/* =====================================================================
   顺路 Shunlu — tokens & base
   Layout: a campus wayfinding system. Concrete-grey ground; guide-sign
   blue panels carry navigation; white thermal waybills carry tasks;
   road-sign yellow / red / green are reserved for warn / stop / go.
   ===================================================================== */

:root {
  /* ground & paper */
  --ground: #E5E8EC;
  --ground-2: #D9DEE4;
  --paper: #FFFFFF;
  --paper-2: #F2F4F7;
  /* ink */
  --ink: #0B1524;
  --ink-2: #3D495B;
  --ink-3: #5B6679;
  --rule: rgba(11, 21, 36, 0.1);
  --rule-2: rgba(11, 21, 36, 0.2);
  /* road-sign palette */
  --sign: #0A4AA6;
  --sign-hi: #1458C2;
  --sign-lo: #073A84;
  --sign-tint: #D9E4F5;
  --on-sign: #FFFFFF;
  --warn: #F5C21B;
  --warn-tint: #FAEDBF;
  --on-warn: #1B1604;
  --stop: #CF2A1F;
  --stop-tint: #F7DFDB;
  --go: #0A7A4C;
  --go-tint: #D8EEE3;
  --exit: #0B6A45;
  /* text on tints */
  --sign-ink: #0A4AA6;
  --go-ink: #087046;
  --stop-ink: #BC2318;
  --warn-ink: #6F5300;
  /* physical sign faces (retroreflective sheeting) */
  --rs-blue: #0A4AA6;
  --rs-white: #FFFFFF;
  --rs-black: #121417;
  --rs-yellow: #F5C21B;
  --rs-red: #CF2A1F;
  --rs-green: #0B6A45;
  /* night road */
  --asphalt: #14171C;
  --asphalt-2: #1F242B;
  --led: #FFB42B;
  /* map */
  --road: #C8CFD8;
  --zone: rgba(10, 74, 166, 0.055);
  --zone-ink: rgba(10, 74, 166, 0.62);
  /* avatar tints */
  --av-1: #D6E2F4;
  --av-2: #F4E7BA;
  --av-3: #D4ECDF;
  --av-4: #EADCD1;
  --av-5: #DCE1E8;
  /* depth */
  --scrim: rgba(8, 14, 24, 0.44);
  --shadow-1: 0 1px 0 rgba(11, 21, 36, 0.04), 0 1px 3px rgba(11, 21, 36, 0.07);
  --shadow-2: 0 1px 0 rgba(11, 21, 36, 0.04), 0 14px 34px -18px rgba(11, 21, 36, 0.34);
  --shadow-3: 0 34px 80px -34px rgba(11, 21, 36, 0.55), 0 2px 8px rgba(11, 21, 36, 0.08);

  /* type */
  --f-display: "Barlow", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --f-ui: "Barlow", "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --f-label: "Barlow Semi Condensed", "Barlow", "PingFang SC", "Microsoft YaHei", sans-serif;
  --t-xs: 12px;
  --t-sm: 13px;
  --t-base: 15px;
  --t-md: 17px;
  --t-lg: 20px;
  --t-xl: clamp(22px, 2.2vw, 28px);
  --t-2xl: clamp(28px, 3.4vw, 44px);
  --t-3xl: clamp(36px, 5.2vw, 68px);
  --t-hero: clamp(46px, 8vw, 124px);

  /* motion */
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-io: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* shape */
  --r-sign: 12px;
  --r-paper: 6px;
  --r-ctl: 10px;

