/* ============================================================
   Book & Notes Vault — Mobile-first stylesheet
   Breakpoints: 768px (tablet), 1024px (desktop)
   Theme variables: data-theme="light" / data-theme="dark"
   ============================================================ */

/* ---------- Theme tokens (light) ---------- */
:root[data-theme="light"] {
  --text-50: #ebe9fc;
  --text-100: #d7d2f9;
  --text-200: #afa6f2;
  --text-300: #8779ec;
  --text-400: #5e4ce6;
  --text-500: #3620df;
  --text-600: #2b19b3;
  --text-700: #211386;
  --text-800: #160d59;
  --text-900: #0b062d;
  --text-950: #050316;

  --background-50: #ebebfa;
  --background-100: #d6d6f5;
  --background-200: #adadeb;
  --background-300: #8585e0;
  --background-400: #5c5cd6;
  --background-500: #3333cc;
  --background-600: #2929a3;
  --background-700: #1f1f7a;
  --background-800: #141452;
  --background-900: #0a0a29;
  --background-950: #050514;

  --primary-50: #e7e5ff;
  --primary-100: #cfccff;
  --primary-200: #9e99ff;
  --primary-300: #6e66ff;
  --primary-400: #3d33ff;
  --primary-500: #0d00ff;
  --primary-600: #0a00cc;
  --primary-700: #080099;
  --primary-800: #050066;
  --primary-900: #030033;
  --primary-950: #01001a;

  --secondary-50: #e7e5ff;
  --secondary-100: #cfccff;
  --secondary-200: #9e99ff;
  --secondary-300: #6e66ff;
  --secondary-400: #3d33ff;
  --secondary-500: #0d00ff;
  --secondary-600: #0a00cc;
  --secondary-700: #080099;
  --secondary-800: #050066;
  --secondary-900: #030033;
  --secondary-950: #01001a;

  --accent-50: #e8e7fd;
  --accent-100: #d1cffc;
  --accent-200: #a49ff9;
  --accent-300: #766ff6;
  --accent-400: #483ff3;
  --accent-500: #1b0ff0;
  --accent-600: #150cc0;
  --accent-700: #100990;
  --accent-800: #0b0660;
  --accent-900: #050330;
  --accent-950: #030218;

  /* Semantic aliases */
  --bg:            var(--background-100);
  --card:          var(--background-50);
  --text-color:    var(--text-900);
  --muted:         var(--text-500);
  --accent-color:  var(--accent-500);
  --header-bg:     var(--background-900);
  --header-color:  var(--text-50);
  --border:        var(--background-200);
  --hover-bg:      var(--background-100);
  --table-head-bg: var(--primary-700);
  --tag-bg:        var(--primary-100);
  --tag-color:     var(--primary-800);
  --shadow:        0 6px 18px rgba(5,3,22,0.10);
  --nav-btn-color: var(--text-900);
  --nav-btn-focus: var(--background-100);
}

/* ---------- Theme tokens (dark) ---------- */
:root[data-theme="dark"] {
  --text-50: #050316;
  --text-100: #0a062d;
  --text-200: #140c5a;
  --text-300: #1e1287;
  --text-400: #2818b4;
  --text-500: #321fe0;
  --text-600: #5b4be7;
  --text-700: #8478ed;
  --text-800: #ada5f3;
  --text-900: #d6d2f9;
  --text-950: #eae9fc;

  --background-50: #050514;
  --background-100: #0a0a29;
  --background-200: #141452;
  --background-300: #1f1f7a;
  --background-400: #2929a3;
  --background-500: #3333cc;
  --background-600: #5c5cd6;
  --background-700: #8585e0;
  --background-800: #adadeb;
  --background-900: #d6d6f5;
  --background-950: #ebebfa;

  --primary-50: #01001a;
  --primary-100: #030033;
  --primary-200: #050066;
  --primary-300: #080099;
  --primary-400: #0a00cc;
  --primary-500: #0d00ff;
  --primary-600: #3d33ff;
  --primary-700: #6e66ff;
  --primary-800: #9e99ff;
  --primary-900: #cfccff;
  --primary-950: #e7e5ff;

  --secondary-50: #01001a;
  --secondary-100: #030033;
  --secondary-200: #050066;
  --secondary-300: #080099;
  --secondary-400: #0a00cc;
  --secondary-500: #0d00ff;
  --secondary-600: #3d33ff;
  --secondary-700: #6e66ff;
  --secondary-800: #9e99ff;
  --secondary-900: #cfccff;
  --secondary-950: #e7e5ff;

  --accent-50: #030218;
  --accent-100: #050330;
  --accent-200: #0b0660;
  --accent-300: #100990;
  --accent-400: #150cc0;
  --accent-500: #1b0ff0;
  --accent-600: #483ff3;
  --accent-700: #766ff6;
  --accent-800: #a49ff9;
  --accent-900: #d1cffc;
  --accent-950: #e8e7fd;

