@import url('https://fonts.googleapis.com/css2?family=Prompt:wght@300;400;500;600;700&family=Space+Grotesk:wght@500;600;700&display=swap');

:root {
  --bg: #fdfaf4;           /* warm parchment */
  --ink: #0f1b2d;           /* deep navy ink (text) */
  --surface: #faf6ee;
  --card: #ffffff;
  --navy: #13284b;          /* deep academic navy (primary) */
  --navy-ink: #ffffff;
  --secondary: #f1eadc;
  --muted: #f0ebe0;
  --muted-fg: #596475;
  --accent-surface: #fae5c3;
  --gold: #d79628;          /* warm brass gold */
  --gold-ink: #0b1628;
  --pink: #d1528b;          /* Chulalongkorn signature pink */
  --pink-soft: #ffe2ec;
  --pink-dark: #ad3d6d;
  --danger: #d40c1a;
  --border: #ddd7c9;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Prompt", "Noto Sans Thai", ui-sans-serif, system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 {
  font-family: "Space Grotesk", "Prompt", sans-serif;
  letter-spacing: -0.01em;
  color: var(--ink);
}
a { color: var(--pink-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ---------- Header ---------- */
header.site {
  position: sticky; top: 0; z-index: 40;
  background: rgba(253, 250, 244, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
header.site .bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px; max-width: 1200px; margin: 0 auto; flex-wrap: wrap; gap: 14px; height: 64px;
}
header.site .brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
header.site .brand:hover { text-decoration: none; }
header.site .brand .badge-icon {
  display: grid; place-items: center; width: 36px; height: 36px; border-radius: 8px;
  background: var(--navy); color: #fff; font-size: 18px; flex-shrink: 0;
}
header.site .brand .brand-text { line-height: 1.15; }
header.site .brand .brand-text .t1 { font-family: "Space Grotesk", sans-serif; font-size: .92rem; font-weight: 600; }
header.site .brand .brand-text .t2 { font-size: .62rem; letter-spacing: .16em; text-transform: uppercase; color: var(--muted-fg); }
header.site nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
header.site nav a {
  position: relative; color: rgba(15,27,45,.72); text-decoration: none;
  padding: 8px 12px; border-radius: 6px; font-size: .9rem; font-weight: 500;
}
header.site nav a:hover { color: var(--ink); text-decoration: none; }
header.site nav a.active { color: var(--ink); }
header.site nav a.active::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: -1px; height: 2px;
  background: var(--pink); border-radius: 2px;
}
.lang-toggle { display: inline-flex; overflow: hidden; border-radius: 6px; border: 1px solid var(--border); font-size: .78rem; font-weight: 500; }
.lang-toggle a { padding: 6px 10px; color: rgba(15,27,45,.65); }
.lang-toggle a.active { background: var(--navy); color: #fff; }
.lang-toggle a:hover { text-decoration: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 10px 20px; border-radius: 8px;
  font-weight: 600; text-decoration: none; border: 1px solid transparent; cursor: pointer;
  font-size: 0.92rem; font-family: inherit; transition: opacity .15s ease, background-color .15s ease;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--pink); color: #fff; }
.btn-primary:hover { background: var(--pink-dark); }
.btn-outline { border-color: rgba(255,255,255,.4); color: #fff; background: transparent; }
.btn-outline:hover { background: rgba(255,255,255,.1); }
.btn-secondary { background: var(--navy); color: #fff; }
.btn-secondary:hover { opacity: .92; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 6px 13px; font-size: .82rem; }

main { padding: 0 0 60px; }
.section { padding: 56px 0; }
.section-title { margin-bottom: 26px; }
.eyebrow { font-family: "Space Grotesk", sans-serif; text-transform: uppercase; letter-spacing: .16em; font-size: .74rem; color: var(--pink); font-weight: 600; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background: var(--navy); border-bottom: 1px solid var(--border);
}
.hero .hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .25; }
.hero .hero-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, var(--navy) 10%, rgba(19,40,75,.92) 55%, rgba(209,82,139,.45)); }
.hero .hero-inner { position: relative; padding: 72px 0; display: grid; gap: 32px; grid-template-columns: 1.2fr 1fr; align-items: end; }
@media (max-width: 860px) { .hero .hero-inner { grid-template-columns: 1fr; padding: 52px 0; } }
.hero h1 { font-size: 2.6rem; line-height: 1.1; margin: 14px 0 10px; color: #fff; }
@media (max-width: 640px) { .hero h1 { font-size: 1.9rem; } }
.hero p.sub { max-width: 560px; color: rgba(255,255,255,.82); font-size: 1.02rem; }
.hero .cta { margin-top: 26px; display: flex; gap: 12px; flex-wrap: wrap; }
.hero .overview-card { border: 1px solid rgba(209,82,139,.4); background: rgba(255,255,255,.05); backdrop-filter: blur(6px); border-radius: 14px; padding: 20px; }
.hero .overview-row { display: flex; align-items: center; justify-content: space-between; border: 1px solid rgba(255,255,255,.1); background: rgba(255,255,255,.05); border-radius: 10px; padding: 12px 16px; margin-top: 14px; }
.hero .overview-row .left { display: flex; align-items: center; gap: 12px; font-size: .9rem; font-weight: 500; }
.hero .overview-row .icon { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 8px; background: var(--pink); color: #fff; }
.hero .overview-row .count { font-family: "Space Grotesk", sans-serif; font-size: 1.5rem; font-weight: 700; color: var(--pink); }