  /* layout */
  --gutter: clamp(16px, 4vw, 48px);
  --maxw: 1320px;
  --bar-h: 64px;
  --tab-h: 62px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #0C0F13;
    --ground-2: #151A20;
    --paper: #161B21;
    --paper-2: #1D232A;
    --ink: #E7EBF0;
    --ink-2: #A7B1BE;
    --ink-3: #7D8898;
    --rule: rgba(231, 235, 240, 0.09);
    --rule-2: rgba(231, 235, 240, 0.18);
    --sign: #1A58C6;
    --sign-hi: #2A68D8;
    --sign-lo: #134AAE;
    --sign-tint: rgba(56, 120, 230, 0.18);
    --on-sign: #FFFFFF;
    --warn: #FFCF2E;
    --warn-tint: rgba(255, 207, 46, 0.15);
    --on-warn: #1B1604;
    --stop: #FF5B4F;
    --stop-tint: rgba(255, 91, 79, 0.15);
    --go: #2FC48A;
    --go-tint: rgba(47, 196, 138, 0.15);
    --exit: #0D7A4F;
    --asphalt: #07090B;
    --asphalt-2: #12161A;
    --led: #FFB42B;
    --road: #2A313A;
    --zone: rgba(56, 120, 230, 0.07);
    --zone-ink: rgba(140, 180, 255, 0.6);
    --av-1: #23395E;
    --av-2: #4A3F17;
    --av-3: #17402E;
    --av-4: #4A3426;
    --av-5: #2B323C;
    --scrim: rgba(0, 0, 0, 0.6);
    --shadow-1: 0 1px 0 rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-2: 0 1px 0 rgba(0, 0, 0, 0.3), 0 16px 38px -18px rgba(0, 0, 0, 0.8);
    --shadow-3: 0 34px 80px -30px rgba(0, 0, 0, 0.9), 0 2px 8px rgba(0, 0, 0, 0.5);
    --sign-ink: #8DB4FF;
    --go-ink: #5FD9A6;
    --stop-ink: #FF8A80;
    --warn-ink: #FFD95E;
    --rs-blue: #1A58C6;
    --rs-white: #E9EDF1;
    --rs-black: #121417;
    --rs-yellow: #F2C52A;
    --rs-red: #E0392D;
    --rs-green: #0E7A50;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --ground: #0C0F13;
  --ground-2: #151A20;
  --paper: #161B21;
  --paper-2: #1D232A;
  --ink: #E7EBF0;
  --ink-2: #A7B1BE;
  --ink-3: #7D8898;
  --rule: rgba(231, 235, 240, 0.09);
  --rule-2: rgba(231, 235, 240, 0.18);
  --sign: #1A58C6;
  --sign-hi: #2A68D8;
  --sign-lo: #134AAE;
  --sign-tint: rgba(56, 120, 230, 0.18);
  --on-sign: #FFFFFF;
  --warn: #FFCF2E;
  --warn-tint: rgba(255, 207, 46, 0.15);
  --on-warn: #1B1604;
  --stop: #FF5B4F;
  --stop-tint: rgba(255, 91, 79, 0.15);
  --go: #2FC48A;
  --go-tint: rgba(47, 196, 138, 0.15);
  --exit: #0D7A4F;
  --asphalt: #07090B;
  --asphalt-2: #12161A;
  --led: #FFB42B;
  --road: #2A313A;
  --zone: rgba(56, 120, 230, 0.07);
  --zone-ink: rgba(140, 180, 255, 0.6);
  --av-1: #23395E;
  --av-2: #4A3F17;
  --av-3: #17402E;
  --av-4: #4A3426;
  --av-5: #2B323C;
  --scrim: rgba(0, 0, 0, 0.6);
  --shadow-1: 0 1px 0 rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-2: 0 1px 0 rgba(0, 0, 0, 0.3), 0 16px 38px -18px rgba(0, 0, 0, 0.8);
  --shadow-3: 0 34px 80px -30px rgba(0, 0, 0, 0.9), 0 2px 8px rgba(0, 0, 0, 0.5);
  --sign-ink: #8DB4FF;
  --go-ink: #5FD9A6;
  --stop-ink: #FF8A80;
  --warn-ink: #FFD95E;
  --rs-blue: #1A58C6;
  --rs-white: #E9EDF1;
  --rs-black: #121417;
  --rs-yellow: #F2C52A;
  --rs-red: #E0392D;
  --rs-green: #0E7A50;
  color-scheme: dark;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  scroll-padding-top: calc(var(--bar-h) + 16px);
}

:root {
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--ground);
  color: var(--ink);
  font: 400 var(--t-base)/1.6 var(--f-ui);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

html.is-locked,
html.is-locked body { overflow: hidden; }

img,
video { display: block; max-width: 100%; }

svg { max-width: 100%; }

button,
input,
select,
textarea { font: inherit; color: inherit; letter-spacing: inherit; }

button {
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  touch-action: manipulation;
}

a { color: inherit; text-decoration: none; }

[hidden] { display: none !important; }

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.12;
  text-wrap: balance;
}

p { margin: 0; text-wrap: pretty; }
ol, ul { margin: 0; padding: 0; list-style: none; }
dl, dd { margin: 0; }

:focus-visible {
  outline: 2.5px solid var(--sign);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection { background: var(--warn); color: var(--on-warn); }

.num {
  font-family: "Barlow", var(--f-ui);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.label {
  font: 600 var(--t-xs)/1.2 var(--f-label);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.nb { white-space: nowrap; }

.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.ic {
  width: 1.25em;
  height: 1.25em;
  flex: none;
  display: inline-block;
  vertical-align: -0.25em;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}