/* ============================================================
   web.cs.hacettepe.edu.tr/~bgenc/ — site stylesheet
   Design language: dark folder-tree rail + light content pane.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,400;8..60,600;8..60,700&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --surface-0: #eef0f3;
  --surface-1: #ffffff;
  --surface-2: #e4e7ec;
  --line: #d3d8e0;
  --ink: #1c2027;
  --ink-soft: #565f6d;
  --accent: #b5822a;
  --accent-ink: #7a5717;
  --accent-soft: #f1e2c4;
  --good: #3f7a5c;
  --good-soft: #dcece3;
  --wait: #8a6a1f;
  --wait-soft: #f4ead0;
  --rail-bg: #171a20;
  --rail-line: #2a2f38;
  --rail-ink: #d9dce2;
  --rail-ink-dim: #7c8494;
  --rail-active: #262c37;
  --shadow: 0 1px 2px rgba(20, 22, 28, 0.06), 0 8px 24px -12px rgba(20, 22, 28, 0.18);
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface-0: #14161b;
    --surface-1: #1b1e25;
    --surface-2: #22262f;
    --line: #30353f;
    --ink: #e7e8ea;
    --ink-soft: #9aa0ab;
    --accent: #d4a344;
    --accent-ink: #f0d190;
    --accent-soft: #3a3020;
    --good: #6fbd93;
    --good-soft: #1e3329;
    --wait: #d9b25c;
    --wait-soft: #3a3220;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px -12px rgba(0, 0, 0, 0.5);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  background: var(--surface-0);
  color: var(--ink);
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
h1, h2, h3 { font-family: 'Source Serif 4', Georgia, serif; text-wrap: balance; margin: 0; }
code, .mono { font-family: 'IBM Plex Mono', ui-monospace, monospace; }
a { color: var(--accent-ink); }
img { max-width: 100%; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 14px 24px; flex-wrap: wrap;
  background: var(--rail-bg); color: var(--rail-ink);
  border-bottom: 1px solid var(--rail-line);
}
.topbar .brand { display: flex; align-items: baseline; gap: 10px; }
.topbar .brand a { color: var(--rail-ink); text-decoration: none; font-family: 'Source Serif 4', serif; font-weight: 600; font-size: 1.15rem; }
.topbar .brand .dept { color: var(--rail-ink-dim); font-size: 0.8rem; font-family: 'IBM Plex Mono', monospace; }
.topbar nav { display: flex; gap: 4px; }
.topbar nav a {
  color: var(--rail-ink-dim); text-decoration: none; font-family: 'IBM Plex Mono', monospace;
  font-size: 0.82rem; padding: 6px 12px; border-radius: 6px;
}
.topbar nav a:hover { color: var(--rail-ink); background: var(--rail-active); }
.topbar nav a.active { color: var(--rail-ink); background: var(--rail-active); box-shadow: 0 -2px 0 var(--accent) inset; }
#rail-toggle {
  display: none; background: none; border: 1px solid var(--rail-line); color: var(--rail-ink);
  border-radius: 6px; padding: 6px 10px; font-size: 1rem; cursor: pointer;
}

/* ---------- app shell ---------- */
.app-shell { flex: 1; display: grid; grid-template-columns: 270px 1fr; align-items: stretch; }
.rail {
  background: var(--rail-bg); color: var(--rail-ink); padding: 16px 8px;
  font-family: 'IBM Plex Mono', monospace; font-size: 0.83rem;
  border-right: 1px solid var(--rail-line); overflow-y: auto;
}
.rail .rail-label { font-size: 0.68rem; letter-spacing: 0.09em; text-transform: uppercase; color: var(--rail-ink-dim); padding: 4px 10px 8px; }
.rail-item {
  display: flex; align-items: center; gap: 7px; padding: 7px 10px; border-radius: 6px;
  cursor: pointer; color: var(--rail-ink); text-decoration: none;
}
.rail-item:hover { background: var(--rail-active); }
.rail-item.active { background: var(--rail-active); color: var(--rail-ink); }
.rail-item .chev { width: 10px; color: var(--rail-ink-dim); font-size: 0.7rem; display: inline-block; transition: transform .15s; }
.rail-item.open .chev { transform: rotate(90deg); }
.rail-children { margin-left: 18px; border-left: 1px solid var(--rail-line); padding-left: 6px; display: none; }
.rail-children.open { display: block; }
.rail-children .rail-item { font-size: 0.79rem; color: var(--rail-ink-dim); }
.rail-children .rail-item.active { color: var(--accent-ink); background: var(--rail-active); }
.rail-badge {
  margin-left: auto; font-size: 0.62rem; background: var(--good-soft); color: var(--good);
  padding: 1px 6px; border-radius: 999px; letter-spacing: 0.03em;
}

/* ---------- content pane ---------- */
.pane { padding: 32px clamp(20px, 4vw, 48px); max-width: 1100px; overflow-x: auto; }

