/* Checkers Online — design tokens */

:root {
  color-scheme: dark;
  scrollbar-width: thin;
  scrollbar-color: rgba(148, 163, 184, 0.28) transparent;
  /* Chess.com Classic Green Board Palette */
  --board-light: #ebecd0;
  --board-dark: #779556;
  --board-border: #52673d;
  --sq-last-move: rgba(247, 247, 105, 0.55);
  --sq-must-capture: rgba(235, 77, 75, 0.25);

  /* Pieces */
  --piece-white: #ffffff;
  --piece-white-shade: #ece6dc;
  --piece-white-rim: #d1c8b9;
  --piece-black: #343230;
  --piece-black-shade: #1e1d1c;
  --piece-black-rim: #141312;

  /* Surfaces */
  --bg: #081018;
  --surface: #111b26;
  --surface-alt: #172433;
  --sidebar: #090f16;
  --sidebar-text: #edf4fb;
  --sidebar-muted: #9cacbb;
  --sidebar-hover: rgba(255, 255, 255, 0.07);
  --sidebar-active: linear-gradient(135deg, rgba(72, 201, 101, 0.28), rgba(56, 151, 85, 0.18));

  /* Text */
  --ink: #f3f7fb;
  --ink-secondary: #c7d2df;
  --muted: #93a3b4;
  --line: rgba(148, 163, 184, 0.16);
  --line-strong: rgba(148, 163, 184, 0.28);

  /* Accents (Chess.com signature green) */
  --accent: #69db72;
  --accent-hover: #88ef91;
  --accent-active: #4fbd59;
  --accent-ink: #ffffff;
  --danger: #d03939;
  --danger-hover: #b82e2e;
  --warn-bg: #fff8e8;
  --warn-border: #f0dda6;
  --warn-text: #8a6414;
  --ok-bg: #f1f8eb;
  --ok-border: #cde6b8;
  --ok-text: #3d6e1b;

  /* Type */
  --font: "Inter", "Noto Sans Armenian", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --fs-11: 11px;
  --fs-12: 12px;
  --fs-13: 13px;
  --fs-14: 14px;
  --fs-15: 15px;
  --fs-16: 16px;
  --fs-18: 18px;
  --fs-20: 20px;
  --fs-24: 24px;
  --fs-28: 28px;
  --fs-32: 32px;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-extrabold: 800;

  /* Spacing */
  --s-2: 2px;
  --s-4: 4px;
  --s-6: 6px;
  --s-8: 8px;
  --s-10: 10px;
  --s-12: 12px;
  --s-14: 14px;
  --s-16: 16px;
  --s-18: 18px;
  --s-20: 20px;
  --s-24: 24px;
  --s-28: 28px;
  --s-32: 32px;
  --s-40: 40px;
  --s-48: 48px;

  /* Geometry & Shadows */
  --radius-sm: 4px;
  --radius-card: 8px;
  --radius-lg: 12px;
  --radius-pill: 9999px;
  --shadow-sm: 0 10px 24px rgba(0, 0, 0, 0.18);
  --shadow-card: 0 18px 44px rgba(0, 0, 0, 0.24);
  --shadow-modal: 0 24px 60px rgba(0, 0, 0, 0.46);

  --sidebar-width: 250px;
  --header-mobile: 52px;
  --bottom-nav-base: 60px;
  --bottom-nav: calc(var(--bottom-nav-base) + env(safe-area-inset-bottom, 0px));
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-weight: var(--fw-regular);
  font-size: var(--fs-15);
  line-height: 1.45;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-weight: var(--fw-bold);
  letter-spacing: 0;
  color: var(--ink);
  margin: 0;
}

h1 { font-size: var(--fs-28); line-height: 1.2; }
h2 { font-size: var(--fs-20); line-height: 1.25; }
h3 { font-size: var(--fs-16); line-height: 1.3; }

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

button,
input,
select,
textarea {
  font: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

*::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

*::-webkit-scrollbar-track {
  background: transparent;
}

*::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.28);
  border-radius: 9999px;
}

*::-webkit-scrollbar-thumb:hover {
  background: rgba(148, 163, 184, 0.45);
}

.hidden {
  display: none !important;
}

.muted {
  color: var(--muted);
  font-size: var(--fs-14);
}

/* —— Buttons —— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-8);
  height: 44px;
  padding: 0 var(--s-18);
  border: 1px solid transparent;
  border-radius: var(--radius-card);
  font-size: var(--fs-15);
  font-weight: var(--fw-bold);
  cursor: pointer;
  user-select: none;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease, transform 0.08s ease;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
  box-shadow: 0 2px 0 #5f8d34;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-primary:active:not(:disabled) {
  background: var(--accent-active);
  box-shadow: none;
}

.btn-ghost {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line-strong);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--surface-alt);
  border-color: #bcbab5;
}

.btn-danger {
  background: var(--danger);
  color: #ffffff;
  border-color: var(--danger);
  box-shadow: 0 2px 0 #9c2727;
}

.btn-danger:hover:not(:disabled) {
  background: var(--danger-hover);
  border-color: var(--danger-hover);
}

.btn-sm {
  height: 34px;
  padding: 0 var(--s-12);
  font-size: var(--fs-13);
  font-weight: var(--fw-semibold);
}

.btn-block {
  width: 100%;
}

.btn [data-lucide] {
  width: 18px;
  height: 18px;
  stroke-width: 2.2;
}

/* —— Form Fields —— */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
}

.field label {
  font-size: var(--fs-12);
  font-weight: var(--fw-semibold);
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.field input,
.field select,
.field textarea {
  height: 44px;
  padding: 0 var(--s-12);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink);
  outline: none;
  font-size: 16px;
  transition: border-color 0.12s ease, box-shadow 0.12s ease;
}

.field input:focus,
.field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(129, 182, 76, 0.22);
}

.field input.is-error,
.field select.is-error {
  border-color: var(--danger);
}

.field-error {
  font-size: var(--fs-12);
  color: var(--danger);
  min-height: 16px;
}

/* —— Cards —— */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: var(--s-20);
}

/* —— Lucide Icons —— */
[data-lucide] {
  width: 20px;
  height: 20px;
  stroke-width: 2;
  flex-shrink: 0;
}