/*
 * API Gateway Lab — kiểu trình bày chung.
 *
 * Dựng bằng HTML tĩnh nhiều trang chứ không phải SPA: mỗi bài là một địa chỉ
 * thật, lập chỉ mục được. Cùng khuôn với Nginx Lab, Caddy Lab, Redis Lab,
 * Docker Lab và Kafka Lab; chỉ đổi màu nhấn và mấy khối riêng của bài.
 */

:root {
  color-scheme: dark;
  --bg: #0b1020;
  --surface: #141a2e;
  --surface-2: #1c2338;
  --border: #293351;
  --ink: #e8ecf6;
  --muted: #98a4c0;
  --accent: #f4478f;
  --accent-soft: #ff9ac2;
  --warn: #f5b83d;
  --danger: #f06a6a;
  --ok: #3ecf8e;
  --envoy: #ac6199;
  --kong: #00b9a4;
  --nginx: #009639;
  --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Be Vietnam Pro", ui-sans-serif, system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
}

code, pre, .mono { font-family: "JetBrains Mono", ui-monospace, "SF Mono", monospace; }

a { color: var(--accent-soft); }

.wrap { max-width: 78rem; margin: 0 auto; padding: 0 1.25rem; }

/* ------------------------------ dau trang ------------------------------ */

.site-header {
  position: sticky; top: 0; z-index: 20;
  border-bottom: 1px solid var(--border);
  background: rgb(11 16 32 / 0.9);
  backdrop-filter: blur(8px);
}
.site-header .wrap { display: flex; align-items: center; gap: 1rem; height: 3.5rem; }
.brand {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-weight: 700; color: var(--ink); text-decoration: none; white-space: nowrap;
}
.brand .logo {
  width: 1.7rem; height: 1.7rem; display: grid; place-items: center;
  border-radius: 0.5rem; background: var(--accent); color: #fff0f6; font-size: 0.9rem;
}
.site-header nav { display: flex; gap: 0.9rem; margin-left: 0.5rem; flex-wrap: wrap; }
.site-header nav a { color: var(--muted); text-decoration: none; font-size: 0.9rem; }
.site-header nav a:hover, .site-header nav a[aria-current] { color: var(--ink); }

/* ------------------------------ bo cuc ------------------------------ */

.doc { display: grid; grid-template-columns: 17rem minmax(0, 1fr); gap: 2.5rem; padding: 2rem 1.25rem 4rem; }
@media (max-width: 62rem) { .doc { grid-template-columns: 1fr; gap: 1.5rem; } }

.site-toc { position: sticky; top: 4.5rem; align-self: start; max-height: calc(100vh - 6rem); overflow-y: auto; font-size: 0.9rem; }
@media (max-width: 62rem) { .site-toc { position: static; max-height: none; } }
.site-toc ul { list-style: none; margin: 0 0 1rem; padding: 0; }
.site-toc li { margin: 0.15rem 0; }
.site-toc a { display: block; padding: 0.3rem 0.6rem; border-radius: 0.4rem; color: var(--ink); opacity: 0.82; text-decoration: none; }
.site-toc a:hover { background: var(--surface-2); opacity: 1; }
.site-toc a[aria-current] { background: color-mix(in srgb, var(--accent) 26%, transparent); color: var(--accent-soft); font-weight: 600; opacity: 1; }
.toc-title, .toc-group { margin: 1.2rem 0 0.4rem; font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.toc-title:first-child { margin-top: 0; }
.toc-sections { margin: 0.2rem 0 0.5rem 0.8rem; border-left: 1px solid var(--border); }
.toc-sections a { font-size: 0.82rem; padding: 0.2rem 0.6rem; opacity: 0.7; }