  /* Semantic aliases */
  --bg:            var(--background-100);
  --card:          var(--background-200);
  --text-color:    var(--text-900);
  --muted:         var(--text-700);
  --accent-color:  var(--accent-700);
  --header-bg:     var(--background-50);
  --header-color:  var(--text-950);
  --border:        var(--background-300);
  --hover-bg:      var(--background-300);
  --table-head-bg: var(--primary-300);
  --tag-bg:        var(--primary-200);
  --tag-color:     var(--primary-950);
  --shadow:        0 6px 18px rgba(0,0,0,0.40);
  --nav-btn-color: var(--text-950);
  --nav-btn-focus: var(--background-300);
}

/* ---------- Non-theme design tokens ---------- */
:root {
  --danger:  #ef4444;
  --radius:  12px;
}

/* ============================================================
   Reset & globals
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: "Poppins", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text-color);
  padding: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
  transition: background 0.2s ease, color 0.2s ease;
}

/* ============================================================
   Skip link
   ============================================================ */
.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  width: 1px; height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  left: 8px; top: 8px;
  width: auto; height: auto;
  padding: 8px 12px;
  background: var(--header-bg);
  color: var(--header-color);
  z-index: 9999;
  border-radius: 6px;
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 16px;
  background: var(--header-bg);
  color: var(--header-color);
  padding: 12px 14px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  position: relative;
}

/* Brand */
.brand { flex: 1; min-width: 0; }
.brand h1 {
  margin: 0;
  font-size: 1rem;
  color: var(--header-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand .tagline {
  margin: 2px 0 0;
  font-size: 0.78rem;
  color: var(--header-color);
  opacity: 0.75;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Header icon buttons (burger + theme toggle) */
.nav-toggle,
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.15);
  cursor: pointer;
  border-radius: 8px;
  padding: 6px;
  color: var(--header-color);
  flex-shrink: 0;
  transition: background 0.15s ease;
}
.nav-toggle:hover,
.theme-toggle:hover { background: rgba(255,255,255,0.10); }
.nav-toggle:focus-visible,
.theme-toggle:focus-visible { outline: 3px solid var(--accent-color); outline-offset: 2px; }

/* Hamburger icon */
.nav-toggle .hamburger {
  display: block;
  width: 22px; height: 2px;
  background: var(--header-color);
  position: relative;
  transition: background 0.18s ease;
}
.nav-toggle .hamburger::before,
.nav-toggle .hamburger::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  background: var(--header-color);
  transition: transform 0.18s ease, opacity 0.18s ease;
}
.nav-toggle .hamburger::before { top: -7px; }
.nav-toggle .hamburger::after  { top:  7px; }

/* Animate burger → X when open */
.nav-toggle[aria-expanded="true"] .hamburger { background: transparent; }
.nav-toggle[aria-expanded="true"] .hamburger::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger::after  { transform: translateY(-7px) rotate(-45deg); }

/* Theme icon */
.theme-icon { font-size: 1.1rem; line-height: 1; }

/* ============================================================
   Navigation (mobile-first: dropdown)
   ============================================================ */
.main-nav {
  position: absolute;
  left: 0; right: 0;
  top: calc(100% + 6px);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  z-index: 999;
  transition: opacity 0.18s ease, transform 0.18s ease;
}
.main-nav[hidden] {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px) scaleY(0.97);
}
.main-nav:not([hidden]) {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scaleY(1);
}

.main-nav button {
  background: transparent;
  border: none;
  text-align: left;
  padding: 10px 12px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--nav-btn-color);
  cursor: pointer;
  transition: background 0.12s ease;
}
.main-nav button:hover  { background: var(--nav-btn-focus); }
.main-nav button:focus-visible { outline: 3px solid var(--accent-color); outline-offset: 1px; }

/* ============================================================
   Main content wrapper
   ============================================================ */
main {
  max-width: 1100px;
  margin: 0 auto;
}

/* ============================================================
   Sections (cards)
   ============================================================ */
section {
  background: var(--card);
  padding: 16px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 16px;
  border: 1px solid var(--border);
  transition: transform 0.18s ease, background 0.2s ease;
}
section:focus-within { transform: translateY(-3px); }

section h2 {
  margin: 0 0 14px;
  font-size: 1.1rem;
  color: var(--text-color);
}

/* ============================================================
   Dashboard — metrics table
   ============================================================ */
.metrics-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 12px;
}
.metrics-table th,
.metrics-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 0.9rem;
}
.metrics-table thead th {
  background: var(--table-head-bg);
  color: #fff;
}
.highlight {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-color);
}

/* Inline tag list */
.inline-list {
  list-style: none;
  padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 6px;
}
.inline-list li {
  background: var(--tag-bg);
  color: var(--tag-color);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
}

