/* ---------- Material 3 Expressive design tokens (shared, light + dark) ---------- */
:root {
  color-scheme: light;

  --color-primary: #5850e6;
  --color-on-primary: #ffffff;
  --color-primary-container: #ece3f7;
  --color-on-primary-container: #362f4a;

  --color-secondary: #6d6577;
  --color-secondary-container: #eae3f0;
  --color-on-secondary-container: #302a3a;

  --color-tertiary: #8a6169;
  --color-tertiary-container: #f7e2e4;
  --color-on-tertiary-container: #3a2327;

  --color-success: #4f7a5a;
  --color-success-container: #d9f0dd;
  --color-on-success-container: #12321b;

  --color-error: #a3453d;
  --color-error-container: #f8ded9;
  --color-on-error-container: #3c140f;

  --color-holiday: #8a5a12;
  --color-holiday-container: #fbe4bd;
  --color-on-holiday-container: #4a3000;

  --color-school: #2f6690;
  --color-school-container: #d9ecf8;
  --color-on-school-container: #0c3348;

  --color-surface: #fdfaf9;
  --color-surface-container: #f2eef3;
  --color-surface-container-high: #ece7ee;
  --color-background: #fdfaf9;
  --color-outline: #7a7480;
  --color-outline-variant: #cbc4d1;
  --color-on-surface: #1d1b20;
  --color-on-surface-variant: #4a4553;

  --overlay-on-hero: rgba(0, 0, 0, 0.08);
  --overlay-on-hero-strong: rgba(0, 0, 0, 0.16);

  --font-body: "Roboto", -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-display: "Inter", "Roboto", -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;

  --shape-xs: 8px;
  --shape-sm: 12px;
  --shape-md: 16px;
  --shape-lg: 24px;
  --shape-xl: 28px;
  --shape-full: 999px;

  --elevation-1: 0px 1px 2px 0px rgba(0,0,0,0.30), 0px 1px 3px 1px rgba(0,0,0,0.15);
  --elevation-2: 0px 1px 2px 0px rgba(0,0,0,0.30), 0px 2px 6px 2px rgba(0,0,0,0.15);
  --elevation-3: 0px 1px 3px 0px rgba(0,0,0,0.30), 0px 4px 8px 3px rgba(0,0,0,0.15);
  --elevation-4: 0px 2px 3px 0px rgba(0,0,0,0.30), 0px 6px 10px 4px rgba(0,0,0,0.15);
  --shadow-cta: 0px 10px 24px -8px rgba(88, 80, 230, 0.45);

  --motion-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --motion-standard: cubic-bezier(0.2, 0, 0, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;

    --color-primary: #b8b0ff;
    --color-on-primary: #211c4d;
    --color-primary-container: #4a4160;
    --color-on-primary-container: #e7dcf7;

    --color-secondary: #cdc4d6;
    --color-secondary-container: #433c4d;
    --color-on-secondary-container: #e9e0f0;

    --color-tertiary: #e3b8bd;
    --color-tertiary-container: #5c3b3f;
    --color-on-tertiary-container: #f8dde0;

    --color-success: #a8d1ae;
    --color-success-container: #294a30;
    --color-on-success-container: #c3e8c8;

    --color-error: #eba9a2;
    --color-error-container: #632b24;
    --color-on-error-container: #f6d9d4;

    --color-holiday: #f0c37a;
    --color-holiday-container: #5c4419;
    --color-on-holiday-container: #ffe4b3;

    --color-school: #a8cdea;
    --color-school-container: #2b4c63;
    --color-on-school-container: #d3ecfa;

    --color-surface: #1e1c22;
    --color-surface-container: #26232a;
    --color-surface-container-high: #302d35;
    --color-background: #161418;
    --color-outline: #8f899a;
    --color-outline-variant: #48414f;
    --color-on-surface: #e7e1e8;
    --color-on-surface-variant: #cac2d1;

    --overlay-on-hero: rgba(255, 255, 255, 0.12);
    --overlay-on-hero-strong: rgba(255, 255, 255, 0.22);
  }

  :root:not([data-theme="light"]) .theme-toggle .icon-light { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .icon-dark { display: inline-flex; }
}

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

  --color-primary: #b8b0ff;
  --color-on-primary: #211c4d;
  --color-primary-container: #4a4160;
  --color-on-primary-container: #e7dcf7;

  --color-secondary: #cdc4d6;
  --color-secondary-container: #433c4d;
  --color-on-secondary-container: #e9e0f0;

  --color-tertiary: #e3b8bd;
  --color-tertiary-container: #5c3b3f;
  --color-on-tertiary-container: #f8dde0;

  --color-success: #a8d1ae;
  --color-success-container: #294a30;
  --color-on-success-container: #c3e8c8;

  --color-error: #eba9a2;
  --color-error-container: #632b24;
  --color-on-error-container: #f6d9d4;

  --color-holiday: #f0c37a;
  --color-holiday-container: #5c4419;
  --color-on-holiday-container: #ffe4b3;

  --color-school: #a8cdea;
  --color-school-container: #2b4c63;
  --color-on-school-container: #d3ecfa;

  --color-surface: #1e1c22;
  --color-surface-container: #26232a;
  --color-surface-container-high: #302d35;
  --color-background: #161418;
  --color-outline: #8f899a;
  --color-outline-variant: #48414f;
  --color-on-surface: #e7e1e8;
  --color-on-surface-variant: #cac2d1;

  --overlay-on-hero: rgba(255, 255, 255, 0.12);
  --overlay-on-hero-strong: rgba(255, 255, 255, 0.22);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-background);
  color: var(--color-on-surface);
  font-family: var(--font-body);
}

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

/* Circular icon button used on hero/gradient surfaces (topbar, login page) */
.icon-btn {
  appearance: none;
  border: none;
  background: var(--overlay-on-hero);
  color: inherit;
  width: 40px;
  height: 40px;
  border-radius: var(--shape-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s var(--motion-standard), transform 0.15s var(--motion-spring);
}
.icon-btn:hover { background: var(--overlay-on-hero-strong); }
.icon-btn:active { transform: scale(0.92); }
.icon-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.icon-btn:disabled:hover { background: var(--overlay-on-hero); }
.icon-btn:disabled:active { transform: none; }

.theme-toggle .icon-dark { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-light { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-dark { display: inline-flex; }