/* ============================================================
   INF.03.4 – Projektowanie i administrowanie bazami danych
   Wspólny arkusz stylów
   ============================================================ */

:root {
  --primary:       #1565c0;
  --primary-dark:  #003c8f;
  --primary-light: #e3f2fd;
  --secondary:     #00897b;
  --accent:        #f57f17;
  --bg:            #f0f4f8;
  --bg-card:       #ffffff;
  --text:          #1a1a2e;
  --text-light:    #5a6a7a;
  --border:        #d0dce8;
  --success:       #2e7d32;
  --success-bg:    #e8f5e9;
  --error:         #c62828;
  --error-bg:      #ffebee;
  --warning:       #e65100;
  --warning-bg:    #fff3e0;
  --code-bg:       #1e1e2e;
  --code-text:     #cdd6f4;
  --code-kw:       #89b4fa;
  --code-str:      #a6e3a1;
  --code-num:      #fab387;
  --radius:        10px;
  --shadow:        0 2px 12px rgba(21,101,192,.12);
  --shadow-hover:  0 6px 24px rgba(21,101,192,.22);
  --transition:    .2s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
}

/* ── Typography ── */
h1 { font-size: 1.9rem; font-weight: 700; line-height: 1.25; }
h2 { font-size: 1.4rem; font-weight: 700; margin-bottom: .6rem; }
h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: .4rem; }
h4 { font-size: 1rem; font-weight: 600; margin-bottom: .3rem; }

p  { margin-bottom: .9rem; }
ul, ol { margin-bottom: .9rem; padding-left: 1.6rem; }
li { margin-bottom: .25rem; }
strong { color: var(--primary-dark); }

/* ── Top header ── */
.site-header {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: #fff;
  padding: 0 1.5rem;
  display: flex;
  align-items: stretch;
  gap: 1rem;
  box-shadow: 0 2px 8px rgba(0,0,0,.25);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .brand {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .05em;
  text-transform: uppercase;
  opacity: .75;
  padding: .55rem 0;
  white-space: nowrap;
}

.site-header h1 {
  font-size: 1.1rem;
  font-weight: 700;
  flex: 1;
  padding: .55rem 0;
  line-height: 1.3;
}

.header-meta {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .4rem 0;
  flex-shrink: 0;
}

.lesson-badge {
  background: rgba(255,255,255,.2);
  border: 1px solid rgba(255,255,255,.35);
  color: #fff;
  font-size: .75rem;
  font-weight: 700;
  padding: .25rem .7rem;
  border-radius: 20px;
  white-space: nowrap;
}

.block-badge {
  background: var(--accent);
  color: #fff;
  font-size: .7rem;
  font-weight: 700;
  padding: .25rem .65rem;
  border-radius: 20px;
  white-space: nowrap;
}

.timer-badge {
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.3);
  color: #fff;
  font-size: .75rem;
  padding: .25rem .65rem;
  border-radius: 20px;
  display: flex;
  align-items: center;
  gap: .3rem;
}

/* ── Progress bar ── */
.lesson-progress {
  background: rgba(0,0,0,.2);
  height: 4px;
}
.lesson-progress-bar {
  background: var(--accent);
  height: 4px;
  transition: width .4s ease;
}

/* ── Main layout ── */
.lesson-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.2rem 4rem;
}

/* ── Sections ── */
.lesson-objectives {
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.3rem;
  margin-bottom: 2rem;
}
.lesson-objectives h2 { color: var(--primary-dark); font-size: 1rem; margin-bottom: .5rem; }
.lesson-objectives ul { margin: 0; }
.lesson-objectives li { font-size: .93rem; }

/* ── Card ── */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.6rem;
  margin-bottom: 1.6rem;
}
.card:hover { box-shadow: var(--shadow-hover); }

.card-header {
  display: flex;
  align-items: center;
  gap: .7rem;
  margin-bottom: 1.1rem;
  padding-bottom: .8rem;
  border-bottom: 2px solid var(--border);
}
.card-header .icon {
  font-size: 1.4rem;
  width: 2.2rem;
  height: 2.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: 8px;
  flex-shrink: 0;
}
.card-header h2 { margin: 0; font-size: 1.2rem; color: var(--primary-dark); }

/* ── Theory elements ── */
.definition-box {
  border: 1px solid var(--border);
  border-left: 4px solid var(--secondary);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: .9rem 1.1rem;
  margin: .9rem 0;
  background: #f0faf8;
}
.definition-box strong { color: var(--secondary); }

.info-box {
  background: #e8f4fd;
  border: 1px solid #90caf9;
  border-radius: var(--radius);
  padding: .85rem 1.1rem;
  margin: .9rem 0;
  font-size: .93rem;
}
.info-box::before { content: "ℹ️  "; }

