/* ===== GLOBAL RESET ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ===== ROOT VARIABLES ===== */
:root {
  --primary: #FF9933;
  --primary-light: #FFF0E0;
  --primary-dark: #E6821A;
  --secondary: #E3F2FD;
  --secondary-fg: #1E3A5F;

  --bg: #ffffff;
  --surface: #FAFAFA;
  --border: rgba(0,0,0,0.08);

  --muted: #717182;
  --foreground: #1A1A2E;

  --radius: 16px;
  --nav-h: 72px;

  --success: #22C55E;
  --danger: #EF4444;
  --warning: #F59E0B;

  --font: 'Sora', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ===== BODY ===== */
html, body {
  height: 100%;
  background: #F0F4F8;
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

/* ===== APP SHELL ===== */
.shell {
  width: 100%;
  max-width: 420px;
  min-height: 100vh;
  margin: 0 auto;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.12);
}

/* ===== SCREENS ===== */
.screen {
  display: none;
  flex: 1;
  overflow-y: auto;
  padding-bottom: calc(var(--nav-h) + 16px);
  scroll-behavior: smooth;
}

.screen.active {
  display: block;
  animation: fadeUp 0.3s ease;
}

.screen.no-nav.active {
  min-height: 100vh;
  padding-bottom: 0;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== HEADER ===== */
.header {
  background: linear-gradient(160deg, #E3F2FD, #FFF8F0);
  padding: 50px 20px 24px;
}

.header h1,
.page-top h1,
.auth-card h1 {
  color: var(--foreground);
  font-family: var(--font);
  letter-spacing: 0;
}

.header h1 {
  font-size: 30px;
  line-height: 1.15;
  margin: 8px 0;
}

.header p,
.page-top p,
.muted {
  color: var(--muted);
  line-height: 1.5;
}

.page-top {
  padding: 46px 20px 18px;
  background: linear-gradient(160deg, #E3F2FD, #FFF8F0);
}

.page-top h1 {
  font-size: 28px;
  margin: 8px 0;
}

.content {
  padding: 20px;
}

.eyebrow {
  color: var(--primary-dark);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

/* ===== BUTTON FIXES ===== */
button {
  border: none;
  outline: none;
  font-family: var(--font-body);
  cursor: pointer;
}

button:focus-visible {
  outline: 2px solid var(--primary);
}

/* ===== INPUT FIXES ===== */
input, select {
  font-family: var(--font-body);
  outline: none;
}

input,
select {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  color: var(--foreground);
  font-size: 15px;
  padding: 0 14px;
}

input:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

label {
  color: var(--foreground);
  font-size: 13px;
  font-weight: 700;
}

/* ===== CARDS ===== */
.session-card,
.teacher-list-card,
.quick-card {
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  will-change: transform;
}

.auth-wrap {
  width: 100%;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: #F0F4F8;
}

.auth-card {
  width: 100%;
  max-width: 420px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  padding: 28px 22px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.12);
}

.auth-card h1 {
  font-size: 30px;
  margin: 8px 0;
}

.form {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.form-error {
  display: none;
  border-radius: 12px;
  background: #FEF2F2;
  color: var(--danger);
  font-size: 13px;
  padding: 10px 12px;
}

.form-error.visible {
  display: block;
}

.primary-btn,
.danger-btn,
.preview-btn,
.plain-btn {
  width: 100%;
  min-height: 48px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 700;
}

.primary-btn {
  background: var(--primary);
  color: #fff;
  margin-top: 8px;
}

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

.primary-btn:disabled {
  cursor: wait;
  opacity: 0.7;
}

.danger-btn {
  background: #FEF2F2;
  color: var(--danger);
  margin-top: 18px;
}

.preview-btn {
  border: 1px dashed var(--primary);
  background: var(--primary-light);
  color: var(--primary-dark);
  margin-top: 0;
}

.plain-btn {
  background: transparent;
  color: var(--muted);
  margin-top: 8px;
}

.switch-text {
  color: var(--muted);
  font-size: 14px;
  margin-top: 18px;
  text-align: center;
}

.switch-text button,
.section-head button,
.back-btn,
.session-card button {
  background: transparent;
  color: var(--primary-dark);
  font-weight: 700;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.section-head h2,
.panel h2,
.session-card h2,
.teacher-list-card h2,
.profile-panel h2 {
  color: var(--foreground);
  font-family: var(--font);
  font-size: 18px;
  letter-spacing: 0;
}

.chips {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 2px 0 16px;
}

.chip {
  align-items: center;
  flex: 0 0 auto;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  color: var(--foreground);
  display: inline-flex;
  font-size: 13px;
  gap: 8px;
  font-weight: 700;
  padding: 10px 14px;
}

