/* ============================================================
   JBC ATHENAEUM — Global Stylesheet
   Architecture: CSS Custom Properties + Flexbox/Grid
   Naming: Descriptive BEM-lite conventions
   ============================================================ */

/* ── 1. DESIGN TOKENS ── */
:root {
  /* Brand Colors */
  --color-navy:       #002147;
  --color-navy-dark:  #001b3a;
  --color-gold:       #c49b63;
  --color-gold-dark:  #b38a52;

  /* Slate Palette (mirrors Tailwind slate scale) */
  --color-slate-50:   #f8fafc;
  --color-slate-100:  #f1f5f9;
  --color-slate-200:  #e2e8f0;
  --color-slate-300:  #cbd5e1;
  --color-slate-400:  #94a3b8;
  --color-slate-500:  #64748b;
  --color-slate-600:  #475569;
  --color-slate-700:  #334155;
  --color-slate-800:  #1e293b;

  /* Semantic */
  --color-bg:         var(--color-slate-50);
  --color-text:       var(--color-slate-800);
  --color-border:     var(--color-slate-200);

  /* Typography */
  --font-sans:  system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-serif: Georgia, "Times New Roman", Times, serif;

  /* Spacing Scale */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Borders & Radius */
  --radius-sm:   2px;
  --radius:      4px;
  --radius-md:   6px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow:     0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md:  0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px 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);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

  /* Glassmorphism */
  --glass-bg:     rgba(255, 255, 255, 0.75);
  --glass-border: rgba(255, 255, 255, 0.60);
  --glass-blur:   blur(24px);

  /* Layout */
  --max-w-7xl: 80rem;
  --max-w-5xl: 64rem;
  --max-w-4xl: 56rem;
  --max-w-3xl: 48rem;
  --max-w-2xl: 42rem;

  /* Transitions */
  --transition-colors: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
  --transition-transform: transform 0.2s ease-out;
  --transition-all: all 0.2s ease-out;
}

/* ── 2. RESET & BASE ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

button {
  cursor: pointer;
  font-family: var(--font-sans);
  border: none;
  background: none;
}

input, textarea, select {
  font-family: var(--font-sans);
}

ul, ol {
  list-style: none;
}

/* ── 3. UTILITY CLASSES ── */
.container {
  max-width: var(--max-w-7xl);
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container--5xl { max-width: var(--max-w-5xl); }
.container--4xl { max-width: var(--max-w-4xl); }
.container--3xl { max-width: var(--max-w-3xl); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ── 4. HEADER ── */
.site-header {
  width: 100%;
  position: relative;
  font-family: var(--font-sans);
  z-index: 50;
}

/* Top Utility Bar */
.header__utility-bar {
  background-color: var(--color-navy-dark);
  color: var(--color-slate-300);
  font-size: 0.75rem;
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: var(--space-6);
}

/* Search in utility bar */
.header__search {
  position: relative;
}

.header__search-input-wrap {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius);
  padding: var(--space-1) var(--space-3);
  color: var(--color-slate-300);
  transition: var(--transition-colors);
}

.header__search-input-wrap:focus-within {
  background: rgba(255,255,255,0.15);
  color: #fff;
}

.header__search-icon {
  flex-shrink: 0;
  margin-right: var(--space-2);
  width: 14px;
  height: 14px;
}

.header__search-field {
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-slate-300);
  font-size: 0.75rem;
  width: 12rem;
}

.header__search-field::placeholder {
  color: rgba(203,213,225,0.7);
}

/* Search Dropdown */
.header__search-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  width: 16rem;
  background: #fff;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius);
  color: var(--color-slate-800);
  z-index: 100;
  max-height: 20rem;
  overflow-y: auto;
}

.header__search-dropdown.is-open {
  display: block;
}

.header__search-dropdown-label {
  padding: var(--space-1) var(--space-3);
  font-size: 0.625rem;
  font-weight: 700;
  color: var(--color-slate-400);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--color-slate-50);
  border-bottom: 1px solid var(--color-slate-100);
}

.header__search-result {
  padding: var(--space-2) var(--space-4);
  border-left: 2px solid transparent;
  transition: var(--transition-colors);
  cursor: pointer;
}

.header__search-result:hover {
  background: var(--color-slate-50);
  border-left-color: var(--color-navy);
}

.header__search-result-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-navy);
}

