:root {
  --color-primary: #4f6ef7;
  --color-primary-dark: #3b57d9;
  --color-bg: #f7f8fc;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #666666;
  --color-border: #e8e4df;
  --color-wechat: #07c160;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

/* Header */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--color-text);
}

.logo:hover {
  text-decoration: none;
}

.logo-img {
  height: 36px;
  width: auto;
  display: block;
  object-fit: contain;
}

.logo-text {
  font-weight: 600;
  font-size: 1.05rem;
}

.site-nav {
  display: flex;
  gap: 1.5rem;
}

.site-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-primary);
  text-decoration: none;
}

/* Footer */
.site-footer {
  background: #1f1f1f;
  color: #ccc;
  margin-top: 4rem;
  padding: 2.5rem 0 1.5rem;
}

.footer-inner {
  display: grid;
  gap: 1.5rem;
}

.footer-brand strong {
  color: #fff;
  font-size: 1rem;
}

.footer-brand p {
  margin: 0.4rem 0 0;
  font-size: 0.9rem;
  color: #999;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: #aaa;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: #fff;
}

.footer-copy {
  border-top: 1px solid #333;
  padding-top: 1rem;
  font-size: 0.85rem;
  color: #777;
}

.footer-copy p {
  margin: 0.2rem 0;
}

.beian {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem 0.75rem;
  font-size: 0.8rem;
}

.beian a {
  color: #999;
}

.beian a:hover {
  color: #ccc;
}

.beian-sep {
  color: #555;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #1e2a5e 0%, #3b4cb8 45%, #5b6df5 100%);
  color: #fff;
  padding: 5rem 0 4.5rem;
  text-align: center;
}

.hero-eyebrow {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.65);
}

.hero-brand {
  margin: 0 0 1rem;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.hero-brand span {
  color: #a5b4ff;
}

.hero .subtitle {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.8);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, transform 0.1s;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

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

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

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

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.btn-wechat {
  background: var(--color-wechat);
  color: #fff;
  width: 100%;
  padding: 0.85rem;
  font-size: 1rem;
}

.btn-wechat:hover {
  background: #06ad56;
  color: #fff;
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: #eee;
  color: var(--color-text);
}

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

/* Sections */
.section {
  padding: 4rem 0;
}

.section-alt {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  text-align: center;
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
}

.section-desc {
  text-align: center;
  color: var(--color-text-muted);
  margin: 0 0 2.5rem;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

.card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* Page header */
.page-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 2.5rem 0;
  text-align: center;
}

.page-header h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
}

.page-header p {
  margin: 0;
  color: var(--color-text-muted);
}

/* Content */
.content-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1.5rem;
}

.content-block h2 {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  color: var(--color-primary);
}

.content-block h3 {
  margin: 1.5rem 0 0.75rem;
  font-size: 1.05rem;
}

.content-block p,
.content-block li {
  color: var(--color-text-muted);
}

.content-block ul {
  padding-left: 1.25rem;
}

/* Login */
.auth-page {
  padding: 3rem 0 4rem;
}

.auth-card {
  max-width: 420px;
  margin: 0 auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-md);
}

.auth-card h1 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  text-align: center;
}

.auth-card .auth-desc {
  text-align: center;
  color: var(--color-text-muted);
  margin: 0 0 2rem;
  font-size: 0.95rem;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 110, 247, 0.15);
}

.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--color-surface);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 110, 247, 0.15);
}

.form-hint {
  margin: 0.35rem 0 0;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: right;
}

.feedback-card {
  max-width: 560px;
}

.bind-section {
  margin-bottom: 1rem;
}

.bind-section h2 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
}

.feedback-history {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.feedback-history-title {
  margin: 0 0 1rem;
  font-size: 1rem;
}

.feedback-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.feedback-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.feedback-item:last-child {
  border-bottom: none;
}

.feedback-item-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
}

.feedback-tag {
  background: rgba(79, 110, 247, 0.1);
  color: var(--color-primary);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-weight: 500;
}

.feedback-time {
  color: var(--color-text-muted);
}

.feedback-status {
  margin-left: auto;
  color: #d97706;
}

.feedback-status.done {
  color: #16a34a;
}

.feedback-content {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.sms-row {
  display: flex;
  gap: 0.75rem;
}

.sms-row input {
  flex: 1;
}

.sms-row .btn {
  white-space: nowrap;
  flex-shrink: 0;
}

.auth-message {
  margin-top: 1rem;
  padding: 0.75rem;
  border-radius: 8px;
  font-size: 0.9rem;
  text-align: center;
  display: none;
}

.auth-message.error {
  display: block;
  background: #fef2f2;
  color: #b91c1c;
  border: 1px solid #fecaca;
}

.auth-message.success {
  display: block;
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #bbf7d0;
}

/* Callback */
.callback-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
}

.callback-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  max-width: 400px;
  width: 92%;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1.5rem;
}

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

/* User center */
.user-card {
  max-width: 520px;
  margin: 0 auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  text-align: center;
}

.user-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-border);
  margin-bottom: 1rem;
}

.user-avatar-placeholder {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  margin: 0 auto 1rem;
}

.user-name {
  margin: 0 0 0.25rem;
  font-size: 1.4rem;
}

.user-meta {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.user-info-list {
  text-align: left;
  border-top: 1px solid var(--color-border);
  padding-top: 1.25rem;
  margin-bottom: 1.5rem;
}

.user-info-item {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  font-size: 0.95rem;
}

.user-info-item .label {
  color: var(--color-text-muted);
}

/* Responsive */
@media (max-width: 640px) {
  .site-nav {
    gap: 1rem;
    font-size: 0.9rem;
  }

  .hero {
    padding: 3.5rem 0 3rem;
  }

  .section {
    padding: 2.5rem 0;
  }

  .auth-card {
    padding: 2rem 1.25rem;
  }
}