/* ======================================================================
   TRADER PREMIUM FOUNDATION — CYCLE 1/5

   Scope:
   - Visual-language primitives only. No workflow or business-logic changes.
   - Establishes semantic design tokens shared by Light and Dark.
   - Adds conservative global typography, focus, selection and scrollbar polish.
   - Component-level redesign belongs to later premium cycles.
====================================================================== */

:root {
  /* Typography */
  --ui-font-sans: "Segoe UI Variable", "Aptos", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, sans-serif;
  --ui-font-mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --ui-font-size-2xs: 11px;
  --ui-font-size-xs: 12px;
  --ui-font-size-sm: 13px;
  --ui-font-size-md: 14px;
  --ui-font-size-lg: 16px;
  --ui-font-size-xl: 18px;
  --ui-font-size-2xl: 22px;
  --ui-font-size-3xl: 28px;

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

  --ui-leading-tight: 1.25;
  --ui-leading-snug: 1.38;
  --ui-leading-normal: 1.5;
  --ui-leading-relaxed: 1.62;

  --ui-tracking-tight: -0.018em;
  --ui-tracking-normal: 0;
  --ui-tracking-wide: 0.018em;

  /* Spacing — 4px rhythm */
  --ui-space-0: 0;
  --ui-space-1: 4px;
  --ui-space-2: 8px;
  --ui-space-3: 12px;
  --ui-space-4: 16px;
  --ui-space-5: 20px;
  --ui-space-6: 24px;
  --ui-space-7: 28px;
  --ui-space-8: 32px;
  --ui-space-10: 40px;
  --ui-space-12: 48px;
  --ui-space-16: 64px;

  /* Geometry */
  --ui-radius-xs: 6px;
  --ui-radius-sm: 8px;
  --ui-radius-md: 10px;
  --ui-radius-lg: 14px;
  --ui-radius-xl: 18px;
  --ui-radius-2xl: 24px;
  --ui-radius-pill: 999px;

  --ui-border-width: 1px;
  --ui-control-height-sm: 32px;
  --ui-control-height-md: 38px;
  --ui-control-height-lg: 44px;

  /* Data density */
  --ui-table-cell-py: 11px;
  --ui-table-cell-px: 14px;
  --ui-table-head-py: 10px;
  --ui-table-head-px: 14px;
  --ui-table-font-size: 13px;
  --ui-table-head-size: 12px;
  --ui-table-row-min-height: 42px;

  /* Motion */
  --ui-duration-fast: 110ms;
  --ui-duration-base: 160ms;
  --ui-duration-slow: 240ms;
  --ui-ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --ui-ease-emphasized: cubic-bezier(0.2, 0.8, 0.2, 1);

  /* Layout */
  --ui-content-max: 1440px;
  --ui-content-gutter: clamp(14px, 2vw, 28px);
  --ui-section-gap: clamp(18px, 2vw, 28px);

  /* Z-index scale */
  --ui-z-base: 1;
  --ui-z-sticky: 100;
  --ui-z-dropdown: 1000;
  --ui-z-overlay: 1100;
  --ui-z-modal: 1200;
  --ui-z-toast: 1300;
}

/* ----------------------------------------------------------------------
   Semantic colour / elevation tokens
------------------------------------------------------------------------ */
:root,
html[data-theme="dark"] {
  --ui-bg-app: var(--skin-app-bg);
  --ui-surface-canvas: var(--skin-canvas-bg);
  --ui-surface-card: var(--skin-panel-bg);
  --ui-surface-raised: var(--skin-panel-bg-strong);
  --ui-surface-input: var(--skin-input-bg);
  --ui-surface-soft: rgba(255, 255, 255, 0.035);
  --ui-surface-hover: rgba(148, 163, 184, 0.075);
  --ui-surface-pressed: rgba(148, 163, 184, 0.12);

