/* ===========================================================
   ScheduleCraft - style.css
   White & Blue theme | BTEC CSE 1st year project
   =========================================================== */

:root {
  --blue-900: #0b2545;
  --blue-700: #134074;
  --blue-600: #1d4ed8;
  --blue-500: #2563eb;
  --blue-400: #3b82f6;
  --blue-100: #dbeafe;
  --blue-50: #eff6ff;
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-500: #64748b;
  --gray-700: #334155;
  --gray-900: #0f172a;
  --green-500: #16a34a;
  --red-500: #dc2626;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 6px 20px rgba(29, 78, 216, 0.12);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.15);
  --radius: 14px;
}

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

html,
body {
  background: var(--gray-50);
}

body {
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  color: var(--gray-900);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--blue-600);
  text-decoration: none;
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 64px 0;
}

.grid {
  display: grid;
  gap: 24px;
}

.text-center {
  text-align: center;
}

.hidden {
  display: none !important;
}

/* ---------- View switching ---------- */
.view {
  display: none;
}
.view.active {
  display: block;
}

/* ---------- Navbar ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--blue-700);
  cursor: pointer;
  background: none;
  border: none;
}

.brand .logo {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--blue-600);
  color: var(--white);
  display: grid;
  place-items: center;
  font-size: 18px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a,
.nav-links .nav-link {
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--gray-700);
  font-weight: 500;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  font-family: inherit;
}

.nav-links a:hover,
.nav-links .nav-link:hover {
  background: var(--blue-50);
  color: var(--blue-700);
}

.nav-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--blue-100);
  color: var(--blue-700);
  display: grid;
  place-items: center;
  font-weight: 700;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.05s ease, background 0.2s ease, box-shadow 0.2s ease;
  background: var(--blue-600);
  color: var(--white);
  font-family: inherit;
}

.btn:hover {
  background: var(--blue-700);
  box-shadow: var(--shadow-md);
}

.btn:active {
  transform: translateY(1px);
}

.btn-outline {
  background: var(--white);
  color: var(--blue-700);
  border: 1px solid var(--blue-100);
}

.btn-outline:hover {
  background: var(--blue-50);
}

.btn-ghost {
  background: transparent;
  color: var(--gray-700);
}

.btn-ghost:hover {
  background: var(--gray-100);
  box-shadow: none;
}

.btn-danger {
  background: var(--red-500);
}

.btn-danger:hover {
  background: #b91c1c;
}

.btn-sm {
  padding: 7px 13px;
  font-size: 0.85rem;
}

.btn-block {
  width: 100%;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, var(--blue-50) 0%, var(--white) 100%);
  padding: 72px 0 56px;
}

.hero-grid {
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  background: var(--blue-100);
  color: var(--blue-700);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.hero h1 {
  font-size: clamp(2.1rem, 4vw, 3.2rem);
  line-height: 1.1;
  color: var(--blue-900);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero h1 span {
  color: var(--blue-600);
}

.hero p.lead {
  margin: 18px 0 28px;
  font-size: 1.1rem;
  color: var(--gray-700);
  max-width: 540px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 20px;
  padding: 22px;
  box-shadow: var(--shadow-lg);
}

.mini-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.mini-table th,
.mini-table td {
  border: 1px solid var(--gray-200);
  padding: 8px 6px;
  text-align: center;
}

.mini-table th {
  background: var(--blue-600);
  color: var(--white);
  font-weight: 600;
}

.mini-table td.slot {
  background: var(--blue-50);
  color: var(--blue-700);
  font-weight: 600;
}

/* ---------- Feature cards ---------- */
.features-grid {
  grid-template-columns: repeat(3, 1fr);
}

.card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.card .icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--blue-50);
  color: var(--blue-600);
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  font-size: 1.4rem;
}

.card h3 {
  font-size: 1.15rem;
  color: var(--blue-900);
  margin-bottom: 8px;
}

.card p {
  color: var(--gray-500);
  font-size: 0.95rem;
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 44px;
}

.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--blue-900);
  margin-bottom: 12px;
}

.section-head p {
  color: var(--gray-500);
}

/* ---------- Steps ---------- */
.steps-grid {
  grid-template-columns: repeat(4, 1fr);
}

.step {
  text-align: center;
}

.step .num {
  width: 44px;
  height: 44px;
  margin: 0 auto 14px;
  border-radius: 50%;
  background: var(--blue-600);
  color: var(--white);
  font-weight: 700;
  display: grid;
  place-items: center;
}

.step h4 {
  color: var(--blue-900);
  margin-bottom: 6px;
}

.step p {
  color: var(--gray-500);
  font-size: 0.9rem;
}

/* ---------- Future scope ---------- */
.future {
  background: var(--blue-900);
  color: var(--white);
  border-radius: 22px;
  padding: 44px;
}

.future h2 {
  color: var(--white);
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.future p.sub {
  color: var(--blue-100);
  margin-bottom: 28px;
}

.future-grid {
  grid-template-columns: repeat(3, 1fr);
}

.future-item {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  padding: 18px;
}

.future-item h4 {
  margin-bottom: 6px;
  color: var(--white);
}

.future-item p {
  color: var(--blue-100);
  font-size: 0.88rem;
}

.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--blue-400);
  color: var(--white);
  margin-bottom: 10px;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--white);
  border-top: 1px solid var(--gray-200);
  padding: 30px 0;
  margin-top: 56px;
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--gray-500);
  font-size: 0.9rem;
}

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 37, 69, 0.55);
  display: grid;
  place-items: center;
  z-index: 100;
  padding: 20px;
}

.modal {
  background: var(--white);
  border-radius: 18px;
  width: 100%;
  max-width: 420px;
  padding: 30px;
  box-shadow: var(--shadow-lg);
  animation: pop 0.18s ease;
  position: relative;
}

@keyframes pop {
  from {
    transform: scale(0.95);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.modal h3 {
  font-size: 1.4rem;
  color: var(--blue-900);
  margin-bottom: 4px;
}

.modal .muted {
  color: var(--gray-500);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.tabs {
  display: flex;
  background: var(--gray-100);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 20px;
}

.tab {
  flex: 1;
  text-align: center;
  padding: 9px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--gray-500);
}

.tab.active {
  background: var(--white);
  color: var(--blue-700);
  box-shadow: var(--shadow-sm);
}

/* ---------- Forms ---------- */
.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 6px;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--gray-300);
  border-radius: 10px;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--white);
  color: var(--gray-900);
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--blue-500);
  box-shadow: 0 0 0 3px var(--blue-100);
}

.form-error {
  background: #fef2f2;
  color: var(--red-500);
  border: 1px solid #fecaca;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  margin-bottom: 14px;
}

.modal-foot {
  margin-top: 6px;
  text-align: center;
  font-size: 0.88rem;
  color: var(--gray-500);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 18px;
  border: none;
  background: transparent;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--gray-500);
}

/* ---------- Dashboard layout ---------- */
.page {
  min-height: calc(100vh - 68px);
  background: var(--gray-50);
}

.page-head {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: 28px 0;
}

.page-head h1 {
  color: var(--blue-900);
  font-size: 1.7rem;
}

.page-head p {
  color: var(--gray-500);
}

/* type chooser */
.type-grid {
  grid-template-columns: repeat(2, 1fr);
  margin-bottom: 24px;
}

.type-card {
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 24px;
  cursor: pointer;
  background: var(--white);
  transition: all 0.15s ease;
}

.type-card:hover {
  border-color: var(--blue-400);
}

.type-card.selected {
  border-color: var(--blue-600);
  background: var(--blue-50);
}

.type-card .icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--blue-100);
  color: var(--blue-700);
  display: grid;
  place-items: center;
  margin-bottom: 14px;
  font-size: 1.4rem;
}

.type-card h3 {
  color: var(--blue-900);
  margin-bottom: 6px;
}

.type-card p {
  color: var(--gray-500);
  font-size: 0.9rem;
}

/* mode toggle */
.mode-toggle {
  display: inline-flex;
  background: var(--gray-100);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 20px;
}

.mode-toggle button {
  border: none;
  background: transparent;
  padding: 9px 18px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  color: var(--gray-500);
  font-size: 0.9rem;
  font-family: inherit;
}

