/* ==========================================================================
   Tutoring Lab — 공통 스타일
   ========================================================================== */

:root {
  --navy-900: #0b1730;
  --navy-800: #0f2049;
  --navy-700: #16305f;
  --navy-600: #1e3d75;
  --gold-500: #c9a227;
  --gold-400: #dab94a;
  --gold-100: #f7edcf;
  --ink: #14213d;
  --ink-soft: #4b5670;
  --paper: #ffffff;
  --paper-soft: #f6f7fb;
  --line: #e5e8f0;
  --success: #1e7d55;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --shadow-soft: 0 10px 30px rgba(11, 23, 48, 0.08);
  --shadow-strong: 0 20px 50px rgba(11, 23, 48, 0.16);
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 23, 48, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(201, 162, 39, 0.25);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: var(--paper);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.brand .brand-mark {
  color: var(--gold-400);
}

.brand .brand-sub {
  font-size: 11px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.55);
  letter-spacing: 0.02em;
}

.main-nav ul {
  display: flex;
  gap: 32px;
}

.main-nav a {
  color: rgba(255, 255, 255, 0.82);
  font-size: 14.5px;
  font-weight: 600;
  transition: color 0.2s ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--gold-400);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--gold-500);
  color: var(--navy-900);
  font-weight: 700;
  font-size: 14px;
  padding: 10px 18px;
  border-radius: 999px;
  transition: transform 0.15s ease, background 0.2s ease;
}

.header-cta:hover {
  background: var(--gold-400);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--paper);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-cta-mobile {
  display: none;
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  background: radial-gradient(circle at 20% 20%, #16305f 0%, #0b1730 55%, #070f22 100%);
  color: var(--paper);
  overflow: hidden;
  padding: 96px 0 88px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(201, 162, 39, 0.18) 1px, transparent 1px);
  background-size: 26px 26px;
  opacity: 0.5;
  pointer-events: none;
}

.hero .container {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(201, 162, 39, 0.14);
  border: 1px solid rgba(201, 162, 39, 0.4);
  color: var(--gold-400);
  font-size: 13px;
  font-weight: 700;
  padding: 7px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
  letter-spacing: 0.01em;
}

.hero h1 {
  font-size: clamp(30px, 4.2vw, 46px);
  line-height: 1.32;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}

.hero h1 .highlight {
  color: var(--gold-400);
}

.hero p.lead {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.78);
  max-width: 520px;
  margin: 0 0 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-registration {
  display: inline-block;
  margin-top: 14px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.5);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

.hero-registration:hover {
  color: var(--gold-400);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  padding: 14px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-primary {
  background: var(--gold-500);
  color: var(--navy-900);
}

.btn-primary:hover {
  background: var(--gold-400);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(201, 162, 39, 0.28);
}

.btn-outline {
  border-color: rgba(255, 255, 255, 0.35);
  color: var(--paper);
}

.btn-outline:hover {
  border-color: var(--gold-400);
  color: var(--gold-400);
}

.btn-outline-dark {
  border-color: var(--line);
  color: var(--navy-900);
}

.btn-outline-dark:hover {
  border-color: var(--gold-500);
  color: var(--gold-500);
}

.case-strip-cta {
  text-align: center;
  margin-top: 32px;
}

/* ---------- Campus photo ---------- */

.campus-section {
  padding: 64px 0;
}

.campus-frame {
  max-width: 640px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-strong);
}

.campus-frame img {
  width: 100%;
  display: block;
}

.campus-caption {
  text-align: center;
  margin-top: 18px;
  color: var(--ink-soft);
  font-size: 14px;
}

.hero-stats {
  display: flex;
  gap: 28px;
  margin-top: 44px;
  flex-wrap: wrap;
}

.hero-stats .stat-num {
  font-size: 26px;
  font-weight: 800;
  color: var(--gold-400);
}

.hero-stats .stat-label {
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.65);
  margin-top: 2px;
}

.hero-card {
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(6px);
}

.hero-card h3 {
  color: var(--gold-400);
  font-size: 14px;
  margin: 0 0 18px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.hero-card .metric-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.16);
}

