/* ========================================
   2026 行业创新峰会 · 邀请函样式
   高端商务风格 · 移动端优先
   灵犀AI（炬森）品牌红色主题
   ======================================== */

:root {
  --gold: #CC1A25;
  --gold-light: #E8454F;
  --gold-dark: #99121A;
  --bg-deep: #0a0a0a;
  --bg-purple: #1a0505;
  --card-bg: rgba(255, 255, 255, 0.06);
  --card-border: rgba(204, 26, 37, 0.25);
  --text-white: #f0f0f5;
  --text-light: #c8c8d4;
  --text-muted: #9898a8;
  --input-bg: rgba(255, 255, 255, 0.07);
  --input-border: rgba(255, 255, 255, 0.15);
  --input-focus: var(--gold);
  --error-red: #e85d5d;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", Georgia, "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--text-white);
  background: linear-gradient(160deg, var(--bg-deep) 0%, var(--bg-purple) 50%, #000000 100%);
  min-height: 100vh;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.bg-particles {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.bg-particles .particle {
  position: absolute;
  width: 3px;
  height: 3px;
  background: var(--gold);
  border-radius: 50%;
  opacity: 0;
  animation: particleFloat linear infinite;
}

@keyframes particleFloat {
  0% { opacity: 0; transform: translateY(0) scale(0); }
  10% { opacity: 0.6; transform: translateY(-20px) scale(1); }
  90% { opacity: 0.3; }
  100% { opacity: 0; transform: translateY(-100vh) scale(0.5); }
}

.container {
  position: relative;
  z-index: 1;
  max-width: 480px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.invitation-card {
  position: relative;
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 40px 24px 32px;
  margin-bottom: 24px;
  overflow: hidden;
}

.card-ornament {
  position: absolute;
  width: 32px;
  height: 32px;
  border-color: var(--gold);
  opacity: 0.5;
}
.card-ornament.top-left {
  top: 12px; left: 12px;
  border-top: 1.5px solid; border-left: 1.5px solid;
  border-radius: 4px 0 0 0;
}
.card-ornament.top-right {
  top: 12px; right: 12px;
  border-top: 1.5px solid; border-right: 1.5px solid;
  border-radius: 0 4px 0 0;
}
.card-ornament.bottom-left {
  bottom: 12px; left: 12px;
  border-bottom: 1.5px solid; border-left: 1.5px solid;
  border-radius: 0 0 0 4px;
}
.card-ornament.bottom-right {
  bottom: 12px; right: 12px;
  border-bottom: 1.5px solid; border-right: 1.5px solid;
  border-radius: 0 0 4px 0;
}

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

.brand-name {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: 0.2em;
}

.card-header {
  text-align: center;
  margin-bottom: 24px;
}

.label-tag {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 0.8rem;
  color: var(--gold);
  letter-spacing: 0.3em;
  border: 1px solid var(--gold);
  padding: 4px 16px;
  border-radius: 2px;
  margin-bottom: 20px;
}

.event-title {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--gold-light);
  letter-spacing: 0.08em;
  line-height: 1.4;
  margin-bottom: 16px;
  text-shadow: 0 2px 12px rgba(204, 26, 37, 0.25);
}

.event-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.5em;
  font-weight: 300;
}
.divider {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 16px 0;
  gap: 12px;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0.4;
}
.divider.thin::before, .divider.thin::after {
  opacity: 0.25;
}
.divider-icon {
  color: var(--gold);
  font-size: 0.65rem;
  opacity: 0.7;
}

.greeting {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--gold-light);
  margin-bottom: 12px;
}

.event-desc {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.85;
  margin-bottom: 24px;
  text-indent: 2em;
}

.info-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.info-icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.info-content {
  display: flex;
  flex-direction: column;
}

.info-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-bottom: 2px;
}

.info-value {
  font-size: 0.92rem;
  color: var(--text-white);
  font-weight: 500;
}

.card-footer {
  text-align: center;
  margin-top: 24px;
}

.footer-note {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: var(--gold);
  letter-spacing: 0.2em;
  opacity: 0.8;
}

