/*
  CS-201 Web Lab Project - Group 4 Stylesheet
  Clean, minimal, flat design with a subtle neutral color scheme.
*/

:root {
  --theme-bg: #3b82f6;
  --theme-font-size: 16px;
  --theme-radius: 10px;
  --theme-spacing: 16px;

  /* Accent Colors */
  --primary: var(--theme-bg);
  --primary-hover: color-mix(in srgb, var(--primary) 85%, #000000);
  --success: #10b981;
  --success-hover: #059669;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #06b6d4;
  --secondary: #64748b;

  /* Light Theme */
  --bg-app: #f8fafc;
  --sidebar-bg: #ffffff;
  --sidebar-text: #334155;
  --card-bg: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --input-bg: #ffffff;
  --input-border: #cbd5e1;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
}


/* --- Base Layout --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: var(--theme-font-size);
  background-color: var(--bg-app);
  color: var(--text-main);
  min-height: 100vh;
}

.app-container {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  padding: 20px var(--theme-spacing);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
}

.logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
}

.logo-sub {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 2px;
  margin-bottom: 20px;
}

.sidebar-nav {
  flex-grow: 1;
}

.sidebar-nav ul {
  list-style: none;
}

.sidebar-nav li {
  margin-bottom: 4px;
}

.nav-divider {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  margin: 12px 0 6px 10px;
}

.nav-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: none;
  border: none;
  border-radius: var(--theme-radius);
  color: var(--sidebar-text);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.nav-btn:hover {
  background-color: var(--bg-app);
}

.nav-btn.active {
  background-color: var(--primary);
  color: #fff;
  font-weight: 600;
}

.nav-icon {
  font-size: 1.1rem;
  width: 20px;
  display: inline-block;
  text-align: center;
}

.mobile-close-btn {
  display: none;
}

.sidebar-footer {
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 10px;
}


.developer-tag {
  text-align: center;
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* --- Mobile Header --- */
.mobile-header {
  display: none;
  background: var(--sidebar-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 12px var(--theme-spacing);
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 90;
}

.mobile-menu-btn {
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.2rem;
  cursor: pointer;
}

/* --- Main Layout --- */
.main-content {
  padding: calc(var(--theme-spacing) * 1.5);
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.module-header {
  margin-bottom: 20px;
}

.module-header h2 {
  font-size: 1.3rem;
  margin-bottom: 4px;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.88rem;
}

/* --- Cards & UI Blocks --- */
.welcome-banner {
  background: linear-gradient(135deg, var(--card-bg) 0%, color-mix(in srgb, var(--primary) 4%, transparent) 100%);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary);
  border-radius: var(--theme-radius);
  padding: 20px;
  margin-bottom: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.welcome-text h1 {
  font-size: 1.3rem;
  margin-bottom: 4px;
}

.welcome-text p {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.4;
}

.welcome-stats {
  display: flex;
  gap: 10px;
}

.stat-card {
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: var(--theme-radius);
  text-align: center;
}

.stat-label {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
}

.stat-value {
  font-size: 1.1rem;
  font-weight: 700;
}

.section-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--theme-spacing);
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--theme-radius);
  padding: 16px;
  cursor: pointer;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  height: 140px;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.25s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
}

.card-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.feature-card h3 {
  font-size: 0.9rem;
  margin-bottom: 4px;
}

.feature-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: auto;
  line-height: 1.3;
}

.card-link {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  margin-top: 6px;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--theme-radius);
  padding: 18px;
  box-shadow: var(--shadow);
  margin-bottom: var(--theme-spacing);
}

.card h3 {
  font-size: 0.9rem;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 6px;
}

/* --- Forms & Buttons --- */
.input-group {
  margin-bottom: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.input-group label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
}

input[type="text"],
input[type="number"],
input[type="password"],
select,
textarea {
  width: 100%;
  padding: 8px 10px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--theme-radius);
  color: var(--text-main);
  font: inherit;
  font-size: 0.88rem;
  outline: none;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: var(--theme-radius);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: var(--success-hover); }
.btn-warning { background: var(--warning); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-secondary { background: var(--input-bg); border-color: var(--border-color); color: var(--text-main); }
.btn-sm { padding: 4px 8px; font-size: 0.75rem; }
.btn-icon { width: 26px; height: 26px; padding: 0; border-radius: 4px; }
.w-full { width: 100%; }

