/* ============================================================================
   Hệ thống Thi đua - Trường PTDT Nội trú tỉnh Sơn La
   Bảng thi đua điện tử: nền giấy ấm, mực xanh bảng, số liệu dạng bảng biểu.
   ========================================================================== */

/* ------------------------------- Token màu ------------------------------- */
:root {
  /* Bảng màu gốc cho các thành phần gốc của trình duyệt (nút, ô nhập, thanh cuộn).
     Phải khai báo lại theo từng chế độ, nếu không trình duyệt sẽ dùng chữ trắng
     cho nút khi hệ điều hành đang ở chế độ tối. */
  color-scheme: light;

  /* Bề mặt */
  --paper:        #f4f2ec;
  --paper-2:      #eae7de;
  --surface:      #ffffff;
  --surface-2:    #fbfaf7;
  --surface-sunk: #f1efe8;

  /* Mực */
  --ink:          #141d19;
  --ink-2:        #3c4a44;
  --ink-3:        #6b7a73;
  --ink-4:        #9aa6a0;

  /* Đường kẻ */
  --line:         #dcd8cc;
  --line-2:       #e8e5db;
  --line-strong:  #c6c1b2;

  /* Bảng xanh - màu chủ đạo */
  --brand:        #0d5c4d;
  --brand-2:      #0f7261;
  --brand-3:      #12836f;
  --brand-soft:   #e3efe9;
  --brand-ink:    #06342b;

  /* Điểm */
  --plus:         #0d7a52;
  --plus-soft:    #e2f2ea;
  --minus:        #bf3a2b;
  --minus-soft:   #fbe9e6;
  --restore:      #2b62a8;
  --restore-soft: #e6eefa;

  /* Thứ hạng */
  --gold:         #b58a1f;
  --gold-soft:    #fbf1d6;
  --silver:       #7d878c;
  --silver-soft:  #eef0f1;
  --bronze:       #9a6134;
  --bronze-soft:  #f6e9dd;

  --warn:         #a86413;
  --warn-soft:    #fbf0dd;

  /* Bảng xanh dẫn đầu - luôn là nền đậm chữ sáng ở cả hai chế độ */
  --board-a:      #06342b;
  --board-b:      #0e6d5c;
  --board-glow:   #12836f;
  --board-text:   #f0f8f5;
  --board-muted:  #9ecdc0;
  --board-line:   rgba(255, 255, 255, .15);
  --board-fill:   rgba(255, 255, 255, .08);
  --board-fill-2: rgba(255, 255, 255, .13);

  /* Hình khối */
  --r-xs: 6px;
  --r-sm: 9px;
  --r-md: 13px;
  --r-lg: 18px;
  --r-full: 999px;

  --shadow-1: 0 1px 2px rgba(20, 29, 25, .05), 0 1px 1px rgba(20, 29, 25, .03);
  --shadow-2: 0 2px 4px rgba(20, 29, 25, .05), 0 6px 16px -6px rgba(20, 29, 25, .10);
  --shadow-3: 0 12px 32px -12px rgba(20, 29, 25, .22), 0 2px 6px rgba(20, 29, 25, .06);

  --maxw: 1240px;
  --pad: clamp(16px, 3vw, 32px);

  --font: "Be Vietnam Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
          "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace;
}

[data-theme="dark"] {
  color-scheme: dark;

  --paper:        #0d1412;
  --paper-2:      #101917;
  --surface:      #151f1c;
  --surface-2:    #18231f;
  --surface-sunk: #111a17;

  --ink:          #eef2ef;
  --ink-2:        #c3ccc7;
  --ink-3:        #8f9c96;
  --ink-4:        #6b7873;

  --line:         #26332e;
  --line-2:       #1e2a26;
  --line-strong:  #35443e;

  --brand:        #2f9d84;
  --brand-2:      #3aae93;
  --brand-3:      #46bfa1;
  --brand-soft:   #16302b;
  --brand-ink:    #d5f0e8;

  --plus:         #35b381;
  --plus-soft:    #14312a;
  --minus:        #e2705f;
  --minus-soft:   #331c19;
  --restore:      #6d9fe0;
  --restore-soft: #17273b;

  --gold:         #d9ab3f;
  --gold-soft:    #322915;
  --silver:       #a9b4b8;
  --silver-soft:  #232b2d;
  --bronze:       #c58a55;
  --bronze-soft:  #302318;

  --warn:         #d9a24a;
  --warn-soft:    #302516;

  /* Bảng xanh giữ nguyên tông đậm để chữ sáng luôn đủ tương phản */
  --board-a:      #04231d;
  --board-b:      #0b5548;
  --board-glow:   #0d6b5a;
  --board-text:   #eef7f3;
  --board-muted:  #93c4b6;
  --board-line:   rgba(255, 255, 255, .13);
  --board-fill:   rgba(255, 255, 255, .06);
  --board-fill-2: rgba(255, 255, 255, .11);