.form-section {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 32px 24px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  color: var(--gold-light);
  text-align: center;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

.section-desc {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}

.required {
  color: var(--gold);
  margin-left: 2px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  color: var(--text-white);
  font-size: 0.92rem;
  font-family: var(--font-sans);
  transition: border-color 0.3s, box-shadow 0.3s, background 0.3s;
  outline: none;
  -webkit-appearance: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px rgba(204, 26, 37, 0.15);
  background: rgba(255, 255, 255, 0.1);
}

.form-group input.error,
.form-group textarea.error {
  border-color: var(--error-red);
  box-shadow: 0 0 0 3px rgba(232, 93, 93, 0.12);
}

.form-group textarea {
  resize: vertical;
  min-height: 72px;
}

.form-group input[type="number"] {
  -moz-appearance: textfield;
}
.form-group input[type="number"]::-webkit-inner-spin-button,
.form-group input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.error-msg {
  display: block;
  font-size: 0.78rem;
  color: var(--error-red);
  margin-top: 6px;
  min-height: 18px;
}
.submit-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 14px 24px;
  margin-top: 8px;
  background: linear-gradient(135deg, var(--gold-dark), var(--gold), var(--gold-light));
  background-size: 200% 200%;
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
  font-family: var(--font-sans);
}

.submit-btn::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
  transition: left 0.6s ease;
}

.submit-btn:hover:not(:disabled)::after {
  left: 100%;
}

.submit-btn:hover:not(:disabled) {
  background-position: 100% 0;
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(204, 26, 37, 0.35);
}

.submit-btn:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(204, 26, 37, 0.2);
}

.submit-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(255, 255, 255, 0.3);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

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

.form-error {
  margin-top: 16px;
  padding: 12px 16px;
  background: rgba(232, 93, 93, 0.1);
  border: 1px solid rgba(232, 93, 93, 0.3);
  border-radius: 8px;
  color: var(--error-red);
  font-size: 0.85rem;
  text-align: center;
  display: none;
}
.form-error.visible {
  display: block;
  animation: shakeIn 0.4s ease;
}

.success-card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 48px 24px 36px;
  text-align: center;
}

.success-icon { margin-bottom: 24px; }

.success-icon .circle-bg {
  stroke-dasharray: 230;
  stroke-dashoffset: 230;
  animation: drawCircle 0.8s ease forwards;
}

.success-icon .checkmark {
  stroke-dasharray: 60;
  stroke-dashoffset: 60;
  animation: drawCheck 0.5s 0.6s ease forwards;
}

@keyframes drawCircle { to { stroke-dashoffset: 0; } }
@keyframes drawCheck { to { stroke-dashoffset: 0; } }

.success-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--gold-light);
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.success-desc {
  font-size: 0.92rem;
  color: var(--text-light);
  margin-bottom: 28px;
}

.success-info {
  display: flex;
  flex-direction: column;
  gap: 14px;
  text-align: left;
  margin-bottom: 24px;
  padding: 16px 20px;
  background: rgba(204, 26, 37, 0.06);
  border-radius: 10px;
  border: 1px solid rgba(204, 26, 37, 0.12);
}

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

.success-info-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.success-info-value {
  font-size: 0.88rem;
  color: var(--text-white);
  font-weight: 500;
}

.success-note {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-top: 16px;
}

.fade-in {
  animation: fadeInUp 0.7s ease forwards;
  opacity: 0;
}

.delay-1 { animation-delay: 0.25s; }

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

@keyframes shakeIn {
  0% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
  100% { transform: translateX(0); }
}

@media (min-width: 600px) {
  .container { padding: 48px 24px 64px; }
  .event-title { font-size: 2.2rem; }
  .invitation-card { padding: 48px 36px 40px; }
  .form-section { padding: 36px 32px; }
  .success-card { padding: 56px 36px 44px; }
}

@supports (padding-bottom: env(safe-area-inset-bottom)) {
  .container { padding-bottom: calc(48px + env(safe-area-inset-bottom)); }
}