/* 四维创界 Design Tokens v14
 * Dark product register with one champagne accent.
 */

:root {
  color-scheme: dark;

  /* Brand and interaction */
  --primary-50: oklch(0.79 0.065 82 / 0.08);
  --primary-100: oklch(0.79 0.065 82 / 0.13);
  --primary-200: oklch(0.86 0.045 82);
  --primary-300: oklch(0.82 0.06 82);
  --primary-400: oklch(0.79 0.065 82);
  --primary-500: oklch(0.75 0.07 82);
  --primary-600: oklch(0.69 0.068 82);
  --primary-700: oklch(0.88 0.045 82);

  --accent-50: var(--primary-50);
  --accent-100: var(--primary-100);
  --accent-200: var(--primary-200);
  --accent-300: var(--primary-300);
  --accent-400: var(--primary-400);
  --accent-500: var(--primary-500);
  --accent-600: var(--primary-600);
  --accent-700: var(--primary-700);
  --violet-500: var(--primary-400);

  /* Surfaces */
  --bg-base: oklch(0.105 0.006 165);
  --bg-subtle: oklch(0.145 0.008 165);
  --bg-elevated: oklch(0.18 0.009 165);
  --bg-overlay: oklch(0.06 0.004 165 / 0.82);

  --surface-canvas: var(--bg-base);
  --surface-panel: var(--bg-subtle);
  --surface-control: var(--bg-elevated);
  --surface-hover: oklch(0.215 0.01 165);
  --surface-selected: oklch(0.79 0.065 82 / 0.1);

  /* Lines */
  --border-default: oklch(0.93 0.01 90 / 0.11);
  --border-strong: oklch(0.93 0.01 90 / 0.2);
  --border-focus: var(--primary-400);
  --border-subtle: oklch(0.93 0.01 90 / 0.065);

  /* Text */
  --text-primary: oklch(0.94 0.008 88);
  --text-secondary: oklch(0.76 0.012 95);
  --text-tertiary: oklch(0.64 0.012 95);
  --text-disabled: oklch(0.47 0.01 95);
  --text-on-primary: oklch(0.12 0.006 165);
  --text-link: oklch(0.86 0.045 82);

  /* Semantic state */
  --success: oklch(0.75 0.14 154);
  --success-bg: oklch(0.75 0.14 154 / 0.1);
  --warning: oklch(0.8 0.13 80);
  --warning-bg: oklch(0.8 0.13 80 / 0.1);
  --danger: oklch(0.7 0.18 24);
  --danger-bg: oklch(0.7 0.18 24 / 0.1);
  --danger-hover: oklch(0.64 0.2 24);
  --info: oklch(0.72 0.11 240);
  --info-bg: oklch(0.72 0.11 240 / 0.1);

  /* Typography */
  --font-sans: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-brand: "Songti SC", STSong, "Noto Serif SC", SimSun, serif;
  --font-mono: "Cascadia Code", "SFMono-Regular", Consolas, monospace;

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;

  --leading-tight: 1.25;
  --leading-normal: 1.55;
  --leading-relaxed: 1.75;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Shape rule: panels 12, controls 8, media 14, pills full */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 14px;
  --radius-full: 9999px;

  /* Shadows are only for floating layers, never bordered content panels */
  --shadow-xs: 0 1px 2px oklch(0.04 0 0 / 0.28);
  --shadow-sm: 0 2px 6px oklch(0.04 0 0 / 0.24);
  --shadow-md: 0 4px 8px oklch(0.04 0 0 / 0.28);
  --shadow-lg: 0 8px 16px oklch(0.04 0 0 / 0.34);
  --shadow-xl: 0 12px 24px oklch(0.04 0 0 / 0.42);
  --shadow-focus: 0 0 0 3px oklch(0.79 0.065 82 / 0.22);
  --shadow-accent-glow: none;

  /* Motion */
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-base: 200ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 260ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

  /* Icon surfaces */
  --surface-icon-primary: var(--surface-selected);
  --surface-icon-accent: var(--surface-selected);
  --surface-icon-warm: var(--warning-bg);
  --surface-icon-rose: var(--danger-bg);
  --surface-icon-violet: var(--surface-selected);
  --surface-icon-success: var(--success-bg);

  --icon-fg-on-brand: var(--text-on-primary);
  --icon-fg-on-accent: var(--primary-300);
  --icon-fg-violet: var(--primary-300);
  --icon-fg-warm: var(--warning);
  --icon-fg-rose: var(--danger);
  --icon-fg-success: var(--success);

  /* Layout */
  --topbar-height: 68px;
  --sidebar-width: 232px;
  --nav-rail-width: 72px;
  --content-max-width: 1480px;
  --doc-max-width: 780px;

  /* Layer scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-overlay: 400;
  --z-modal: 410;
  --z-toast: 500;
  --z-tooltip: 600;
}