.header__search-result-meta {
  font-size: 0.625rem;
  color: var(--color-slate-500);
  margin-top: 2px;
  text-transform: uppercase;
}

.header__search-no-results {
  padding: var(--space-4);
  font-size: 0.75rem;
  color: var(--color-slate-500);
  text-align: center;
}

/* Utility bar links/buttons */
.header__util-link {
  color: var(--color-slate-300);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: none;
  border: none;
  cursor: pointer;
  transition: var(--transition-colors);
}

.header__util-link:hover { color: #fff; }

.header__user-info {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header__user-text {
  text-align: right;
}

.header__user-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
}

.header__user-role {
  font-size: 0.625rem;
  color: rgba(255,255,255,0.7);
  text-transform: uppercase;
}

.header__btn--outline {
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
  font-size: 0.75rem;
}

.header__btn--gold-outline {
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
  font-size: 0.75rem;
}

/* Main Nav Bar */
.header__main-bar {
  background: #fff;
  border-bottom: 1px solid var(--color-slate-200);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.header__main-bar-inner {
  max-width: var(--max-w-7xl);
  margin-inline: auto;
  padding-inline: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 5rem;
}

/* Logo */
.header__brand {
  display: flex;
  align-items: center;
  cursor: pointer;
  text-decoration: none;
  gap: var(--space-3);
}

.header__brand-icon {
  width: 2.5rem;
  height: 2.5rem;
  background: var(--color-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.header__brand-icon svg {
  color: #fff;
}

.header__brand-name {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--color-navy);
  line-height: 1;
}

.header__brand-tagline {
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: -0.025em;
  color: var(--color-slate-400);
  margin-top: 2px;
}

/* Primary Navigation */
.header__nav {
  display: none;
  height: 100%;
  align-items: center;
  gap: var(--space-8);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.header__nav-link {
  color: var(--color-slate-500);
  cursor: pointer;
  transition: var(--transition-colors);
  display: flex;
  align-items: center;
  height: 100%;
  padding-top: var(--space-1);
  background: none;
  border: none;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
}

.header__nav-link:hover {
  color: var(--color-navy);
}

/* Faculties mega-menu trigger */
.header__nav-faculties {
  position: static;
  display: flex;
  align-items: center;
  height: 100%;
  cursor: pointer;
  color: var(--color-navy);
  border-bottom: 2px solid transparent;
  transition: var(--transition-colors);
}

.header__nav-faculties:hover {
  border-bottom-color: var(--color-navy);
}

.header__nav-faculties-label {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  height: 100%;
  padding-top: var(--space-1);
}

.header__nav-faculties-label .chevron {
  width: 16px;
  height: 16px;
  transition: transform 0.2s ease-out;
}

.header__nav-faculties:hover .chevron {
  transform: rotate(180deg);
}

/* Mega Menu */
.mega-menu {
  position: absolute;
  left: 0;
  top: 100%;
  width: 100%;
  background: var(--color-navy);
  color: #fff;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  box-shadow: var(--shadow-2xl);
  overflow: hidden;
  pointer-events: none;
  border-top: 1px solid rgba(255,255,255,0.1);
  z-index: 40;
}

.header__nav-faculties:hover .mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mega-menu__inner {
  max-width: var(--max-w-7xl);
  margin-inline: auto;
  padding: var(--space-12) var(--space-4);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-12);
}

.mega-menu__col-title {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-style: italic;
  color: var(--color-gold);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.mega-menu__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mega-menu__item {
  font-size: 0.875rem;
  font-weight: 300;
  color: var(--color-slate-300);
  cursor: pointer;
  transition: var(--transition-colors);
  text-decoration: none;
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-sans);
}

.mega-menu__item:hover { color: #fff; }

.mega-menu__item--dimmed {
  font-size: 0.75rem;
  font-style: italic;
  opacity: 0.5;
  margin-top: var(--space-2);
}

.mega-menu__featured {
  background: rgba(255,255,255,0.05);
  padding: var(--space-4);
  border-radius: var(--radius);
}

.mega-menu__featured-label {
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-slate-400);
  margin-bottom: var(--space-1);
}

.mega-menu__featured-cta {
  color: var(--color-gold);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  margin-top: var(--space-3);
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-sans);
  text-decoration: none;
}