  --shadow-1: 0 1px 2px rgba(0, 0, 0, .35);
  --shadow-2: 0 2px 6px rgba(0, 0, 0, .35), 0 8px 20px -8px rgba(0, 0, 0, .5);
  --shadow-3: 0 16px 40px -16px rgba(0, 0, 0, .7);
}

/* ------------------------------ Logo nhà trường -------------------------- */
/* Ảnh gốc là hình vuông có nền trắng ở bốn góc. Tệp dùng trong giao diện đã được
   cắt tròn sẵn (góc trong suốt), phần CSS dưới đây bo tròn thêm một lần nữa để logo
   luôn là hình tròn kể cả khi thay bằng ảnh vuông chưa xử lý. */
.logo-mark {
  --logo-size: 38px;
  display: inline-grid;
  place-items: center;
  flex: none;
  width: var(--logo-size);
  height: var(--logo-size);
  border-radius: 50%;
  background: #fff;
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--line), var(--shadow-1);
}

.logo-mark img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.logo-mark--brand { --logo-size: 38px; }
.logo-mark--board { --logo-size: 46px; box-shadow: 0 0 0 2px rgba(255, 255, 255, .22); }
.logo-mark--auth  { --logo-size: 76px; box-shadow: 0 0 0 1px var(--line), var(--shadow-2); }
.logo-mark--sheet { --logo-size: 62px; box-shadow: 0 0 0 1px var(--line); }

/* -------------------------------- Nền tảng -------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  background-image:
    radial-gradient(circle at 12% -10%, color-mix(in srgb, var(--brand) 9%, transparent), transparent 45%),
    radial-gradient(circle at 92% 0%, color-mix(in srgb, var(--gold) 7%, transparent), transparent 40%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { margin: 0; line-height: 1.25; letter-spacing: -.015em; font-weight: 650; }
h1 { font-size: clamp(1.5rem, 3.4vw, 2.1rem); }
h2 { font-size: clamp(1.15rem, 2.2vw, 1.45rem); }
h3 { font-size: 1.05rem; }
p { margin: 0 0 .75em; }
a { color: var(--brand-2); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; }

/* Nút không có lớp .btn vẫn phải theo màu chữ của giao diện, không lấy mặc định
   của trình duyệt (vốn là chữ trắng khi hệ điều hành ở chế độ tối). */
button {
  color: inherit;
  font: inherit;
}

:focus-visible {
  outline: 2.5px solid var(--brand-3);
  outline-offset: 2px;
  border-radius: var(--r-xs);
}

.num { font-family: var(--mono); font-variant-numeric: tabular-nums; font-feature-settings: "tnum"; }
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--brand); color: #fff; padding: 10px 16px; border-radius: 0 0 var(--r-sm) 0;
}
.skip:focus { left: 0; }
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding-inline: var(--pad); }
.sr {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* --------------------------------- Thanh trên ----------------------------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.topbar__inner {
  display: flex; align-items: center; gap: 18px;
  width: 100%; max-width: var(--maxw); margin: 0 auto;
  padding: 10px var(--pad); min-height: 62px;
}
.brand { display: flex; align-items: center; gap: 11px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__text strong { font-size: .96rem; letter-spacing: -.01em; }
.brand__text small { font-size: .715rem; color: var(--ink-3); }

.nav { display: flex; gap: 2px; margin-inline-start: auto; flex-wrap: wrap; }
.nav a {
  padding: 7px 12px; border-radius: var(--r-full); font-size: .855rem; font-weight: 500;
  color: var(--ink-2); text-decoration: none; transition: background .15s, color .15s;
}
.nav a:hover { background: var(--surface-2); color: var(--ink); text-decoration: none; }
.nav a.is-active { background: var(--brand-soft); color: var(--brand); font-weight: 600; }

.topbar__actions { display: flex; align-items: center; gap: 8px; }

.icon-btn {
  display: inline-grid; place-items: center; width: 36px; height: 36px; flex: none;
  border: 1px solid var(--line); border-radius: var(--r-sm);
  background: var(--surface); color: var(--ink-2); cursor: pointer;
  transition: .15s; padding: 0;
}
.icon-btn:hover { border-color: var(--line-strong); color: var(--ink); background: var(--surface-2); }
.icon-btn svg { width: 17px; height: 17px; }
.nav-toggle { display: none; }