/* Reading goal */
.cap-message {
  font-size: 0.85rem;
  margin-top: 6px;
  font-weight: 600;
}
.progress-wrap {
  width: 100%; height: 8px;
  background: var(--border);
  border-radius: 999px;
  margin-top: 8px;
  overflow: hidden;
}
.reading-progress {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-color), var(--primary-700));
  transition: width 0.3s ease;
}

/* Mini chart */
.mini-chart {
  height: 72px;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--background-200, #adadeb) 0%, var(--background-50, #ebebfa) 100%);
  margin-top: 12px;
}

/* ============================================================
   Records — search / sort controls
   ============================================================ */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 10px;
}
.controls label { font-size: 0.85rem; font-weight: 600; color: var(--text-color); }
.controls input[type="text"],
.controls select {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-color);
  font-family: inherit;
  font-size: 0.88rem;
  min-width: 0;
  flex: 1 1 140px;
}

/* Records table */
.table-wrap {
  overflow-x: auto;
  border-radius: 10px;
  border: 1px solid var(--border);
}
#records-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
#records-table th,
#records-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  white-space: nowrap;
}
#records-table thead th {
  background: var(--table-head-bg);
  color: #fff;
  position: sticky;
  top: 0;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}
#records-table tbody tr:hover { background: var(--hover-bg); }
.empty { text-align: center; color: var(--muted); padding: 24px; white-space: normal; }

/* Status badges */
.status-unread  { color: var(--text-color); background: var(--border); padding: 3px 8px; border-radius: 6px; font-size: 0.8rem; }
.status-reading { color: var(--primary-900); background: var(--primary-100); padding: 3px 8px; border-radius: 6px; font-size: 0.8rem; }
.status-done    { color: #065f46; background: #ecfdf5; padding: 3px 8px; border-radius: 6px; font-size: 0.8rem; }

/* ============================================================
   Form
   ============================================================ */
form { display: grid; gap: 12px; }
.row { display: flex; flex-direction: column; gap: 4px; }
.row label { font-size: 0.85rem; font-weight: 600; color: var(--text-color); }

input[type="text"],
input[type="number"],
input[type="date"],
select {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-color);
  font-family: inherit;
  font-size: 0.92rem;
  width: 100%;
}
input[type="text"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
select:focus {
  outline: 3px solid var(--accent-color);
  outline-offset: 1px;
  border-color: var(--accent-color);
}

small { font-size: 0.78rem; color: var(--muted); }

.form-actions { display: flex; gap: 8px; flex-wrap: wrap; }

#form-errors {
  color: var(--danger);
  font-weight: 600;
  font-size: 0.88rem;
  min-height: 1.2em;
}

/* ============================================================
   Buttons
   ============================================================ */
button {
  background: var(--accent-color);
  color: #fff;
  padding: 10px 16px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  transition: filter 0.15s ease, transform 0.1s ease;
}
button:hover  { filter: brightness(1.12); }
button:active { transform: scale(0.97); }
button:focus-visible { outline: 3px solid var(--accent-color); outline-offset: 3px; }
button[aria-pressed="true"] { filter: brightness(0.85); }

/* Danger button variant (delete) */
button.del {
  background: var(--danger);
  padding: 6px 10px;
  font-size: 0.8rem;
}
button.edit {
  background: var(--primary-600);
  padding: 6px 10px;
  font-size: 0.8rem;
}

/* ============================================================
   Settings — data management fieldset
   ============================================================ */
.data-management {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.data-management legend {
  padding: 0 6px;
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--text-color);
}

/* ============================================================
   Footer
   ============================================================ */
footer {
  background: var(--header-bg);
  color: var(--header-color);
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-top: 16px;
  font-size: 0.85rem;
  text-align: center;
}
footer a { color: var(--accent-color); }

/* ============================================================
   Focus & accessibility
   ============================================================ */
:focus { outline: none; }
:focus-visible { outline: 3px solid var(--accent-color); border-radius: 4px; }

/* ============================================================
   Tablet (≥ 768px)
   ============================================================ */
@media (min-width: 48rem) {
  body { padding: 20px; }

  .site-header { padding: 14px 20px; }
  .brand h1 { font-size: 1.15rem; }

  /* Hide burger, show nav inline */
  .nav-toggle { display: none; }
  .main-nav {
    position: static;
    display: flex !important;
    flex-direction: row;
    gap: 4px;
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
    opacity: 1 !important;
    transform: none !important;
    pointer-events: auto !important;
  }
  .main-nav button {
    color: var(--header-color);
    padding: 8px 12px;
    font-size: 0.85rem;
  }
  .main-nav button:hover { background: rgba(255,255,255,0.12); }

  .controls input[type="text"],
  .controls select { flex: unset; }
}

/* ============================================================
   Desktop (≥ 1024px)
   ============================================================ */
@media (min-width: 64rem) {
  body { padding: 32px; }
  main { max-width: 1200px; }
  .brand h1 { font-size: 1.25rem; }
  .site-header { padding: 18px 24px; }
  .controls { gap: 12px; }
  section { padding: 24px; }
}