:root {
  --bg: #0d1117;
  --bg-alt: #111827;
  --panel: #161f2c;
  --text: #e5e7eb;
  --muted: #b6becb;
  --accent: #c4a16b;
  --line: #2b3646;
  --max-width: 1100px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  color: var(--text);
  background: radial-gradient(circle at top right, #1f2937 0%, var(--bg) 45%);
}

.container {
  width: min(var(--max-width), calc(100% - 3rem));
  margin: 0 auto;
}

.hero {
  min-height: 70vh;
  display: grid;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(13, 17, 23, 0.96), rgba(13, 17, 23, 0.78)),
    linear-gradient(35deg, #1f2937, #111827);
}

.hero__inner {
  padding: 7rem 0 5rem;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  font-weight: 600;
}

h1,
h2,
h3 {
  line-height: 1.3;
  margin: 0;
}

h1 {
  font-size: clamp(2rem, 4.4vw, 3.6rem);
  max-width: 16ch;
}

.hero__meta {
  margin-top: 1.25rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--line);
}

.section--alt {
  background: var(--bg-alt);
}

h2 {
  margin-bottom: 1.4rem;
  font-size: clamp(1.45rem, 2.2vw, 2rem);
}

h3 {
  font-size: 1.1rem;
  margin-bottom: 0.7rem;
}

p,
li {
  color: var(--text);
}

ul,
ol {
  margin: 0;
  padding-left: 1.2rem;
}

.grid {
  display: grid;
  gap: 1rem;
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.panel,
.card,
.timeline__item {
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.2rem 1.25rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.card:hover,
.panel:hover,
.timeline__item:hover {
  border-color: rgba(196, 161, 107, 0.6);
}

.timeline {
  list-style: none;
  padding-left: 0;
  margin: 0;
  display: grid;
  gap: 1.1rem;
}

.timeline li {
  position: relative;
  padding-left: 1.6rem;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35rem;
  bottom: -1.1rem;
  width: 2px;
  background: linear-gradient(var(--accent), transparent);
}

.timeline li:last-child::before {
  bottom: 0.35rem;
}

.topic {
  margin: 0 0 0.6rem;
  color: var(--accent);
}

.inline-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem 1.2rem;
}

.form-intro {
  margin: -0.2rem 0 2rem;
  color: var(--muted);
}

.interest-form {
  display: grid;
  gap: 1rem;
}

.form-group {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1.15rem 1.2rem;
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
}

.form-group legend {
  padding: 0 0.35rem;
  color: var(--accent);
  font-weight: 600;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.field {
  display: grid;
  gap: 0.45rem;
}

.field input,
.field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #0d131d;
  color: var(--text);
  padding: 0.7rem 0.75rem;
  font: inherit;
}

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.question {
  margin: 0.15rem 0 0.7rem;
  color: var(--text);
}

.choice-list {
  display: grid;
  gap: 0.45rem;
}

.choice-list label {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  color: var(--text);
}

.choice-list input[type="radio"],
.choice-list input[type="checkbox"] {
  margin-top: 0.34rem;
  accent-color: var(--accent);
}

.submit-btn {
  margin-top: 0.4rem;
  padding: 0.85rem 1.2rem;
  border: 1px solid rgba(196, 161, 107, 0.7);
  border-radius: 10px;
  background: linear-gradient(120deg, rgba(196, 161, 107, 0.2), rgba(196, 161, 107, 0.08));
  color: #f2ece2;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.submit-btn:hover {
  border-color: var(--accent);
}

.form-note {
  margin: -0.2rem 0 0;
  font-size: 0.92rem;
  color: var(--muted);
}

.footer {
  padding: 3rem 0 4rem;
  background: #090d13;
}

.slogan {
  margin: 0.3rem 0;
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
}

.note {
  margin-top: 1.2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 900px) {
  .grid--2,
  .cards,
  .inline-list,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .hero__inner {
    padding: 5.5rem 0 4rem;
  }

  .section {
    padding: 3.5rem 0;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(var(--max-width), calc(100% - 2rem));
  }

  .timeline li {
    padding-left: 1.1rem;
  }
}