/* --------------------------------- Nút ----------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 9px 15px; border-radius: var(--r-sm); border: 1px solid var(--line);
  background: var(--surface); color: var(--ink); font: inherit; font-size: .875rem;
  font-weight: 550; cursor: pointer; text-decoration: none; white-space: nowrap;
  transition: .15s;
}
.btn:hover { border-color: var(--line-strong); background: var(--surface-2); text-decoration: none; }
.btn svg { width: 16px; height: 16px; flex: none; }
.btn--primary {
  background: var(--brand); border-color: var(--brand); color: #fff;
  box-shadow: 0 1px 2px rgba(13, 92, 77, .3);
}
.btn--primary:hover { background: var(--brand-2); border-color: var(--brand-2); color: #fff; }
.btn--ghost { background: transparent; border-color: transparent; color: var(--ink-2); }
.btn--ghost:hover { background: var(--surface-2); }
.btn--danger { color: var(--minus); border-color: color-mix(in srgb, var(--minus) 35%, var(--line)); }
.btn--danger:hover { background: var(--minus-soft); border-color: var(--minus); }
.btn--sm { padding: 6px 11px; font-size: .8rem; }
.btn--xs { padding: 4px 8px; font-size: .74rem; border-radius: var(--r-xs); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* -------------------------------- Thẻ ----------------------------------- */
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-lg); box-shadow: var(--shadow-1); overflow: hidden;
}
.card__head {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  padding: 16px 20px; border-bottom: 1px solid var(--line-2);
}
.card__head h2, .card__head h3 { margin: 0; }
.card__head p { margin: 2px 0 0; font-size: .82rem; color: var(--ink-3); }
.card__head .spacer { margin-inline-start: auto; }
.card__body { padding: 20px; }
.card__body--flush { padding: 0; }

/* ------------------------------ Khối trang ------------------------------- */
.page { padding-block: 26px 64px; display: grid; gap: 22px; }
.page__head { display: grid; gap: 10px; }
.page__head .eyebrow {
  font-size: .72rem; font-weight: 650; letter-spacing: .13em; text-transform: uppercase;
  color: var(--brand); display: flex; align-items: center; gap: 8px;
}
.page__head .eyebrow::before {
  content: ""; width: 22px; height: 2px; background: var(--brand); border-radius: 2px;
}
.lede { color: var(--ink-2); max-width: 68ch; font-size: .95rem; margin: 0; }

.grid { display: grid; gap: 16px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
@media (max-width: 900px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 620px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* ------------------------------ Số liệu lớn ------------------------------ */
.stat {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  padding: 15px 17px; display: grid; gap: 4px; box-shadow: var(--shadow-1);
}
.stat__label {
  font-size: .72rem; font-weight: 600; letter-spacing: .07em; text-transform: uppercase;
  color: var(--ink-3);
}
.stat__value { font-family: var(--mono); font-size: 1.5rem; font-weight: 600; letter-spacing: -.02em; }
.stat__note { font-size: .78rem; color: var(--ink-3); }
.stat--plus .stat__value { color: var(--plus); }
.stat--minus .stat__value { color: var(--minus); }
.stat--restore .stat__value { color: var(--restore); }
.stat--brand .stat__value { color: var(--brand); }

/* ------------------------------- Nhãn ----------------------------------- */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 2px 9px; border-radius: var(--r-full);
  font-size: .715rem; font-weight: 600; letter-spacing: .01em;
  background: var(--surface-sunk); color: var(--ink-2);
  border: 1px solid transparent; white-space: nowrap;
}
.badge svg { width: 12px; height: 12px; }
.badge--plus    { background: var(--plus-soft);    color: var(--plus); }
.badge--minus   { background: var(--minus-soft);   color: var(--minus); }
.badge--restore { background: var(--restore-soft); color: var(--restore); }
.badge--brand   { background: var(--brand-soft);   color: var(--brand); }
.badge--gold    { background: var(--gold-soft);    color: var(--gold); }
.badge--warn    { background: var(--warn-soft);    color: var(--warn); }
.badge--outline { background: transparent; border-color: var(--line); color: var(--ink-3); }

/* --------------------------- Bảng xanh dẫn đầu --------------------------- */
.board {
  position: relative; overflow: hidden;
  border-radius: var(--r-lg); border: 1px solid var(--board-a);
  background:
    radial-gradient(circle at 85% -30%, color-mix(in srgb, var(--board-glow) 55%, transparent), transparent 55%),
    linear-gradient(160deg, var(--board-a), var(--board-b));
  color: var(--board-text);
  box-shadow: var(--shadow-3);
}
.board__inner { padding: clamp(18px, 3vw, 30px); display: grid; gap: 22px; }
.board__top { display: flex; align-items: flex-start; gap: 18px; flex-wrap: wrap; }
.board__title { display: grid; gap: 5px; }
.board__title h1 { color: #fff; font-size: clamp(1.35rem, 3vw, 1.85rem); }
.board__title p { margin: 0; color: var(--board-muted); font-size: .85rem; }
.board__week {
  margin-inline-start: auto; text-align: right; display: grid; gap: 3px;
  padding: 9px 15px; border-radius: var(--r-md);
  background: var(--board-fill); border: 1px solid var(--board-line);
}
.board__week strong { font-family: var(--mono); font-size: 1.1rem; color: #fff; }
.board__week span { font-size: .74rem; color: var(--board-muted); }