/* ---------- Grid / cards ---------- */
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 880px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.step-card { transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease; }
.step-card:hover { transform: translateY(-2px); border-color: var(--pink); box-shadow: 0 8px 20px rgba(0,0,0,.06); }
.step-card .top-row { display: flex; align-items: center; justify-content: space-between; }
.step-card .icon-badge { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 8px; background: var(--navy); color: #fff; }
.step-card .num { font-family: "Space Grotesk", sans-serif; font-size: .85rem; font-weight: 700; letter-spacing: .1em; color: var(--muted-fg); }
.step-card h3 { margin: 14px 0 4px; font-size: 1.08rem; }
.step-card p { margin: 0; color: var(--muted-fg); font-size: .9rem; }

.feature-card { position: relative; overflow: hidden; border-radius: 12px; border: 1px solid var(--border); display: block; height: 260px; }
.feature-card img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .5s ease; }
.feature-card:hover img { transform: scale(1.04); }
.feature-card .overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(19,40,75,.92), rgba(19,40,75,.2) 55%, transparent); }
.feature-card .text { position: absolute; left: 0; right: 0; bottom: 0; padding: 20px; color: #fff; }
.feature-card .text .eyebrow { color: var(--pink); }
.feature-card .text h3 { color: #fff; margin: 4px 0 0; font-size: 1.2rem; }

.badge { display: inline-block; font-size: .7rem; font-weight: 700; padding: 3px 10px; border-radius: 999px; background: var(--pink-soft); color: var(--pink-dark); }
.badge.pc { background: #e4ecf7; color: #1e3a6e; }
.muted { color: var(--muted-fg); font-size: .9rem; }

/* ---------- Rooms (floor-grouped) ---------- */
.floor-header {
  position: sticky; top: 64px; z-index: 10; margin: 0 -20px 22px; padding: 14px 20px;
  background: rgba(253,250,244,.92); backdrop-filter: blur(6px); border-bottom: 1px solid var(--border);
  display: flex; align-items: flex-end; justify-content: space-between; gap: 16px;
}
.floor-header .floor-num { font-family: "Space Grotesk", sans-serif; font-size: 2.4rem; font-weight: 700; line-height: 1; }
.floor-header .floor-label { font-size: .8rem; letter-spacing: .14em; text-transform: uppercase; color: var(--muted-fg); margin-left: 10px; }
.floor-header .rule { height: 2px; width: 60px; background: var(--pink); margin-top: 8px; }
.floor-header .count { font-size: .78rem; color: var(--muted-fg); white-space: nowrap; }

.room-row {
  border: 1px solid var(--border); border-radius: 12px; padding: 18px 20px; background: var(--card);
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 14px;
}
.room-row .info { flex: 1; min-width: 240px; }
.room-row .code-row { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; }
.room-row .code-row .code { font-family: "Space Grotesk", sans-serif; font-weight: 700; color: var(--pink-dark); }
.room-row .meta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 8px; font-size: .82rem; color: var(--muted-fg); }
.room-row .meta span { display: inline-flex; align-items: center; gap: 5px; }

.filter-tabs { display: inline-flex; border: 1px solid var(--border); background: var(--card); border-radius: 8px; padding: 4px; font-size: .86rem; font-weight: 500; }
.filter-tabs a { padding: 7px 14px; border-radius: 6px; color: rgba(15,27,45,.7); }
.filter-tabs a:hover { text-decoration: none; }
.filter-tabs a.active { background: var(--pink); color: #fff; }

/* ---------- Forms ---------- */
form .field { margin-bottom: 16px; }
form label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .9rem; }
.req { color: var(--danger); }
input, select, textarea {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px;
  font-size: .93rem; font-family: inherit; background: #fff; color: var(--ink);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--pink); outline-offset: 1px; border-color: var(--pink); }
textarea { resize: vertical; }
.hint { font-size: .8rem; color: var(--muted-fg); margin-top: 4px; }
.checkline { display: flex; align-items: flex-start; gap: 10px; font-weight: 400; font-size: .9rem; margin-bottom: 8px; }
.checkline input { width: auto; margin-top: 3px; }

.alert { padding: 12px 14px; border-radius: 8px; margin-bottom: 16px; font-size: .92rem; }
.alert-error { background: #fdeceb; color: #a3271f; border: 1px solid #f3c8c3; }
.alert-success { background: #eaf6ec; color: #276b3a; border: 1px solid #bfe3c5; }
.alert-info { background: var(--accent-surface); color: #6b4a10; border: 1px solid #edcf94; }

table { width: 100%; border-collapse: collapse; font-size: .9rem; }
table th, table td { padding: 9px 10px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
table th { color: var(--muted-fg); font-weight: 600; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; }