.warning-box {
  background: var(--warning-bg);
  border: 1px solid #ffcc80;
  border-radius: var(--radius);
  padding: .85rem 1.1rem;
  margin: .9rem 0;
  font-size: .93rem;
}
.warning-box::before { content: "⚠️  "; }

.tip-box {
  background: #f3e5f5;
  border: 1px solid #ce93d8;
  border-radius: var(--radius);
  padding: .85rem 1.1rem;
  margin: .9rem 0;
  font-size: .93rem;
}
.tip-box::before { content: "💡  "; }

/* ── Code blocks ── */
pre, code {
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: .88rem;
}
pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 1.1rem 1.3rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: .9rem 0;
  line-height: 1.6;
  position: relative;
}
pre .kw  { color: var(--code-kw); font-weight: 600; }
pre .str { color: var(--code-str); }
pre .num { color: var(--code-num); }
pre .cmt { color: #6272a4; font-style: italic; }
pre .fn  { color: #ffb86c; }
pre .tbl { color: #f8f8f2; font-weight: 600; }
code {
  background: #eef2ff;
  color: var(--primary-dark);
  padding: .1rem .4rem;
  border-radius: 4px;
  font-size: .85em;
}
pre code { background: none; color: inherit; padding: 0; border-radius: 0; }

/* ── Tables ── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
  margin: .9rem 0;
}
.data-table th {
  background: var(--primary);
  color: #fff;
  padding: .6rem .9rem;
  text-align: left;
  font-weight: 600;
}
.data-table td {
  padding: .55rem .9rem;
  border-bottom: 1px solid var(--border);
}
.data-table tr:nth-child(even) td { background: var(--bg); }
.data-table tr:hover td { background: var(--primary-light); }

/* ── Exercise cards ── */
.exercise-card {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  margin-bottom: 1.4rem;
  transition: border-color var(--transition);
}
.exercise-card.active { border-color: var(--primary); }
.exercise-card.solved { border-color: var(--success); }

.exercise-header {
  display: flex;
  align-items: flex-start;
  gap: .7rem;
  margin-bottom: 1rem;
}
.exercise-num {
  background: var(--primary);
  color: #fff;
  font-size: .75rem;
  font-weight: 700;
  padding: .2rem .6rem;
  border-radius: 20px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: .1rem;
}
.exercise-title { font-weight: 600; font-size: 1rem; }

/* ── Quiz ── */
.quiz-options { list-style: none; padding: 0; margin: .8rem 0; }
.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: .6rem;
  padding: .7rem .9rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: .45rem;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}
.quiz-option:hover { background: var(--primary-light); border-color: var(--primary); }
.quiz-option input[type="radio"],
.quiz-option input[type="checkbox"] {
  margin-top: .15rem;
  accent-color: var(--primary);
  flex-shrink: 0;
}
.quiz-option.correct-ans { background: var(--success-bg); border-color: var(--success); }
.quiz-option.wrong-ans   { background: var(--error-bg);   border-color: var(--error); }

/* ── Feedback ── */
.feedback {
  padding: .65rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: .9rem;
  margin-top: .6rem;
  display: none;
}
.feedback.show { display: block; }
.feedback.correct  { background: var(--success-bg); color: var(--success); border: 1px solid #a5d6a7; }
.feedback.incorrect { background: var(--error-bg);  color: var(--error);   border: 1px solid #ef9a9a; }
.feedback.info     { background: #e3f2fd; color: var(--primary-dark); border: 1px solid #90caf9; }

/* ── SQL editor ── */
.sql-editor-wrap {
  position: relative;
  margin: .7rem 0;
}
.sql-editor {
  width: 100%;
  min-height: 100px;
  background: var(--code-bg);
  color: var(--code-text);
  border: 2px solid #3a3a5c;
  border-radius: var(--radius);
  padding: .9rem 1rem;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: .88rem;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition);
}
.sql-editor:focus { border-color: var(--primary); }

.result-table-wrap {
  overflow-x: auto;
  margin-top: .6rem;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .55rem 1.3rem;
  border: none;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  text-decoration: none;
}
.btn:hover   { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,0,0,.18); }
.btn:active  { transform: translateY(0); }

.btn-primary  { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }

.btn-secondary { background: var(--secondary); color: #fff; }
.btn-secondary:hover { background: #00695c; }

.btn-accent   { background: var(--accent); color: #fff; }
.btn-outline  { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary-light); }

.btn-sm { padding: .35rem .85rem; font-size: .82rem; }
.btn-lg { padding: .75rem 2rem; font-size: 1rem; }

.btn-group {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  margin-top: .8rem;
}