.board__stats { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
.board__stat { display: grid; gap: 2px; }
.board__stat b {
  font-family: var(--mono); font-size: 1.35rem; font-weight: 600; color: #fff; letter-spacing: -.02em;
}
.board__stat span { font-size: .72rem; letter-spacing: .07em; text-transform: uppercase; color: var(--board-muted); }

/* Khu vực dẫn đầu khi các lớp đồng hạng (thay cho bục vinh danh) */
.leaders { display: grid; gap: 12px; }
.leaders__caption { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.leaders__note { font-size: .8rem; color: var(--board-muted); }
.leaders__row { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.leader-card {
  display: grid; gap: 5px; padding: 14px 16px; text-decoration: none; color: inherit;
  background: var(--board-fill); border: 1px solid var(--board-line); border-radius: var(--r-md);
  transition: transform .18s, background .18s;
}
.leader-card:hover { transform: translateY(-3px); background: var(--board-fill-2); text-decoration: none; }
.leader-card__rank { font-size: .7rem; letter-spacing: .09em; text-transform: uppercase; color: var(--board-muted); }
.leader-card__code { font-size: 1.15rem; font-weight: 700; color: #fff; letter-spacing: -.01em; }
.leader-card__score { font-family: var(--mono); font-size: 1.5rem; font-weight: 600; color: #fff; letter-spacing: -.03em; }
.leader-card__meta { font-size: .72rem; color: var(--board-muted); }

/* Bục vinh danh */
.podium { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; align-items: end; }
.podium__item {
  display: grid; gap: 8px; justify-items: center; text-align: center;
  background: var(--board-fill); border: 1px solid var(--board-line);
  border-radius: var(--r-md); padding: 14px 10px; text-decoration: none; color: inherit;
  transition: transform .18s, background .18s;
}
.podium__item:hover { transform: translateY(-3px); background: var(--board-fill-2); text-decoration: none; }
.podium__item--1 { grid-column: 2; grid-row: 1; padding-block: 22px 16px; }
.podium__item--2 { grid-column: 1; grid-row: 1; }
.podium__item--3 { grid-column: 3; grid-row: 1; }
.podium__medal {
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  font-family: var(--mono); font-weight: 700; font-size: .95rem; color: #2a2110;
}
.podium__item--1 .podium__medal { background: linear-gradient(150deg, #f6dc8f, #cfa233); }
.podium__item--2 .podium__medal { background: linear-gradient(150deg, #eef1f3, #b9c2c6); }
.podium__item--3 .podium__medal { background: linear-gradient(150deg, #eabf95, #b3794a); }
.podium__code { font-size: 1.1rem; font-weight: 700; color: #fff; letter-spacing: -.01em; }
.podium__score { font-family: var(--mono); font-size: 1.6rem; font-weight: 600; color: #fff; letter-spacing: -.03em; }
.podium__meta { font-size: .72rem; color: var(--board-muted); }
@media (max-width: 620px) {
  .podium { grid-template-columns: 1fr; }
  .podium__item--1, .podium__item--2, .podium__item--3 { grid-column: 1; grid-row: auto; }
  .podium__item--1 { order: -1; }
}

/* ------------------------------- Bảng xếp hạng --------------------------- */
.rank-table { width: 100%; border-collapse: collapse; font-size: .885rem; }
.rank-table th {
  text-align: left; font-size: .71rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--ink-3); font-weight: 650; padding: 11px 12px; white-space: nowrap;
  border-bottom: 1px solid var(--line); background: var(--surface-2);
  position: sticky; top: 0; z-index: 2;
}
.rank-table td { padding: 10px 12px; border-bottom: 1px solid var(--line-2); vertical-align: middle; }
.rank-table tbody tr { transition: background .12s; }
.rank-table tbody tr:hover { background: var(--surface-2); }
.rank-table tbody tr.is-top { background: color-mix(in srgb, var(--gold) 5%, transparent); }
.rank-table .t-right { text-align: right; }
.rank-table .t-center { text-align: center; }

.rank-no {
  display: inline-grid; place-items: center; min-width: 30px; height: 30px; padding-inline: 6px;
  border-radius: var(--r-sm); font-family: var(--mono); font-weight: 650; font-size: .82rem;
  background: var(--surface-sunk); color: var(--ink-2);
}
.rank-no--1 { background: linear-gradient(150deg, #f6dc8f, #cfa233); color: #2a2110; }
.rank-no--2 { background: linear-gradient(150deg, #eef1f3, #b9c2c6); color: #23292b; }
.rank-no--3 { background: linear-gradient(150deg, #eabf95, #b3794a); color: #2b1a0d; }