.card-layout {
  display: grid;
  gap: var(--theme-spacing);
}

.grid-1-2 {
  grid-template-columns: 1fr;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

@media (min-width: 900px) {
  .grid-1-2 {
    grid-template-columns: 1fr 2fr;
  }
}

/* --- Tables & Lists --- */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin-top: 6px;
}

th {
  background: var(--bg-app);
  color: var(--text-muted);
  font-weight: 600;
  padding: 8px;
  border-bottom: 2px solid var(--border-color);
  text-align: left;
}

td {
  padding: 8px;
  border-bottom: 1px solid var(--border-color);
}

.attendance-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.count-disp {
  min-width: 16px;
  text-align: center;
  font-weight: 700;
}

.badge {
  display: inline-block;
  padding: 2px 6px;
  font-size: 0.68rem;
  font-weight: 700;
  border-radius: 4px;
}

.badge-success { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.badge-danger { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.badge-info { background: rgba(6, 182, 212, 0.1); color: var(--info); }
.badge-warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.text-muted { color: var(--text-muted); }
.overflow-auto { overflow-x: auto; }

/* --- Module Specifics --- */
.converter-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.conversion-result-box {
  background: var(--bg-app);
  border: 1px dashed var(--border-color);
  padding: 10px;
  border-radius: var(--theme-radius);
  margin-top: 8px;
}

.result-label {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
}

.result-text {
  font-family: monospace;
  font-size: 1.25rem;
  font-weight: 700;
}

.validation-message {
  font-size: 0.75rem;
  margin-top: 2px;
}

.narrow-card {
  max-width: 480px;
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

.password-input-wrapper {
  position: relative;
}

.password-input-wrapper input {
  padding-right: 54px;
}

.password-toggle {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
}

.strength-meter-container {
  height: 4px;
  background: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  margin: 8px 0;
}

.strength-meter-bar {
  height: 100%;
  width: 0;
  background: var(--danger);
  transition: width 0.2s;
}

.strength-status-row {
  font-size: 0.8rem;
}

.checklist-grid {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-top: 1px solid var(--border-color);
  padding-top: 10px;
  margin-top: 10px;
}

.checklist-grid li {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.checklist-grid li.checked {
  color: var(--text-main);
}

.rule-icon {
  font-size: 0.75rem;
  width: 14px;
  text-align: center;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* --- Quiz System --- */
.quiz-progress-bar {
  height: 4px;
  background: var(--border-color);
  margin-bottom: 10px;
  overflow: hidden;
  border-radius: 2px;
}

.quiz-progress-fill {
  height: 100%;
  background: var(--danger);
  width: 0;
  transition: width 0.2s;
}

.quiz-q-num {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--danger);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.quiz-question-text {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.quiz-options-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.quiz-opt-btn {
  width: 100%;
  padding: 10px;
  text-align: left;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--theme-radius);
  font-size: 0.85rem;
  color: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
}

.quiz-opt-btn.selected {
  background: rgba(239, 68, 68, 0.05);
  border-color: var(--danger);
  color: var(--danger);
  font-weight: 600;
}

.quiz-nav-row {
  display: flex;
  justify-content: space-between;
}

.score-circle {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 3px solid var(--danger);
  color: var(--danger);
  font-size: 1.3rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 10px auto;
}

.quiz-breakdown {
  border-top: 1px solid var(--border-color);
  padding-top: 10px;
  max-height: 200px;
  overflow-y: auto;
  margin-bottom: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.breakdown-item {
  padding: 8px;
  background: var(--bg-app);
  font-size: 0.75rem;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.quiz-result-header {
  text-align: center;
  margin-bottom: 12px;
}

/* --- Expense Splitter --- */
.splitter-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--theme-spacing);
}

