/* ==========================================================================
   1. THEME VARIABLES & RESET (PREMIUM WHITE)
   ========================================================================== */
:root {
    /* [INSTRUCTION] Change these colors to match your brand exactly */
    --bg-main: #ffffff;           /* Pure White Background */
    --bg-alt: #f8fafc;            /* Very Light Grey for alternating sections */
    --bg-card: #ffffff;           /* White cards */
    
    --text-main: #0f172a;         /* Deep Navy (Almost Black) for Headings */
    --text-muted: #475569;        /* Slate Grey for paragraphs */
    
    --accent: #2563eb;            /* Professional Blue (Trust) */
    --border: #e2e8f0;            /* Subtle Light Grey Borders */
    
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
    
    --max-width: 1200px;
    --header-height: 80px;
}

* { box-sizing: border-box; margin: 0; padding: 0; outline: none; }
html { scroll-behavior: smooth; }

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.7;
    padding-top: var(--header-height);
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }

/* [INSTRUCTION] Global Image Style - Ensures images fit containers */
img { max-width: 100%; display: block; height: auto; }

/* ==========================================================================
   2. TYPOGRAPHY
   ========================================================================== */
h1, h2, h3, h4 { font-family: var(--font-heading); color: var(--text-main); font-weight: 700; }
h1 { font-size: clamp(3rem, 5vw, 4.5rem); line-height: 1.1; margin-bottom: 1.5rem; }
h2 { font-size: clamp(2rem, 3vw, 3rem); margin-bottom: 1rem; }
h3 { font-size: 1.5rem; margin-bottom: 1rem; }
p { color: var(--text-muted); margin-bottom: 1.5rem; font-size: 1.05rem; }

.text-center { text-align: center; }
.section-title { max-width: 800px; margin: 0 auto 4rem auto; text-align: center; }

/* ==========================================================================
   3. COMPONENTS (Buttons, Grid, Navbar)
   ========================================================================== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
.section { padding: 6rem 0; border-bottom: 1px solid var(--border); }
.bg-alt { background-color: var(--bg-alt); }

/* Buttons */
.btn {
    display: inline-block; padding: 1rem 2.5rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 1px; cursor: pointer;
    border: 1px solid var(--text-main); background: transparent; color: var(--text-main);
    transition: 0.3s; font-size: 0.85rem;
}
.btn-primary { background: var(--text-main); color: white; border-color: var(--text-main); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); }
.btn-outline:hover { background: var(--text-main); color: white; }
.btn-center { display: block; width: fit-content; margin: 3rem auto 0; }

/* Navigation */
.navbar {
    position: fixed; top: 0; left: 0; width: 100%; height: var(--header-height);
    background: rgba(255, 255, 255, 0.95); /* White Glass */
    backdrop-filter: blur(10px); border-bottom: 1px solid var(--border);
    z-index: 1000; display: flex; align-items: center;
}
.nav-container { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.logo { font-family: var(--font-heading); font-size: 1.8rem; font-weight: 700; color: var(--text-main); }
.nav-links { display: flex; gap: 2rem; }
.nav-links a { font-size: 0.9rem; font-weight: 600; text-transform: uppercase; color: var(--text-muted); }
.nav-links a:hover { color: var(--text-main); }

/* Mobile Menu */
.mobile-toggle { display: none; background: none; border: none; cursor: pointer; }
.mobile-toggle span { display: block; width: 25px; height: 2px; background: var(--text-main); margin: 6px 0; }
@media (max-width: 900px) { .nav-links { display: none; } .mobile-toggle { display: block; } }

/* Mobile Overlay */
.mobile-menu {
    position: fixed; top: var(--header-height); left: 0; width: 100%; height: 0;
    background: white; overflow: hidden; transition: 0.4s; z-index: 999;
    display: flex; flex-direction: column; padding: 0 2rem;
}
.mobile-menu.active { height: 100vh; padding-top: 2rem; }
.mobile-menu a { font-family: var(--font-heading); font-size: 1.5rem; margin-bottom: 1.5rem; }

/* ==========================================================================
   4. SECTION SPECIFIC STYLES
   ========================================================================== */

/* Hero */
.hero { padding: 4rem 0 6rem; background: var(--bg-main); }
.hero-content { max-width: 900px; margin: 0 auto; text-align: left; }

/* Trinity Cards (No Numbers) */
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.card {
    background: var(--bg-card); border: 1px solid var(--border); padding: 2.5rem;
    transition: 0.3s; height: 100%;
}
.card:hover { border-color: var(--accent); box-shadow: 0 10px 30px rgba(0,0,0,0.05); transform: translateY(-5px); }
.card h3 { margin-top: 0; }