.class-cell { display: flex; align-items: center; gap: 10px; }
.class-cell__code { font-weight: 650; letter-spacing: -.01em; }
.class-cell__meta { font-size: .74rem; color: var(--ink-3); }

.delta { display: inline-flex; align-items: center; gap: 3px; font-family: var(--mono); font-size: .76rem; }
.delta svg { width: 12px; height: 12px; }
.delta--up { color: var(--plus); }
.delta--down { color: var(--minus); }
.delta--flat { color: var(--ink-4); }

.score {
  font-family: var(--mono); font-size: 1.02rem; font-weight: 650; letter-spacing: -.02em;
}
.score--plus { color: var(--plus); }
.score--minus { color: var(--minus); }
.score--restore { color: var(--restore); }

/* Thanh thành phần điểm: nền 100 + cộng - trừ */
.bar {
  display: flex; height: 7px; width: 100%; min-width: 84px; border-radius: var(--r-full);
  overflow: hidden; background: var(--surface-sunk);
}
.bar__seg { height: 100%; }
.bar__seg--base { background: color-mix(in srgb, var(--ink-4) 42%, transparent); }
.bar__seg--plus { background: var(--plus); }
.bar__seg--minus { background: var(--minus); }
.bar__seg--restore { background: var(--restore); }

/* --------------------------- Bảng cuộn ngang ---------------------------- */
.scroll-x { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.scroll-x--tall { max-height: 68vh; overflow-y: auto; }

/* ------------------------------ Biểu mẫu -------------------------------- */
.field { display: grid; gap: 5px; }
.field > label, .field__label {
  font-size: .78rem; font-weight: 600; color: var(--ink-2);
}
.field__hint { font-size: .74rem; color: var(--ink-3); }
.field__error { font-size: .76rem; color: var(--minus); }
input[type="text"], input[type="password"], input[type="number"], input[type="date"],
input[type="search"], input[type="month"], select, textarea {
  width: 100%; padding: 9px 11px; font: inherit; font-size: .875rem;
  color: var(--ink); background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--r-sm);
  transition: border-color .15s, box-shadow .15s;
}
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--brand-3);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand-3) 18%, transparent);
}
input:disabled, select:disabled, textarea:disabled { background: var(--surface-sunk); color: var(--ink-3); }
textarea { min-height: 78px; resize: vertical; }
select {
  appearance: none; padding-inline-end: 32px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M2.5 4.5 6 8l3.5-3.5' fill='none' stroke='%236b7a73' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 11px center; background-size: 12px;
}
.form-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.form-grid--wide { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.form-grid .span-2 { grid-column: span 2; }
.form-grid .span-all { grid-column: 1 / -1; }
@media (max-width: 620px) {
  .form-grid .span-2 { grid-column: span 1; }
}
.check { display: flex; align-items: center; gap: 8px; font-size: .85rem; cursor: pointer; }
.check input { width: 16px; height: 16px; accent-color: var(--brand); flex: none; }

/* -------------------------------- Bộ lọc -------------------------------- */
.toolbar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 13px 20px; border-bottom: 1px solid var(--line-2); background: var(--surface-2);
}
.toolbar .spacer { margin-inline-start: auto; }
.toolbar label { font-size: .78rem; font-weight: 600; color: var(--ink-2); }
.toolbar select, .toolbar input { width: auto; min-width: 130px; padding-block: 7px; }

/* -------------------------------- Thẻ lớp ------------------------------- */
.class-card {
  display: grid; gap: 10px; padding: 16px; text-decoration: none; color: inherit;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  box-shadow: var(--shadow-1); transition: .18s;
}
.class-card:hover {
  border-color: var(--brand-3); box-shadow: var(--shadow-2);
  transform: translateY(-2px); text-decoration: none;
}
.class-card__top { display: flex; align-items: center; gap: 10px; }
.class-card__code { font-size: 1.15rem; font-weight: 700; letter-spacing: -.02em; }
.class-card__score { margin-inline-start: auto; font-family: var(--mono); font-size: 1.3rem; font-weight: 650; }
.class-card__foot { display: flex; align-items: center; gap: 10px; font-size: .78rem; color: var(--ink-3); }

/* ---------------------- Trang chi tiết lớp (phiếu báo cáo) --------------- */
.sheet {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-lg); box-shadow: var(--shadow-1); overflow: hidden;
}
.sheet__head {
  padding: 20px; border-bottom: 2px solid var(--brand);
  display: flex; gap: 18px; flex-wrap: wrap; align-items: flex-start;
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
}
.sheet__title { display: grid; gap: 4px; }
.sheet__title h2 { font-size: 1.2rem; }
.sheet__title .sub { font-size: .8rem; color: var(--ink-3); }
.sheet__meta {
  margin-inline-start: auto; display: grid; gap: 3px 18px; grid-template-columns: auto auto;
  font-size: .82rem;
}
.sheet__meta dt { color: var(--ink-3); }
.sheet__meta dd { margin: 0; font-weight: 600; }

