/* ================================================================
   STYLE.CSS — Student Life Dashboard
   ----------------------------------------------------------------
   HOW THIS FILE IS ORGANIZED:
   1. CSS Variables (colors, sizes) — easy to change theme here
   2. Reset & Base styles
   3. Sidebar
   4. Main content area
   5. Section layouts
   6. Cards
   7. Forms & Inputs
   8. Task list styles
   9. Homework list styles
  10. Pomodoro Timer styles
  11. Daily Planner styles
  12. Chat / Assistant styles
  13. Dashboard stats
  14. Animations
  15. Responsive (mobile) styles
================================================================ */

/* ── 1. CSS VARIABLES ─────────────────────────────────────────
   Think of variables as settings. Change a value here and it
   updates everywhere that variable is used. */
:root {
  /* Light Mode Colors */
  --bg-page:       #f0ede8;
  --bg-sidebar:    #1a1a2e;
  --bg-card:       #ffffff;
  --bg-input:      #f7f5f2;

  --text-primary:  #1c1c2e;
  --text-secondary:#5a5a72;
  --text-sidebar:  #c8c8e0;
  --text-on-accent:#ffffff;

  --accent:        #e06c3a;   /* warm orange accent */
  --accent-hover:  #c8582a;
  --accent-light:  #fdeee6;

  --success:       #3abf7e;
  --danger:        #e04a4a;
  --warning:       #e0a43a;
  --info:          #3a8be0;

  --border:        #e4e0da;
  --shadow:        0 4px 24px rgba(0,0,0,0.07);
  --shadow-hover:  0 8px 32px rgba(0,0,0,0.12);

  --sidebar-width: 230px;
  --radius:        14px;
  --radius-sm:     8px;

  /* Font families */
  --font-heading:  'Syne', sans-serif;
  --font-body:     'DM Sans', sans-serif;

  /* Transition speed for animations */
  --transition:    0.25s ease;
}

/* ── Dark Mode: overrides the variables above ── */
body.dark-mode {
  --bg-page:       #0f0f1a;
  --bg-sidebar:    #07070f;
  --bg-card:       #1a1a2e;
  --bg-input:      #12121f;

  --text-primary:  #e8e8f4;
  --text-secondary:#8888a8;
  --text-sidebar:  #9090b8;

  --accent:        #ff7d4a;
  --accent-hover:  #ff6030;
  --accent-light:  #2a1810;

  --border:        #2a2a42;
  --shadow:        0 4px 24px rgba(0,0,0,0.3);
  --shadow-hover:  0 8px 32px rgba(0,0,0,0.5);
}

/* ── 2. RESET & BASE ──────────────────────────────────────────
   Clears default browser styling and sets sensible defaults. */
*, *::before, *::after {
  box-sizing: border-box;   /* padding included in element width */
  margin: 0;
  padding: 0;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-page);
  color: var(--text-primary);
  display: flex;              /* sidebar + main side by side */
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

/* ── 3. SIDEBAR ───────────────────────────────────────────────*/
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  display: flex;
  flex-direction: column;   /* stack brand / nav / footer */
  padding: 24px 16px;
  position: fixed;          /* stays in place while content scrolls */
  top: 0; left: 0;
  height: 100vh;
  z-index: 100;
  transition: transform var(--transition);
  overflow-y: auto;
}

/* Brand / Logo area */
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 8px 28px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 24px;
}
.brand-icon { font-size: 1.6rem; }
.brand-name {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.3px;
}

/* Nav buttons */
.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;              /* fills available space */
}

.nav-btn {
  background: none;
  border: none;
  color: var(--text-sidebar);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: background var(--transition), color var(--transition);
}
.nav-btn:hover {
  background: rgba(255,255,255,0.07);
  color: #fff;
}
.nav-btn.active {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}
.nav-icon { font-size: 1rem; width: 20px; text-align: center; }