/* Upload Notes CTA */
.header__btn--cta {
  background: var(--color-gold);
  color: #fff;
  padding: var(--space-2) var(--space-6);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: var(--transition-colors);
  box-shadow: var(--shadow-sm);
  border: none;
  cursor: pointer;
  text-decoration: none;
  font-family: var(--font-sans);
  display: inline-block;
  margin-left: var(--space-4);
}

.header__btn--cta:hover {
  background: var(--color-gold-dark);
}

/* Mobile Hamburger */
.header__mobile-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.header__mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-navy);
  transition: var(--transition-all);
}

/* Mobile Nav Drawer */
.header__mobile-nav {
  display: none;
  background: #fff;
  border-top: 1px solid var(--color-slate-200);
  padding: var(--space-4);
  flex-direction: column;
  gap: var(--space-2);
}

.header__mobile-nav.is-open {
  display: flex;
}

.header__mobile-nav a,
.header__mobile-nav button {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-slate-600);
  background: none;
  border: none;
  text-align: left;
  width: 100%;
  cursor: pointer;
  text-decoration: none;
  font-family: var(--font-sans);
  border-radius: var(--radius);
  transition: var(--transition-colors);
}

.header__mobile-nav a:hover,
.header__mobile-nav button:hover {
  background: var(--color-slate-50);
  color: var(--color-navy);
}

/* ── 5. HERO ── */
.hero {
  position: relative;
  width: 100%;
  margin-bottom: 8rem;
}

.hero__image-wrap {
  width: 100%;
  height: 400px;
  background: var(--color-slate-300);
  position: relative;
  overflow: hidden;
}

.hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 27, 58, 0.2);
  mix-blend-mode: multiply;
}

.hero__content-wrapper {
  max-width: var(--max-w-7xl);
  margin-inline: auto;
  padding-inline: var(--space-4);
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__card {
  position: absolute;
  bottom: -6rem;
  left: var(--space-4);
  right: var(--space-4);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-2xl);
  padding: var(--space-8);
  pointer-events: auto;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-6);
  line-height: 1.2;
}

.hero__description {
  color: var(--color-slate-700);
  font-size: 1.125rem;
  font-weight: 300;
  line-height: 1.75;
  margin-bottom: var(--space-10);
}

/* ── 6. BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: var(--transition-all);
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  text-decoration: none;
}

.btn--primary {
  background: var(--color-gold);
  color: #fff;
  padding: var(--space-4) var(--space-8);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  background: var(--color-gold-dark);
  box-shadow: var(--shadow);
}

.btn--primary:hover .btn__arrow {
  transform: translateX(6px);
}

.btn--navy {
  background: var(--color-navy);
  color: #fff;
  padding: var(--space-4) var(--space-8);
}

.btn--navy:hover { background: var(--color-navy-dark); }

.btn--outline-navy {
  border: 2px solid var(--color-navy);
  color: var(--color-navy);
  padding: var(--space-3) var(--space-8);
  background: transparent;
}

.btn--outline-navy:hover {
  background: var(--color-navy);
  color: #fff;
}

.btn--outline-navy:hover .btn__arrow {
  transform: translateX(6px);
}

.btn__arrow {
  transition: var(--transition-transform);
}

/* ── 7. FEATURE SPLIT ── */
.feature-split {
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-slate-200);
  background: #fff;
  overflow: hidden;
  margin-bottom: var(--space-24);
}

.feature-split__image-col {
  width: 100%;
  height: 16rem;
  position: relative;
}

.feature-split__image-col img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feature-split__content-col {
  padding: var(--space-12);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.feature-split__title {
  font-family: var(--font-serif);
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-6);
}

.feature-split__description {
  color: var(--color-slate-600);
  font-size: 1.125rem;
  font-weight: 300;
  line-height: 1.75;
  margin-bottom: var(--space-10);
}

/* ── 8. PAGE HEADER (shared across views) ── */
.page-header {
  text-align: center;
  margin-bottom: var(--space-12);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-slate-200);
}

.page-header--left {
  text-align: left;
}

.page-header__title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-4);
}

.page-header__subtitle {
  color: var(--color-slate-500);
  max-width: var(--max-w-2xl);
  margin-inline: auto;
}

/* ── 9. PAGE LAYOUT WRAPPER ── */
.page-view {
  padding-block: var(--space-12);
  flex: 1;
}

.page-view--padded-bottom {
  padding-bottom: var(--space-24);
}

/* ── 10. CARDS ── */
.card {
  background: #fff;
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.card--hover {
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  cursor: pointer;
}

