/* ============================================================
   原构工坊 设计系统 — Components
   按钮 / 导航 / 卡片 / 标签 / 页脚 / 表单 / 演示组件
   ============================================================ */

/* ==================== 按钮系统（胶囊风格） ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 28px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: transform var(--dur-fast) var(--ease-standard),
              box-shadow var(--dur-fast) var(--ease-standard),
              background var(--dur-fast) var(--ease-standard),
              color var(--dur-fast) var(--ease-standard),
              border-color var(--dur-fast) var(--ease-standard);
}

.btn svg { width: 16px; height: 16px; flex: none; }

/* 主按钮：黑色胶囊（参照站标志性按钮） */
.btn--primary {
  background: var(--ink-1);
  color: #fff;
}

.btn--primary:hover {
  background: #23262e;
  transform: translateY(-1px);
  box-shadow: var(--shadow-btn);
}

.btn--primary:active { transform: translateY(0) scale(0.98); }

/* 次级按钮：白底灰边胶囊 */
.btn--secondary {
  background: #fff;
  color: var(--ink-1);
  border: 1px solid var(--line-strong);
}

.btn--secondary:hover {
  border-color: var(--ink-1);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* 强调按钮：蓝紫 */
.btn--accent {
  background: var(--accent);
  color: #fff;
}

.btn--accent:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(97, 92, 237, 0.35);
}

/* 幽灵按钮（深色背景上） */
.btn--ghost-light {
  background: rgba(255, 255, 255, 0.1);
  color: var(--ink-inverse);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(8px);
}

.btn--ghost-light:hover { background: rgba(255, 255, 255, 0.18); }

.btn--sm { height: 38px; padding: 0 18px; font-size: 13.5px; }
.btn--lg { height: 54px; padding: 0 34px; font-size: 16px; }
.btn--block { width: 100%; }

/* 文字链接按钮：带箭头 */
.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  transition: gap var(--dur-fast) var(--ease-standard);
}

.btn-link:hover { gap: 10px; }
.btn-link svg { width: 15px; height: 15px; }

/* ==================== 顶部导航 ==================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(16px) saturate(1.6);
  -webkit-backdrop-filter: blur(16px) saturate(1.6);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-med), box-shadow var(--dur-med);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 4px 24px rgba(16, 24, 40, 0.05);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
  height: var(--nav-h);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  flex: none;
}

/* 品牌 logo（图片版） */
.nav__logo-img {
  height: 30px;
  width: auto;
  display: block;
}

/* 品牌文字（黑色加粗，图形保持原色） */
.nav__logo-text {
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-1);
  letter-spacing: 0.02em;
  line-height: 1;
  white-space: nowrap;
}

.nav__logo-img--footer {
  height: 34px;
}

.nav__logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--gradient-vivid);
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 15px;
  font-weight: 800;
  box-shadow: 0 4px 12px rgba(97, 92, 237, 0.35);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-inline: auto;
}

.nav__links a {
  position: relative;
  padding: 8px 14px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink-2);
  border-radius: var(--radius-pill);
  transition: color var(--dur-fast), background var(--dur-fast);
}

.nav__links a:hover {
  color: var(--ink-1);
  background: var(--bg-secondary);
}

.nav__links a.is-active {
  color: var(--ink-1);
  font-weight: 600;
}

.nav__links a.is-active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  transform: translateX(-50%);
  width: 14px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--gradient-text);
}

.nav__cta { display: flex; align-items: center; gap: var(--sp-3); flex: none; }

/* 移动端汉堡 */
.nav__burger {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  place-items: center;
  color: var(--ink-1);
}

.nav__burger svg { width: 22px; height: 22px; }

.nav__drawer {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  z-index: 99;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--line);
  padding: var(--sp-4) 24px var(--sp-8);
  display: none;
  flex-direction: column;
  gap: 4px;
}

.nav__drawer.is-open { display: flex; }

.nav__drawer a {
  padding: 14px 12px;
  font-size: 16px;
  font-weight: 500;
  border-radius: 12px;
  color: var(--ink-1);
}