  --ui-text-strong: var(--skin-title-color);
  --ui-text: var(--skin-text-color);
  --ui-text-secondary: #b4c2d2;
  --ui-text-muted: var(--skin-muted-color);
  --ui-text-disabled: #62748a;
  --ui-text-inverse: #111827;

  --ui-border-subtle: rgba(148, 163, 184, 0.12);
  --ui-border: var(--skin-panel-border);
  --ui-border-strong: rgba(148, 163, 184, 0.26);
  --ui-divider: rgba(148, 163, 184, 0.10);

  --ui-data-head-bg: #101d31;
  --ui-data-row-even: rgba(148, 163, 184, 0.026);
  --ui-data-row-hover: rgba(212, 175, 55, 0.065);
  --ui-data-row-selected: rgba(212, 175, 55, 0.10);
  --ui-data-total-bg: rgba(212, 175, 55, 0.060);
  --ui-data-total-border: rgba(212, 175, 55, 0.22);
  --ui-success-soft: rgba(34, 197, 94, 0.10);
  --ui-success-soft-border: rgba(34, 197, 94, 0.24);
  --ui-danger-soft: rgba(248, 113, 113, 0.10);
  --ui-danger-soft-border: rgba(248, 113, 113, 0.24);
  --ui-warning-soft: rgba(245, 185, 66, 0.11);
  --ui-warning-soft-border: rgba(245, 185, 66, 0.25);
  --ui-info-soft: rgba(96, 165, 250, 0.10);
  --ui-info-soft-border: rgba(96, 165, 250, 0.24);

  --ui-accent: var(--skin-primary-btn-bg);
  --ui-accent-hover: #e0bd4f;
  --ui-accent-pressed: #c79f2f;
  --ui-accent-contrast: var(--skin-primary-btn-text);
  --ui-accent-soft: rgba(212, 175, 55, 0.11);
  --ui-accent-soft-border: rgba(212, 175, 55, 0.28);

  --ui-link: var(--skin-link-color);
  --ui-link-hover: var(--skin-link-hover-color);
  --ui-focus: var(--skin-focus-color);
  --ui-focus-ring: rgba(234, 179, 8, 0.28);

  --ui-success: var(--skin-positive-color);
  --ui-danger: var(--skin-negative-color);
  --ui-warning: #f5b942;
  --ui-info: #60a5fa;

  --ui-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.30);
  --ui-shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.24);
  --ui-shadow-md: 0 10px 28px rgba(0, 0, 0, 0.30);
  --ui-shadow-lg: 0 18px 46px rgba(0, 0, 0, 0.36);
  --ui-shadow-float: 0 24px 64px rgba(0, 0, 0, 0.42);

  --ui-scrollbar-track: rgba(255, 255, 255, 0.025);
  --ui-scrollbar-thumb: rgba(148, 163, 184, 0.28);
  --ui-scrollbar-thumb-hover: rgba(148, 163, 184, 0.44);

  --ui-selection-bg: rgba(212, 175, 55, 0.30);
  --ui-selection-text: #fff8dd;

  /* Screen-level hierarchy */
  --ui-screen-shell-bg: linear-gradient(180deg, rgba(15, 29, 49, 0.985) 0%, rgba(9, 19, 36, 0.985) 100%);
  --ui-screen-shell-border: rgba(148, 163, 184, 0.16);
  --ui-screen-shell-highlight: rgba(255, 255, 255, 0.035);
  --ui-screen-card-bg: rgba(13, 25, 44, 0.92);
  --ui-screen-card-border: rgba(148, 163, 184, 0.14);
  --ui-screen-toolbar-bg: rgba(255, 255, 255, 0.018);
  --ui-screen-accent-line: linear-gradient(90deg, transparent 0%, rgba(212, 175, 55, 0.72) 28%, rgba(96, 165, 250, 0.42) 72%, transparent 100%);
  --ui-screen-accent-glow: rgba(212, 175, 55, 0.075);
  --ui-screen-title-bg: rgba(13, 25, 44, 0.82);
  --ui-screen-title-border: rgba(148, 163, 184, 0.14);
  --ui-screen-kpi-bg: rgba(212, 175, 55, 0.075);
  --ui-screen-kpi-border: rgba(212, 175, 55, 0.20);
}

