/**
 * Hippocampus theme for the Django pages: the Next.js frontend's tokens
 * (frontend/src/app/globals.css, frontend/DESIGN.md) mapped onto the variable names
 * components.css uses and onto Bootstrap's. Keep the colours in step with globals.css.
 *
 * Theme: <html data-theme="light|dark"> from the `hc-theme` cookie (base.html);
 * without it, the OS preference decides. base.html also sets data-bs-theme for
 * Bootstrap's own dark styles.
 */

:root {
  color-scheme: light;
  --color-primary: #2b4a7e;
  --color-primary-dark: #213a63;
  --color-primary-light: #2b4a7e;
  --color-primary-lighter: #e0e8f4;
  --color-primary-lightest: #e0e8f4;
  --color-secondary: #566072;
  --color-secondary-dark: #1b2230;
  --color-secondary-light: #c2cad6;
  --color-secondary-lighter: #dce1e8;
  --color-secondary-lightest: #eceff3;
  --color-accent: #8f6211;
  --color-accent-light: #f5ecd6;
  --color-success: #2c7650;
  --color-success-light: #2c7650;
  --color-success-bg: #ddefe4;
  --color-warning: #94600a;
  --color-warning-light: #94600a;
  --color-warning-bg: #f8ecd2;
  --color-danger: #b03a2e;
  --color-danger-light: #b03a2e;
  --color-danger-bg: #f8e2df;
  --color-info: #2b4a7e;
  --color-info-light: #2b4a7e;
  --color-info-bg: #e0e8f4;
  --color-text-primary: #1b2230;
  --color-text-secondary: #566072;
  --color-text-muted: #566072;
  --color-text-light: #566072;
  --color-text-inverse: #ffffff;
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f5f6f8;
  --color-bg-tertiary: #eceff3;
  --color-bg-hover: #eceff3;
  --color-bg-active: #e0e8f4;
  --color-border: #dce1e8;
  --color-border-light: #dce1e8;
  --color-border-dark: #c2cad6;
  --color-border-focus: #2b4a7e;
  /* Bootstrap 5.3 */
  --bs-body-bg: #f5f6f8;
  --bs-body-color: #1b2230;
  --bs-emphasis-color: #1b2230;
  --bs-secondary-color: #566072;
  --bs-tertiary-color: #566072;
  --bs-secondary-bg: #eceff3;
  --bs-tertiary-bg: #eceff3;
  --bs-border-color: #dce1e8;
  --bs-primary: #2b4a7e;
  --bs-primary-rgb: 43, 74, 126;
  --bs-link-color: #2b4a7e;
  --bs-link-color-rgb: 43, 74, 126;
  --bs-link-hover-color: #213a63;
  --bs-focus-ring-color: rgba(43, 74, 126, 0.35);
  --modal-backdrop-bg: rgba(10, 14, 22, 0.55);

  /* ============================================
     TYPOGRAPHY
     ============================================ */

  --font-family-base: "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-heading: "Literata", Georgia, serif;
  --font-family-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;

  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 1.875rem;    /* 30px */
  --font-size-4xl: 2.25rem;     /* 36px */
  --font-size-5xl: 3rem;        /* 48px */

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* ============================================
     SPACING SCALE
     ============================================ */

  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */

  /* ============================================
     BORDERS & RADIUS
     ============================================ */

  --border-width: 1px;
  --border-width-thick: 2px;
  --border-style: solid;

  --border-radius-none: 0;
  --border-radius-sm: 0.25rem;   /* 4px */
  --border-radius-md: 0.375rem;  /* 6px */
  --border-radius-lg: 0.5rem;    /* 8px */
  --border-radius-xl: 0.75rem;   /* 12px */
  --border-radius-2xl: 1rem;     /* 16px */
  --border-radius-full: 9999px;

  /* ============================================
     SHADOWS
     ============================================ */

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  --shadow-none: none;

  /* ============================================
     TRANSITIONS
     ============================================ */

  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;

  /* ============================================
     Z-INDEX SCALE
     ============================================ */

  --z-index-dropdown: 1000;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal-backdrop: 1040;
  --z-index-modal: 1050;
  --z-index-popover: 1060;
  --z-index-tooltip: 1070;

  /* ============================================
     LAYOUT
     ============================================ */

  --container-max-width: 1200px;
  --container-padding: var(--spacing-4);

  /* ============================================
     COMPONENT-SPECIFIC
     ============================================ */

  /* Buttons */
  --btn-padding-y: 0.625rem;
  --btn-padding-x: 1.25rem;
  --btn-font-size: var(--font-size-base);
  --btn-font-weight: var(--font-weight-medium);
  --btn-border-radius: var(--border-radius-lg);

  /* Cards */
  --card-padding: var(--spacing-6);
  --card-border-radius: var(--border-radius-xl);
  --card-shadow: var(--shadow-md);
  --card-bg: var(--color-bg-primary);

  /* Forms */
  --form-input-padding-y: 0.625rem;
  --form-input-padding-x: 0.875rem;
  --form-input-border-radius: var(--border-radius-lg);
  --form-input-border: var(--border-width) var(--border-style) var(--color-border);
  --form-input-focus-border: var(--border-width-thick) var(--border-style) var(--color-border-focus);

  /* Modals */
  --modal-backdrop-bg: rgba(15, 23, 42, 0.75);
  --modal-border-radius: var(--border-radius-xl);
  --modal-shadow: var(--shadow-xl);

