:root {
  --ktu-blue: #004b70;
  --ktu-blue-dark: #073149;
  --ktu-blue-light: #0076ad;
  --ktu-gold: #f1b434;
  --ktu-gold-light: #f5cb6c;
  --ink: #10202b;
  --muted: #4a5c68;
  --line: rgba(255, 255, 255, 0.5);
  --paper: rgba(255, 255, 255, 0.65);
  --glass-bg: rgba(255, 255, 255, 0.4);
  --glass-border: rgba(255, 255, 255, 0.6);
  --shadow: 0 12px 40px 0 rgba(0, 75, 112, 0.12);
  --shadow-hover: 0 16px 50px 0 rgba(0, 75, 112, 0.2);
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Outfit', Arial, Helvetica, sans-serif;
  color: var(--ink);
  background-color: #eef2f5;
  position: relative;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Background Animated Shapes for Glassmorphism Context */
.bg-shape {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  z-index: -1;
  animation: float 18s infinite alternate ease-in-out;
  opacity: 0.6;
}

.shape-1 {
  width: 600px;
  height: 600px;
  background: var(--ktu-blue-light);
  top: -150px;
  left: -200px;
}

.shape-2 {
  width: 500px;
  height: 500px;
  background: var(--ktu-gold);
  bottom: -100px;
  right: -150px;
  animation-delay: -6s;
  opacity: 0.5;
}

.shape-3 {
  width: 450px;
  height: 450px;
  background: var(--ktu-blue);
  top: 40%;
  left: 55%;
  transform: translate(-50%, -50%);
  animation-delay: -12s;
  opacity: 0.4;
}

@keyframes float {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(60px, 40px) scale(1.1); }
  100% { transform: translate(-40px, 60px) scale(0.9); }
}

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

/* Glass Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 12px clamp(20px, 5vw, 56px);
  background: rgba(255, 255, 255, 0.45);
  border-bottom: 1px solid var(--glass-border);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  min-width: 330px;
  transition: transform 0.3s ease;
}

.brand:hover {
  transform: scale(1.02);
}

.brand-logo {
  width: 150px;
  height: 54px;
  object-fit: contain;
  display: block;
  flex: 0 0 auto;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.25;
}

.brand strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--ktu-blue-dark);
}

.brand small {
  color: var(--muted);
  font-size: 12px;
  margin-top: 2px;
  font-weight: 500;
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 14px;
  font-weight: 600;
}

.top-nav a {
  padding: 10px 16px;
  border-radius: 12px;
  color: var(--muted);
  transition: all 0.3s ease;
}

.top-nav a:not(.nav-button):hover,
.top-nav a:not(.nav-button):focus-visible {
  color: var(--ktu-blue-dark);
  background: rgba(255, 255, 255, 0.6);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  outline: none;
}

.top-nav .nav-button {
  color: #fff;
  background: linear-gradient(135deg, var(--ktu-blue), var(--ktu-blue-dark));
  box-shadow: 0 4px 15px rgba(0, 75, 112, 0.3);
}

.top-nav .nav-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 75, 112, 0.4);
}

main {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero {
  min-height: 620px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.72fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  padding: clamp(36px, 5vw, 64px) 0;
  animation: fadeIn 1s ease-out;
}

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

.eyebrow {
  margin: 0 0 12px;
  color: var(--ktu-gold);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.mail-exchange-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
  margin-bottom: 24px;
}

.mail-bubble {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 12px 24px rgba(7, 49, 73, 0.12);
  border: 1px solid rgba(255,255,255,0.9);
}

.mail-bubble-left {
  color: var(--ktu-blue);
  animation: floatLeft 3s ease-in-out infinite;
}

.mail-bubble-right {
  color: var(--ktu-gold);
  animation: floatRight 3s ease-in-out infinite;
  animation-delay: 1.5s;
}

.exchange-arrows {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.anim-arrow-right {
  animation: slideRight 2s ease-in-out infinite;
}

.anim-arrow-left {
  animation: slideLeft 2s ease-in-out infinite;
  animation-delay: 1s;
}

@keyframes floatLeft {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-6px) rotate(-4deg); box-shadow: 0 16px 30px rgba(7, 49, 73, 0.2); }
}

@keyframes floatRight {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(6px) rotate(4deg); box-shadow: 0 16px 30px rgba(241, 180, 52, 0.3); }
}

@keyframes slideRight {
  0% { transform: translateX(-4px); opacity: 0.4; }
  50% { transform: translateX(4px); opacity: 1; }
  100% { transform: translateX(-4px); opacity: 0.4; }
}

@keyframes slideLeft {
  0% { transform: translateX(4px); opacity: 1; }
  50% { transform: translateX(-4px); opacity: 0.4; }
  100% { transform: translateX(4px); opacity: 1; }
}

h1, h2, h3, p {
  margin-top: 0;
}

h1 {
  max-width: 690px;
  margin-bottom: 20px;
  font-size: clamp(36px, 4.5vw, 56px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1px;
  color: var(--ktu-blue-dark);
}

.hero-copy {
  max-width: 610px;
  color: var(--muted);
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.6;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 32px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 700;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.primary-action {
  color: #fff;
  background: linear-gradient(135deg, var(--ktu-blue), var(--ktu-blue-dark));
  box-shadow: 0 10px 20px rgba(0, 75, 112, 0.25);
  border: 1px solid rgba(255,255,255,0.1);
}

.primary-action:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 25px rgba(0, 75, 112, 0.35);
  background: linear-gradient(135deg, var(--ktu-blue-light), var(--ktu-blue));
}

.secondary-action {
  color: var(--ktu-blue-dark);
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
}

.secondary-action:hover {
  background: #fff;
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}

/* Glassmorphic Panel */
.status-panel {
  position: relative;
  padding: 24px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.status-panel::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(255,255,255,0.4) 0%, rgba(255,255,255,0.1) 100%);
  z-index: -1;
}

.mail-card {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid rgba(0, 75, 112, 0.1);
}

.mail-card:first-child {
  padding-top: 0;
}

.mail-card strong {
  font-size: 18px;
  color: var(--ktu-blue-dark);
  font-weight: 700;
}

.mail-card p,
.notice p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.5;
  font-size: 14px;
}

.mail-icon,
.service-icon {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(255,255,255,0.5));
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  border: 1px solid #fff;
}

.mail-icon::before,
.service-icon.envelope::before {
  content: "";
  width: 30px;
  height: 20px;
  border: 3px solid var(--ktu-blue);
  border-radius: 6px;
}

.mail-icon::after,
.service-icon.envelope::after {
  content: "";
  position: absolute;
  width: 23px;
  height: 23px;
  border-left: 3px solid var(--ktu-blue);
  border-bottom: 3px solid var(--ktu-blue);
  transform: rotate(-45deg) translateY(-2px);
}

.mail-icon.student {
  background: linear-gradient(135deg, var(--ktu-gold-light), #ffe8ab);
}

.mail-icon.student::before,
.mail-icon.student::after {
  border-color: #8c6100;
}

.notice {
  margin-top: 24px;
  padding: 20px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--ktu-blue-dark), var(--ktu-blue));
  color: #fff;
  box-shadow: 0 8px 20px rgba(0, 75, 112, 0.3);
}

.notice span {
  color: var(--ktu-gold);
  font-weight: 800;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.notice p {
  color: rgba(255, 255, 255, 0.9);
}

.section-block,
.split-section,
.policy-section {
  padding: 80px 0;
  position: relative;
}

.section-block::before,
.split-section::before,
.policy-section::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,75,112,0.15), transparent);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 40px;
}

.section-heading h2 {
  margin-bottom: 16px;
  font-size: clamp(28px, 3.5vw, 40px);
  letter-spacing: -0.5px;
  font-weight: 800;
  color: var(--ktu-blue-dark);
}

.section-heading p:not(.eyebrow) {
  color: var(--muted);
  line-height: 1.7;
  font-size: 17px;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

/* Glassmorphic Service Cards */
.service-card {
  position: relative;
  min-height: 290px;
  display: flex;
  flex-direction: column;
  padding: 28px;
  overflow: hidden;
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  box-shadow: var(--shadow);
}

.service-card:hover,
.service-card:focus-visible {
  transform: translateY(-8px);
  border-color: rgba(255,255,255,0.9);
  box-shadow: var(--shadow-hover);
  background: rgba(255,255,255,0.7);
  outline: none;
}

.service-card.featured {
  background: linear-gradient(135deg, rgba(255,255,255,0.8), rgba(241, 180, 52, 0.1));
  border-color: rgba(241, 180, 52, 0.4);
}

.service-card.featured:hover {
  background: linear-gradient(135deg, rgba(255,255,255,0.95), rgba(241, 180, 52, 0.2));
}

.tag {
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 6px 12px;
  border-radius: 999px;
  color: #fff;
  background: var(--ktu-gold);
  font-size: 12px;
  font-weight: 800;
  box-shadow: 0 4px 10px rgba(241, 180, 52, 0.4);
}