.nav__drawer a:active { background: var(--bg-secondary); }
.nav__drawer .btn { margin-top: var(--sp-4); }

/* ==================== 标签 / 徽章 ==================== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 26px;
  padding: 0 12px;
  border-radius: var(--radius-pill);
  background: var(--bg-secondary);
  border: 1px solid var(--line);
  color: var(--ink-2);
  font-size: var(--fs-tiny);
  font-weight: 500;
  white-space: nowrap;
}

.tag--accent {
  background: var(--accent-soft);
  border-color: rgba(97, 92, 237, 0.2);
  color: var(--accent);
}

.tag--dot::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gradient-text);
}

/* 平台官方 logo 徽章：logo + 文字，统一尺寸 */
.tag--brand {
  padding-left: 8px;
  background: #fff;
  border-color: var(--line);
}

.tag .brand-ico,
.tag--brand .brand-ico {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  object-fit: contain;
  flex: none;
  background: #fff;
}

.tag--brand-lg {
  height: 44px;
  padding: 0 16px 0 12px;
  font-size: 14px;
  gap: 8px;
}

.tag--brand-lg .brand-ico {
  width: 22px;
  height: 22px;
  border-radius: 6px;
}

/* ==================== 卡片 ==================== */
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur-med) var(--ease-standard),
              box-shadow var(--dur-med) var(--ease-standard),
              border-color var(--dur-med) var(--ease-standard);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.card__body { padding: var(--sp-6); }

/* ==================== 页脚 ==================== */
.site-footer {
  background: var(--bg-dark);
  color: var(--ink-inverse-2);
  padding: var(--sp-20) 0 var(--sp-10);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(50% 60% at 80% 0%, rgba(97, 92, 237, 0.18), transparent 60%);
  pointer-events: none;
}

.footer-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.4fr repeat(4, 1fr);
  gap: var(--sp-10);
  margin-bottom: var(--sp-16);
}

.footer-brand .nav__logo { color: #fff; margin-bottom: var(--sp-4); }
.footer-brand p { font-size: var(--fs-small); max-width: 280px; line-height: 1.8; }

.footer-col h4 {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: var(--sp-5);
}

.footer-col ul { display: flex; flex-direction: column; gap: 12px; }
.footer-col a { font-size: var(--fs-small); transition: color var(--dur-fast); }
.footer-col a:hover { color: #fff; }

.footer-bottom {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding-top: var(--sp-8);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 13px;
  flex-wrap: wrap;
}

/* ==================== 表单 ==================== */
.field { display: flex; flex-direction: column; gap: 8px; }

.field label {
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--ink-1);
}

.field label .req { color: #f04438; margin-left: 2px; }

.field input,
.field select,
.field textarea {
  width: 100%;
  height: 52px;
  padding: 0 18px;
  border: 1.5px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: #fff;
  font-size: 15px;
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
  appearance: none;
}

.field textarea {
  height: auto;
  min-height: 120px;
  padding: 14px 18px;
  resize: vertical;
}

.field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2.5'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  cursor: pointer;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(97, 92, 237, 0.12);
}

.field input::placeholder,
.field textarea::placeholder { color: var(--ink-3); }

.field .error-msg {
  display: none;
  font-size: 12.5px;
  color: #f04438;
}

.field.has-error input,
.field.has-error select,
.field.has-error textarea { border-color: #f04438; }
.field.has-error .error-msg { display: block; }

/* 表单级提交错误提示（如提交失败） */
.form-error {
  margin-top: var(--sp-3);
  font-size: 13px;
  color: #f04438;
}

/* ==================== 模拟演示组件（视频替代视觉） ==================== */
.demo-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
}

.demo-frame__bar {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 38px;
  padding: 0 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--line);
}

.demo-frame__bar i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--line-strong);
}

.demo-frame__bar i:nth-child(1) { background: #ff5f57; }
.demo-frame__bar i:nth-child(2) { background: #febc2e; }
.demo-frame__bar i:nth-child(3) { background: #28c840; }

.demo-frame__bar span {
  margin-left: 10px;
  font-size: 12px;
  color: var(--ink-3);
  font-family: var(--font-mono);
}