/* Footer with theme toggle */
.sidebar-footer {
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.theme-toggle {
  width: 100%;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-sidebar);
  font-family: var(--font-body);
  font-size: 0.88rem;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background var(--transition);
}
.theme-toggle:hover {
  background: rgba(255,255,255,0.12);
  color: #fff;
}

/* Hamburger button (hidden on desktop, shown on mobile) */
.hamburger {
  display: none;
  position: fixed;
  top: 16px; left: 16px;
  z-index: 200;
  background: var(--bg-sidebar);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  width: 42px; height: 42px;
  font-size: 1.2rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* ── 4. MAIN CONTENT ──────────────────────────────────────────*/
.main-content {
  margin-left: var(--sidebar-width);   /* leave room for sidebar */
  flex: 1;
  padding: 40px 36px;
  max-width: 960px;
}

/* ── 5. SECTIONS ──────────────────────────────────────────────
   Each section is hidden by default; only .active is shown. */
.section { display: none; animation: fadeIn 0.3s ease; }
.section.active { display: block; }

.section-header { margin-bottom: 28px; }
.section-header h1 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  line-height: 1.2;
}
.subtitle {
  color: var(--text-secondary);
  margin-top: 6px;
  font-size: 0.95rem;
}

/* ── 6. CARDS ─────────────────────────────────────────────────
   White boxes that group related content. */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  border: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.card:hover { box-shadow: var(--shadow-hover); }
.card h3 {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

/* ── 7. FORMS & INPUTS ────────────────────────────────────────*/
/* A row of inputs that sit side-by-side */
.input-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
/* Stack rows vertically */
.input-col { display: flex; flex-direction: column; gap: 10px; }

.input-field {
  flex: 1;
  min-width: 140px;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--text-primary);
  transition: border-color var(--transition);
  outline: none;
}
.input-field:focus { border-color: var(--accent); }
.input-field::placeholder { color: var(--text-secondary); opacity: 0.7; }

.select-field {
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--text-primary);
  cursor: pointer;
  outline: none;
}

/* Buttons */
.btn {
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}
.btn-secondary {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover { background: var(--border); }
.btn-ghost {
  background: none;
  color: var(--text-secondary);
}
.btn-ghost:hover { color: var(--text-primary); }

/* Small icon button (used for delete) */
.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  padding: 4px 6px;
  border-radius: 6px;
  transition: background var(--transition);
  color: var(--text-secondary);
}
.btn-icon:hover { background: var(--border); color: var(--danger); }

/* Filter row (above task list) */
.filter-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.filter-btn {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: 20px;
  padding: 6px 16px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.filter-btn:hover, .filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ── 8. TASK LIST ─────────────────────────────────────────────*/
.task-list, .hw-list, .planner-list, .snapshot-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.task-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  transition: all var(--transition);
  animation: slideIn 0.25s ease;
}
.task-item:hover { border-color: var(--accent); }

/* Checkbox */
.task-item input[type="checkbox"] {
  width: 18px; height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

/* Task text */
.task-text {
  flex: 1;
  font-size: 0.92rem;
  transition: color var(--transition);
}
.task-item.completed .task-text {
  text-decoration: line-through;
  color: var(--text-secondary);
  opacity: 0.7;
}

/* Category badge */
.task-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  flex-shrink: 0;
}
.badge-School   { background: #dbeafe; color: #1e40af; }
.badge-Personal { background: #dcfce7; color: #166534; }
.badge-Urgent   { background: #fee2e2; color: #991b1b; }

body.dark-mode .badge-School   { background: #1e3a5f; color: #93c5fd; }
body.dark-mode .badge-Personal { background: #14402a; color: #86efac; }
body.dark-mode .badge-Urgent   { background: #4a1414; color: #fca5a5; }

/* Empty state message */
.empty-msg {
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-align: center;
  padding: 16px;
  opacity: 0.7;
}

/* ── 9. HOMEWORK LIST ─────────────────────────────────────────*/
.hw-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  animation: slideIn 0.25s ease;
  transition: border-color var(--transition);
}
.hw-item:hover { border-color: var(--accent); }

