/* ==========================================================================
   KRU NAT ONLINE - GLOBAL DESIGN SYSTEM & STYLESHEET (ACADEMIC & INSPIRATIONAL)
   Domain: krunat.pcshsksn.ac.th (โรงเรียนวิทยาศาสตร์จุฬาภรณราชวิทยาลัย กาฬสินธุ์)
   Author: ครูณัฐพล ไสยสาลี (Kru Nat)
   ========================================================================== */

:root {
  /* Color Palette - Princess Chulabhorn Science High School & Modern EdTech */
  --primary: #1e40af;          /* Deep Royal Blue */
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --accent: #0ea5e9;           /* Cyan Glow Accent */
  --accent-hover: #0284c7;
  --accent-glow: rgba(14, 165, 233, 0.35);
  --accent-warm: #f59e0b;      /* Amber / Inspiration */
  --accent-emerald: #10b981;   /* Emerald / Tech & Growth */
  --accent-purple: #8b5cf6;    /* Violet / Innovation & AI */

  /* Neutral Shades */
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  /* Elevation & Shadows */
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 10px -1px rgba(0, 0, 0, 0.07), 0 2px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 20px -3px rgba(0, 0, 0, 0.08), 0 4px 8px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 30px -5px rgba(0, 0, 0, 0.1), 0 10px 15px -6px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 25px var(--accent-glow);
  --glass-bg: rgba(255, 255, 255, 0.94);
  --glass-border: rgba(255, 255, 255, 0.4);

  /* Typography & Layout */
  --font-heading: 'Kanit', sans-serif;
  --font-body: 'Kanit', 'Sarabun', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --container-max: 1200px;
}

/* Base Reset & Typography */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* ==========================================================================
   GLOBAL HEADER & NAVIGATION BAR
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.site-header .nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 76px;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  transition: var(--transition);
}

.site-brand:hover {
  transform: translateY(-1px);
}

.brand-logo-img {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--primary-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.site-brand:hover .brand-logo-img {
  transform: rotate(5deg) scale(1.05);
}

.brand-title {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.3px;
}

.brand-sub {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.2px;
}

/* Nav Links */
.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--primary);
  background-color: var(--primary-light);
}

.nav-link.active {
  color: #ffffff !important;
  background: linear-gradient(135deg, var(--primary), var(--accent)) !important;
  box-shadow: 0 4px 14px rgba(30, 64, 175, 0.3);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 22px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: #ffffff !important;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(30, 64, 175, 0.35);
  transition: var(--transition);
  margin-left: 10px;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(30, 64, 175, 0.45);
}

/* Mobile Nav Toggle Button */
.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  font-size: 1.25rem;
  color: var(--text-main);
  cursor: pointer;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.mobile-toggle:hover {
  background-color: var(--primary-light);
  color: var(--primary);
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 76px;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
  padding: 1.25rem 1.5rem;
  display: none;
  flex-direction: column;
  gap: 8px;
  z-index: 999;
}

.mobile-drawer.show {
  display: flex;
}

.mobile-drawer .nav-link {
  width: 100%;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-size: 1rem;
}

/* ==========================================================================
   BUTTONS, BADGES, & COMMON COMPONENTS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  letter-spacing: 0.2px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #ffffff !important;
  box-shadow: 0 8px 20px -4px rgba(30, 64, 175, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px -4px rgba(30, 64, 175, 0.5);
  color: #ffffff !important;
}

.btn-secondary {
  background: #ffffff;
  color: var(--primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: #ffffff !important;
  border: 1.5px solid rgba(255, 255, 255, 0.7);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: #ffffff;
  transform: translateY(-2px);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.badge-primary { background: var(--primary-light); color: var(--primary); }
.badge-accent { background: #e0f2fe; color: #0369a1; }
.badge-emerald { background: #d1fae5; color: #047857; }
.badge-amber { background: #fef3c7; color: #b45309; }
.badge-purple { background: #f3e8ff; color: #7e22ce; }

