/* ==========================================================================
   首页（index.html）：Hero + 创建房间 / 加入房间
   ========================================================================== */
.hero {
  padding: 64px 0 28px;
  text-align: center;
}

.hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 14px;
  font-size: 12px;
  color: var(--color-primary-hover);
  background: var(--color-primary-soft);
  border-radius: var(--radius-pill);
}

.hero__title {
  margin-top: 18px;
  font-size: 40px;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.hero__title em {
  font-style: normal;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__desc {
  max-width: 620px;
  margin: 16px auto 0;
  font-size: 15px;
  color: var(--color-text-muted);
}

.panel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin: 36px 0 10px;
}

.panel {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 26px;
  background: rgba(24, 33, 66, 0.86);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.panel:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
}

.panel__icon {
  width: 46px;
  height: 46px;
  margin-bottom: 16px;
  display: grid;
  place-items: center;
  font-size: 22px;
  color: #fff;
  border-radius: var(--radius-md);
  background: var(--gradient-brand);
}

.panel__title {
  font-size: 18px;
  font-weight: 600;
}

.panel__desc {
  margin: 8px 0 20px;
  font-size: 13px;
  color: var(--color-text-muted);
  flex: 1;
}

.panel__form {
  margin-top: auto;
}

/* 房间号输入框内的快捷校验提示 */
.panel .field:last-of-type {
  margin-bottom: 18px;
}

.inline-status {
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 20px;
  margin-top: 8px;
  font-size: 12px;
  color: var(--color-text-dim);
}

.inline-status.is-error {
  color: var(--color-danger);
}

.inline-status.is-ok {
  color: var(--color-success);
}

/* ---------- 功能特性 ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin: 48px 0 60px;
}

.feature {
  padding: 18px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.feature__icon {
  font-size: 20px;
  color: var(--color-primary-hover);
}

.feature__title {
  margin-top: 10px;
  font-size: 14px;
  font-weight: 600;
}

.feature__desc {
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--color-text-dim);
}

.app-footer {
  margin-top: auto;
  padding: 22px 0 30px;
  font-size: 12px;
  color: var(--color-text-dim);
  border-top: 1px solid var(--color-border);
}

.app-footer__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

@media (max-width: 900px) {
  .panel-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

@media (max-width: 640px) {
  .hero {
    padding: 40px 0 20px;
  }

  .hero__title {
    font-size: 28px;
  }

  .features {
    grid-template-columns: minmax(0, 1fr);
    margin: 32px 0 40px;
  }
}