/* 播放按钮浮层 */
.play-fab {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, rgba(11, 13, 18, 0) 40%, rgba(11, 13, 18, 0.28));
  transition: background var(--dur-med);
  cursor: pointer;
}

.play-fab__btn {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  display: grid;
  place-items: center;
  box-shadow: 0 12px 40px rgba(11, 13, 18, 0.3);
  transition: transform var(--dur-fast) var(--ease-spring);
}

.play-fab:hover .play-fab__btn { transform: scale(1.08); }
.play-fab__btn svg { width: 26px; height: 26px; color: var(--ink-1); margin-left: 3px; }

/* 模拟对话气泡（AI 工作过程） */
.chat-sim { display: flex; flex-direction: column; gap: 12px; padding: 20px; }

.chat-sim__msg {
  max-width: 82%;
  padding: 12px 16px;
  border-radius: 16px;
  font-size: 13.5px;
  line-height: 1.65;
}

.chat-sim__msg--user {
  align-self: flex-end;
  background: var(--ink-1);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.chat-sim__msg--ai {
  align-self: flex-start;
  background: var(--bg-secondary);
  color: var(--ink-1);
  border-bottom-left-radius: 4px;
}

.chat-sim__msg--ai .ai-name {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 6px;
}

.chat-sim__msg--ai .ai-name::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-text);
}

/* 模拟步骤流 */
.flow-steps { display: flex; flex-direction: column; gap: 10px; padding: 20px; }

.flow-steps__item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--bg-secondary);
  font-size: 13.5px;
  font-weight: 500;
}

.flow-steps__item .dot {
  width: 22px;
  height: 22px;
  flex: none;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 11px;
  font-weight: 700;
  color: #fff;
  background: var(--gradient-vivid);
}

.flow-steps__item.is-done .dot { background: var(--accent-2); }

/* ==================== 选项卡 ==================== */
.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tabs__btn {
  height: 40px;
  padding: 0 20px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-2);
  background: var(--bg-secondary);
  border: 1px solid transparent;
  transition: all var(--dur-fast) var(--ease-standard);
}

.tabs__btn:hover { color: var(--ink-1); }

.tabs__btn.is-active {
  background: var(--ink-1);
  color: #fff;
  font-weight: 600;
}

/* ==================== 统计数字 ==================== */
.stat__num {
  font-size: clamp(34px, 4vw, 48px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat__label {
  margin-top: 6px;
  font-size: var(--fs-small);
  color: var(--ink-2);
}

/* ==================== 视频弹层 ==================== */
.video-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  background: rgba(11, 13, 18, 0.6);
  backdrop-filter: blur(10px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-med) var(--ease-standard);
  padding: 24px;
}

.video-modal.is-open { opacity: 1; pointer-events: auto; }

.video-modal__box {
  position: relative;
  width: min(880px, 100%);
  transform: translateY(16px) scale(0.97);
  transition: transform var(--dur-med) var(--ease-spring);
}

.video-modal.is-open .video-modal__box { transform: none; }

.video-modal__screen {
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(70% 80% at 20% 15%, rgba(97, 92, 237, 0.35), transparent 55%),
    radial-gradient(60% 70% at 85% 85%, rgba(47, 191, 160, 0.28), transparent 55%),
    var(--bg-dark);
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  padding: 24px;
}

.video-modal__title { font-size: 18px; font-weight: 700; }
.video-modal__hint { font-size: 13px; color: var(--ink-inverse-2); }

.video-modal__close {
  position: absolute;
  top: -14px;
  right: -14px;
  z-index: 2;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #fff;
  color: var(--ink-1);
  font-size: 20px;
  line-height: 1;
  box-shadow: var(--shadow-md);
  transition: transform var(--dur-fast);
}

.video-modal__close:hover { transform: scale(1.08); }

/* ==================== 响应式 ==================== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--sp-8); }
}

@media (max-width: 860px) {
  .nav__links { display: none; }
  .nav__cta .btn--secondary { display: none; }
  .nav__burger { display: grid; }
}

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .btn { height: 46px; padding: 0 22px; }
}