/*
 * FlashFile Design2 semantic tokens. Light is the safe fallback.
 * Public dark mode is opt-in via the root attribute; admin stays Light.
 */
:root {
  color-scheme: light;

  /* Brand */
  --ff-brand-primary: #2855d9;
  --ff-brand-primary-hover: #2047bd;
  --ff-brand-primary-active: #193a9d;
  --ff-brand-accent: #7256d8;
  --ff-brand-gradient-start: #2855d9;
  --ff-brand-gradient-end: #7256d8;
  --ff-brand-cyan: #1685a7;

  /* Neutral surfaces and text */
  --ff-bg-page: #f7f8fc;
  --ff-bg-surface: #ffffff;
  --ff-bg-subtle: #f0f3f9;
  --ff-bg-elevated: #ffffff;
  --ff-text-primary: #172033;
  --ff-text-secondary: #49556b;
  --ff-text-muted: #657187;
  --ff-text-inverse: #ffffff;
  --ff-border: #d9dfeb;
  --ff-border-strong: #b7c1d3;

  /* Interaction */
  --ff-focus: #1746c8;
  --ff-focus-ring: 0 0 0 3px rgba(23, 70, 200, 0.24);
  --ff-link: #214fc8;
  --ff-link-hover: #173b9e;
  --ff-selection-bg: #dce6ff;

  /* Status: foreground, soft surface, and border */
  --ff-success: #13734b;
  --ff-success-bg: #e9f7f0;
  --ff-success-border: #9dd7bc;
  --ff-warning: #8a5800;
  --ff-warning-bg: #fff5dc;
  --ff-warning-border: #e7c873;
  --ff-danger: #b42335;
  --ff-danger-hover: #921d2c;
  --ff-danger-bg: #fff0f2;
  --ff-danger-border: #e7a9b1;
  --ff-info: #176487;
  --ff-info-bg: #eaf6fb;
  --ff-info-border: #9ccfe2;

  /* Product state */
  --ff-premium: #6747c7;
  --ff-premium-bg: #f1edff;
  --ff-vip: #8b5a08;
  --ff-vip-bg: #fff5dc;
  --ff-restricted: #a32d3c;
  --ff-restricted-bg: #fff0f2;
  --ff-trashed: #5d6879;
  --ff-trashed-bg: #edf0f4;
  --ff-processing: #176487;
  --ff-processing-bg: #eaf6fb;

  /* Uploader Level: one restrained blue-violet family */
  --ff-level-l1: #526176;
  --ff-level-l1-bg: #edf0f4;
  --ff-level-l2: #315d8c;
  --ff-level-l2-bg: #e9f2fb;
  --ff-level-l3: #4f55a8;
  --ff-level-l3-bg: #eeefff;
  --ff-level-l4: #6747a8;
  --ff-level-l4-bg: #f2edfb;

  /* System-first CJK typography */
  --ff-font-frontend: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", Arial, sans-serif;
  --ff-font-admin: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  --ff-font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --ff-font-weight-regular: 400;
  --ff-font-weight-medium: 500;
  --ff-font-weight-semibold: 600;
  --ff-font-weight-bold: 700;
  --ff-leading-tight: 1.25;
  --ff-leading-heading: 1.35;
  --ff-leading-body: 1.65;
  --ff-leading-compact: 1.45;
  --ff-tracking-tight: -0.02em;
  --ff-tracking-normal: 0;
  --ff-tracking-label: 0.01em;