.mode-toggle button.active {
  background: var(--white);
  color: var(--blue-700);
  box-shadow: var(--shadow-sm);
}

.panel {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow-sm);
}

.panel h2 {
  color: var(--blue-900);
  font-size: 1.2rem;
  margin-bottom: 4px;
}

.panel .hint {
  color: var(--gray-500);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.subjects-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.add-subject {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
}

.add-subject input {
  flex: 1;
}

/* chips (subjects/activities) */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--blue-50);
  border: 1px solid var(--blue-100);
  color: var(--blue-900);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 6px 12px;
  border-radius: 999px;
}
.chip button {
  border: none;
  background: transparent;
  color: var(--red-500);
  cursor: pointer;
  font-size: 1.05rem;
  line-height: 1;
  padding: 0;
}

/* generated timetable */
.timetable-wrap {
  overflow-x: auto;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
}

#timetableArea {
  padding: 20px;
  background: var(--white);
}

table.timetable {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

table.timetable th,
table.timetable td {
  border: 1px solid var(--gray-200);
  padding: 10px 8px;
  text-align: center;
}

table.timetable thead th {
  background: var(--blue-600);
  color: var(--white);
  font-weight: 600;
}

table.timetable td.time-col,
table.timetable th.time-col {
  background: var(--blue-50);
  color: var(--blue-700);
  font-weight: 600;
  white-space: nowrap;
}

table.timetable td.cell-break {
  background: var(--gray-100);
  color: var(--gray-500);
  font-style: italic;
}

.cell-select {
  width: 100%;
  min-width: 90px;
  padding: 6px 8px;
  font-size: 0.82rem;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  background: var(--white);
  color: var(--gray-900);
}

.export-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px dashed var(--gray-200);
}

.export-bar .label {
  width: 100%;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray-500);
}

/* history stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.stat-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 14px;
  padding: 20px;
  text-align: center;
}
.stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--blue-600);
  line-height: 1;
}
.stat-label {
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--gray-500);
  font-weight: 600;
}

/* history cards */
.history-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 14px;
  padding: 18px 20px;
  margin-bottom: 14px;
  transition: box-shadow 0.18s ease, transform 0.18s ease;
}
.history-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}
.history-main {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  flex: 1;
  min-width: 240px;
}
.history-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  flex-shrink: 0;
  background: var(--blue-50);
}
.history-icon.personal {
  background: #fef3c7;
}
.history-info h3 {
  color: var(--blue-900);
  font-size: 1.05rem;
  margin-bottom: 6px;
}
.history-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}
.tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--blue-100);
  color: var(--blue-700);
}
.tag-mode {
  background: #dcfce7;
  color: var(--green-500);
}
.history-meta {
  color: var(--gray-500);
  font-size: 0.82rem;
}
.history-downloads {
  color: var(--gray-500);
  font-size: 0.82rem;
  margin-top: 2px;
}
.history-downloads strong {
  color: var(--blue-700);
}
.history-downloads .dot {
  margin: 0 4px;
}
.history-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

/* empty state */
.empty {
  text-align: center;
  padding: 56px 20px;
  background: var(--white);
  border: 1px dashed var(--gray-200);
  border-radius: 14px;
  color: var(--gray-500);
}
.empty .icon {
  font-size: 2.6rem;
  margin-bottom: 12px;
}
.empty h3 {
  color: var(--blue-900);
  margin-bottom: 6px;
}
.empty p {
  margin-bottom: 18px;
}

/* large modal (history preview) */
.modal-lg {
  max-width: 760px;
  width: 100%;
}
#previewArea {
  padding: 16px;
  background: var(--white);
}

/* toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--blue-900);
  color: var(--white);
  padding: 13px 22px;
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
  font-size: 0.9rem;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.error {
  background: var(--red-500);
}

.toast.success {
  background: var(--green-500);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-grid,
  .features-grid,
  .future-grid {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .type-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .nav-links a.nav-extra,
  .nav-links .nav-extra {
    display: none;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .future {
    padding: 28px 20px;
  }
}