/* Publications List (Categorized) */
.pub-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1.5rem; margin-top: 3rem; }
.pub-item {
    border: 1px solid var(--border); padding: 1.5rem; text-align: center;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    min-height: 150px;
}
.pub-category {
    font-size: 0.7rem; text-transform: uppercase; letter-spacing: 1px;
    background: var(--bg-alt); padding: 4px 8px; margin-bottom: 1rem; border-radius: 4px;
}
.pub-logo-placeholder { font-weight: 700; color: #cbd5e1; font-size: 1.2rem; }

/* Infinite Sliders (Awards, Reviews) */
.slider-wrap { overflow: hidden; white-space: nowrap; position: relative; padding: 2rem 0; }
.slider-track { display: inline-block; animation: scroll 30s linear infinite; }
.slide-item {
    display: inline-block; width: 250px; margin-right: 3rem; vertical-align: middle;
    background: var(--bg-alt); padding: 1.5rem; border: 1px solid var(--border);
    white-space: normal; /* Allows text wrapping inside card */
}
@keyframes scroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* Gallery (Our Work) */
.gallery-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.gallery-item { position: relative; overflow: hidden; height: 300px; border: 1px solid var(--border); }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: 0.5s; }
.gallery-item:hover img { transform: scale(1.05); }
.gallery-overlay {
    position: absolute; bottom: 0; left: 0; width: 100%; background: rgba(255,255,255,0.95);
    padding: 1.5rem; transform: translateY(100%); transition: 0.3s;
}
.gallery-item:hover .gallery-overlay { transform: translateY(0); }

/* Why Choose Us (Text Blocks) */
.why-grid { display: grid; gap: 3rem; }
@media(min-width: 768px) { .why-grid { grid-template-columns: 1fr 1fr; } }
.why-text h4 { color: var(--accent); margin-bottom: 0.5rem; }

/* FAQ Accordion */
.faq-item { border-bottom: 1px solid var(--border); }
.faq-question {
    padding: 1.5rem 0; cursor: pointer; display: flex; justify-content: space-between;
    font-weight: 600; font-family: var(--font-heading); font-size: 1.2rem;
}
.faq-answer { max-height: 0; overflow: hidden; transition: 0.3s ease-out; }
.faq-answer p { padding-bottom: 1.5rem; margin: 0; }
.faq-icon { transition: 0.3s; }
.faq-item.active .faq-answer { max-height: 200px; }
.faq-item.active .faq-icon { transform: rotate(45deg); }

/* Footer */
.footer { background: var(--bg-alt); border-top: 1px solid var(--border); font-size: 0.9rem; padding: 5rem 0 2rem; }
.footer-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 2rem; margin-bottom: 3rem; }
.footer h4 { font-size: 1rem; margin-bottom: 1.5rem; }
.footer a { display: block; margin-bottom: 0.8rem; color: var(--text-muted); }
.footer a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid #cbd5e1; padding-top: 2rem; text-align: center; color: var(--text-muted); }

/* Form */
input, textarea, select {
    width: 100%; padding: 1rem; margin-bottom: 1.5rem;
    background: white; border: 1px solid var(--border);
    font-family: inherit; transition: 0.3s;
}
input:focus, textarea:focus { border-color: var(--accent); }

/* Animations */
.fade-up { opacity: 0; transform: translateY(30px); transition: 0.8s; }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ==========================================================================
   INFINITE LOGO SLIDER (UPDATED: Big, Colorful & Fixed)
   ========================================================================== */
.logo-slider-section {
    background: #f8fafc;
    padding: 3rem 0; /* Increased padding for bigger logos */
    border-bottom: 1px solid var(--border);
    overflow: hidden;
}

.slider-label {
    text-align: center;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: #94a3b8;
    margin-bottom: 2rem;
    font-weight: 600;
}

.logo-slider-track {
    display: flex;
    align-items: center;
    /* IMPORTANT: Math = Slide Width (200px) * Total Slides (24)
       If you have fewer logos, adjust the number 24.
    */
    width: calc(200px * 24); 
    animation: infiniteScroll 40s linear infinite; /* Slower speed for better visibility */
}

/* THE CONTAINER BOX (Force Fit) */
.logo-slide {
    width: 200px;        /* Fixed width per logo */
    height: 100px;       /* Fixed height per logo (creates a consistent row) */
    padding: 0 1.5rem;   
    display: flex;
    justify-content: center;
    align-items: center;
}

/* THE IMAGE (Big & Colorful) */
.logo-slide img {
    max-width: 100%;     
    max-height: 80px;    /* INCREASED SIZE (Was 40px) */
    width: auto;
    height: auto;
    
    object-fit: contain; /* Ensures logo fits inside without stretching */
    
    opacity: 1;          /* Full visibility */
    filter: none;        /* Original Colors (No Grayscale) */
    
    transition: transform 0.3s;
}

/* Optional: Pop effect on hover */
.logo-slide img:hover {
    transform: scale(1.1);
}

