/* ==========================================================================
   Design tokens
   Warm & encouraging, calm & focused. A study-room, not a dashboard.
   ========================================================================== */

:root {
  /* Color */
  --color-bg: #F6F1E4;
  --color-bg-card: #FFFDF8;
  --color-bg-card-raised: #FFFFFF;
  --color-ink: #2B2621;
  --color-ink-soft: #6B6355;
  --color-ink-faint: #A69C88;

  --color-primary: #4B7566;
  --color-primary-dark: #35564A;
  --color-primary-soft: #E4ECE7;

  --color-accent: #E8A33D;
  --color-accent-dark: #8A5D1B;
  --color-accent-soft: #FBEAD1;

  --color-error: #C1554A;
  --color-error-soft: #F6E2DF;

  --color-border: #E3DBC8;
  --color-border-strong: #D4C9AE;

  /* Type */
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Karla', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  /* Scale — kept modest so the page reads calm, not shouty */
  --step--1: clamp(0.83rem, 0.8rem + 0.15vw, 0.9rem);
  --step-0: clamp(1rem, 0.95rem + 0.2vw, 1.06rem);
  --step-1: clamp(1.15rem, 1.1rem + 0.3vw, 1.25rem);
  --step-2: clamp(1.35rem, 1.25rem + 0.5vw, 1.55rem);
  --step-3: clamp(1.7rem, 1.5rem + 0.8vw, 2.05rem);
  --step-4: clamp(2rem, 1.7rem + 1.4vw, 2.65rem);

  /* Layout */
  --content-width: 720px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-card: 0 1px 2px rgba(43, 38, 33, 0.04), 0 8px 24px -8px rgba(43, 38, 33, 0.10);
  --shadow-card-hover: 0 2px 4px rgba(43, 38, 33, 0.05), 0 16px 32px -12px rgba(43, 38, 33, 0.14);

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   Reset
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  color-scheme: light;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.55;
  color: var(--color-ink);
  background: var(--color-bg);
  background-image:
    radial-gradient(circle at 1px 1px, rgba(43,38,33,0.035) 1px, transparent 0);
  background-size: 22px 22px;
  min-height: 100svh;
}

img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }

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

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--color-ink);
}

h1 { font-size: var(--step-4); font-weight: 500; }
h2 { font-size: var(--step-2); }
h3 { font-size: var(--step-1); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
}

.text-soft { color: var(--color-ink-soft); }
.text-faint { color: var(--color-ink-faint); }

/* ==========================================================================
   Layout shell
   ========================================================================== */

.page {
  display: flex;
  flex-direction: column;
  min-height: 100svh;
}

.container {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: 24px;
}

.site-header {
  padding-block: 22px;
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.site-nav-divider {
  width: 1px;
  height: 16px;
  background: var(--color-border);
}

.auth-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-user {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: color 0.15s var(--ease);
}

.nav-user:hover,
.nav-user:focus-visible { color: var(--color-primary-dark); }

.nav-logout-form { display: inline-flex; }

.link-quiet {
  font-weight: 700;
  font-size: var(--step--1);
  text-decoration: none;
  color: var(--color-ink-soft);
  padding: 13px 6px;
  border-bottom: 1.5px solid var(--color-border-strong);
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}

.link-quiet:hover,
.link-quiet:focus-visible { color: var(--color-primary-dark); border-color: var(--color-primary); }

/* Django messages framework output */
.page-message {
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: var(--step--1);
  font-weight: 600;
  margin-top: 20px;
}

.page-message-success {
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.page-message-error { background: var(--color-error-soft); color: var(--color-error); }
.page-message-warning { background: var(--color-accent-soft); color: var(--color-accent-dark); }
.page-message-info { background: var(--color-border); color: var(--color-ink-soft); }

button.link-quiet {
  appearance: none;
  -webkit-appearance: none;
  background: none;
  border: none;
  border-bottom: 1.5px solid var(--color-border-strong);
  cursor: pointer;
  font: inherit;
  padding: 13px 6px;
}

button.link-quiet:hover,
button.link-quiet:focus-visible {
  color: var(--color-primary-dark);
  border-color: var(--color-primary);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 600;
  text-decoration: none;
  color: var(--color-ink);
}

.wordmark-mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: var(--color-primary);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.wordmark-mark svg { width: 15px; height: 15px; }

.site-nav {
  display: flex;
  gap: 24px;
  font-size: var(--step--1);
}

.site-nav a {
  text-decoration: none;
  color: var(--color-ink-soft);
  transition: color 0.15s var(--ease);
}

.site-nav a:hover,
.site-nav a:focus-visible { color: var(--color-primary-dark); }

.site-nav a.is-active { color: var(--color-ink); font-weight: 600; }

.nav-soon {
  position: relative;
  color: var(--color-ink-faint) !important;
  cursor: not-allowed;
  pointer-events: none;
}