.sheet__section { border-top: 1px solid var(--line-2); }
.sheet__section:first-of-type { border-top: none; }
.sheet__section-head {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 13px 20px; background: var(--surface-2); border-bottom: 1px solid var(--line-2);
}
.sheet__section-head h3 { font-size: .9rem; letter-spacing: .01em; text-transform: uppercase; font-weight: 650; }
.sheet__section-head .total { margin-inline-start: auto; font-family: var(--mono); font-weight: 650; font-size: 1rem; }

.data-table { width: 100%; border-collapse: collapse; font-size: .85rem; }
.data-table th {
  text-align: left; padding: 9px 12px; font-size: .7rem; letter-spacing: .07em;
  text-transform: uppercase; color: var(--ink-3); font-weight: 650;
  border-bottom: 1px solid var(--line); background: var(--surface-2); white-space: nowrap;
}
.data-table td { padding: 10px 12px; border-bottom: 1px solid var(--line-2); vertical-align: top; }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: var(--surface-2); }
.data-table .t-right { text-align: right; }
.data-table .t-center { text-align: center; }
.data-table .cell-detail { min-width: 220px; }
.data-table .cell-note { font-size: .78rem; color: var(--ink-3); }
.code-chip {
  font-family: var(--mono); font-size: .7rem; padding: 1px 6px; border-radius: var(--r-xs);
  background: var(--surface-sunk); color: var(--ink-2); white-space: nowrap;
  border: 1px solid var(--line-2);
}

.sheet__total {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  padding: 18px 20px; border-top: 2px solid var(--brand); background: var(--surface-2);
}
.sheet__total-main { margin-inline-start: auto; display: flex; align-items: baseline; gap: 10px; }
.sheet__total-main .label { font-size: .8rem; color: var(--ink-3); }
.sheet__total-main .value { font-family: var(--mono); font-size: 1.9rem; font-weight: 700; letter-spacing: -.03em; color: var(--brand); }
.sheet__formula {
  font-family: var(--mono); font-size: .8rem; color: var(--ink-3);
  background: var(--surface); padding: 6px 11px; border-radius: var(--r-sm); border: 1px solid var(--line);
}

/* ------------------------------ Nhóm điểm ------------------------------- */
.group-row { display: grid; gap: 7px; padding: 11px 0; border-bottom: 1px solid var(--line-2); }
.group-row:last-child { border-bottom: none; }
.group-row__head { display: flex; align-items: baseline; gap: 10px; font-size: .85rem; }
.group-row__name { font-weight: 600; }
.group-row__count { font-size: .75rem; color: var(--ink-3); }
.group-row__value { margin-inline-start: auto; font-family: var(--mono); font-weight: 600; }
.group-bar { height: 6px; border-radius: var(--r-full); background: var(--surface-sunk); overflow: hidden; }
.group-bar > span { display: block; height: 100%; border-radius: var(--r-full); }

/* ------------------------------ Thông báo ------------------------------- */
.notice {
  display: flex; gap: 11px; padding: 13px 15px; border-radius: var(--r-md);
  border: 1px solid var(--line); background: var(--surface); font-size: .86rem;
}
.notice svg { width: 17px; height: 17px; flex: none; margin-top: 2px; }
.notice--info    { background: var(--brand-soft);   border-color: color-mix(in srgb, var(--brand) 25%, transparent); color: var(--brand-ink); }
.notice--warning { background: var(--warn-soft);    border-color: color-mix(in srgb, var(--warn) 30%, transparent); color: var(--warn); }
.notice--success { background: var(--plus-soft);    border-color: color-mix(in srgb, var(--plus) 28%, transparent); color: var(--plus); }
.notice--error   { background: var(--minus-soft);   border-color: color-mix(in srgb, var(--minus) 30%, transparent); color: var(--minus); }
.notice strong { display: block; margin-bottom: 2px; }

.empty {
  padding: 44px 22px; text-align: center; color: var(--ink-3);
  display: grid; gap: 8px; justify-items: center;
}
.empty svg { width: 34px; height: 34px; color: var(--ink-4); }
.empty strong { color: var(--ink-2); font-size: .95rem; }
.empty p { margin: 0; font-size: .85rem; max-width: 46ch; }

/* ------------------------------ Đăng nhập ------------------------------- */
.auth { min-height: calc(100vh - 62px); display: grid; place-items: center; padding: 32px var(--pad); }
.auth__card { width: 100%; max-width: 420px; }
.auth__head { display: grid; gap: 12px; padding: 30px 26px 0; text-align: center; justify-items: center; }
.auth__body { padding: 22px 26px 26px; display: grid; gap: 14px; }
.auth__foot { padding: 0 26px 24px; text-align: center; font-size: .8rem; color: var(--ink-3); }