  /* Fluid public headings remain CJK-safe and modest */
  --ff-type-display-size: clamp(2.25rem, 1.55rem + 2.5vw, 4rem);
  --ff-type-display-line: 1.12;
  --ff-type-h1-size: clamp(1.875rem, 1.55rem + 1vw, 2.5rem);
  --ff-type-h2-size: clamp(1.5rem, 1.35rem + 0.6vw, 2rem);
  --ff-type-h3-size: 1.375rem;
  --ff-type-h4-size: 1.125rem;
  --ff-type-body-lg-size: 1.125rem;
  --ff-type-body-size: 1rem;
  --ff-type-body-sm-size: 0.875rem;
  --ff-type-caption-size: 0.75rem;
  --ff-type-label-size: 0.875rem;
  --ff-type-button-size: 0.9375rem;
  --ff-type-metric-lg-size: clamp(1.75rem, 1.55rem + 0.7vw, 2.25rem);
  --ff-type-metric-size: 1.25rem;
  --ff-type-mono-size: 0.875rem;

  /* 4px-derived spacing */
  --ff-space-1: 0.25rem;
  --ff-space-2: 0.5rem;
  --ff-space-3: 0.75rem;
  --ff-space-4: 1rem;
  --ff-space-5: 1.25rem;
  --ff-space-6: 1.5rem;
  --ff-space-8: 2rem;
  --ff-space-10: 2.5rem;
  --ff-space-12: 3rem;
  --ff-space-16: 4rem;
  --ff-space-20: 5rem;
  --ff-space-24: 6rem;

  /* Semantic spacing and density */
  --ff-page-gutter: clamp(1rem, 0.5rem + 2vw, 2rem);
  --ff-section-gap-public: clamp(3rem, 2rem + 3vw, 6rem);
  --ff-section-gap-app: 2.5rem;
  --ff-section-gap-admin: 1.5rem;
  --ff-card-padding-public: clamp(1.25rem, 1rem + 1vw, 2rem);
  --ff-card-padding-app: 1.25rem;
  --ff-card-padding-admin: 1rem;
  --ff-form-gap: 1rem;
  --ff-table-cell-y-comfortable: 0.875rem;
  --ff-table-cell-y-medium: 0.6875rem;
  --ff-table-cell-y-compact: 0.5rem;

  /* Shape, borders, elevation */
  --ff-radius-xs: 0.25rem;
  --ff-radius-sm: 0.375rem;
  --ff-radius-md: 0.625rem;
  --ff-radius-lg: 0.875rem;
  --ff-radius-pill: 999px;
  --ff-border-width: 1px;
  --ff-shadow-sm: 0 1px 2px rgba(23, 32, 51, 0.06);
  --ff-shadow-md: 0 8px 24px rgba(23, 32, 51, 0.09);
  --ff-shadow-lg: 0 18px 48px rgba(23, 32, 51, 0.14);

  /* Layout */
  --ff-public-max-width: 75rem;
  --ff-app-max-width: 90rem;
  --ff-account-sidebar-width: 16rem;
  --ff-admin-sidebar-width: 15rem;
  --ff-reading-max-width: 42rem;
  --ff-header-height: 4.25rem;

  /* Controls */
  --ff-control-height-sm: 2.25rem;
  --ff-control-height-md: 2.75rem;
  --ff-control-height-lg: 3.25rem;
  --ff-touch-target-min: 2.75rem;
  --ff-control-padding-x-sm: 0.75rem;
  --ff-control-padding-x-md: 1rem;
  --ff-control-padding-x-lg: 1.25rem;
  --ff-input-bg: var(--ff-bg-surface);
  --ff-input-border: var(--ff-border-strong);
  --ff-input-hover-border: #8f9bb0;
  --ff-input-focus-border: var(--ff-focus);
  --ff-input-disabled-bg: #edf0f4;
  --ff-input-readonly-bg: var(--ff-bg-subtle);

  /* Upload and progress */
  --ff-dropzone-bg: #fbfcff;
  --ff-dropzone-border: #9baad0;
  --ff-dropzone-drag-bg: #eef2ff;
  --ff-dropzone-drag-border: var(--ff-brand-primary);
  --ff-progress-track: #e3e7ef;
  --ff-progress-fill: linear-gradient(90deg, var(--ff-brand-gradient-start), var(--ff-brand-gradient-end));