/* ---------- home / about ---------- */
.hero { display: flex; gap: 26px; align-items: flex-start; flex-wrap: wrap; margin-bottom: 28px; }
.hero-photo {
  width: 108px; height: 108px; border-radius: 14px; flex-shrink: 0;
  background: linear-gradient(155deg, var(--accent-soft), var(--surface-2));
  display: flex; align-items: center; justify-content: center;
  font-family: 'Source Serif 4', serif; font-size: 2.2rem; color: var(--accent-ink);
  border: 1px solid var(--line);
}
img.hero-photo { object-fit: cover; background: var(--surface-2); }
.hero h1 { font-size: 1.9rem; }
.hero .role { color: var(--ink-soft); margin-top: 4px; }
.hero p.bio { max-width: 62ch; margin-top: 14px; line-height: 1.65; }
.chip-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.chip {
  font-size: 0.8rem; font-family: 'IBM Plex Mono', monospace; padding: 5px 12px;
  border-radius: 999px; background: var(--surface-2); color: var(--ink-soft); text-decoration: none;
  border: 1px solid var(--line);
}
.chip:hover { color: var(--accent-ink); border-color: var(--accent); }
.teaching-now { margin-top: 34px; }
.teaching-now h2 { font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); font-family: 'IBM Plex Sans'; font-weight: 600; margin-bottom: 12px; }
.now-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.now-card {
  background: var(--surface-1); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px;
  text-decoration: none; color: var(--ink); box-shadow: var(--shadow);
}
.now-card .code { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; color: var(--accent-ink); }
.now-card .t { font-weight: 600; margin-top: 3px; }
.now-card .meta { font-size: 0.78rem; color: var(--ink-soft); margin-top: 6px; }

/* ---------- course view ---------- */
.course-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; margin-bottom: 4px; }
.course-head h2 { font-size: 1.5rem; }
.course-meta { font-size: 0.8rem; color: var(--ink-soft); font-family: 'IBM Plex Mono', monospace; text-align: right; }
.course-note {
  font-size: 0.9rem; color: var(--ink-soft); background: var(--surface-1); border: 1px solid var(--line);
  border-radius: 8px; padding: 12px 16px; margin-top: 16px;
}
table.sched { width: 100%; border-collapse: collapse; font-size: 0.88rem; margin-top: 18px; }
table.sched th { text-align: left; font-weight: 600; font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-soft); border-bottom: 1px solid var(--line); padding: 8px 10px; }
table.sched td { padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.sched tbody tr:hover td { background: var(--surface-1); }
table.sched td a {
  display: inline-block; font-size: 0.76rem; font-family: 'IBM Plex Mono', monospace; padding: 2px 9px;
  border-radius: 5px; background: var(--accent-soft); color: var(--accent-ink); text-decoration: none; margin: 2px 4px 2px 0;
}
table.sched td a:hover { background: var(--accent); color: #1c1400; }
table.sched td .res-text {
  display: inline-block; font-size: 0.76rem; font-family: 'IBM Plex Mono', monospace; padding: 2px 9px;
  border-radius: 5px; background: var(--surface-2); color: var(--ink-soft); margin: 2px 4px 2px 0;
}

/* ---------- CV ---------- */
.cv-top { display: flex; gap: 22px; align-items: flex-start; margin-bottom: 26px; flex-wrap: wrap; }
.sync-badge { display: inline-flex; align-items: center; gap: 6px; font-size: 0.74rem; font-family: 'IBM Plex Mono', monospace; color: var(--good); background: var(--good-soft); padding: 3px 9px; border-radius: 999px; margin-top: 10px; }
.sync-badge.stale { color: var(--wait); background: var(--wait-soft); }
.sync-badge .dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.cv-section { margin-top: 28px; }
.cv-section h3 { font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); font-family: 'IBM Plex Sans'; font-weight: 600; margin-bottom: 12px; }
.pub { display: grid; grid-template-columns: 1fr auto; gap: 4px 14px; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 0.88rem; }
.pub:last-child { border-bottom: none; }
.pub .t { font-weight: 500; }
.pub .t a { color: inherit; }
.pub .meta { grid-column: 1; color: var(--ink-soft); font-size: 0.8rem; }
.pub .cite { font-family: 'IBM Plex Mono', monospace; font-size: 0.76rem; color: var(--ink-soft); white-space: nowrap; align-self: start; }
.stat-row { display: flex; gap: 26px; }
.stat b { font-family: 'IBM Plex Mono', monospace; font-size: 1.3rem; display: block; }
.stat span { font-size: 0.72rem; color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.06em; }
.timeline-item { display: flex; gap: 14px; padding: 8px 0; font-size: 0.88rem; }
.timeline-item .yr { font-family: 'IBM Plex Mono', monospace; color: var(--ink-soft); width: 110px; flex-shrink: 0; }

/* ---------- students / term board ---------- */
.students-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 14px; }
.students-tabs button {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.82rem; background: none; border: none;
  padding: 9px 14px; cursor: pointer; color: var(--ink-soft); border-bottom: 2px solid transparent;
}
.students-tabs button.active { color: var(--ink); border-bottom-color: var(--accent); font-weight: 600; }