.nav-soon::after {
  content: "soon";
  margin-left: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--color-ink-faint);
  background: var(--color-primary-soft);
  padding: 2px 6px;
  border-radius: 5px;
  vertical-align: middle;
}

main {
  flex: 1;
  padding-block: 40px 56px;
}

/* ==========================================================================
   Signature element: the highlighter stroke
   Used to underline the key word in a headline, and reused as the
   quiz progress fill so the same gesture threads through the app.
   ========================================================================== */

.highlight {
  position: relative;
  white-space: nowrap;
}

.highlight svg {
  position: absolute;
  left: -2%;
  right: -2%;
  bottom: 0.02em;
  width: 104%;
  height: 0.5em;
  z-index: -1;
  color: var(--color-accent);
}

/* ==========================================================================
   Card
   ========================================================================== */

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  --btn-fg: var(--color-bg-card);
  --btn-bg: var(--color-primary);
  --btn-bg-hover: var(--color-primary-dark);

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--step-0);
  padding: 13px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: var(--btn-bg);
  color: var(--btn-fg);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s var(--ease), transform 0.15s var(--ease), box-shadow 0.15s var(--ease);
}

.btn:hover { background: var(--btn-bg-hover); }
.btn:active { transform: translateY(1px); }

.btn:disabled {
  background: var(--color-border-strong);
  color: var(--color-ink-faint);
  cursor: not-allowed;
}

.btn-block { width: 100%; }

.btn-ghost {
  --btn-bg: transparent;
  --btn-bg-hover: var(--color-primary-soft);
  --btn-fg: var(--color-primary-dark);
  border-color: var(--color-border-strong);
}

.btn-ghost:hover { border-color: var(--color-primary); }

.btn-danger {
  --btn-bg: var(--color-error);
  --btn-bg-hover: #A6483F;
}

.btn-ghost-danger {
  --btn-bg: transparent;
  --btn-bg-hover: var(--color-error-soft);
  --btn-fg: var(--color-error);
  border-color: var(--color-border-strong);
}

.btn-ghost-danger:hover { border-color: var(--color-error); }

.btn-sm {
  padding: 9px 16px;
  font-size: var(--step--1);
}

.btn svg { width: 18px; height: 18px; }

/* Visible keyboard focus, everywhere */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ==========================================================================
   Form elements
   ========================================================================== */

.field { display: flex; flex-direction: column; gap: 8px; }

.field-label {
  font-size: var(--step--1);
  font-weight: 700;
  color: var(--color-ink);
}

.select-wrap { position: relative; max-width: 220px; }

.select {
  appearance: none;
  width: 100%;
  background: var(--color-bg-card-raised);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  padding: 11px 40px 11px 14px;
  font-size: var(--step-0);
  font-weight: 600;
  cursor: pointer;
}

.select-wrap::after {
  content: "";
  position: absolute;
  right: 14px;
  top: 50%;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--color-ink-soft);
  border-bottom: 2px solid var(--color-ink-soft);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

/* Segmented control (difficulty picker) */
.segmented {
  display: inline-flex;
  padding: 4px;
  background: var(--color-primary-soft);
  border-radius: var(--radius-md);
  gap: 4px;
}

.segmented input { position: absolute; opacity: 0; pointer-events: none; }

.segmented label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 10px;
  font-size: var(--step--1);
  font-weight: 700;
  color: var(--color-primary-dark);
  cursor: pointer;
  transition: background 0.15s var(--ease), color 0.15s var(--ease), box-shadow 0.15s var(--ease);
}

.segmented input:checked + label {
  background: var(--color-bg-card-raised);
  color: var(--color-ink);
  box-shadow: 0 1px 2px rgba(43,38,33,0.08), 0 4px 10px -4px rgba(43,38,33,0.15);
}

.segmented input:focus-visible + label {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}
.dot-easy { background: #7FAF8E; }
.dot-medium { background: var(--color-accent); }
.dot-hard { background: var(--color-error); }

/* Icon-only round button (edit/delete affordances) */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  border: 1px solid var(--color-border-strong);
  background: var(--color-bg-card-raised);
  color: var(--color-ink-soft);
  cursor: pointer;
  text-decoration: none;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease), background 0.15s var(--ease);
}

.icon-btn svg { width: 15px; height: 15px; }

.icon-btn:hover { color: var(--color-primary-dark); border-color: var(--color-primary); }

.icon-btn.icon-btn-danger:hover {
  color: var(--color-error);
  border-color: var(--color-error);
  background: var(--color-error-soft);
}

/* Non-field error banner (shared across auth + other forms) */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--color-error-soft);
  color: var(--color-error);
  font-size: var(--step--1);
  font-weight: 600;
  margin-bottom: 22px;
  text-align: left;
}

.alert svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 1px; }

/* Small pill badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  white-space: nowrap;
}

/* ==========================================================================
   Utility
   ========================================================================== */

.stack { display: flex; flex-direction: column; }
.gap-xs { gap: 8px; }
.gap-sm { gap: 12px; }
.gap-md { gap: 20px; }
.gap-lg { gap: 32px; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}