:root {
  /* Boğaziçi University official brand colors (Kurumsal Kimlik Kılavuzu 2020):
     Navy = Pantone 7686C / #1e4a8b, Sky = Pantone 297C / #8cc8ea.
     All other colors below are tints/shades derived from these two. */
  --navy: #1e4a8b;
  --navy-dark: #12315c;
  --navy-mid: #4a7fb5;
  --sky: #8cc8ea;
  --sky-pale: #eaf5fc;
  --gold: #8cc8ea; /* legacy variable name kept for compatibility; now maps to sky accent */
  --bg: #f6f8fb;
  --card: #ffffff;
  --ink: #1c232e;
  --muted: #566072;
  --border: #dbe6f0;
  --tier-full: #1e4a8b;
  --tier-inter: #4a7fb5;
  --tier-passive: #8cc8ea;
  --max-width: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Georgia", "Times New Roman", serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 17px;
}

h1, h2, h3, h4, nav, .pill, .tag, button, .btn {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

a { color: var(--navy); text-decoration: none; }
a:hover { text-decoration: underline; }

header.site-header {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-dark) 100%);
  color: #fff;
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: #fff;
}
.brand small {
  display: block;
  font-weight: 400;
  font-size: 0.78rem;
  color: var(--sky);
  letter-spacing: 0.03em;
}

nav.main-nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
nav.main-nav a {
  color: #eaf5fc;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: background 0.15s;
}
nav.main-nav a:hover, nav.main-nav a.active {
  background: rgba(255,255,255,0.16);
  text-decoration: none;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 36px 24px 80px;
}

.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 60%, var(--navy-dark) 100%);
  color: #fff;
  padding: 64px 24px;
  margin-bottom: 0;
}
.hero-inner { max-width: var(--max-width); margin: 0 auto; }
.hero h1 { font-size: 2.35rem; margin: 0 0 10px; line-height: 1.2; }
.hero .subtitle { font-size: 1.2rem; color: var(--sky-pale); margin: 0 0 20px; font-family: Georgia, serif; }
.hero .meta-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }

.pill {
  display: inline-block;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.35);
  color: #fff;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
}

.btn {
  display: inline-block;
  background: var(--sky);
  color: var(--navy-dark);
  padding: 11px 22px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.95rem;
  margin-top: 22px;
  margin-right: 10px;
}
.btn.secondary {
  background: transparent;
  border: 1.5px solid rgba(255,255,255,0.6);
  color: #fff;
}
.btn:hover { text-decoration: none; opacity: 0.92; }

section { margin: 48px 0; }
section > h2 {
  color: var(--navy);
  font-size: 1.55rem;
  border-bottom: 3px solid var(--sky);
  padding-bottom: 8px;
  margin-bottom: 20px;
}
section > h3 {
  color: var(--navy);
  font-size: 1.2rem;
  margin-top: 28px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
@media (max-width: 800px) { .card-grid { grid-template-columns: 1fr; } }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.card h4 { margin: 0 0 8px; color: var(--navy); font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.96rem; }

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  margin: 16px 0;
  font-size: 0.95rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
th, td {
  border: 1px solid var(--border);
  padding: 10px 13px;
  text-align: left;
  vertical-align: top;
}
th {
  background: var(--navy);
  color: #fff;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 600;
  font-size: 0.87rem;
}
tr:nth-child(even) td { background: var(--sky-pale); }

.note {
  background: var(--sky-pale);
  border-left: 4px solid var(--sky);
  padding: 12px 16px;
  border-radius: 4px;
  font-size: 0.94rem;
  color: var(--navy-dark);
  margin: 16px 0;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 18px;
  margin-bottom: 10px;
  background: var(--card);
}
.faq-item .q {
  font-weight: 700;
  color: var(--navy);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: 0 0 6px;
}
.faq-item .a { margin: 0; color: var(--ink); }

.toc {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 24px;
  margin-bottom: 36px;
}
.toc h4 { margin: 0 0 10px; color: var(--navy); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; }
.toc ul { margin: 0; padding-left: 20px; columns: 2; }
@media (max-width: 700px) { .toc ul { columns: 1; } }

/* Engagement Tiers — a progressive navy→sky ramp: full strength = full presence */
.tier-badge {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
}
.tier-full { background: var(--tier-full); color: #fff; }
.tier-inter { background: var(--tier-inter); color: #fff; }
.tier-passive { background: var(--tier-passive); color: var(--navy-dark); }

/* UNESCO levels — same progressive ramp: Acquire (lightest) → Create (deepest) */
.level-badge {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
}
.level-acquire { background: var(--sky); color: var(--navy-dark); }
.level-deepen { background: var(--navy-mid); color: #fff; }
.level-create { background: var(--navy); color: #fff; }