/* ------------------------------ noi dung ------------------------------ */

.lesson h1, .home h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); line-height: 1.25; letter-spacing: -0.02em; margin: 0 0 0.8rem; }
.lesson h2 { font-size: 1.35rem; margin: 2.6rem 0 0.8rem; letter-spacing: -0.01em; }
.lesson h3 { font-size: 1.05rem; margin: 1.8rem 0 0.6rem; }
.lead { font-size: 1.05rem; color: rgb(232 236 246 / 0.86); margin: 0 0 1.5rem; }
.eyebrow { font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent-soft); margin: 0 0 0.4rem; }
.muted { color: var(--muted); }

pre {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 0.9rem 1rem; overflow-x: auto; font-size: 0.85rem; line-height: 1.6;
}
pre code { background: none; padding: 0; border: none; }
code { background: var(--surface-2); border: 1px solid var(--border); border-radius: 0.3rem; padding: 0.08rem 0.32rem; font-size: 0.86em; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); margin: 1.2rem 0; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 0.6rem 0.85rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--surface-2); font-size: 0.78rem; letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); }
tr:last-child td { border-bottom: none; }
td.num { text-align: right; font-family: "JetBrains Mono", ui-monospace, monospace; }
td.kq, td.mono { font-family: "JetBrains Mono", ui-monospace, monospace; }
td.kq .khac { color: var(--warn); }
td.kq .giong { color: var(--ok); }

.callout { border: 1px solid var(--border); border-left-width: 3px; border-radius: var(--radius); padding: 0.9rem 1.1rem; margin: 1.3rem 0; background: var(--surface); font-size: 0.95rem; }
.callout strong { display: block; margin-bottom: 0.3rem; }
.callout.note { border-left-color: var(--accent); }
.callout.tip { border-left-color: var(--ok); }
.callout.warn { border-left-color: var(--warn); }
.callout.danger { border-left-color: var(--danger); }

details { border: 1px solid var(--border); border-radius: var(--radius); padding: 0.7rem 1rem; margin: 0.6rem 0; background: var(--surface); }
summary { cursor: pointer; font-weight: 600; }
details[open] summary { margin-bottom: 0.5rem; }

/* ------------------------------ trang chu ------------------------------ */

.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr)); margin: 1.5rem 0; }
.card { display: block; border: 1px solid var(--border); border-radius: 1rem; background: var(--surface); padding: 1.1rem 1.2rem; text-decoration: none; color: inherit; transition: border-color 160ms, transform 160ms; }
a.card:hover { border-color: color-mix(in srgb, var(--accent) 70%, transparent); transform: translateY(-2px); }
.card .num { font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent-soft); }
.card h3 { margin: 0.35rem 0 0.4rem; font-size: 1.02rem; }
.card p { margin: 0; font-size: 0.88rem; color: var(--muted); line-height: 1.6; }

.actions { display: flex; flex-wrap: wrap; gap: 0.7rem; margin: 1.3rem 0; }
.button { display: inline-flex; align-items: center; height: 2.6rem; padding: 0 1.1rem; border-radius: 0.7rem; background: var(--accent); color: #fff0f6; font-weight: 600; text-decoration: none; }
.button.ghost { background: transparent; border: 1px solid var(--border); color: var(--ink); }

/* ------------------------------ phong thi nghiem ------------------------------ */

.lab-grid { display: grid; gap: 1.2rem; grid-template-columns: minmax(0, 24rem) minmax(0, 1fr); margin: 1.2rem 0; }
@media (max-width: 68rem) { .lab-grid { grid-template-columns: 1fr; } }

.panel { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); padding: 1rem 1.1rem; }
.panel h2 { margin: 0 0 0.7rem; font-size: 1rem; }
.panel + .panel { margin-top: 1rem; }

.field { margin-bottom: 0.9rem; }
.field label { display: block; font-size: 0.8rem; color: var(--muted); margin-bottom: 0.3rem; }
.field input[type="text"], .field input[type="number"], .field select, .field textarea {
  width: 100%; background: var(--bg); color: var(--ink);
  border: 1px solid var(--border); border-radius: 0.5rem; padding: 0.5rem 0.65rem;
  font-family: "JetBrains Mono", ui-monospace, monospace; font-size: 0.86rem;
}
.field textarea { resize: vertical; min-height: 7rem; line-height: 1.55; }
.field select { cursor: pointer; }
.field-row { display: grid; gap: 0.7rem; grid-template-columns: 1fr 1fr; }
@media (max-width: 30rem) { .field-row { grid-template-columns: 1fr; } }

