/*
 * CSS Architecture for IIT Aryavarta (International Standard)
 * Features: Fluid Typography, CSS Variables, Glassmorphism, CSS Grid, Advanced Animations
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800;900&display=swap');

/* --- 1. Variables & Tokens --- */
:root {
  /* Light theme */
  --clr-bg-main: #f9fafb;
  --clr-text-base: #1f2937;
  --clr-text-muted: #6b7280;
  --clr-primary: #0ea5e9;
  --clr-accent: #f59e0b;
  --clr-bg-dark: #111827;
  --clr-text-invert: #ffffff;
}

[data-theme="dark"] {
  --clr-bg-main: var(--clr-bg-dark);
  --clr-text-base: var(--clr-text-invert);
  --clr-text-muted: #d1d5db;
  --clr-primary: #38bdf8;
  --clr-accent: #fbbf24;
}
  /* Core Colors */
  --clr-primary: #0f172a;       /* Deep Slate Blue */
  --clr-primary-light: #1e293b; /* Lighter Slate */
  --clr-accent: #f59e0b;        /* Vibrant Gold/Amber */
  --clr-accent-hover: #fbbf24;  /* Lighter Gold */
  
  /* Surface Colors */
  --clr-bg-main: #f8fafc;       /* Off-white background */
  --clr-bg-surface: #ffffff;    /* Card background */
  --clr-bg-dark: #020617;       /* Darkest sections */
  
  /* Text Colors */
  --clr-text-base: #334155;     /* Main body text */
  --clr-text-heading: #0f172a;  /* Heading text */
  --clr-text-muted: #64748b;    /* Subtitles, meta info */
  --clr-text-invert: #f8fafc;   /* Text on dark backgrounds */
  
  /* Fluid Typography (Min Size -> Max Size based on viewport) */
  --fs-xs: clamp(0.75rem, 0.71rem + 0.18vw, 0.85rem);
  --fs-sm: clamp(0.875rem, 0.83rem + 0.22vw, 1rem);
  --fs-base: clamp(1rem, 0.96rem + 0.22vw, 1.125rem);
  --fs-lg: clamp(1.125rem, 1.08rem + 0.22vw, 1.25rem);
  --fs-xl: clamp(1.25rem, 1.14rem + 0.54vw, 1.5rem);
  --fs-2xl: clamp(1.5rem, 1.32rem + 0.89vw, 2rem);
  --fs-3xl: clamp(2rem, 1.64rem + 1.79vw, 3rem);
  --fs-4xl: clamp(2.5rem, 1.96rem + 2.68vw, 4rem);
  --fs-5xl: clamp(3rem, 2.11rem + 4.46vw, 5.5rem);

  /* Fonts */
  --ff-heading: 'Outfit', sans-serif;
  --ff-body: 'Inter', sans-serif;

  /* Spacing */
  --sp-xs: 0.5rem;
  --sp-sm: 1rem;
  --sp-md: 2rem;
  --sp-lg: 4rem;
  --sp-xl: 8rem;

  /* Layout & Effects */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --max-width: 1440px;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-bg-dark: rgba(15, 23, 42, 0.85);
  --glass-blur: blur(12px);
}

/* --- 2. Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 100%;
}

body {
  font-family: var(--ff-body);
  font-size: var(--fs-base);
  color: var(--clr-text-base);
  background-color: var(--clr-bg-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--ff-heading);
  color: var(--clr-text-heading);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

img, picture, video {
  max-width: 100%;
  display: block;
  height: auto;
  object-fit: cover;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* --- 3. Utilities --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: clamp(1rem, 5vw, 4rem);
}

.text-accent { color: var(--clr-accent); }
.text-invert { color: var(--clr-text-invert); }
.text-center { text-align: center; }

.section-padding { padding-block: var(--sp-xl); }
.bg-dark { background-color: var(--clr-primary); color: var(--clr-text-invert); }

.section-header {
  margin-bottom: var(--sp-lg);
  max-width: 800px;
}
.section-header.center {
  margin-inline: auto;
  text-align: center;
}
.section-header h2 {
  font-size: var(--fs-4xl);
  margin-bottom: var(--sp-sm);
}
.section-header p {
  font-size: var(--fs-lg);
  color: var(--clr-text-muted);
}
.bg-dark .section-header h2 { color: var(--clr-text-invert); }
.bg-dark .section-header p { color: rgba(255,255,255,0.7); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  font-family: var(--ff-heading);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 100vw; /* Pill shape */
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn-primary {
  background-color: var(--clr-accent);
  color: var(--clr-primary);
}
.btn-primary:hover {
  background-color: var(--clr-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -5px rgba(245, 158, 11, 0.4);
}

.btn-outline {
  background-color: transparent;
  color: var(--clr-text-invert);
  border: 1px solid rgba(255,255,255,0.3);
}
.btn-outline:hover {
  background-color: var(--clr-text-invert);
  color: var(--clr-primary);
  border-color: var(--clr-text-invert);
  transform: translateY(-2px);
}

.btn-text {
  padding: 0;
  color: var(--clr-primary);
  border-radius: 0;
  text-transform: none;
  font-size: var(--fs-base);
}
.btn-text::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--clr-accent);
  transition: var(--transition-smooth);
}
.btn-text:hover::after { width: 100%; }

/* --- 4. Header & Navigation --- */
header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  transition: var(--transition-smooth);
  /* Initial state: transparent over hero */
  background: transparent;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

header.scrolled {
  background: var(--glass-bg-dark);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  box-shadow: var(--shadow-sm);
}

.top-bar {
  background: rgba(0, 0, 0, 0.2);
  padding-block: 0.5rem;
  font-size: var(--fs-xs);
  color: rgba(255,255,255,0.8);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: var(--transition-smooth);
}
header.scrolled .top-bar {
  height: 0;
  padding: 0;
  overflow: hidden;
  opacity: 0;
  border: none;
}

.top-bar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.top-bar-links { display: flex; gap: 1.5rem; }
.top-bar-links a:hover { color: var(--clr-accent); }
.top-bar-info { display: flex; gap: 1.5rem; align-items: center; }

.main-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: 1rem;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--clr-text-invert);
}
.logo-icon {
  width: 48px;
  height: 48px;
  background: var(--clr-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--ff-heading);
  font-weight: 800;
  font-size: var(--fs-lg);
  color: var(--clr-primary);
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.3);
}
.logo-text h1 { font-size: var(--fs-lg); color: inherit; line-height: 1; margin-bottom: 0.2rem;}
.logo-text p { font-size: var(--fs-xs); color: rgba(255,255,255,0.7); text-transform: uppercase; letter-spacing: 0.1em; }

/* Desktop Menu */
.nav-menu {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}
.nav-item { position: relative; }
.nav-link {
  color: rgba(255,255,255,0.9);
  font-family: var(--ff-heading);
  font-size: var(--fs-sm);
  font-weight: 500;
  padding-block: 1rem; /* increase hit area */
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-link:hover, .nav-link.active { color: var(--clr-accent); }

/* Mega Menu */
.mega-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  width: 800px;
  background: var(--clr-bg-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  padding: 2rem;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-smooth);
  pointer-events: none;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2rem;
  border-top: 4px solid var(--clr-accent);
}
.nav-item.has-mega:hover .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
.mega-col h3 {
  font-size: var(--fs-sm);
  color: var(--clr-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 0.5rem;
}
.mega-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-block: 0.5rem;
  color: var(--clr-text-base);
  font-size: var(--fs-sm);
  transition: var(--transition-fast);
}
.mega-link i { font-size: 1.2rem; color: var(--clr-text-muted); transition: var(--transition-fast); }
.mega-link:hover { color: var(--clr-accent); transform: translateX(5px); }
.mega-link:hover i { color: var(--clr-accent); }

/* Standard Dropdown */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: var(--clr-bg-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition-smooth);
  border-top: 4px solid var(--clr-accent);
}
.nav-item.has-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  color: var(--clr-text-base);
  font-size: var(--fs-sm);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}
.dropdown-item i {
  font-size: 1.2rem;
  color: var(--clr-text-muted);
  transition: var(--transition-fast);
}
.dropdown-item:hover {
  background: var(--clr-bg-main);
  color: var(--clr-accent);
  transform: translateX(5px);
}
.dropdown-item:hover i {
  color: var(--clr-accent);
}

/* Mobile Menu Button */
.mobile-toggle {
  display: none;
  font-size: 2rem;
  color: var(--clr-text-invert);
  z-index: 1001;
}

/* --- 4. Layout & Spacing --- */
.section-padding {
  padding: 4rem 0; /* Reduced from 6rem for a more compact look */
}
.section-header {
  margin-bottom: 2.5rem; /* Reduced from 4rem */
  max-width: 700px;
}
.section-header.center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}
.section-header h2 {
  font-size: var(--fs-4xl);
  margin-bottom: 1rem;
}
.section-header p {
  font-size: var(--fs-lg);
  color: var(--clr-text-muted);
}

/* --- 5. Hero Section (Robust Fallback) --- */
.hero-slider {
  height: 85vh; /* Reduced height for a more compact feel */
  min-height: 500px;
  width: 100%;
  position: relative;
  background: var(--clr-primary); /* Fallback color */
  overflow: hidden;
}
/* Fallback if Swiper JS fails to load */
.swiper-wrapper {
  display: flex;
  height: 100%;
  width: 100%;
}
.swiper-slide {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  height: 100%;
  flex-shrink: 0;
  background-color: var(--clr-primary); /* Critical fix: prevents seeing through faded slides */
}
.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  opacity: 0.6; /* Ensure background is dark enough for white text */
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(15,23,42,0.95) 0%, rgba(15,23,42,0.7) 50%, rgba(15,23,42,0.3) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  color: var(--clr-text-invert);
}
.hero-tag {
  display: inline-block;
  padding: 0.35rem 1.2rem;
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid var(--clr-accent);
  color: var(--clr-accent);
  border-radius: 100vw;
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
}
.hero-content h2 {
  font-size: var(--fs-5xl);
  line-height: 1.1;
  margin-bottom: 1.5rem;
  color: #ffffff;
}
.hero-content p {
  font-size: var(--fs-lg);
  color: rgba(255,255,255,0.9);
  margin-bottom: 2.5rem;
  max-width: 600px;
}
.hero-btns { display: flex; gap: 1rem; }

/* Swiper Customization */
.swiper-pagination-bullet { background: #fff; opacity: 0.5; }
.swiper-pagination-bullet-active { background: var(--clr-accent); opacity: 1; }
.swiper-button-next, .swiper-button-prev { color: #fff; transform: scale(0.7); }

/* --- Custom Scroll Animations (Replaces AOS) --- */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }

/* --- 6. Stats Section --- */
.stats-section {
  position: relative;
  margin-top: -80px;
  z-index: 10;
  padding-bottom: var(--sp-lg);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid rgba(255,255,255,0.5);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 3rem;
  gap: 2rem;
}
.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
}
.stat-item:not(:last-child)::after {
  content: '';
  text-align: center;
  padding: 1rem;
}
.stat-icon {
  font-size: 2.5rem; /* Reduced from 3rem */
  color: var(--clr-accent);
  margin-bottom: 0.75rem;
}
.stat-num {
  font-size: var(--fs-3xl); /* Reduced from 4xl */
  font-weight: 700;
  color: var(--clr-primary);
  margin-bottom: 0.25rem;
  font-family: var(--ff-heading);
}
.stat-label {
  font-size: var(--fs-sm);
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* --- 7. Academic Programs --- */
.programs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); /* Reduced from 320px */
  gap: 2rem;
}
.program-card {
  background: var(--clr-bg-main);
  border-radius: var(--radius-lg);
  padding: 2rem; /* Reduced from 3rem */
  border: 1px solid #e2e8f0;
  transition: var(--transition-bounce);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.program-card:hover {
  transform: translateY(-5px); /* Reduced from -10px */
  box-shadow: var(--shadow-lg);
  border-color: var(--clr-primary-light);
}
.program-icon-wrapper {
  overflow: hidden;
}
.program-icon-wrapper::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(245,158,11,0.2) 0%, transparent 70%);
}
.program-icon-wrapper i {
  font-size: 4rem;
  color: var(--clr-text-invert);
  z-index: 1;
  transition: var(--transition-smooth);
}
.program-card:hover .program-icon-wrapper i {
  transform: scale(1.2);
  color: var(--clr-accent);
}
.program-content {
  padding: 2rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}
.program-content h3 { font-size: var(--fs-xl); margin-bottom: 1rem; }
.program-content p { color: var(--clr-text-muted); margin-bottom: 2rem; flex-grow: 1; }
.program-content .btn-text { margin-top: auto; align-self: flex-start; }

/* --- 8. Research Spotlight (Asymmetric Grid) --- */
.research-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.research-content h2 { margin-bottom: 1.5rem; }
.research-content p { margin-bottom: 2rem; font-size: var(--fs-lg); color: rgba(255,255,255,0.8); }
.research-list { display: flex; flex-direction: column; gap: 1.5rem; margin-bottom: 2.5rem; }
.research-list-item { display: flex; gap: 1rem; align-items: flex-start; }
.research-list-item i { font-size: 1.5rem; color: var(--clr-accent); margin-top: 0.2rem; }
.research-list-item h4 { color: #fff; font-size: var(--fs-lg); margin-bottom: 0.25rem;}
.research-list-item p { font-size: var(--fs-sm); margin: 0; }