.hero-card .metric-row:last-child {
  border-bottom: none;
}

.hero-card .metric-name {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
}

.hero-card .metric-change {
  font-weight: 800;
  font-size: 15px;
  color: #6fe3a3;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ---------- Section shared ---------- */

section {
  padding: 88px 0;
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  color: var(--gold-500);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-head h2 {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
  color: var(--navy-900);
}

.section-head p {
  color: var(--ink-soft);
  font-size: 15.5px;
}

.section-alt {
  background: var(--paper-soft);
}

/* ---------- Philosophy / Premium block ---------- */

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

.philosophy-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 30px 26px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.philosophy-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
}

.philosophy-card .icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--navy-900);
  color: var(--gold-400);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 18px;
}

.philosophy-card h3 {
  font-size: 17.5px;
  font-weight: 800;
  margin: 0 0 10px;
  color: var(--navy-900);
}

.philosophy-card p {
  color: var(--ink-soft);
  font-size: 14.5px;
  margin: 0;
}

/* ---------- Proof / Link cards (3 review entry points) ---------- */

.proof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.proof-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: linear-gradient(165deg, var(--navy-800), var(--navy-900));
  color: var(--paper);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  min-height: 300px;
  overflow: hidden;
  transition: transform 0.22s ease, box-shadow 0.22s ease;
  border: 1px solid rgba(201, 162, 39, 0.18);
}

.proof-card::after {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(201, 162, 39, 0.25), transparent 70%);
}

.proof-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-strong);
  border-color: var(--gold-400);
}

.proof-card .proof-badge {
  align-self: flex-start;
  font-size: 12px;
  font-weight: 800;
  color: var(--gold-400);
  background: rgba(201, 162, 39, 0.14);
  border: 1px solid rgba(201, 162, 39, 0.4);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.proof-card h3 {
  font-size: 21px;
  font-weight: 800;
  line-height: 1.4;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.proof-card p {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14.5px;
  margin: 0 0 24px;
  flex-grow: 1;
}

.proof-card .proof-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 14.5px;
  color: var(--gold-400);
}

.proof-card .proof-link .arrow {
  transition: transform 0.2s ease;
}

.proof-card:hover .proof-link .arrow {
  transform: translateX(4px);
}

/* ---------- Highlight score cases (home teaser) ---------- */

.case-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.case-mini {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}

.case-mini .case-name {
  font-size: 13.5px;
  color: var(--ink-soft);
  font-weight: 600;
  margin-bottom: 12px;
}

.case-mini .case-move {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 800;
}

.case-mini .before {
  font-size: 17px;
  color: #9aa4bd;
  text-decoration: line-through;
}

.case-mini .after {
  font-size: 24px;
  color: var(--success);
}

.case-mini .arrow-ico {
  color: var(--gold-500);
  font-size: 18px;
}

/* ---------- Process ---------- */

.process-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.process-step {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  position: relative;
}

.process-step .step-num {
  font-size: 13px;
  font-weight: 800;
  color: var(--gold-500);
  margin-bottom: 10px;
}

.process-step h4 {
  font-size: 16px;
  font-weight: 800;
  margin: 0 0 8px;
  color: var(--navy-900);
}

.process-step p {
  font-size: 13.5px;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- CTA band ---------- */

.cta-band {
  background: linear-gradient(120deg, var(--navy-900), var(--navy-700));
  color: var(--paper);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-band h2 {
  font-size: 26px;
  font-weight: 800;
  margin: 0 0 8px;
}

.cta-band p {
  color: rgba(255, 255, 255, 0.75);
  margin: 0;
  font-size: 15px;
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--navy-900);
  color: rgba(255, 255, 255, 0.65);
  padding: 48px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
  color: var(--paper);
  font-weight: 800;
  font-size: 18px;
  margin-bottom: 10px;
}

.footer-grid p {
  font-size: 13.5px;
  margin: 0;
  color: rgba(255, 255, 255, 0.6);
}

.footer-col h5 {
  color: var(--paper);
  font-size: 13.5px;
  margin: 0 0 14px;
}

.footer-col ul li {
  font-size: 13.5px;
  margin-bottom: 9px;
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom {
  padding-top: 22px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.4);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- Sub-page: breadcrumb / page hero ---------- */