.chips { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.5rem; }
.chip { background: var(--surface-2); border: 1px solid var(--border); border-radius: 999px; color: var(--ink); padding: 0.22rem 0.7rem; font-size: 0.78rem; cursor: pointer; font-family: inherit; }
.chip:hover { border-color: var(--accent); }

/* Ba cot ket qua, moi gateway mot mau. */
.ba-cot { display: grid; gap: 0.7rem; grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 52rem) { .ba-cot { grid-template-columns: 1fr; } }
.gw { border: 1px solid var(--border); border-top-width: 3px; border-radius: 0.6rem; background: var(--surface-2); padding: 0.6rem 0.7rem; }
.gw.envoy { border-top-color: var(--envoy); }
.gw.kong { border-top-color: var(--kong); }
.gw.nginx { border-top-color: var(--nginx); }
.gw .ten { font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.gw .thang { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: 1.05rem; margin: 0.15rem 0 0.35rem; }
.gw .thang.khong { color: var(--danger); }
.gw .vi-sao { font-size: 0.78rem; color: var(--muted); line-height: 1.55; }

/* Bang duong dan thu, mot hang mot duong dan. */
.thu { list-style: none; margin: 0.6rem 0 0; padding: 0; font-size: 0.82rem; }
.thu li { display: grid; grid-template-columns: minmax(0, 1fr) repeat(3, minmax(4.5rem, 6rem)); gap: 0.4rem; padding: 0.32rem 0.1rem; border-bottom: 1px dashed var(--border); align-items: baseline; }
.thu li:last-child { border-bottom: none; }
.thu .uri { font-family: "JetBrains Mono", ui-monospace, monospace; overflow-wrap: anywhere; }
.thu .o { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: 0.78rem; }
.thu .o.khac { color: var(--warn); font-weight: 600; }
.thu .o.khong { color: var(--danger); }
.thu .dau { color: var(--muted); font-size: 0.68rem; letter-spacing: 0.05em; text-transform: uppercase; border-bottom: 1px solid var(--border); }

/* Danh sach route dang gon. */
.route-ds { list-style: none; margin: 0.5rem 0 0; padding: 0; font-size: 0.8rem; }
.route-ds li { display: flex; gap: 0.5rem; align-items: baseline; padding: 0.25rem 0.1rem; border-bottom: 1px dashed var(--border); }
.route-ds li:last-child { border-bottom: none; }
.route-ds .stt { color: var(--muted); font-family: "JetBrains Mono", ui-monospace, monospace; font-size: 0.72rem; width: 1.6rem; flex: none; }
.route-ds .loai { font-size: 0.68rem; letter-spacing: 0.05em; text-transform: uppercase; color: var(--accent-soft); width: 4.2rem; flex: none; }
.route-ds .mau { font-family: "JetBrains Mono", ui-monospace, monospace; overflow-wrap: anywhere; }

.dem-o { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.6rem; margin-top: 0.8rem; }
.dem-o div { border: 1px solid var(--border); border-radius: 0.5rem; padding: 0.5rem 0.6rem; background: var(--surface-2); }
.dem-o .nhan { font-size: 0.68rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.dem-o .so { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: 1.02rem; }
.dem-o .so.doi { color: var(--warn); }

.result-box { border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--border)); background: color-mix(in srgb, var(--accent) 10%, var(--surface)); border-radius: var(--radius); padding: 0.9rem 1.1rem; margin-top: 0.8rem; }
.result-box .big { font-size: 1.05rem; color: var(--accent-soft); margin: 0; }
.result-box.err { border-color: color-mix(in srgb, var(--danger) 45%, var(--border)); background: color-mix(in srgb, var(--danger) 8%, var(--surface)); }
.result-box.err .big { color: var(--danger); }
.result-box.warn { border-color: color-mix(in srgb, var(--warn) 45%, var(--border)); background: color-mix(in srgb, var(--warn) 8%, var(--surface)); }
.result-box.warn .big { color: var(--warn); }

.site-footer { border-top: 1px solid var(--border); padding: 1.5rem 0 3rem; color: var(--muted); font-size: 0.85rem; }