/* ── Fill in the blank ── */
.fill-blank {
  display: inline-block;
  border-bottom: 2px solid var(--primary);
  min-width: 80px;
  padding: .1rem .4rem;
  font-family: 'Cascadia Code', monospace;
  font-size: .88rem;
  outline: none;
  background: transparent;
  color: var(--primary-dark);
  text-align: center;
}
.fill-blank:focus { background: var(--primary-light); border-radius: 4px; }

/* ── Matching exercise ── */
.match-row {
  display: flex;
  gap: .7rem;
  align-items: center;
  margin-bottom: .5rem;
  flex-wrap: wrap;
}
.match-term {
  background: var(--primary-light);
  border: 1px solid var(--primary);
  border-radius: 6px;
  padding: .4rem .8rem;
  font-weight: 600;
  font-size: .9rem;
  min-width: 160px;
}
.match-select {
  padding: .4rem .7rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: .9rem;
  background: var(--bg-card);
  color: var(--text);
  min-width: 200px;
}

/* ── Summary / key points ── */
.key-points {
  background: linear-gradient(135deg, var(--primary-light), #e8f5e9);
  border-radius: var(--radius);
  padding: 1.2rem 1.5rem;
  margin-top: 2rem;
}
.key-points h3 { color: var(--primary-dark); margin-bottom: .6rem; }
.key-points li { font-size: .93rem; }

/* ── Navigation ── */
.lesson-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: .7rem 1.5rem;
  box-shadow: 0 -2px 12px rgba(0,0,0,.1);
  z-index: 99;
}
.lesson-nav .nav-center {
  font-size: .85rem;
  color: var(--text-light);
  text-align: center;
}
.lesson-nav .nav-center a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}
.lesson-nav .nav-center a:hover { text-decoration: underline; }

/* ── E/R Diagram ── */
.er-diagram {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-start;
  margin: 1rem 0;
}
.er-entity {
  border: 2px solid var(--primary);
  border-radius: 8px;
  min-width: 160px;
}
.er-entity-name {
  background: var(--primary);
  color: #fff;
  text-align: center;
  padding: .4rem .7rem;
  font-weight: 700;
  font-size: .95rem;
  border-radius: 6px 6px 0 0;
}
.er-entity-attrs {
  padding: .4rem .7rem;
  font-size: .85rem;
  list-style: none;
}
.er-entity-attrs li {
  padding: .2rem 0;
  border-bottom: 1px solid var(--border);
  margin: 0;
}
.er-entity-attrs li:last-child { border-bottom: none; }
.er-entity-attrs .pk { color: var(--accent); font-weight: 700; }
.er-entity-attrs .fk { color: var(--secondary); font-style: italic; }

.er-relation {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-size: .85rem;
  color: var(--text-light);
  padding: .2rem 0;
}
.er-line {
  height: 2px;
  background: var(--primary);
  flex: 1;
  min-width: 30px;
}

/* ── Score display ── */
.score-display {
  text-align: center;
  padding: 1rem;
}
.score-circle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  border: 5px solid var(--primary);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: .5rem;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .site-header { flex-wrap: wrap; padding: .5rem 1rem; }
  .site-header h1 { font-size: .95rem; width: 100%; order: -1; }
  .lesson-container { padding: 1rem .8rem 5rem; }
  .card { padding: 1.1rem; }
  h1 { font-size: 1.5rem; }
  .lesson-nav { padding: .5rem 1rem; }
  .lesson-nav .btn span { display: none; }
}

/* ── Index page ── */
.index-hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--secondary) 100%);
  color: #fff;
  padding: 3rem 2rem 2.5rem;
  text-align: center;
}
.index-hero h1 { font-size: 2.2rem; margin-bottom: .5rem; }
.index-hero p  { opacity: .85; font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

.block-section { margin-bottom: 2.5rem; }
.block-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 1rem;
  padding-bottom: .4rem;
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: .5rem;
}
.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: .9rem;
}
.lesson-tile {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-decoration: none;
  color: var(--text);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  display: block;
}
.lesson-tile:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  border-color: var(--primary);
}
.lesson-tile .num {
  font-size: .72rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.lesson-tile .title {
  font-size: .95rem;
  font-weight: 600;
  line-height: 1.35;
  margin-top: .2rem;
}
.lesson-tile .time {
  font-size: .78rem;
  color: var(--text-light);
  margin-top: .4rem;
}

/* ── Utility ── */
.text-center { text-align: center; }
.mt-1 { margin-top: .5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-0 { margin-bottom: 0; }
.hidden { display: none; }
.flex-gap { display: flex; gap: .5rem; flex-wrap: wrap; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #b0c4d8; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }