/* ============================================
   联系我们 (contact.html)
   ============================================ */

/* ====== HERO ====== */
.contact-hero {
  padding: 120px 0 64px;
  text-align: center;
  position: relative;
}
.contact-hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 180, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.contact-hero > .container {
  position: relative;
  z-index: 1;
}
.contact-hero-title {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}
.contact-hero-title em {
  font-style: normal;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.contact-hero-lead {
  font-size: 18px;
  color: var(--text-3);
  max-width: 600px;
  margin: 0 auto;
}

/* ====== CHANNEL GRID ====== */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.channel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 28px;
  text-align: center;
  transition: all 0.2s;
  position: relative;
  display: flex;
  flex-direction: column;
}
.channel:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}
.channel-icon {
  font-size: 36px;
  margin-bottom: 16px;
  filter: grayscale(0.2);
}
.channel h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.channel-main {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 6px;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
.channel-sub {
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 20px;
}
.channel-tip {
  font-size: 12px;
  color: var(--accent);
  margin-top: 12px;
  margin-bottom: 0;
  padding: 8px 12px;
  background: var(--tag-bg);
  border-radius: 8px;
}
.channel .btn {
  margin-top: auto;
}

/* ====== FORM (two-column) ====== */
.form-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  max-width: 1080px;
  margin: 0 auto;
}
.form-side {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
}
.form-side h2 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.form-side-lead {
  font-size: 15px;
  color: var(--text-3);
  margin-bottom: 32px;
  line-height: 1.6;
}
.form-side-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-side-item {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 16px;
  align-items: start;
}
.form-side-num {
  width: 36px;
  height: 36px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-mono);
}
.form-side-item h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-1);
}
.form-side-item p {
  font-size: 13px;
  color: var(--text-3);
  line-height: 1.6;
  margin: 0;
}

/* ====== FORM ====== */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  border-radius: 16px;
  padding: 40px;
  position: relative;
  box-shadow: 0 0 0 1px rgba(0, 180, 255, 0.04);
}
.contact-form::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-accent);
  border-radius: 16px 16px 0 0;
}
.contact-form h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 28px;
}
.contact-form label {
  display: block;
  margin-bottom: 18px;
}
.contact-form label > span {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: 8px;
}
.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-1);
  font-size: 14px;
  font-family: inherit;
  transition: all 0.15s;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--bg-card-hover);
  box-shadow: 0 0 0 3px rgba(0, 180, 255, 0.10);
}
.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--text-3);
  opacity: 0.6;
}
.contact-form select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23999' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}
.contact-form textarea {
  resize: vertical;
  min-height: 110px;
  font-family: inherit;
}
.contact-form button[type="submit"] {
  margin-top: 8px;
  width: 100%;
}
.form-status {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 13px;
  text-align: center;
  display: none;
}
.form-status.success {
  display: block;
  background: rgba(0, 180, 255, 0.08);
  border: 1px solid var(--accent);
  color: var(--accent);
}
.form-status.error {
  display: block;
  background: rgba(230, 0, 18, 0.08);
  border: 1px solid var(--brand);
  color: var(--brand);
}

/* ====== INFO GRID ====== */
.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  transition: all 0.2s;
}
.info-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}
.info-icon {
  font-size: 24px;
  margin-bottom: 12px;
}
.info-card h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}
.info-card p {
  font-size: 14px;
  color: var(--text-1);
  line-height: 1.6;
}
.info-card a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}
.info-card a:hover {
  border-bottom-color: var(--accent);
}

/* ====== MOBILE ====== */
@media (max-width: 768px) {
  .contact-hero { padding: 96px 0 48px; }
  .contact-hero-title { font-size: 36px; }
  .channel-grid { grid-template-columns: 1fr; gap: 16px; }
  .form-wrap { grid-template-columns: 1fr; gap: 24px; }
  .form-side { padding: 28px; }
  .contact-form { padding: 28px; }
  .info-grid { grid-template-columns: 1fr; }
}