.chip svg,
.card-icon svg,
.empty-icon svg,
.action-icon svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.chip.active {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary-dark);
}

.quick-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 8px 0 20px;
}

.quick-card {
  min-height: 112px;
  align-items: flex-start;
  justify-content: space-between;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--foreground);
  display: flex;
  flex-direction: column;
  padding: 16px;
  text-align: left;
}

.quick-card span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
}

.quick-card strong {
  align-items: center;
  display: inline-flex;
  gap: 8px;
}

.search-row {
  margin-bottom: 14px;
}

.teacher-list {
  display: grid;
  gap: 12px;
}

.teacher-list-card,
.session-card,
.panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  padding: 16px;
}

.teacher-list-card {
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
}

.teacher-list-card.featured {
  margin-top: 12px;
}

.avatar {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  color: #fff;
  display: grid;
  flex: 0 0 auto;
  font-family: var(--font);
  font-weight: 800;
  place-items: center;
}

.avatar.big {
  width: 76px;
  height: 76px;
  border-radius: 18px;
  margin: 14px 0 8px;
}

.teacher-main {
  min-width: 0;
}

.teacher-main p,
.session-card p,
.profile-panel p {
  color: var(--muted);
  font-size: 14px;
  margin-top: 4px;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.meta span,
.status {
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  padding: 6px 8px;
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.detail-grid div {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  padding: 14px;
}

.detail-grid span,
.summary-row span {
  color: var(--muted);
  display: block;
  font-size: 12px;
  margin-bottom: 6px;
}

.detail-grid strong,
.summary-row strong {
  color: var(--foreground);
  font-size: 15px;
}

.slot-group {
  margin-top: 16px;
}

.slot-group h3 {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 8px;
  text-transform: capitalize;
}

.slot-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.slot-btn {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--foreground);
  padding: 9px 12px;
}

.slot-btn.active {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary-dark);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.summary-row:last-of-type {
  border-bottom: 0;
}

.session-card {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.status.confirmed {
  background: #ECFDF5;
  color: var(--success);
}

.status.cancelled {
  background: #FEF2F2;
  color: var(--danger);
}

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

.profile-panel .avatar {
  margin: 0 auto 12px;
  background: linear-gradient(135deg,#FF9933,#FFB347);
}

.empty {
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--muted);
  line-height: 1.5;
  padding: 22px;
  text-align: center;
}

.first-booking {
  display: grid;
  gap: 18px;
}

.first-booking-hero {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(160deg, #FFF8F0, #E3F2FD);
  padding: 20px;
}

.first-booking-hero h2 {
  color: var(--foreground);
  font-family: var(--font);
  font-size: 24px;
  letter-spacing: 0;
  line-height: 1.2;
  margin: 12px 0 8px;
}

.first-booking-hero p {
  color: var(--muted);
  line-height: 1.5;
}

.steps {
  display: grid;
  gap: 10px;
}

.step-card {
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  display: flex;
  gap: 12px;
  padding: 14px;
}

.step-card strong {
  color: var(--foreground);
  display: block;
  font-size: 14px;
}

.step-card span {
  color: var(--muted);
  display: block;
  font-size: 13px;
  margin-top: 2px;
}

.card-icon,
.empty-icon,
.action-icon {
  align-items: center;
  background: var(--primary-light);
  border-radius: 12px;
  color: var(--primary-dark);
  display: inline-flex;
  flex: 0 0 auto;
  justify-content: center;
  min-height: 42px;
  min-width: 42px;
}

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

.success-mark {
  display: inline-grid;
  place-items: center;
  min-width: 60px;
  min-height: 32px;
  border-radius: 999px;
  background: #ECFDF5;
  color: var(--success);
  font-weight: 800;
  margin-bottom: 12px;
}

/* ===== HOVER SAFE ===== */
@media (hover: hover) {
  .session-card:hover,
  .teacher-list-card:hover,
  .quick-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.08);
  }
}

/* ===== BOTTOM NAV ===== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 420px;
  height: var(--nav-h);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: space-around;
  align-items: center;
  border-top: 1px solid var(--border);
}

/* ===== NAV ITEMS ===== */
.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--muted);
}

.nav-item svg {
  width: 21px;
  height: 21px;
  fill: currentColor;
}

.nav-item.active {
  color: var(--primary);
}

/* ===== TOAST ===== */
#toast {
  position: fixed;
  bottom: 90px;
  left: 50%;
  transform: translateX(-50%);
  background: #1A1A2E;
  color: white;
  padding: 10px 18px;
  border-radius: 12px;
  font-size: 13px;
  opacity: 0;
  transition: 0.25s;
}

/* ===== SCROLLBAR CLEAN ===== */
::-webkit-scrollbar {
  width: 0;
  height: 0;
}