/* ============================================================
   style.css
   Theme: Kanit + Deep Navy Gradient
   Primary: #2e5a73 → #162c3b
   ============================================================ */

/* ---------- Google Font ---------- */
@import url('https://fonts.googleapis.com/css2?family=Kanit:wght@300;400;500;600;700;900&display=swap');

/* ---------- CSS Variables (เปลี่ยนธีมที่นี่จุดเดียว) ---------- */
:root {
  --bg-gradient: linear-gradient(135deg, #2e5a73 0%, #1e3f56 50%, #162c3b 100%);
  --primary: #2e5a73;
  --primary-dark: #162c3b;
  --accent: #ffd700;
  --accent-hover: #ffec6e;
  --accent-glow: rgba(255, 215, 0, 0.35);
  --card-bg: rgba(255, 255, 255, 0.06);
  --card-border: rgba(255, 255, 255, 0.12);
  --card-blur: blur(16px);
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.75);
  --text-muted: rgba(255, 255, 255, 0.45);
  --input-bg: rgba(255, 255, 255, 0.08);
  --input-border: rgba(255, 255, 255, 0.2);
  --input-focus-border: #ffd700;
  --success: #43aa8b;
  --error: #f94144;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-btn: 0 4px 20px rgba(255, 215, 0, 0.4);
  --radius-card: 20px;
  --radius-input: 10px;
  --radius-btn: 50px;
  --font: 'Kanit', sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-weight: 400;
  background: var(--bg-gradient);
  min-height: 100vh;
  color: var(--text-primary);
  overflow-x: hidden;
  position: relative;
}

/* ---------- Background Decoration ---------- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(46, 90, 115, 0.5) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 90%, rgba(22, 44, 59, 0.7) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(255,255,255,0.04) 1px, transparent 0);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

/* ---------- Main Container ---------- */
#app {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
}

/* ---------- Page Sections (ควบคุมด้วย JS) ---------- */
.page-section {
  display: none;
  width: 100%;
  max-width: 540px;
  animation: fadeInUp 0.5s ease forwards;
}

.page-section.active {
  display: block;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Card ---------- */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  backdrop-filter: var(--card-blur);
  -webkit-backdrop-filter: var(--card-blur);
  border-radius: var(--radius-card);
  padding: 40px 36px;
  box-shadow: var(--shadow-card);
}

/* ---------- Logo ---------- */
.logo-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 28px;
}

.logo-img {
  max-width: 180px;
  max-height: 80px;
  object-fit: contain;
  filter: drop-shadow(0 2px 12px rgba(0,0,0,0.4));
}

.logo-placeholder {
  width: 180px;
  height: 70px;
  border: 2px dashed var(--input-border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 13px;
  letter-spacing: 0.5px;
}

/* ---------- Headings ---------- */
.section-title {
  font-size: 26px;
  font-weight: 700;
  text-align: center;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 14px;
  font-weight: 300;
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.6;
}

.accent-line {
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 2px;
  margin: 8px auto 24px;
}

/* ---------- Form ---------- */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
}

.form-label span.required {
  color: var(--accent);
  margin-left: 2px;
}

.form-input {
  font-family: var(--font);
  font-size: 14px;
  font-weight: 400;
  color: var(--text-primary);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-input);
  padding: 10px 14px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  width: 100%;
}

.form-input::placeholder {
  color: var(--text-muted);
  font-weight: 300;
}

.form-input:focus {
  border-color: var(--input-focus-border);
  background: rgba(255, 255, 255, 0.1);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-input.error {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(249, 65, 68, 0.2);
}

.field-error {
  font-size: 11px;
  color: var(--error);
  display: none;
}

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

/* ---------- Buttons ---------- */
.btn {
  font-family: var(--font);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.5px;
  border: none;
  border-radius: var(--radius-btn);
  padding: 14px 36px;
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  margin-top: 24px;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(255,255,255,0.12), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.btn:hover::after { opacity: 1; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #e6a800);
  color: #162c3b;
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(255, 215, 0, 0.55);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
  box-shadow: none;
  margin-top: 12px;
}

.btn-outline:hover {
  background: rgba(255, 215, 0, 0.1);
  transform: translateY(-2px);
}

/* ---------- Wheel Section ---------- */
#wheel-section .card {
  max-width: 640px;
  text-align: center;
}

.wheel-container {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 20px 0;
}

.wheel-pointer {
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  filter: drop-shadow(0 2px 6px rgba(0,0,0,0.5));
}

canvas#wheelCanvas {
  border-radius: 50%;
  box-shadow: 0 0 0 6px rgba(255,215,0,0.25), 0 8px 40px rgba(0,0,0,0.5);
  transition: box-shadow 0.3s;
}

canvas#wheelCanvas.spinning {
  box-shadow: 0 0 0 6px rgba(255,215,0,0.5), 0 8px 60px rgba(0,0,0,0.6);
}

/* ---------- Result Section ---------- */
.result-icon {
  font-size: 72px;
  text-align: center;
  margin: 0 0 16px;
  animation: bounceIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes bounceIn {
  0%   { transform: scale(0); opacity: 0; }
  60%  { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(1); }
}

.result-prize-name {
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
  text-align: center;
  margin-bottom: 8px;
  text-shadow: 0 0 20px var(--accent-glow);
}

.result-instruction {
  font-size: 15px;
  font-weight: 400;
  color: var(--text-secondary);
  text-align: center;
  background: rgba(255,215,0,0.08);
  border: 1px solid rgba(255,215,0,0.2);
  border-radius: 12px;
  padding: 14px 20px;
  margin: 16px 0 0;
  line-height: 1.7;
}

.result-instruction strong {
  color: var(--accent);
  font-weight: 600;
  display: block;
  font-size: 16px;
  margin-bottom: 4px;
}

/* ---------- Loading Spinner ---------- */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(0,0,0,0.3);
  border-top-color: #162c3b;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------- Toast Notification ---------- */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: rgba(22, 44, 59, 0.95);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(12px);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 14px;
  padding: 12px 24px;
  border-radius: 50px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  z-index: 1000;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  white-space: nowrap;
}

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

.toast.success { border-color: var(--success); }
.toast.error   { border-color: var(--error); }

/* ---------- Responsive ---------- */
@media (max-width: 560px) {
  .card {
    padding: 28px 20px;
  }

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

  .form-group.full-width {
    grid-column: 1;
  }

  .section-title {
    font-size: 22px;
  }

  #wheel-section .card {
    padding: 24px 16px;
  }
}

@media (min-width: 640px) {
  #wheel-section {
    max-width: 680px;
  }
}

/* ---------- Confetti (Canvas overlay) ---------- */
#confetti-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
}