.service-icon {
  margin-bottom: 24px;
}

.service-icon.office::before {
  content: "";
  width: 25px;
  height: 31px;
  border: 5px solid #de4b21;
  border-left-width: 10px;
  transform: skewY(-8deg);
  border-radius: 2px;
}

.service-icon.lock::before {
  content: "";
  width: 28px;
  height: 22px;
  margin-top: 10px;
  border-radius: 4px;
  background: var(--ktu-blue);
}

.service-icon.lock::after {
  content: "";
  position: absolute;
  top: 12px;
  width: 24px;
  height: 20px;
  border: 4px solid var(--ktu-blue);
  border-bottom: 0;
  border-radius: 16px 16px 0 0;
}

.service-icon.cloud::before {
  content: "";
  width: 34px;
  height: 21px;
  border-radius: 18px;
  background: var(--ktu-blue-dark);
  box-shadow: -10px 5px 0 -1px var(--ktu-blue-dark), 10px 5px 0 -1px var(--ktu-blue-dark);
}

.service-card h3 {
  margin-bottom: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--ktu-blue-dark);
}

.service-card p {
  color: var(--muted);
  line-height: 1.6;
  font-size: 15px;
}

.card-link {
  margin-top: auto;
  color: var(--ktu-blue);
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.card-link::after {
  content: '→';
  transition: transform 0.3s ease;
}

.service-card:hover .card-link::after {
  transform: translateX(4px);
}

.split-section {
  display: grid;
  grid-template-columns: minmax(240px, 0.78fr) minmax(0, 1.22fr);
  gap: clamp(32px, 5vw, 80px);
  align-items: start;
}

.guide-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.guide-list a {
  min-height: 64px;
  display: flex;
  align-items: center;
  padding: 16px 20px;
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--ktu-blue-dark);
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0,0,0,0.02);
}

.guide-list a:hover,
.guide-list a:focus-visible {
  background: rgba(255, 255, 255, 0.8);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 75, 112, 0.08);
  border-color: rgba(255,255,255,1);
  outline: none;
}

.guide-list .guide-featured {
  grid-column: 1 / -1;
  min-height: 72px;
  color: #fff;
  background: linear-gradient(135deg, var(--ktu-blue), var(--ktu-blue-dark));
  border-color: transparent;
  font-size: 16px;
  box-shadow: 0 10px 20px rgba(0, 75, 112, 0.2);
}

.guide-list .guide-featured:hover,
.guide-list .guide-featured:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 15px 25px rgba(0, 75, 112, 0.3);
  color: #fff;
}

.policy-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.policy-grid article {
  padding: 32px;
  background: var(--glass-bg);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--glass-border);
  border-top: 5px solid var(--ktu-gold);
  border-radius: 16px;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease;
}

.policy-grid article:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, 0.6);
}

.policy-grid h3 {
  margin-bottom: 14px;
  font-size: 20px;
  font-weight: 700;
  color: var(--ktu-blue-dark);
}

.policy-grid p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.7;
  font-size: 15px;
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: center;
  margin-top: 60px;
  padding: 40px clamp(20px, 5vw, 72px);
  color: #fff;
  background: linear-gradient(to right, var(--ktu-blue-dark), var(--ktu-blue));
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -50%; left: -10%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.footer-center {
  grid-column: 2;
  text-align: center;
  position: relative;
  z-index: 1;
}

.footer-right {
  grid-column: 3;
  justify-self: end;
  position: relative;
  z-index: 1;
}

.site-footer strong,
.site-footer span {
  display: block;
}

.site-footer strong {
  font-size: 18px;
  font-weight: 700;
}

.site-footer span {
  margin-top: 6px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.site-footer a.scroll-top {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--ktu-gold);
  color: #fff;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  transition: all 0.3s ease;
  padding: 0;
}

.site-footer a.scroll-top:hover {
  transform: translateY(-5px);
  background: #fff;
  color: var(--ktu-gold);
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

@media (max-width: 980px) {
  .hero,
  .split-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .site-header,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-nav {
    justify-content: flex-start;
  }

  .brand {
    min-width: 0;
  }

  .brand-logo {
    width: 128px;
    height: 46px;
  }

  main {
    width: min(100% - 28px, 1180px);
  }

  h1 {
    font-size: 34px;
  }

  .service-grid,
  .guide-list,
  .policy-grid {
    grid-template-columns: 1fr;
  }

  .service-card {
    min-height: 240px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}