/* =====================================================
   STAFF PAGE 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 */
    --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 RESET ================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
}

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

a {
    text-decoration: none;
    color: inherit;
}

/* ================= BREADCRUMB ================= */
.breadcrumb-nav {
    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;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    flex-wrap: wrap;
}

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

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

.breadcrumb-container .separator {
    color: rgba(255,255,255,0.5);
}

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

/* ================= BANNER ================= */
.banner {
    height: 300px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 50%, var(--primary) 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    padding: 0 25px;
    border-bottom: 4px solid var(--accent);
    position: relative;
}

.banner::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;
}

.banner h1 {
    font-size: clamp(30px, 5vw, 44px);
    margin-bottom: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    text-shadow: 0 2px 15px rgba(0,0,0,0.2);
    position: relative;
    z-index: 1;
}

.banner p {
    font-size: clamp(14px, 2vw, 18px);
    opacity: 0.95;
    max-width: 600px;
    position: relative;
    z-index: 1;
}

/* ================= STAFF CONTROLS ================= */
.staff-controls {
    background: var(--white);
    padding: 28px 25px;
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid rgba(10, 37, 64, 0.08);
}

.search-box {
    max-width: 500px;
    margin: 0 auto 22px;
    position: relative;
}

.search-box i {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary);
    font-size: 16px;
}

.search-box input {
    width: 100%;
    padding: 14px 22px 14px 50px;
    border: 2px solid rgba(10, 37, 64, 0.1);
    border-radius: 30px;
    font-size: 15px;
    transition: var(--transition-smooth);
    outline: none;
    background: var(--bg);
}

.search-box input:focus {
    border-color: var(--accent);
    box-shadow: var(--glow-gold);
    background: var(--white);
}

.search-box input::placeholder {
    color: var(--text-light);
}

/* ================= TABS ================= */
.tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    max-width: 900px;
    margin: 0 auto;
}

.tab-btn {
    padding: 12px 26px;
    border: none;
    background: var(--white);
    cursor: pointer;
    border-radius: 30px;
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition-smooth);
    color: var(--text-light);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(10, 37, 64, 0.08);
}

.tab-btn:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: var(--primary);
    box-shadow: var(--glow-gold);
    border-color: var(--accent);
    font-weight: 700;
}

/* ================= STAFF SECTION ================= */
.staff-section {
    padding: 60px 25px;
    max-width: 1200px;
    margin: 0 auto;
    background: linear-gradient(135deg, #f4f6f9 0%, #eef2f7 100%);
}

.section-header {
    text-align: center;
    margin-bottom: 45px;
}

.section-header h2 {
    color: var(--primary);
    margin-bottom: 14px;
    font-size: clamp(22px, 3vw, 30px);
    position: relative;
    padding-bottom: 16px;
    font-weight: 700;
}

.section-header h2::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 70px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 2px;
}

.section-header p {
    color: var(--text-light);
    font-size: 16px;
    margin-top: 16px;
}

/* ================= DEPARTMENT ================= */
.dept {
    display: none;
    animation: fadeIn 0.5s ease forwards;
}

.dept.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ================= STAFF GRID ================= */
.staff-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

/* ================= STAFF CARD ================= */
.staff-card {
    background: var(--white);
    border-radius: 18px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-smooth);
    position: relative;
    text-align: center;
    border: 1px solid rgba(10, 37, 64, 0.06);
}

.staff-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent);
}

.staff-card.hod {
    border: 2px solid var(--accent);
}

.hod-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: var(--primary);
    padding: 6px 14px;
    font-size: 11px;
    font-weight: 700;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 10;
    box-shadow: var(--glow-gold);
}

/* STAFF PHOTO */
.staff-photo {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: linear-gradient(135deg, #f8fafc, #eef2f7);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.staff-photo img {
    width: 140px;
    height: 140px;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid var(--primary);
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-md);
}

.staff-card:hover .staff-photo img {
    transform: scale(1.08);
    border-color: var(--accent);
    box-shadow: var(--glow-gold);
}

/* STAFF INFO */
.staff-info {
    padding: 22px;
}

.staff-info h3 {
    font-size: 17px;
    color: var(--primary);
    margin-bottom: 6px;
    font-weight: 700;
}

.staff-info .designation {
    font-size: 14px;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 4px;
}

.staff-info .qualification {
    font-size: 13px;
    color: var(--text-light);
}

/* ================= FOOTER ================= */
footer {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: rgba(255,255,255,0.85);
    text-align: center;
    padding: 30px 25px;
    border-top: 3px solid var(--accent);
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-content p {
    margin-bottom: 10px;
    font-size: 15px;
}

.dev-popup {
    font-size: 13px;
    font-weight: 600;
    color: var(--accent) !important;
    margin-top: 12px !important;
}

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

.social-icons a {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: 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) {
    .banner h1 {
        animation: bannerFloat 3s ease-in-out infinite alternate;
    }
}

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

/* ================= RESPONSIVE ================= */
@media (max-width: 1100px) {
    .staff-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 900px) {
    .staff-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 22px;
    }
}

@media (max-width: 768px) {
    .banner {
        height: 240px;
    }
    
    .staff-section {
        padding: 40px 20px;
    }
    
    .section-header {
        margin-bottom: 35px;
    }
    
    .section-header h2 {
        font-size: 24px;
    }
    
    .tabs {
        gap: 10px;
    }
    
    .tab-btn {
        padding: 10px 18px;
        font-size: 13px;
    }
    
    .staff-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 18px;
    }
    
    .staff-photo {
        height: 180px;
    }
    
    .staff-photo img {
        width: 110px;
        height: 110px;
    }
    
    .staff-info {
        padding: 18px;
    }
    
    .staff-info h3 {
        font-size: 15px;
    }
    
    .staff-info .designation {
        font-size: 13px;
    }
    
    .breadcrumb-container {
        font-size: 13px;
    }
}

@media (max-width: 576px) {
    .banner {
        height: 200px;
    }
    
    .banner h1 {
        font-size: 26px;
        letter-spacing: 1px;
    }
    
    .banner p {
        font-size: 14px;
    }
    
    .staff-grid {
        grid-template-columns: 1fr;
        max-width: 320px;
        margin: 0 auto;
    }
    
    .tabs {
        gap: 8px;
    }
    
    .tab-btn {
        padding: 8px 14px;
        font-size: 12px;
    }
    
    .search-box input {
        padding: 12px 20px 12px 44px;
        font-size: 14px;
    }
    
    .staff-controls {
        padding: 22px 18px;
    }
}

@media (max-width: 400px) {
    .banner {
        height: 180px;
    }
    
    .banner h1 {
        font-size: 22px;
    }
    
    .tab-btn {
        padding: 8px 12px;
        font-size: 11px;
    }
}