html[data-theme="light"] {
  --ui-bg-app: var(--skin-app-bg);
  --ui-surface-canvas: var(--skin-canvas-bg);
  --ui-surface-card: var(--skin-panel-bg);
  --ui-surface-raised: var(--skin-panel-bg-strong);
  --ui-surface-input: var(--skin-input-bg);
  --ui-surface-soft: rgba(15, 23, 42, 0.025);
  --ui-surface-hover: rgba(37, 99, 235, 0.055);
  --ui-surface-pressed: rgba(37, 99, 235, 0.09);

  --ui-text-strong: var(--skin-title-color);
  --ui-text: var(--skin-text-color);
  --ui-text-secondary: #475467;
  --ui-text-muted: var(--skin-muted-color);
  --ui-text-disabled: #98a2b3;
  --ui-text-inverse: #ffffff;

  --ui-border-subtle: rgba(15, 23, 42, 0.075);
  --ui-border: var(--skin-panel-border);
  --ui-border-strong: rgba(15, 23, 42, 0.16);
  --ui-divider: rgba(15, 23, 42, 0.075);

  --ui-data-head-bg: #f6f8fb;
  --ui-data-row-even: rgba(15, 23, 42, 0.018);
  --ui-data-row-hover: rgba(37, 99, 235, 0.050);
  --ui-data-row-selected: rgba(37, 99, 235, 0.085);
  --ui-data-total-bg: rgba(37, 99, 235, 0.045);
  --ui-data-total-border: rgba(37, 99, 235, 0.18);
  --ui-success-soft: rgba(22, 163, 74, 0.075);
  --ui-success-soft-border: rgba(22, 163, 74, 0.20);
  --ui-danger-soft: rgba(220, 38, 38, 0.065);
  --ui-danger-soft-border: rgba(220, 38, 38, 0.18);
  --ui-warning-soft: rgba(217, 119, 6, 0.075);
  --ui-warning-soft-border: rgba(217, 119, 6, 0.20);
  --ui-info-soft: rgba(37, 99, 235, 0.065);
  --ui-info-soft-border: rgba(37, 99, 235, 0.18);

  --ui-accent: var(--skin-primary-btn-bg);
  --ui-accent-hover: #1d4ed8;
  --ui-accent-pressed: #1e40af;
  --ui-accent-contrast: var(--skin-primary-btn-text);
  --ui-accent-soft: rgba(37, 99, 235, 0.075);
  --ui-accent-soft-border: rgba(37, 99, 235, 0.20);

  --ui-link: var(--skin-link-color);
  --ui-link-hover: var(--skin-link-hover-color);
  --ui-focus: var(--skin-focus-color);
  --ui-focus-ring: rgba(59, 130, 246, 0.22);

  --ui-success: var(--skin-positive-color);
  --ui-danger: var(--skin-negative-color);
  --ui-warning: #d97706;
  --ui-info: #2563eb;

  --ui-shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.06);
  --ui-shadow-sm: 0 4px 12px rgba(15, 23, 42, 0.075);
  --ui-shadow-md: 0 10px 28px rgba(15, 23, 42, 0.10);
  --ui-shadow-lg: 0 18px 46px rgba(15, 23, 42, 0.13);
  --ui-shadow-float: 0 24px 64px rgba(15, 23, 42, 0.17);

  --ui-scrollbar-track: rgba(15, 23, 42, 0.025);
  --ui-scrollbar-thumb: rgba(71, 84, 103, 0.24);
  --ui-scrollbar-thumb-hover: rgba(71, 84, 103, 0.38);

  --ui-selection-bg: rgba(37, 99, 235, 0.20);
  --ui-selection-text: #172554;