/* Red highlight for overdue assignments */
.hw-item.overdue {
  border-color: var(--danger);
  background: rgba(224,74,74,0.06);
}

.hw-info { flex: 1; }
.hw-subject {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--accent);
}
.hw-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-top: 2px;
}
.hw-due {
  font-size: 0.8rem;
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.hw-item.overdue .hw-due { color: var(--danger); font-weight: 600; }

/* ── 10. POMODORO TIMER ───────────────────────────────────────*/
.timer-card {
  text-align: center;
  position: relative;
}

/* Mode toggle buttons */
.timer-modes {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 32px;
}
.mode-btn {
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: 20px;
  padding: 8px 20px;
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--text-secondary);
}
.mode-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* SVG ring sits behind the number display */
.timer-ring {
  width: 200px;
  height: 200px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -70px);
  pointer-events: none;
}
.ring-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 8;
}
.ring-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 8;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
  transition: stroke-dashoffset 1s linear;
}

/* Big countdown number */
.timer-display {
  font-family: var(--font-heading);
  font-size: 4rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -2px;
  margin: 24px 0 32px;
  position: relative;
  z-index: 1;
}

.timer-controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.session-info {
  margin-top: 20px;
  color: var(--text-secondary);
  font-size: 0.88rem;
}

/* ── 11. DAILY PLANNER ────────────────────────────────────────*/
.planner-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  animation: slideIn 0.25s ease;
}
.planner-time {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent);
  min-width: 56px;
}
.planner-activity {
  flex: 1;
  font-size: 0.92rem;
}

/* ── 12. CHAT / ASSISTANT ─────────────────────────────────────*/
.chat-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Scrollable message area */
.chat-messages {
  height: 360px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 4px 4px 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

/* Individual chat bubbles */
.chat-bubble {
  max-width: 78%;
  padding: 12px 16px;
  border-radius: 16px;
  font-size: 0.9rem;
  line-height: 1.55;
  animation: bubbleIn 0.2s ease;
}
/* Bot messages on the left */
.chat-bubble.bot {
  background: var(--accent-light);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
  align-self: flex-start;
  border: 1px solid var(--border);
}
/* User messages on the right */
.chat-bubble.user {
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 4px;
  align-self: flex-end;
}

/* Quick prompt suggestion buttons */
.chat-suggestions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.suggestion-btn {
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 0.82rem;
  font-family: var(--font-body);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.suggestion-btn:hover {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

.chat-input-row {
  display: flex;
  gap: 10px;
}

/* ── 13. DASHBOARD STATS ──────────────────────────────────────*/
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}
.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}
.stat-icon { font-size: 1.8rem; flex-shrink: 0; }
.stat-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}
.stat-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* Progress bar */
.progress-bar-wrap {
  background: var(--bg-input);
  border-radius: 20px;
  height: 12px;
  overflow: hidden;
  margin: 12px 0 8px;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--warning));
  border-radius: 20px;
  transition: width 0.6s ease;
}
.progress-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Snapshot list (urgent tasks on dashboard) */
.snapshot-list .task-snippet {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  border: 1px solid var(--border);
}

/* ── 14. ANIMATIONS ───────────────────────────────────────────*/
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-10px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes bubbleIn {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 1; transform: scale(1); }
}

/* ── 15. RESPONSIVE (MOBILE) ──────────────────────────────────
   When the screen is smaller than 768px, we stack things. */
@media (max-width: 768px) {
  /* Sidebar hides off-screen by default on mobile */
  .sidebar {
    transform: translateX(-100%);
  }
  /* When sidebar has .open class (toggled by JS), it slides in */
  .sidebar.open {
    transform: translateX(0);
  }

  /* Show hamburger button on mobile */
  .hamburger {
    display: flex;
  }

  /* Main content takes full width on mobile */
  .main-content {
    margin-left: 0;
    padding: 70px 18px 24px;
  }

  .section-header h1 { font-size: 1.5rem; }
  .timer-display { font-size: 3rem; }

  .input-row { flex-direction: column; }
  .input-row .btn { width: 100%; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}