/* Section Header Standard */
.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3.5rem auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 5px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  margin-bottom: 0.85rem;
}

.section-title {
  font-size: clamp(1.85rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.28;
  margin-bottom: 1rem;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  font-weight: 300;
  line-height: 1.8;
}

/* Standard Section */
.section {
  padding: 5.5rem 0;
}

.section-alt {
  background-color: #ffffff;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

/* ==========================================================================
   HERO SECTION (HOME & LANDING)
   ========================================================================== */
.hero-wrapper {
  position: relative;
  background: linear-gradient(135deg, #0a0f1d 0%, #1e1b4b 50%, #0f172a 100%);
  color: #ffffff;
  padding: 6.5rem 0;
  overflow: hidden;
}

.hero-wrapper::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -15%;
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.22) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(50px);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.85fr;
  align-items: center;
  gap: 3.5rem;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: #38bdf8;
  margin-bottom: 1.5rem;
  backdrop-filter: blur(8px);
}

.hero-title {
  font-size: clamp(2.3rem, 4.5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.25rem;
  letter-spacing: -0.5px;
}

.hero-title-highlight {
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-desc {
  font-size: 1.15rem;
  color: #cbd5e1;
  font-weight: 300;
  line-height: 1.85;
  margin-bottom: 2.25rem;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-profile-box {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-profile-card {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(18px);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  text-align: center;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
  max-width: 370px;
  width: 100%;
  transition: var(--transition);
}

.hero-profile-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.4);
}

.hero-avatar-img {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 5px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.4);
  margin-bottom: 1.25rem;
  transition: var(--transition);
}

.hero-profile-card:hover .hero-avatar-img {
  transform: scale(1.03);
}

.hero-name {
  font-size: 1.45rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.25rem;
}

.hero-role {
  font-size: 0.92rem;
  color: #38bdf8;
  margin-bottom: 1rem;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

.hero-tag {
  background: rgba(255, 255, 255, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  color: #e2e8f0;
}

/* Stats Counter */
.stats-banner {
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  padding: 2.75rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-item h3 {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 0.4rem;
  letter-spacing: -0.5px;
}

.stat-item p {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* ==========================================================================
   FEATURE & INNOVATION HIGHLIGHT CARDS
   ========================================================================== */
.feature-box {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.feature-box:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.feature-icon-circle {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
}

.step-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.step-card {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  position: relative;
  transition: var(--transition);
}

.step-card:hover {
  background: #ffffff;
  border-color: var(--primary);
  transform: translateY(-2px);
}

.step-number {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--primary);
  background: var(--primary-light);
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
}

.step-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--text-main);
}

.step-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   CLASSROOM & COURSE CARDS
   ========================================================================== */
.filter-bar {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-sm);
}

.search-input-wrapper {
  position: relative;
  margin-bottom: 1.25rem;
}

.search-input-wrapper i {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
}

.search-input {
  width: 100%;
  padding: 12px 18px 12px 48px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--border-color);
  font-family: var(--font-body);
  font-size: 1rem;
  background: var(--bg-main);
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  background: #ffffff;
  box-shadow: 0 0 0 4px var(--primary-light);
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 0.75rem;
}

.filter-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 80px;
}

.filter-btn {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-main);
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.filter-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 2px 8px rgba(30, 64, 175, 0.3);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 2rem;
}

.course-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.85rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.course-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: var(--shadow-xl);
}

.course-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.25rem;
}

.course-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.course-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
}

.course-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 0.75rem;
}

.course-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.course-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 1.5rem;
}

.course-tag {
  font-size: 0.8rem;
  color: var(--accent);
  background: #f0f9ff;
  padding: 2px 8px;
  border-radius: 4px;
}

.course-actions {
  display: flex;
  gap: 8px;
  margin-top: auto;
}

.btn-course {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}

.btn-course-primary {
  background: var(--primary-light);
  color: var(--primary);
}

.btn-course-primary:hover {
  background: var(--primary);
  color: #ffffff;
}

.empty-course-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 2rem;
  background: #ffffff;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
}

.empty-icon {
  font-size: 3.5rem;
  color: var(--text-light);
  margin-bottom: 1rem;
}

/* ==========================================================================
   FAQ & ACCORDION
   ========================================================================== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--primary);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-question i {
  color: var(--primary);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 1.5rem 1.25rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* ==========================================================================
   ABOUT & PROFILE PAGE
   ========================================================================== */
.about-hero-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 3.5rem;
}

.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  align-items: center;
}

.about-portrait {
  width: 100%;
  aspect-ratio: 1/1;
  border-radius: 50%;
  object-fit: cover;
  border: 6px solid var(--primary-light);
  box-shadow: var(--shadow-lg);
}

.about-bio h1 {
  font-size: clamp(2rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.5rem;
  letter-spacing: -0.5px;
}

.about-title-tag {
  font-size: 1.1rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 1rem;
}

.about-text {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 1.5rem;
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 2rem;
  border-left: 3px solid var(--primary-light);
  margin-left: 1rem;
}

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
}

.timeline-dot {
  position: absolute;
  left: -2.65rem;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  border: 4px solid #ffffff;
  box-shadow: 0 0 0 3px var(--primary-light);
}

.timeline-content {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.timeline-content:hover {
  border-color: var(--primary);
  transform: translateX(4px);
}

.timeline-year {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.timeline-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

/* ==========================================================================
   COMPACT & CLEAN FOOTER
   ========================================================================== */
.site-footer {
  background: #0b1120;
  color: #94a3b8;
  padding: 2.25rem 0 1.25rem 0;
  margin-top: auto;
  border-top: 1px solid #1e293b;
  font-size: 0.9rem;
}

.footer-main {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid #1e293b;
}

.footer-brand-compact {
  max-width: 520px;
}

.footer-brand-title {
  margin-bottom: 0.4rem;
}

.footer-bio-short {
  font-size: 0.85rem;
  line-height: 1.6;
  color: #94a3b8;
  margin-bottom: 1rem;
}

.footer-social-compact {
  display: flex;
  gap: 8px;
}

.footer-social-compact .social-btn {
  width: 34px;
  height: 34px;
  font-size: 0.95rem;
  background: #1e293b;
  border-radius: 50%;
  color: #cbd5e1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: var(--transition);
}

.footer-social-compact .social-btn:hover {
  background: var(--primary);
  color: #ffffff;
  transform: translateY(-2px);
}

.footer-nav-compact {
  display: flex;
  gap: 2.5rem;
}

.footer-col-compact h5 {
  color: #ffffff;
  font-size: 0.92rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  letter-spacing: 0.3px;
}

.footer-col-compact ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.footer-col-compact a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.85rem;
  transition: var(--transition);
}

.footer-col-compact a:hover {
  color: #38bdf8;
  transform: translateX(2px);
}

.footer-bottom-compact {
  padding-top: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: #64748b;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS (MOBILE & TABLET OPTIMIZED)
   ========================================================================== */
@media (max-width: 992px) {
  .site-nav { display: none; }
  .mobile-toggle { display: block; }
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-cta-group { justify-content: center; }
  .hero-badge { margin: 0 auto 1.5rem auto; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
  .about-grid { grid-template-columns: 1fr; text-align: center; }
  .about-portrait { max-width: 220px; margin: 0 auto; }
}

@media (max-width: 768px) {
  .footer-main {
    flex-direction: column;
    gap: 1.5rem;
  }
  .footer-nav-compact {
    width: 100%;
    justify-content: space-between;
    gap: 1rem;
  }
  .footer-bottom-compact {
    flex-direction: column;
    text-align: center;
    gap: 0.4rem;
  }
}

@media (max-width: 640px) {
  .section { padding: 3.5rem 0; }
  .hero-wrapper { padding: 4.5rem 0; }
  .stats-grid { grid-template-columns: 1fr; gap: 1.25rem; }
  .courses-grid { grid-template-columns: 1fr; }
  .btn { width: 100%; justify-content: center; }
  .hero-cta-group { flex-direction: column; }
}