/* ------------------------------- Quản trị ------------------------------- */
.admin-layout { display: grid; grid-template-columns: 232px minmax(0, 1fr); gap: 22px; align-items: start; }
@media (max-width: 960px) { .admin-layout { grid-template-columns: 1fr; } }
.admin-nav {
  position: sticky; top: 78px; display: grid; gap: 2px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-md); padding: 8px; box-shadow: var(--shadow-1);
}
.admin-nav a {
  display: flex; align-items: center; gap: 9px; padding: 9px 11px;
  border-radius: var(--r-sm); font-size: .865rem; color: var(--ink-2); text-decoration: none;
  transition: .13s;
}
.admin-nav a:hover { background: var(--surface-2); color: var(--ink); text-decoration: none; }
.admin-nav a.is-active { background: var(--brand); color: #fff; font-weight: 550; }
.admin-nav a.is-active svg { color: #fff; }
.admin-nav svg { width: 16px; height: 16px; flex: none; color: var(--ink-3); }
.admin-nav__label {
  font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-4);
  padding: 12px 11px 5px; font-weight: 650;
}

.tabs { display: flex; gap: 3px; flex-wrap: wrap; border-bottom: 1px solid var(--line); padding: 0 20px; }
.tabs button {
  padding: 11px 14px; border: none; background: none; font: inherit; font-size: .865rem;
  color: var(--ink-3); cursor: pointer; border-bottom: 2px solid transparent;
  margin-bottom: -1px; font-weight: 550; transition: .13s;
}
.tabs button:hover { color: var(--ink); }
.tabs button.is-active { color: var(--brand); border-bottom-color: var(--brand); }
.tabs button .badge { margin-inline-start: 6px; }

/* ---------------------- Bảng ghi điểm nhanh ----------------------------- */
.quick-score { display: grid; gap: 0; }
.class-chip {
  display: flex; align-items: center; gap: 10px; width: 100%; padding: 9px 13px;
  border: 1px solid var(--line); border-radius: var(--r-sm); background: var(--surface);
  cursor: pointer; text-align: left; font: inherit; font-size: .875rem; transition: .13s;
}
.class-chip:hover { border-color: var(--brand-3); background: var(--surface-2); }
.class-chip.is-active { border-color: var(--brand); background: var(--brand-soft); color: var(--brand-ink); }
.class-chip__score { margin-inline-start: auto; font-family: var(--mono); font-weight: 650; }

.chip-group { display: grid; gap: 9px; }
.chip-group + .chip-group { margin-top: 18px; }
.chip-group__label {
  font-size: .72rem; font-weight: 650; letter-spacing: .09em; text-transform: uppercase;
  color: var(--ink-3); display: flex; align-items: center; gap: 8px;
}
.chip-group__label::after { content: ""; flex: 1; height: 1px; background: var(--line-2); }
.chip-group__label .muted { letter-spacing: 0; text-transform: none; font-weight: 500; }

.criteria-pick { display: grid; gap: 6px; max-height: 380px; overflow-y: auto; padding-right: 4px; }
.criteria-opt {
  display: grid; gap: 3px; padding: 10px 13px; text-align: left; width: 100%;
  border: 1px solid var(--line); border-radius: var(--r-sm); background: var(--surface);
  cursor: pointer; font: inherit; transition: .13s;
}
.criteria-opt:hover { border-color: var(--brand-3); background: var(--surface-2); }
.criteria-opt.is-active { border-color: var(--brand); background: var(--brand-soft); }
.criteria-opt__top { display: flex; align-items: center; gap: 8px; font-size: .865rem; font-weight: 550; }
.criteria-opt__points { margin-inline-start: auto; font-family: var(--mono); font-weight: 650; white-space: nowrap; }
.criteria-opt__sub { font-size: .74rem; color: var(--ink-3); }

/* ------------------------------ Hộp thoại ------------------------------- */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 60; display: grid; place-items: center;
  padding: 20px; background: rgba(12, 20, 17, .5); backdrop-filter: blur(3px);
  animation: fade .16s ease-out;
}
.modal {
  width: 100%; max-width: 620px; max-height: 88vh; overflow: auto;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-lg); box-shadow: var(--shadow-3);
  animation: rise .2s cubic-bezier(.2, .8, .3, 1);
}
.modal--wide { max-width: 880px; }
.modal__head {
  display: flex; align-items: center; gap: 12px; padding: 17px 20px;
  border-bottom: 1px solid var(--line-2); position: sticky; top: 0;
  background: var(--surface); z-index: 1;
}
.modal__head h2 { font-size: 1.05rem; }
.modal__head .icon-btn { margin-inline-start: auto; }
.modal__body { padding: 20px; display: grid; gap: 15px; }
.modal__foot {
  display: flex; align-items: center; gap: 10px; justify-content: flex-end;
  padding: 15px 20px; border-top: 1px solid var(--line-2); background: var(--surface-2);
  position: sticky; bottom: 0;
}
.modal__foot .spacer { margin-inline-start: auto; }
@keyframes fade { from { opacity: 0; } }
@keyframes rise { from { opacity: 0; transform: translateY(10px) scale(.99); } }