@media (min-width: 950px) {
  .splitter-layout {
    grid-template-columns: 200px 1fr 240px;
  }
}

.people-list {
  list-style: none;
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.person-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px;
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  font-size: 0.78rem;
  border-radius: 4px;
}

.person-item button,
.expense-item-amt button {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-weight: 700;
  padding: 0 4px;
}

.horizontal-form {
  display: grid;
  gap: 8px;
  margin-bottom: 10px;
}

@media (min-width: 600px) {
  .horizontal-form {
    grid-template-columns: 2fr 1fr 1.2fr auto;
  }
}

.expense-log-wrapper {
  margin-top: 12px;
  border-top: 1px solid var(--border-color);
  padding-top: 10px;
}

.expense-log-list {
  list-style: none;
  max-height: 200px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.expense-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 10px;
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  font-size: 0.78rem;
  border-radius: 4px;
}

.expense-item-info {
  display: flex;
  flex-direction: column;
}

.expense-item-desc {
  font-weight: 600;
}

.expense-item-meta {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.expense-item-amt {
  display: flex;
  align-items: center;
  gap: 6px;
}

.stats-summary-block {
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
}

.summary-item {
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  padding: 8px;
  border-radius: 4px;
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
}

.dues-summary-wrapper {
  border-top: 1px solid var(--border-color);
  padding-top: 10px;
  margin-top: 10px;
}

.dues-summary-wrapper h4,
.expense-log-wrapper h4 {
  font-size: 0.8rem;
  margin-bottom: 6px;
  color: var(--text-muted);
}

.settle-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px;
  background: color-mix(in srgb, var(--primary) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--primary) 15%, transparent);
  font-size: 0.78rem;
  margin-bottom: 4px;
  border-radius: 4px;
}

/* --- Theme Editor Form --- */
.theme-editor-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.color-picker-wrapper,
.range-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
}

input[type="color"] {
  -webkit-appearance: none;
  border: none;
  width: 28px;
  height: 28px;
  background: none;
  cursor: pointer;
}

input[type="color"]::-webkit-color-swatch {
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

input[type="range"] {
  flex-grow: 1;
  height: 4px;
  cursor: pointer;
}

.preview-box {
  border: 1px solid var(--border-color);
  border-radius: var(--theme-radius);
  padding: 12px;
  background: var(--bg-app);
  margin-top: 10px;
}

.flex-center-col { display: flex; flex-direction: column; align-items: center; justify-content: center; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-2 { gap: 8px; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.align-center { align-items: center; }
.text-center { text-align: center; }

/* --- Typing Speed Tester --- */
.typing-text-display-box {
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: var(--theme-radius);
  padding: 12px;
  font-size: 0.95rem;
  line-height: 1.5;
  font-family: monospace;
  max-height: 100px;
  overflow-y: auto;
  margin-bottom: 10px;
}

.typing-char {
  color: var(--text-muted);
}

.typing-char.correct {
  color: var(--success);
  background: rgba(16, 185, 129, 0.05);
}

.typing-char.incorrect {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.08);
}

.typing-char.active {
  color: var(--text-main);
  background: rgba(59, 130, 246, 0.1);
  border-bottom: 2px solid var(--primary);
}

.typing-textarea {
  resize: none;
  height: 60px;
  font-size: 0.85rem;
  margin-bottom: 10px;
}

.typing-metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

@media (min-width: 600px) {
  .typing-metrics-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.metric-card {
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  padding: 8px;
  border-radius: var(--theme-radius);
  text-align: center;
}

.metric-val {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
}

.metric-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 700;
  text-transform: uppercase;
}

/* --- Responsive Layout --- */
@media (max-width: 768px) {
  .app-container {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    left: -240px;
    width: 240px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 150;
    transition: left 0.2s;
  }

  .sidebar.open {
    left: 0;
  }

  .mobile-close-btn {
    display: block;
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.2rem;
    cursor: pointer;
  }

  .mobile-header {
    display: flex;
  }

  .main-content {
    padding: var(--theme-spacing);
  }
}