/* Task type — Mission (light, frequent, low-stakes) vs Major (dark, weighty) */
.tasktype {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 700;
  margin-right: 6px;
}
.tasktype-mission { background: var(--sky-pale); color: var(--navy); border: 1px solid var(--sky); }
.tasktype-major { background: var(--navy); color: #fff; }

.week-block {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
  margin-bottom: 22px;
  background: var(--card);
}
.week-block h2 {
  margin-top: 0;
  font-size: 1.25rem;
  color: var(--navy);
  border-bottom: none;
  padding-bottom: 0;
}
.week-block .day-label {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 700;
  color: var(--navy-mid);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  margin-top: 16px;
  margin-bottom: 6px;
}
.week-block ul { margin: 6px 0 0; padding-left: 22px; }
.week-block .optional-flag {
  font-style: italic;
  color: var(--muted);
  font-size: 0.9rem;
}

footer.site-footer {
  background: var(--navy-dark);
  color: var(--sky-pale);
  text-align: center;
  padding: 26px 24px;
  font-size: 0.87rem;
}
footer.site-footer a { color: var(--sky); }

.builds-on {
  display: inline-block;
  font-size: 0.84rem;
  color: var(--muted);
  font-style: italic;
  margin-bottom: 10px;
}

.tag {
  display: inline-block;
  background: var(--sky-pale);
  color: var(--navy);
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 700;
  margin-right: 6px;
}

blockquote {
  border-left: 4px solid var(--border);
  margin: 16px 0;
  padding: 4px 16px;
  color: var(--muted);
  font-style: italic;
}

/* Deadlines: a warm accent so due dates stand out against the navy/sky brand palette */
.due {
  display: inline-block;
  background: #fdecea;
  color: #8a1c14;
  border: 1px solid #f1b5ae;
  border-radius: 6px;
  padding: 2px 10px;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 700;
  font-size: 0.82rem;
  white-space: nowrap;
  margin-right: 6px;
}
.due-event { background: var(--navy); color: #fff; border-color: var(--navy); }
.wk { color: var(--muted); font-size: 0.9rem; margin-right: 8px; }
.week-dates {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.95rem;
  white-space: nowrap;
}
td.date-col { white-space: nowrap; font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; font-weight: 700; color: var(--navy-dark); }
td.date-col small { font-weight: 400; color: var(--muted); }
.deadlines { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 18px 22px; margin: 22px 0 30px; }
.deadlines h2 { margin-top: 0; }
.deadline-table tr.past td { color: #9aa3b2; background: #f3f5f8; }
.deadline-table tr.past .tasktype { opacity: 0.55; }
.deadline-table tr.next-due td { background: #fff4d6; font-weight: 700; }
.deadline-table tr.next-due td.date-col::after { content: " ← next"; color: #8a1c14; font-weight: 700; }
.cal-links { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.btn-cal {
  display: inline-block;
  background: var(--navy);
  color: #fff !important;
  padding: 7px 14px;
  border-radius: 6px;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
}
.btn-cal:hover { background: var(--navy-dark); text-decoration: none; }
.cal-help { color: var(--muted); font-size: 0.9rem; }
@media (max-width: 700px) {
  .deadline-table { font-size: 0.88rem; }
  .deadline-table th:nth-child(2), .deadline-table td:nth-child(2) { display: none; }
  .deadline-table td.date-col { white-space: nowrap; }
}

/* Embedded Google Calendar: month grid on wide screens, agenda list on phones */
.course-calendar { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 18px 22px; margin: 0 0 30px; }
.course-calendar h2 { margin-top: 0; }
.cal-frame { width: 100%; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; background: #fff; }
.cal-frame iframe { display: block; width: 100%; border: 0; }
.cal-month iframe { height: 720px; }
.cal-agenda { display: none; }
.cal-agenda iframe { height: 600px; }
@media (max-width: 700px) {
  .cal-month { display: none; }
  .cal-agenda { display: block; }
  .course-calendar { padding: 14px; }
}

.cal-options { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 10px; }
.cal-option { border: 1px solid var(--border); border-radius: 8px; padding: 14px 18px; background: var(--sky-pale); }
.cal-option h4 { margin: 0 0 6px; color: var(--navy); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; }
.cal-option ul { padding-left: 20px; margin: 8px 0; font-size: 0.93rem; }
.cal-option li { margin-bottom: 4px; }
.rec { background: var(--navy); color: #fff; font-size: 0.72rem; padding: 2px 8px; border-radius: 999px; vertical-align: middle; margin-left: 6px; }
.ics-url code { display: block; font-size: 0.78rem; word-break: break-all; background: #fff; border: 1px solid var(--border); padding: 8px 10px; border-radius: 6px; user-select: all; }
@media (max-width: 800px) { .cal-options { grid-template-columns: 1fr; } }