@keyframes infiniteScroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(calc(-200px * 12)); } /* Move by half the total slides (12) */
}

/* Mobile Adjustment */
@media (max-width: 768px) {
    .logo-slider-track {
        animation-duration: 20s; 
    }
    .logo-slide img {
        max-height: 60px; /* Slightly smaller on mobile to fit screen better */
    }
}

/* ==========================================================================
   SOCIAL ICONS (FOOTER)
   ========================================================================== */
/* SOCIAL ROW (Container) */
.social-row {
    display: flex;
    gap: 15px;            /* Space between icons */
    margin-top: 1.5rem;
    align-items: center;
}

/* SOCIAL ICON (SVG Style) */
.social-icon {
    width: 24px !important;   /* Force Small Size */
    height: 24px !important;  /* Force Small Size */
    fill: #64748b;            /* Grey Color */
    transition: all 0.3s ease;
}

/* Hover Effect */
.social-row a:hover .social-icon {
    fill: #2563eb;            /* Change to Blue on Hover */
    transform: translateY(-3px); /* Float Up */
}

/* ==========================================================================
   MEDIA GRID & FILTERS (Updated Design)
   ========================================================================== */

/* 1. Filter Buttons */
.filter-container {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    flex-wrap: wrap;
    margin-bottom: 3.5rem;
}

.filter-btn {
    padding: 0.6rem 1.2rem;
    border: 1px solid transparent; /* Cleaner look */
    background: #f1f5f9;           /* Light grey bg like screenshot */
    color: var(--text-muted);
    border-radius: 6px;            /* Slightly rounded corners */
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: 0.3s;
}

.filter-btn:hover, .filter-btn.active {
    background: var(--text-main);
    color: white;
}

/* 2. The 5x5 Grid */
.media-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr); /* Force 5 columns */
    gap: 1.5rem;
}

/* 3. The Card Design (Matches Screenshot) */
.media-card {
    background: white;
    border: 1px solid #e2e8f0;    /* Subtle border */
    border-radius: 4px;
    height: 160px;                /* Fixed height for uniformity */
    display: flex;
    flex-direction: column;
    justify-content: center;      /* Center content vertically */
    align-items: center;          /* Center content horizontally */
    position: relative;
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.media-card:hover {
    border-color: var(--accent);
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.08); /* Premium hover lift */
}

/* 4. The Category Pill (Top Center) */
.category-pill {
    position: absolute;
    top: 15px;
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #94a3b8;
    background: #f8fafc;
    padding: 4px 8px;
    border-radius: 4px;
}

/* 5. The Logo (Centered & Original Color) */
.media-card img {
    max-width: 85%;
    max-height: 50px;
    width: auto;
    object-fit: contain;
    margin-top: 15px; /* Push down slightly to clear the pill */
    filter: none;     /* Show original colors */
    opacity: 1;
}

/* Responsive Adjustments */
@media (max-width: 1100px) {
    .media-grid { grid-template-columns: repeat(3, 1fr); } /* 3 cols on tablet */
}
@media (max-width: 600px) {
    .media-grid { grid-template-columns: repeat(2, 1fr); } /* 2 cols on mobile */
    .media-card { height: 140px; }
}

/* ==========================================================================
   PRICING TOGGLE & CARDS
   ========================================================================== */

/* Toggle Container */
.pricing-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
    font-weight: 600;
}

.toggle-label {
    color: #94a3b8;
    transition: 0.3s;
}
.toggle-label.active {
    color: var(--text-main);
}

/* The Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}
.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}
input:checked + .slider { background-color: var(--accent); }
input:checked + .slider:before { transform: translateX(24px); }

/* Save Badge */
.save-badge {
    background: #dcfce7;
    color: #166534;
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 5px;
    vertical-align: middle;
}

/* Pricing Cards */
.pricing-card {
    display: flex;
    flex-direction: column;
    padding: 2rem;
    position: relative;
    border: 1px solid var(--border);
}

.pricing-card.popular {
    border-color: var(--accent);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.popular-tag {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--accent);
    color: white;
    padding: 5px 15px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.price {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 1rem 0 0.5rem 0;
    color: var(--text-main);
}

.period {
    font-size: 1rem;
    color: #666;
    font-weight: 400;
}

.billed-yearly {
    font-size: 0.8rem;
    color: #94a3b8;
    margin-bottom: 1rem;
}

.plan-features li {
    margin-bottom: 0.8rem;
    position: relative;
    padding-left: 1.5rem;
    list-style: none;
}

.plan-features li::before {
    content: "✔";
    position: absolute;
    left: 0;
    color: var(--accent);
}

.full-width {
    width: 100%;
    text-align: center;
    margin-top: auto; /* Pushes button to bottom */
}

.hidden {
    display: none;
}