.research-visual { position: relative; }
.research-img-main {
  border-radius: var(--radius-lg);
  width: 90%;
  box-shadow: var(--shadow-xl);
}
.research-stat-card {
  position: absolute;
  bottom: -2rem;
  right: 0;
  background: var(--clr-bg-surface);
  padding: 2rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--clr-accent);
  color: var(--clr-primary);
  max-width: 250px;
}
.research-stat-card h4 { font-size: var(--fs-3xl); color: var(--clr-primary); line-height: 1; margin-bottom: 0.5rem;}
.research-stat-card p { font-size: var(--fs-sm); color: var(--clr-text-muted); margin: 0; }

/* --- 9. News & Events --- */
.news-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
}
.news-article {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  background: var(--clr-bg-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
  margin-bottom: 1.5rem;
}
.news-article:hover { transform: translateX(10px); box-shadow: var(--shadow-md); }
.news-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.news-content { padding: 1.5rem 1.5rem 1.5rem 0; }
.news-meta {
  display: flex;
  gap: 1rem;
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  margin-bottom: 0.5rem;
  font-weight: 600;
}
.news-meta span { display: flex; align-items: center; gap: 0.25rem; }
.news-meta i { color: var(--clr-accent); }
.news-content h3 { font-size: var(--fs-lg); margin-bottom: 0.5rem; }
.news-content p { font-size: var(--fs-sm); color: var(--clr-text-muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* Events Sidebar */
.events-sidebar {
  background: var(--clr-primary);
  color: var(--clr-text-invert);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}
.events-sidebar h3 { font-size: var(--fs-xl); color: #fff; margin-bottom: 2rem; padding-bottom: 1rem; border-bottom: 1px solid rgba(255,255,255,0.1); }
.event-item { margin-bottom: 1.5rem; display: flex; gap: 1rem; }
.event-date {
  background: rgba(255,255,255,0.1);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  text-align: center;
  min-width: 60px;
  height: max-content;
}
.event-date span.day { display: block; font-size: var(--fs-xl); font-family: var(--ff-heading); font-weight: 700; color: var(--clr-accent); line-height: 1; }
.event-date span.month { font-size: var(--fs-xs); text-transform: uppercase; }
.event-info h4 { font-size: var(--fs-base); color: #fff; margin-bottom: 0.25rem; }
.event-info p { font-size: var(--fs-xs); color: rgba(255,255,255,0.7); display: flex; align-items: center; gap: 0.25rem; }

/* --- 10. Footer --- */
footer {
  background: var(--clr-bg-dark);
  color: rgba(255,255,255,0.7);
  padding-top: var(--sp-xl);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 4rem;
  margin-bottom: var(--sp-lg);
}
.footer-logo h2 { color: #fff; font-size: var(--fs-2xl); margin-bottom: 1rem; }
.social-links { display: flex; gap: 1rem; margin-top: 1.5rem; }
.social-links a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: var(--transition-smooth);
}
.social-links a:hover { background: var(--clr-accent); color: var(--clr-primary); transform: translateY(-3px); }

.footer-widget h3 { color: #fff; font-size: var(--fs-lg); margin-bottom: 1.5rem; }
.footer-links li { margin-bottom: 0.75rem; }
.footer-links a:hover { color: var(--clr-accent); padding-left: 5px; }

.newsletter-form { margin-top: 1rem; position: relative; }
.newsletter-form input {
  width: 100%;
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: none;
  background: rgba(255,255,255,0.1);
  color: #fff;
  padding-right: 3rem;
}
.newsletter-form input:focus { outline: 1px solid var(--clr-accent); }
.newsletter-form button {
  position: absolute;
  right: 5px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--clr-accent);
  color: var(--clr-primary);
  width: 35px;
  height: 35px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}
.newsletter-form button:hover { background: var(--clr-accent-hover); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-block: 1.5rem;
  text-align: center;
  font-size: var(--fs-sm);
}

/* --- 11. Mobile Overlay Menu --- */
.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  background: var(--clr-primary);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-smooth);
  clip-path: circle(0% at top right);
}
.mobile-menu-overlay.active {
  opacity: 1;
  visibility: visible;
  clip-path: circle(150% at top right);
}
.mobile-nav-list { text-align: center; font-size: var(--fs-2xl); font-family: var(--ff-heading); display: flex; flex-direction: column; gap: 1.5rem;}
.mobile-nav-list a { color: #fff; }
.mobile-nav-list a:hover { color: var(--clr-accent); }
.close-menu {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 2.5rem;
  color: #fff;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .nav-menu { display: none; }
  .mobile-toggle { display: block; }
  .research-layout { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .top-bar { display: none; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat-item:not(:last-child)::after { display: none; }
  .news-article { grid-template-columns: 1fr; }
  .news-img { height: 200px; }
  .footer-grid { grid-template-columns: 1fr; gap: 2.5rem; }
}