.page-hero {
  background: linear-gradient(150deg, var(--navy-800), var(--navy-900));
  color: var(--paper);
  padding: 64px 0 56px;
}

.breadcrumb {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 18px;
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.75);
  font-weight: 600;
}

.breadcrumb a:hover {
  color: var(--gold-400);
}

.page-hero h1 {
  font-size: clamp(26px, 3.6vw, 36px);
  font-weight: 800;
  margin: 0 0 14px;
  letter-spacing: -0.02em;
}

.page-hero p {
  color: rgba(255, 255, 255, 0.75);
  font-size: 15.5px;
  max-width: 600px;
  margin: 0;
}

/* ---------- Review cards (subpages) ---------- */

.review-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-soft);
}

.review-card .review-top {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.review-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--navy-900);
  color: var(--gold-400);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 15px;
  flex-shrink: 0;
}

.review-who .name {
  font-weight: 800;
  font-size: 15px;
  color: var(--navy-900);
}

.review-who .tag {
  font-size: 12.5px;
  color: var(--ink-soft);
}

.review-stars {
  color: var(--gold-500);
  font-size: 13px;
  margin-bottom: 10px;
}

.review-card p.quote {
  font-size: 14.5px;
  color: var(--ink-soft);
  margin: 0;
}

.result-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  background: var(--gold-100);
  color: #7a5c0c;
  font-weight: 800;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 999px;
}

/* ---------- Score case cards (grade-up page) ---------- */

.score-cases {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.score-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  box-shadow: var(--shadow-soft);
  text-align: center;
}

.score-card .score-tag {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 800;
  color: var(--gold-500);
  background: var(--gold-100);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.score-card .score-student {
  font-size: 16px;
  font-weight: 800;
  color: var(--navy-900);
  margin-bottom: 4px;
}

.score-card .score-subject {
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 24px;
}

.score-compare {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 22px;
}

.score-box {
  flex: 1;
  border-radius: var(--radius-sm);
  padding: 16px 8px;
}

.score-box.before {
  background: #f2f3f7;
}

.score-box.after {
  background: #e8f6ee;
}

.score-box .score-label {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

.score-box.before .score-value {
  font-size: 24px;
  font-weight: 800;
  color: #7c8296;
}

.score-box.after .score-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--success);
}

.score-arrow {
  color: var(--gold-500);
  font-size: 20px;
  font-weight: 800;
}

.score-card .score-note {
  font-size: 13.5px;
  color: var(--ink-soft);
  border-top: 1px dashed var(--line);
  padding-top: 16px;
}

/* ---------- Admission logos (admission-review page) ---------- */

.school-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 52px;
}

.school-chip {
  background: var(--navy-900);
  color: var(--paper);
  border-radius: var(--radius-md);
  padding: 22px;
  text-align: center;
}

.school-chip .school-name {
  font-weight: 800;
  font-size: 17px;
  color: var(--gold-400);
  margin-bottom: 4px;
}

.school-chip .school-type {
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.6);
}

/* ---------- Responsive ---------- */

@media (max-width: 960px) {
  .hero .container {
    grid-template-columns: 1fr;
  }

  .philosophy-grid,
  .proof-grid,
  .case-strip,
  .review-grid,
  .score-cases,
  .school-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--navy-900);
    border-bottom: 1px solid rgba(201, 162, 39, 0.25);
    box-shadow: var(--shadow-strong);
  }

  .main-nav.open {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 8px 24px 18px;
  }

  .main-nav a {
    display: block;
    padding: 13px 2px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nav-cta-mobile {
    display: block;
    margin-top: 14px;
    text-align: center;
    background: var(--gold-500);
    color: var(--navy-900);
    font-weight: 700;
    padding: 12px;
    border-radius: 999px;
  }

  .philosophy-grid,
  .proof-grid,
  .case-strip,
  .review-grid,
  .score-cases,
  .school-strip,
  .process-list {
    grid-template-columns: 1fr;
  }

  section {
    padding: 60px 0;
  }

  .cta-band {
    padding: 40px 26px;
  }

  .header-cta {
    display: none;
  }
}