallery-image {
    padding-top: 70%;
}

.gallery-card .gallery-overlay i {
    font-size: 32px;
    color: var(--accent);
}

/* ================= IMAGE LIGHTBOX ================= */
.image-lightbox {
    position: fixed;
    inset: 0;
    background: rgba(10, 37, 64, 0.92);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
    z-index: 9999;
    backdrop-filter: blur(5px);
}

.image-lightbox.open {
    display: flex;
    animation: lightboxFadeIn 0.3s ease;
}

@keyframes lightboxFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.image-lightbox img {
    max-width: min(1200px, 94vw);
    max-height: 88vh;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.5);
    animation: lightboxImageIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes lightboxImageIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.3);
    background: rgba(255,255,255,0.1);
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.lightbox-close:hover {
    background: var(--accent);
    color: var(--primary);
    transform: rotate(90deg);
}

/* ================= FOOTER ================= */
footer {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: var(--white);
    padding: 35px 25px;
    text-align: center;
    border-top: 3px solid var(--accent);
}

.footer-content p {
    font-size: 15px;
    margin-bottom: 12px;
    opacity: 0.9;
}

.dev-popup {
    font-size: 12px !important;
    opacity: 0.7 !important;
    margin-bottom: 15px !important;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 18px;
    margin-top: 20px;
}

.social-icons a {
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: var(--transition-smooth);
    border: 1px solid rgba(255,255,255,0.15);
}

.social-icons a:hover {
    background: var(--accent);
    color: var(--primary);
    transform: translateY(-4px) scale(1.1);
    box-shadow: var(--glow-gold);
}

/* ================= ANIMATIONS ================= */
@media (prefers-reduced-motion: no-preference) {
    .page-title-section h1 {
        animation: titleFloat 3s ease-in-out infinite alternate;
    }
}

@keyframes titleFloat {
    from { transform: translateY(0); }
    to { transform: translateY(-5px); }
}

/* ================= RESPONSIVE ================= */
@media (max-width: 992px) {
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 22px;
    }
}

@media (max-width: 768px) {
    .page-title-section h1 {
        font-size: 28px;
    }

    .page-title-section p {
        font-size: 15px;
    }

    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 18px;
    }

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

    .gallery-section {
        padding: 50px 0;
    }

    .activity-intro-section {
        padding: 40px 0 15px;
    }

    .activity-tabs-wrap {
        justify-content: flex-start;
        gap: 10px;
    }

    .activity-tab-btn {
        padding: 10px 18px;
        font-size: 14px;
    }

    .activity-intro-container h2 {
        font-size: 24px;
    }

    .activity-subheading {
        font-size: 20px;
    }
}

@media (max-width: 576px) {
    .breadcrumb {
        font-size: 12px;
    }

    .gallery-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .page-title-section {
        padding: 45px 0 55px;
    }

    .page-title-section h1 {
        font-size: 24px;
    }

    .gallery-item,
    .gallery-card {
        border-radius: 14px;
    }

    .activity-tabs-wrap {
        justify-content: center;
    }

    .activity-pill-wrap {
        gap: 8px;
    }

    .activity-pill {
        padding: 8px 14px;
        font-size: 13px;
    }

    .activity-intro-container h2 {
        font-size: 22px;
    }

    .activity-intro-container p {
        font-size: 14px;
    }
}