  /* Motion */
  --ff-motion-fast: 120ms;
  --ff-motion-normal: 200ms;
  --ff-motion-slow: 320ms;
  --ff-ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --ff-ease-emphasized: cubic-bezier(0.2, 0, 0, 1.15);
}

@media (max-width: 47.99rem) {
  :root {
    --ff-section-gap-app: 2rem;
    --ff-section-gap-admin: 1.25rem;
    --ff-card-padding-app: 1rem;
    --ff-card-padding-admin: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --ff-motion-fast: 0ms;
    --ff-motion-normal: 0ms;
    --ff-motion-slow: 0ms;
  }
}

/* Public theme aliases: strong fills stay distinct from readable accent text. */
:root {
 --ff-sidebar-bg: #ffffff; --ff-header-bg: rgba(255,255,255,.98);
 --ff-button-neutral: var(--ff-bg-surface); --ff-divider: var(--ff-border);
 --ff-accent-text: var(--ff-brand-primary); --ff-accent-secondary: var(--ff-brand-accent);
 --ff-danger-solid: #b42335; --ff-overlay: rgba(23,32,51,.48);
}
html[data-theme="dark"] {
 color-scheme: dark;
 --ff-bg-page: #101724; --ff-bg-surface: #182234; --ff-bg-subtle: #202d43; --ff-bg-elevated: #1e2b40;
 --ff-sidebar-bg: #131d2d; --ff-header-bg: #182234;
 --ff-text-primary: #e6ecf5; --ff-text-secondary: #bfccdf; --ff-text-muted: #9facbf;
 --ff-border: #35445c; --ff-border-strong: #7185a2;
 --ff-brand-primary: #335cd6; --ff-brand-primary-hover: #294dbb; --ff-brand-primary-active: #2343a5;
 --ff-accent-text: #a6bcff; --ff-accent-secondary: #c4b5ff;
 --ff-link: #a6bcff; --ff-link-hover: #cedaff; --ff-selection-bg: #2b3e65;
 --ff-focus: #b5c8ff; --ff-focus-ring: 0 0 0 3px rgba(181,200,255,.4);
 --ff-success: #8bdfb5; --ff-success-bg: #18392f; --ff-success-border: #3d7860;
 --ff-warning: #f1ce82; --ff-warning-bg: #3a3020; --ff-warning-border: #846d3c;
 --ff-danger: #ffb1bd; --ff-danger-bg: #402732; --ff-danger-border: #966071;
 --ff-danger-solid: #b9364a; --ff-danger-hover: #a72d40;
 --ff-info: #9cd9f4; --ff-info-bg: #193548; --ff-info-border: #47748b;
 --ff-premium: #cbbaff; --ff-premium-bg: #302b4e; --ff-vip: #f1ce82; --ff-vip-bg: #3a3020;
 --ff-restricted: var(--ff-danger); --ff-restricted-bg: var(--ff-danger-bg);
 --ff-trashed: #bfccdf; --ff-trashed-bg: #293447; --ff-processing: var(--ff-info); --ff-processing-bg: var(--ff-info-bg);
 --ff-level-l1: #bfccdf; --ff-level-l1-bg: #293447; --ff-level-l2: #afd5f7; --ff-level-l2-bg: #21374c;
 --ff-level-l3: #c0c4ff; --ff-level-l3-bg: #2c3052; --ff-level-l4: #d2bbf5; --ff-level-l4-bg: #382d4c;
 --ff-input-hover-border: #9facbf; --ff-input-disabled-bg: #283345;
 --ff-dropzone-bg: #1b2940; --ff-dropzone-border: #7185a2; --ff-dropzone-drag-bg: #2b3e65;
 --ff-progress-track: #35445c; --ff-overlay: rgba(5,10,20,.62);
 --ff-shadow-sm: 0 1px 2px rgba(0,0,0,.2); --ff-shadow-md: 0 8px 24px rgba(0,0,0,.25); --ff-shadow-lg: 0 18px 48px rgba(0,0,0,.35);
}