  /* Screen-level hierarchy */
  --ui-screen-shell-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.99) 0%, rgba(248, 250, 252, 0.99) 100%);
  --ui-screen-shell-border: rgba(15, 23, 42, 0.10);
  --ui-screen-shell-highlight: rgba(255, 255, 255, 0.82);
  --ui-screen-card-bg: rgba(255, 255, 255, 0.96);
  --ui-screen-card-border: rgba(15, 23, 42, 0.085);
  --ui-screen-toolbar-bg: rgba(15, 23, 42, 0.015);
  --ui-screen-accent-line: linear-gradient(90deg, transparent 0%, rgba(37, 99, 235, 0.64) 28%, rgba(14, 165, 233, 0.38) 72%, transparent 100%);
  --ui-screen-accent-glow: rgba(37, 99, 235, 0.045);
  --ui-screen-title-bg: rgba(255, 255, 255, 0.94);
  --ui-screen-title-border: rgba(15, 23, 42, 0.085);
  --ui-screen-kpi-bg: rgba(37, 99, 235, 0.055);
  --ui-screen-kpi-border: rgba(37, 99, 235, 0.16);
}

/* ----------------------------------------------------------------------
   Conservative global polish
------------------------------------------------------------------------ */
html {
  font-family: var(--ui-font-sans);
  font-size: 15px;
  font-weight: var(--ui-font-weight-regular);
  line-height: var(--ui-leading-normal);
  background: var(--ui-bg-app);
  color: var(--ui-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-synthesis: none;
  scrollbar-color: var(--ui-scrollbar-thumb) var(--ui-scrollbar-track);
  scrollbar-width: thin;
}

body {
  background: var(--ui-bg-app);
  color: var(--ui-text);
  font-family: var(--ui-font-sans);
}

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

button,
input[type="button"],
input[type="submit"],
input[type="reset"],
select,
label[for],
a[href] {
  -webkit-tap-highlight-color: transparent;
}

#MainCanvas {
  color: var(--ui-text);
  font-family: var(--ui-font-sans);
}

#MainCanvas h1,
#MainCanvas h2,
#MainCanvas h3,
#MainCanvas h4,
#MainCanvas h5,
#MainCanvas h6 {
  font-family: var(--ui-font-sans);
  color: var(--ui-text-strong);
  font-weight: var(--ui-font-weight-semibold);
  letter-spacing: var(--ui-tracking-tight);
  text-wrap: balance;
}

#MainCanvas code,
#MainCanvas pre,
#MainCanvas kbd,
#MainCanvas samp {
  font-family: var(--ui-font-mono);
}

#MainCanvas a {
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  transition: color var(--ui-duration-fast) var(--ui-ease-standard);
}

#MainCanvas a:focus-visible,
#MainCanvas button:focus-visible,
#MainCanvas input:focus-visible,
#MainCanvas select:focus-visible,
#MainCanvas textarea:focus-visible,
.nav-bar a:focus-visible,
.nav-bar button:focus-visible {
  outline: 2px solid var(--ui-focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--ui-focus-ring);
}

#MainCanvas input,
#MainCanvas textarea,
#MainCanvas select {
  caret-color: var(--ui-focus);
  accent-color: var(--ui-accent);
}

#MainCanvas hr {
  border-color: var(--ui-divider);
}

::selection {
  background: var(--ui-selection-bg);
  color: var(--ui-selection-text);
  text-shadow: none;
}

::-moz-selection {
  background: var(--ui-selection-bg);
  color: var(--ui-selection-text);
  text-shadow: none;
}

*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

*::-webkit-scrollbar-track {
  background: var(--ui-scrollbar-track);
}

*::-webkit-scrollbar-thumb {
  min-height: 36px;
  border: 2px solid transparent;
  border-radius: var(--ui-radius-pill);
  background: var(--ui-scrollbar-thumb);
  background-clip: padding-box;
}

*::-webkit-scrollbar-thumb:hover {
  background: var(--ui-scrollbar-thumb-hover);
  background-clip: padding-box;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}