/* ------------------------------- Toast ---------------------------------- */
.toasts {
  position: fixed; inset-block-end: 22px; inset-inline-end: 22px; z-index: 90;
  display: grid; gap: 9px; justify-items: end; pointer-events: none;
}
.toast {
  display: flex; align-items: center; gap: 10px; max-width: 400px;
  padding: 12px 16px; border-radius: var(--r-md);
  background: var(--ink); color: var(--paper);
  box-shadow: var(--shadow-3); font-size: .865rem;
  animation: rise .2s cubic-bezier(.2, .8, .3, 1);
}
.toast svg { width: 17px; height: 17px; flex: none; }
.toast--success { background: var(--plus); color: #fff; }
.toast--error   { background: var(--minus); color: #fff; }
.toast--info    { background: var(--brand);  color: #fff; }

/* -------------------------------- Chân trang ---------------------------- */
.site-foot {
  border-top: 1px solid var(--line); background: var(--surface-2);
  padding: 26px 0; margin-top: 30px; font-size: .82rem; color: var(--ink-3);
}
.site-foot__inner {
  display: flex; gap: 20px; flex-wrap: wrap; align-items: center;
  width: 100%; max-width: var(--maxw); margin: 0 auto; padding-inline: var(--pad);
}
.site-foot strong { color: var(--ink-2); }
.site-foot .spacer { margin-inline-start: auto; }

/* -------------------------------- Tiện ích ------------------------------ */
.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.row--tight { gap: 6px; }
.stack { display: grid; gap: 14px; }
.muted { color: var(--ink-3); }
.small { font-size: .8rem; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.nowrap { white-space: nowrap; }
.divider { height: 1px; background: var(--line-2); border: 0; margin: 0; }

.skeleton {
  border-radius: var(--r-sm); background: linear-gradient(90deg, var(--surface-sunk) 25%, var(--surface-2) 50%, var(--surface-sunk) 75%);
  background-size: 200% 100%; animation: shimmer 1.4s infinite; height: 14px;
}
@keyframes shimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }
.spinner {
  width: 17px; height: 17px; border: 2.5px solid var(--line);
  border-top-color: var(--brand); border-radius: 50%; animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading { display: flex; align-items: center; justify-content: center; gap: 10px; padding: 40px; color: var(--ink-3); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

/* --------------------------------- In ấn -------------------------------- */
@media print {
  :root { --paper: #fff; --surface: #fff; --surface-2: #fff; --line: #bbb; --line-2: #ddd; }
  body { background: #fff; font-size: 11.5px; }
  .topbar, .site-foot, .admin-nav, .toolbar, .toasts, .no-print, .btn { display: none !important; }
  .page { padding: 0; gap: 12px; }
  .card, .sheet { border: 1px solid #999; box-shadow: none; border-radius: 0; break-inside: avoid; }
  .sheet__head { background: #fff; }
  .data-table th, .rank-table th { background: #f2f2f2; }
  .board { background: #fff !important; color: #000; border-color: #999; box-shadow: none; }
  .board__title h1, .board__stat b, .podium__code, .podium__score,
  .leader-card__code, .leader-card__score { color: #000 !important; }
  .board__title p, .board__stat span, .podium__meta, .board__week span,
  .leader-card__meta, .leader-card__rank, .leaders__note { color: #444 !important; }
  .podium__item, .board__week, .leader-card { background: #f5f5f5 !important; border-color: #bbb !important; }
  /* Logo in ra vẫn là hình tròn, bỏ viền đổ bóng cho gọn */
  .logo-mark { box-shadow: none !important; }
  a { color: #000; text-decoration: none; }
}

/* ------------------------------ Điện thoại ------------------------------ */
@media (max-width: 880px) {
  .nav {
    display: none; position: absolute; inset-inline: 0; top: 100%;
    flex-direction: column; gap: 2px; padding: 10px;
    background: var(--surface); border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-2); margin: 0;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 11px 13px; border-radius: var(--r-sm); }
  .nav-toggle { display: inline-grid; }
  .topbar__inner { position: relative; }
  .brand__text small { display: none; }
  .rank-table .hide-sm, .data-table .hide-sm { display: none; }
}
@media (max-width: 560px) {
  .board__week { margin-inline-start: 0; text-align: left; }
  .sheet__meta { grid-template-columns: auto 1fr; }
  .toasts { inset-inline: 12px; inset-block-end: 12px; justify-items: stretch; }
  .toast { max-width: none; }
}