.card--hover:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-gold);
}

/* ── 11. SEMESTERS VIEW ── */
.semesters-view {
  padding-block: var(--space-12);
}

.faculty-section {
  margin-bottom: var(--space-16);
}

.faculty-section__title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.faculty-section__badge {
  width: 2rem;
  height: 2rem;
  background: var(--color-gold);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 700;
  flex-shrink: 0;
}

.semester-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.semester-card {
  background: #fff;
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.semester-card:hover {
  box-shadow: var(--shadow-md);
}

.semester-card__label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-slate-400);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-slate-100);
}

.subject-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.subject-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2);
  margin-inline: calc(var(--space-2) * -1);
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition-colors);
  text-decoration: none;
  color: inherit;
}

.subject-item:hover {
  background: var(--color-slate-50);
}

.subject-item:hover .subject-item__name {
  color: var(--color-navy);
}

.subject-item__name {
  font-weight: 500;
  color: var(--color-slate-700);
  transition: var(--transition-colors);
}

.subject-item__count {
  font-size: 0.625rem;
  background: var(--color-slate-100);
  color: var(--color-slate-500);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  font-weight: 500;
  letter-spacing: 0.05em;
}

/* ── 12. RESOURCES VIEW ── */
.resource-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.resource-card {
  background: #fff;
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: border-color 0.2s ease;
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: inherit;
}

.resource-card:hover {
  border-color: var(--color-gold);
}

.resource-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.resource-card__icon {
  padding: var(--space-2);
  background: var(--color-slate-50);
  border-radius: var(--radius);
  color: var(--color-navy);
  transition: var(--transition-colors);
  display: flex;
}

.resource-card:hover .resource-card__icon {
  background: var(--color-navy);
  color: #fff;
}

.resource-card__badge {
  font-size: 0.625rem;
  background: var(--color-slate-100);
  color: var(--color-slate-500);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  font-weight: 500;
}

.resource-card__title {
  font-weight: 700;
  color: var(--color-slate-800);
  margin-bottom: var(--space-1);
  transition: var(--transition-colors);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.resource-card:hover .resource-card__title {
  color: var(--color-navy);
}

.resource-card__subject {
  font-size: 0.75rem;
  color: var(--color-gold);
  font-weight: 500;
  margin-bottom: var(--space-4);
}

.resource-card__footer {
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-slate-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--color-slate-500);
}

.resource-empty {
  grid-column: 1/-1;
  padding: var(--space-12) 0;
  text-align: center;
  color: var(--color-slate-500);
}

/* ── 13. NOTE VIEWER ── */
.note-viewer-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  padding-block: var(--space-12);
}

.note-viewer__sidebar {
  width: 100%;
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-slate-200);
}

.note-viewer__sidebar-badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--color-slate-200);
  color: var(--color-slate-600);
  border-radius: var(--radius-full);
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-6);
}

.note-viewer__sidebar-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-6);
}

.note-viewer__sidebar-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-slate-400);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.note-list-item {
  padding: var(--space-4);
  border-left: 4px solid transparent;
  cursor: pointer;
  transition: var(--transition-all);
  text-decoration: none;
  display: block;
  color: inherit;
}

.note-list-item:hover {
  background: var(--color-slate-50);
  border-left-color: var(--color-gold);
}

.note-list-item.is-active {
  background: rgba(219, 234, 254, 0.5);
  border-left-color: var(--color-navy);
  box-shadow: var(--shadow-sm);
}

.note-list-item__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-2);
}

.note-list-item__title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-slate-800);
  margin-bottom: var(--space-1);
  transition: var(--transition-colors);
}

.note-list-item.is-active .note-list-item__title,
.note-list-item:hover .note-list-item__title {
  color: var(--color-navy);
}

.note-list-item__viewing-badge {
  font-size: 0.5625rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  background: var(--color-navy);
  color: #fff;
  padding: 2px var(--space-1);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.note-list-item__meta {
  font-size: 0.75rem;
  color: var(--color-slate-500);
}

.note-viewer__main {
  flex: 1;
}

.note-viewer__doc-header {
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-slate-200);
}

.note-viewer__doc-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-4);
}

.note-viewer__doc-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-6);
  font-size: 0.875rem;
  color: var(--color-slate-500);
}

.note-viewer__doc-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.note-viewer__doc-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
}

.note-viewer__btn-share {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--color-slate-500);
  background: none;
  border: none;
  cursor: pointer;
  transition: var(--transition-colors);
  font-size: 0.875rem;
  font-family: var(--font-sans);
}

.note-viewer__btn-share:hover { color: var(--color-navy); }

.note-viewer__btn-open {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--color-navy);
  color: #fff;
  padding: 6px var(--space-4);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  transition: var(--transition-colors);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.note-viewer__btn-open:hover { background: var(--color-navy-dark); }

.note-viewer__iframe-wrap {
  width: 100%;
  height: 600px;
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.note-viewer__iframe-fallback {
  position: absolute;
  inset: 0;
  background: var(--color-slate-50);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-8);
  color: var(--color-slate-400);
  z-index: 0;
  pointer-events: none;
}

.note-viewer__iframe-fallback-title {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(0, 33, 71, 0.4);
  margin-bottom: var(--space-2);
}

.note-viewer__iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
  z-index: 10;
}

.note-viewer__empty {
  width: 100%;
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-12);
  background: #fff;
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius);
}

/* ── 14. CONTRIBUTE FORM ── */
.contribute-info-box {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  background: #eff6ff;
  padding: var(--space-4);
  border-left: 4px solid var(--color-navy);
  margin-bottom: var(--space-8);
}

.contribute-info-box__icon {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--color-navy);
}

.contribute-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  text-align: center;
  padding-inline: var(--space-4);
}

.contribute-step__icon-wrap {
  width: 3rem;
  height: 3rem;
  background: var(--color-slate-100);
  color: var(--color-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  margin: 0 auto var(--space-4);
}

.contribute-step__icon-wrap--gold {
  color: var(--color-gold);
}

.contribute-step__title {
  font-weight: 700;
  color: var(--color-slate-800);
  margin-bottom: var(--space-2);
}

.contribute-step__desc {
  font-size: 0.75rem;
  color: var(--color-slate-500);
}

/* ── 15. FORM ELEMENTS ── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-slate-500);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  border: 1px solid var(--color-slate-300);
  padding: var(--space-3);
  font-size: 0.875rem;
  color: var(--color-slate-800);
  background: var(--color-slate-50);
  transition: border-color 0.15s ease;
  outline: none;
  font-family: var(--font-sans);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-navy);
}

.form-input--icon-left {
  padding-left: 2.5rem;
}

.form-input-wrap {
  position: relative;
}

.form-input-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-slate-400);
  display: flex;
  pointer-events: none;
}

.form-select {
  appearance: none;
  border-radius: 0;
}

.form-textarea {
  resize: vertical;
}

.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  padding-top: var(--space-4);
}

.form-footer-note {
  font-size: 0.75rem;
  color: var(--color-slate-500);
  text-align: center;
}

/* ── 16. LIBRARY ARCHIVES VIEW ── */
.library-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  width: 100%;
}

.library-search-card {
  background: #fff;
  border: 1px solid var(--color-slate-200);
  box-shadow: var(--shadow-sm);
  padding: var(--space-8);
  width: 100%;
  max-width: 48rem;
  border-radius: var(--radius);
}

.library-search-form {
  position: relative;
  box-shadow: var(--shadow-sm);
  width: 100%;
}

.library-search-input {
  width: 100%;
  border: 2px solid var(--color-slate-200);
  padding: var(--space-4) 8rem var(--space-4) var(--space-6);
  font-size: 1.125rem;
  border-radius: var(--radius-full);
  outline: none;
  transition: border-color 0.15s ease;
  font-family: var(--font-sans);
}

.library-search-input:focus {
  border-color: var(--color-navy);
}

.library-search-btn {
  position: absolute;
  right: var(--space-2);
  top: var(--space-2);
  bottom: var(--space-2);
  background: var(--color-navy);
  color: #fff;
  padding-inline: var(--space-6);
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-sans);
  transition: var(--transition-colors);
}

.library-search-btn:hover { background: var(--color-navy-dark); }

.library-attribution {
  font-size: 0.75rem;
  color: var(--color-slate-400);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  margin-top: var(--space-8);
}

/* ── 17. INFO VIEW ── */
.info-status-box {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  background: #eff6ff;
  padding: var(--space-4);
  border-left: 4px solid var(--color-navy);
  margin-bottom: var(--space-8);
}

.info-content h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-4);
  margin-top: var(--space-6);
}

.info-content h2:first-child { margin-top: 0; }

.info-content p {
  color: var(--color-slate-600);
  line-height: 1.75;
}

.info-content ul {
  list-style: disc;
  padding-left: var(--space-6);
  color: var(--color-slate-600);
  margin-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.info-content ol {
  list-style: decimal;
  padding-left: var(--space-5);
  color: var(--color-slate-600);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.info-content strong { color: var(--color-slate-800); font-weight: 700; }

.info-content .warning-box {
  background: #fefce8;
  border-left: 4px solid #eab308;
  padding: var(--space-4);
  margin-bottom: var(--space-8);
}

.info-content .warning-box p {
  color: #713f12;
  font-weight: 500;
}

.faculty-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.faculty-card {
  border: 1px solid var(--color-slate-200);
  padding: var(--space-6);
  border-radius: var(--radius);
}

.faculty-card__name {
  font-weight: 700;
  color: var(--color-navy);
  font-size: 1.125rem;
  margin-bottom: var(--space-1);
}

.faculty-card__role {
  color: var(--color-gold);
  font-size: 0.875rem;
  margin-bottom: var(--space-4);
}

.faculty-card__contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: 0.875rem;
  color: var(--color-slate-600);
}

.faculty-card__contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.contact-grid {
  background: var(--color-slate-50);
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  color: var(--color-slate-700);
}

.contact-grid__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.contact-grid__item svg {
  color: var(--color-gold);
  flex-shrink: 0;
}

.support-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.support-box {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius);
  padding: var(--space-6);
  text-align: center;
}

.faq-item {
  border-bottom: 1px solid var(--color-slate-200);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-4);
}

.faq-item:last-child { border-bottom: none; }

.faq-item__q {
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-2);
}

.faq-item__a {
  font-size: 0.875rem;
  color: var(--color-slate-600);
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.sitemap-col__title {
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-slate-200);
}

.sitemap-col__list li {
  font-size: 0.875rem;
  color: var(--color-slate-600);
  padding-block: var(--space-1);
}

.success-state {
  text-align: center;
  padding: var(--space-12) 0;
}

.success-state__icon {
  width: 4rem;
  height: 4rem;
  background: #dcfce7;
  color: #16a34a;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
}

/* ── 18. FOOTER ── */
.site-footer {
  width: 100%;
  font-family: var(--font-sans);
  margin-top: auto;
}

.footer__newsletter {
  background: #fff;
  border-top: 1px solid var(--color-slate-200);
  border-bottom: 1px solid var(--color-slate-200);
  padding: var(--space-16) var(--space-4);
}

.footer__newsletter-inner {
  max-width: var(--max-w-5xl);
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
}

.footer__newsletter-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-2);
}

.footer__newsletter-desc {
  color: var(--color-slate-500);
  font-weight: 300;
  font-size: 0.875rem;
}

.footer__newsletter-form {
  display: flex;
  width: 100%;
  max-width: 28rem;
}

.footer__newsletter-input-wrap {
  position: relative;
  flex: 1;
}

.footer__newsletter-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-slate-400);
  display: flex;
  pointer-events: none;
}

.footer__newsletter-input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) 3rem;
  background: var(--color-slate-50);
  border: 1px solid var(--color-slate-200);
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.15s ease;
  font-family: var(--font-sans);
}

.footer__newsletter-input:focus { border-color: var(--color-navy); }

.footer__newsletter-btn {
  background: var(--color-navy);
  color: #fff;
  padding: var(--space-3) var(--space-6);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-colors);
  font-family: var(--font-sans);
}

.footer__newsletter-btn:hover { background: var(--color-navy-dark); }

/* Dark Footer */
.footer__dark {
  background: var(--color-navy-dark);
  color: var(--color-slate-300);
  padding: var(--space-20) var(--space-4) var(--space-8);
}

.footer__dark-inner {
  max-width: var(--max-w-7xl);
  margin-inline: auto;
}

.footer__quote-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: var(--space-20);
}

.footer__quote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.875rem;
  color: #fff;
  max-width: 48rem;
  line-height: 1.4;
  margin-bottom: var(--space-8);
}

.footer__social-list {
  display: flex;
  gap: var(--space-6);
}

.footer__social-link {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255,255,255,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-colors);
  color: #fff;
}

.footer__social-link:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.4);
}

.footer__links-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-16);
}

.footer__links-col-title {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-style: italic;
  color: var(--color-gold);
  margin-bottom: var(--space-6);
}

.footer__links-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link-btn {
  font-size: 0.875rem;
  font-weight: 300;
  color: var(--color-slate-300);
  background: none;
  border: none;
  cursor: pointer;
  transition: var(--transition-colors);
  font-family: var(--font-sans);
  text-align: left;
  padding: 0;
  text-decoration: none;
}

.footer__link-btn:hover { color: #fff; }

.footer__copyright {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-8);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.75rem;
  color: var(--color-slate-500);
  font-weight: 300;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ── 19. LOGIN MODAL ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.modal-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-2xl);
  width: 100%;
  max-width: 28rem;
  overflow: hidden;
  transform: scale(0.95);
  transition: transform 0.2s ease;
}

.modal-overlay.is-open .modal {
  transform: scale(1);
}

.modal__header {
  background: var(--color-navy);
  padding: var(--space-6);
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal__title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-gold);
}

.modal__subtitle {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.7);
  margin-top: var(--space-1);
}

.modal__close {
  color: rgba(255,255,255,0.7);
  background: none;
  border: none;
  cursor: pointer;
  transition: var(--transition-colors);
  display: flex;
}

.modal__close:hover { color: #fff; }

.modal__body {
  padding: var(--space-6);
}

.modal__form-fields {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.modal__error {
  background: #fef2f2;
  color: #dc2626;
  padding: var(--space-3);
  font-size: 0.875rem;
  border-radius: var(--radius);
  border: 1px solid #fecaca;
}

.modal__submit {
  width: 100%;
  background: var(--color-gold);
  color: #fff;
  padding: var(--space-3);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: none;
  cursor: pointer;
  transition: var(--transition-colors);
  font-family: var(--font-sans);
  margin-top: var(--space-4);
}

.modal__submit:hover { background: var(--color-gold-dark); }
.modal__submit:disabled { opacity: 0.5; cursor: not-allowed; }

.modal__footer-note {
  font-size: 0.75rem;
  color: var(--color-slate-500);
  text-align: center;
  margin-top: var(--space-4);
}

.modal__footer-note span {
  color: var(--color-navy);
  font-weight: 700;
  cursor: pointer;
}

/* ── 20. RESPONSIVE BREAKPOINTS ── */

/* md: 768px */
@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-12);
  }

  .header__utility-bar {
    padding-inline: var(--space-12);
  }

  .header__main-bar-inner {
    padding-inline: var(--space-12);
  }

  .header__nav {
    display: flex;
  }

  .header__mobile-toggle {
    display: none;
  }

  /* Hero */
  .hero__image-wrap {
    height: 540px;
  }

  .hero__card {
    bottom: -8rem;
    left: var(--space-12);
    right: auto;
    width: 640px;
    padding: var(--space-14);
  }

  .hero__title {
    font-size: 3rem;
  }

  .hero {
    margin-bottom: 10rem;
  }

  /* Feature Split */
  .feature-split {
    flex-direction: row;
  }

  .feature-split__image-col {
    width: 50%;
    height: auto;
    min-height: 400px;
  }

  .feature-split__content-col {
    width: 50%;
    padding: var(--space-24);
  }

  .feature-split__title {
    font-size: 3rem;
  }

  /* Semesters */
  .semester-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Resources */
  .resource-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Note Viewer */
  .note-viewer-layout {
    flex-direction: row;
    align-items: flex-start;
  }

  .note-viewer__sidebar {
    width: 25%;
    padding-right: var(--space-8);
    padding-bottom: 0;
    border-bottom: none;
    border-right: 1px solid var(--color-slate-200);
    flex-shrink: 0;
  }

  .note-viewer__iframe-wrap {
    height: 800px;
  }

  .note-viewer__doc-title {
    font-size: 2.5rem;
  }

  /* Footer */
  .footer__newsletter-inner {
    flex-direction: row;
    text-align: left;
  }

  .footer__links-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer__copyright {
    flex-direction: row;
  }

  /* Forms */
  .form-grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Contribute steps */
  .contribute-steps {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Info view */
  .faculty-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  /* Footer newsletter text */
  .footer__newsletter-inner > div {
    text-align: left;
  }
}

/* lg: 1024px */
@media (min-width: 1024px) {
  .hero__card {
    width: 720px;
  }

  .semester-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .resource-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}