  --shadow-md: 0 1px 2px rgba(20, 28, 45, 0.06), 0 4px 16px rgba(20, 28, 45, 0.06);
  --card-shadow: var(--shadow-md);
  --card-border-radius: 0.875rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --color-primary: #8fb0e6;
    --color-primary-dark: #adc5ee;
    --color-primary-light: #8fb0e6;
    --color-primary-lighter: #1e2c44;
    --color-primary-lightest: #1e2c44;
    --color-secondary: #9ca7b8;
    --color-secondary-dark: #e3e8f0;
    --color-secondary-light: #3b4658;
    --color-secondary-lighter: #2a3342;
    --color-secondary-lightest: #1d2531;
    --color-accent: #e0b05a;
    --color-accent-light: #382c17;
    --color-success: #71c99a;
    --color-success-light: #71c99a;
    --color-success-bg: #183026;
    --color-warning: #ecb862;
    --color-warning-light: #ecb862;
    --color-warning-bg: #382c17;
    --color-danger: #ee8f84;
    --color-danger-light: #ee8f84;
    --color-danger-bg: #3b1f1c;
    --color-info: #8fb0e6;
    --color-info-light: #8fb0e6;
    --color-info-bg: #1e2c44;
    --color-text-primary: #e3e8f0;
    --color-text-secondary: #9ca7b8;
    --color-text-muted: #9ca7b8;
    --color-text-light: #9ca7b8;
    --color-text-inverse: #0d1626;
    --color-bg-primary: #171d27;
    --color-bg-secondary: #10141b;
    --color-bg-tertiary: #1d2531;
    --color-bg-hover: #1d2531;
    --color-bg-active: #1e2c44;
    --color-border: #2a3342;
    --color-border-light: #2a3342;
    --color-border-dark: #3b4658;
    --color-border-focus: #8fb0e6;
    /* Bootstrap 5.3 */
    --bs-body-bg: #10141b;
    --bs-body-color: #e3e8f0;
    --bs-emphasis-color: #e3e8f0;
    --bs-secondary-color: #9ca7b8;
    --bs-tertiary-color: #9ca7b8;
    --bs-secondary-bg: #1d2531;
    --bs-tertiary-bg: #1d2531;
    --bs-border-color: #2a3342;
    --bs-primary: #8fb0e6;
    --bs-primary-rgb: 143, 176, 230;
    --bs-link-color: #8fb0e6;
    --bs-link-color-rgb: 143, 176, 230;
    --bs-link-hover-color: #adc5ee;
    --bs-focus-ring-color: rgba(143, 176, 230, 0.35);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --color-primary: #8fb0e6;
  --color-primary-dark: #adc5ee;
  --color-primary-light: #8fb0e6;
  --color-primary-lighter: #1e2c44;
  --color-primary-lightest: #1e2c44;
  --color-secondary: #9ca7b8;
  --color-secondary-dark: #e3e8f0;
  --color-secondary-light: #3b4658;
  --color-secondary-lighter: #2a3342;
  --color-secondary-lightest: #1d2531;
  --color-accent: #e0b05a;
  --color-accent-light: #382c17;
  --color-success: #71c99a;
  --color-success-light: #71c99a;
  --color-success-bg: #183026;
  --color-warning: #ecb862;
  --color-warning-light: #ecb862;
  --color-warning-bg: #382c17;
  --color-danger: #ee8f84;
  --color-danger-light: #ee8f84;
  --color-danger-bg: #3b1f1c;
  --color-info: #8fb0e6;
  --color-info-light: #8fb0e6;
  --color-info-bg: #1e2c44;
  --color-text-primary: #e3e8f0;
  --color-text-secondary: #9ca7b8;
  --color-text-muted: #9ca7b8;
  --color-text-light: #9ca7b8;
  --color-text-inverse: #0d1626;
  --color-bg-primary: #171d27;
  --color-bg-secondary: #10141b;
  --color-bg-tertiary: #1d2531;
  --color-bg-hover: #1d2531;
  --color-bg-active: #1e2c44;
  --color-border: #2a3342;
  --color-border-light: #2a3342;
  --color-border-dark: #3b4658;
  --color-border-focus: #8fb0e6;
  /* Bootstrap 5.3 */
  --bs-body-bg: #10141b;
  --bs-body-color: #e3e8f0;
  --bs-emphasis-color: #e3e8f0;
  --bs-secondary-color: #9ca7b8;
  --bs-tertiary-color: #9ca7b8;
  --bs-secondary-bg: #1d2531;
  --bs-tertiary-bg: #1d2531;
  --bs-border-color: #2a3342;
  --bs-primary: #8fb0e6;
  --bs-primary-rgb: 143, 176, 230;
  --bs-link-color: #8fb0e6;
  --bs-link-color-rgb: 143, 176, 230;
  --bs-link-hover-color: #adc5ee;
  --bs-focus-ring-color: rgba(143, 176, 230, 0.35);
}

/* ============================================
   GLOBAL STYLES
   ============================================ */

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Focus styles for accessibility */
*:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* Selection styles */
::selection {
  background-color: var(--color-primary-lightest);
  color: var(--color-primary-dark);
}

/* ============================================
   HIPPOCAMPUS OVERRIDES
   ============================================ */

h1, h2, h3 {
  font-family: var(--font-family-heading);
  letter-spacing: -0.01em;
}

.bg-light,
.bg-white {
  background-color: var(--color-bg-tertiary) !important;
}

.card,
.modal-content,
.dropdown-menu {
  background-color: var(--color-bg-primary);
  border-color: var(--color-border);
}

/* The logo is black line art. */
[data-bs-theme="dark"] .hc-logo {
  filter: invert(1);
}

.navbar {
  background-color: color-mix(in srgb, var(--color-bg-secondary) 85%, transparent);
  backdrop-filter: blur(8px);
}

.navbar .nav-link {
  white-space: nowrap;
  border-radius: var(--border-radius-lg);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

.navbar .nav-link:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-text-primary);
}