.board-note { font-size: 0.82rem; color: var(--ink-soft); max-width: 900px; line-height: 1.5; margin-bottom: 12px; }
.board-legend { display: flex; gap: 20px; align-items: center; font-size: 0.76rem; color: var(--ink-soft); margin-bottom: 16px; flex-wrap: wrap; }
.board-legend .item { display: flex; align-items: center; gap: 6px; }
.board-legend .swatch { width: 14px; height: 14px; border-radius: 3px; box-sizing: border-box; display: inline-flex; flex-shrink: 0; }
.board-legend .split-swatch { border: 1px solid var(--ink-soft); }
.board-legend .split-swatch span { width: 50%; height: 100%; }
.board-legend .split-swatch span:first-child { border-right: 1px solid var(--ink-soft); }

.term-board-wrap { position: relative; width: 100%; overflow-x: auto; padding-bottom: 8px; }
.term-grid { position: relative; min-width: 560px; }
.term-row-line { position: absolute; left: 0; right: 0; border-top: 1px solid var(--line); box-sizing: border-box; }
.term-row-line.current { background: rgba(181, 130, 42, 0.08); }
.term-label { position: absolute; left: 0; box-sizing: border-box; padding-right: 10px; text-align: right;
  font-family: 'IBM Plex Mono', monospace; font-size: 0.68rem; color: var(--ink-soft); }
.term-label.current { color: var(--accent-ink); font-weight: 600; }

.student-groups { position: absolute; top: 0; display: flex; gap: 44px; }
.student-group { display: flex; flex-direction: column; }
.student-group-title { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-soft); height: 20px; }
.student-lanes { display: flex; gap: 18px; }
.lane-header { height: 34px; box-sizing: border-box; display: flex; flex-direction: column; justify-content: flex-end; padding-bottom: 4px; border-bottom: 1px solid var(--line); }
.lane-header .name { font-family: 'Source Serif 4', serif; font-weight: 600; font-size: 0.92rem; color: var(--ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lane-header .since { font-family: 'IBM Plex Mono', monospace; font-size: 0.68rem; color: var(--ink-soft); }
.lane-body { position: relative; }

.activity-box { position: absolute; box-sizing: border-box; padding: 6px 8px; border-radius: 5px; overflow: hidden; }
.activity-box.done { background: var(--good-soft); border: 1px solid var(--good); }
.activity-box.progress { background: var(--accent-soft); border: 2px dashed var(--accent); }
.activity-box .a-label { font-size: 0.78rem; font-weight: 600; line-height: 1.25; }
.activity-box.done .a-label, .activity-box.done .a-date, .activity-box.done a { color: var(--good); }
.activity-box.progress .a-label, .activity-box.progress .a-date, .activity-box.progress a { color: var(--accent-ink); }
.activity-box .a-date { font-family: 'IBM Plex Mono', monospace; font-size: 0.66rem; opacity: 0.85; margin-top: 1px; }
.activity-box .a-links { display: flex; flex-direction: column; gap: 1px; margin-top: 3px; }
.activity-box .a-links a { font-size: 0.66rem; font-family: 'IBM Plex Mono', monospace; text-decoration: underline; }

.grad-groups { display: flex; flex-direction: column; gap: 24px; }
.grad-group-title { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-soft); margin-bottom: 10px; }
.grad-card-grid { display: flex; flex-wrap: wrap; gap: 16px; }
.grad-card { width: 300px; box-sizing: border-box; background: var(--surface-1); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; box-shadow: var(--shadow); }
.grad-card .g-name { font-family: 'Source Serif 4', serif; font-weight: 600; font-size: 0.98rem; color: var(--ink); }
.grad-card .g-meta { font-family: 'IBM Plex Mono', monospace; font-size: 0.68rem; color: var(--ink-soft); margin-top: 2px; }
.grad-card .g-thesis { font-size: 0.82rem; color: var(--ink); font-style: italic; margin-top: 10px; line-height: 1.4; }
.grad-card .g-links { display: flex; flex-direction: column; gap: 3px; margin-top: 10px; }
.grad-card .g-links a { font-size: 0.72rem; font-family: 'IBM Plex Mono', monospace; color: var(--accent-ink); }

.empty-note { font-size: 0.85rem; color: var(--ink-soft); padding: 10px 2px; }

/* ---------- footer ---------- */
.footer { text-align: center; font-size: 0.8rem; color: var(--ink-soft); padding: 18px; border-top: 1px solid var(--line); }

/* ---------- responsive ---------- */
@media (max-width: 820px) {
  .app-shell { grid-template-columns: 1fr; }
  #rail-toggle { display: inline-block; }
  .rail { position: fixed; inset: 56px 0 0 0; z-index: 50; transform: translateX(-100%); transition: transform .18s ease; width: 82vw; max-width: 320px; }
  .rail.open { transform: translateX(0); box-shadow: var(--shadow); }
  .pane { padding: 22px 16px; }
}