.status-pill { display: inline-block; padding: 5px 12px; border-radius: 999px; font-size: .8rem; font-weight: 700; }
.status-pending_advisor, .status-pending_staff, .status-pending_admin { background: var(--accent-surface); color: #6b4a10; }
.status-confirmed { background: #eaf6ec; color: #276b3a; }
.status-rejected { background: #fdeceb; color: #a3271f; }
.status-cancelled { background: #ecebe6; color: #5b5a55; }

/* ---------- Rules list ---------- */
.rules-list { list-style: none; padding: 0; display: grid; gap: 14px; grid-template-columns: repeat(2, 1fr); }
@media (max-width: 700px) { .rules-list { grid-template-columns: 1fr; } }
.rules-list li { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 16px 18px; display: flex; gap: 14px; }
.rules-list .icon-badge { flex-shrink: 0; display: grid; place-items: center; width: 38px; height: 38px; border-radius: 8px; background: var(--pink-soft); color: var(--pink-dark); }
.rules-list .num { color: var(--pink); font-weight: 700; font-size: .78rem; margin-right: 6px; font-family: "Space Grotesk", sans-serif; }

/* ---------- Footer ---------- */
footer.site { margin-top: 40px; border-top: 2px solid var(--pink); background: var(--surface); }
footer.site .foot-grid { display: grid; gap: 32px; grid-template-columns: repeat(3, 1fr); padding: 40px 0; }
@media (max-width: 700px) { footer.site .foot-grid { grid-template-columns: 1fr; } }
footer.site .col-title { font-family: "Space Grotesk", sans-serif; font-size: .72rem; text-transform: uppercase; letter-spacing: .16em; color: var(--muted-fg); margin: 0 0 8px; }
footer.site .foot-grid p, footer.site .foot-grid li { font-size: .9rem; margin: 4px 0; }
footer.site ul { list-style: none; padding: 0; margin: 0; }
footer.site a { color: var(--ink); }
footer.site a:hover { color: var(--pink-dark); }
footer.site .right { text-align: right; }
@media (max-width: 700px) { footer.site .right { text-align: left; } }

/* ---------- Admin ---------- */
.admin-shell { display: grid; grid-template-columns: 220px 1fr; min-height: calc(100vh - 64px); }
.admin-nav { background: #fff; border-right: 1px solid var(--border); padding: 18px 0; }
.admin-nav a { display: block; padding: 9px 20px; color: var(--ink); text-decoration: none; font-size: .92rem; }
.admin-nav a:hover, .admin-nav a.active { background: var(--pink-soft); color: var(--pink-dark); font-weight: 600; text-decoration: none; }
.admin-content { padding: 24px 28px; }
@media (max-width: 800px) { .admin-shell { grid-template-columns: 1fr; } .admin-nav { display: flex; overflow-x: auto; border-right: none; border-bottom: 1px solid var(--border); } .admin-nav a { white-space: nowrap; } }

.login-box { max-width: 380px; margin: 60px auto; background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 28px; }

.steps { display: grid; gap: 20px; grid-template-columns: repeat(3, 1fr); }
@media (max-width: 700px) { .steps { grid-template-columns: 1fr; } }

/* ---------- Weekly availability calendar ---------- */
.cal-grid { display: grid; user-select: none; -webkit-user-select: none; touch-action: none; min-width: 560px; }
.cal-scroll { overflow-x: auto; }
.cal-daylabel { text-align: center; font-size: .74rem; font-weight: 600; padding-bottom: 6px; }
.cal-daylabel.today { color: var(--pink); }
.cal-daylabel .dow { display: block; }
.cal-daylabel .dnum { color: var(--muted-fg); font-weight: 500; }
.cal-daylabel.closed { opacity: .55; }
.cal-timelabel { font-size: .68rem; color: var(--muted-fg); text-align: right; padding-right: 6px; line-height: 26px; }
.cal-slot { margin: 1px; height: 24px; border-radius: 3px; border: 1px solid var(--border); cursor: pointer; padding: 0; }
.cal-slot.free { background: #f4f2ec; }
.cal-slot.free:hover { background: var(--pink-soft); }
.cal-slot.pending { background: #eec96b; border-color: #d9ad3f; cursor: not-allowed; }
.cal-slot.booked { background: var(--danger); border-color: #a30d18; cursor: not-allowed; }
.cal-slot.closed, .cal-slot.cutoff { background: #ece8df; cursor: not-allowed; opacity: .55; }
.cal-slot.selected { background: var(--pink); border-color: var(--pink-dark); }
.cal-legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: .78rem; color: var(--muted-fg); margin: 10px 0 6px; }
.cal-legend .dot { display: inline-block; width: 11px; height: 11px; border-radius: 3px; vertical-align: middle; margin-right: 4px; border: 1px solid rgba(0,0,0,.08); }