/* 全局基础设置 */
*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #050816;
  --bg-card: #0f172a;
  --bg-card-soft: #111827;
  --accent: #22c55e;
  --accent-soft: #38bdf8;
  --alarm: #f97316;
  --danger: #ef4444;
  --text-main: #f9fafb;
  --text-sub: #9ca3af;
  --border-soft: rgba(148, 163, 184, 0.3);
  --radius-lg: 18px;
  --radius-xl: 24px;
  --shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.75);
  --shadow-card: 0 14px 30px rgba(15, 23, 42, 0.7);
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #1e293b 0, #020617 50%, #000 100%);
  color: var(--text-main);
}

/* 页面整体布局 */
.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 32px 24px 24px;
}

/* 顶部标题区域 */
.header {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}

.header-inner {
  max-width: 960px;
  width: 100%;
}

.tagline {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-soft);
  margin: 0 0 6px;
}

.title {
  font-size: clamp(2rem, 3vw, 2.6rem);
  margin: 0 0 8px;
}

.subtitle {
  margin: 0;
  color: var(--text-sub);
  max-width: 680px;
  line-height: 1.5;
  font-size: 0.95rem;
}

/* 主体区域布局：左文字 + 右卡片网格 */
.main {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.6fr);
  gap: 28px;
  max-width: 1120px;
  width: 100%;
  margin: 0 auto;
}

/* 左侧 Concept 文本 */
.intro {
  background: linear-gradient(145deg, #020617, #020617 35%, #0b1120);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-soft);
  padding: 24px 22px 22px;
  box-shadow: var(--shadow-soft);
}

.intro h2 {
  margin: 0 0 12px;
  font-size: 1.25rem;
}

.intro p {
  margin: 0 0 10px;
  color: var(--text-sub);
  line-height: 1.5;
  font-size: 0.95rem;
}

.concept-list {
  margin: 10px 0 14px;
  padding-left: 18px;
  color: var(--text-sub);
  font-size: 0.93rem;
}

.concept-list li + li {
  margin-top: 4px;
}

.intro-note {
  margin-top: 10px;
  font-size: 0.85rem;
  color: #e5e7eb;
  opacity: 0.9;
  border-left: 2px solid var(--accent-soft);
  padding-left: 10px;
}

/* 右侧：三个模式卡片 */
.modes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

/* 每一张卡片样式 */
.mode-card {
  background: radial-gradient(circle at top left, #0b1120 0, #020617 55%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-soft);
  padding: 16px 16px 14px;
  box-shadow: var(--shadow-card);
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

/* 轻微高光 */
.mode-card::before {
  content: "";
  position: absolute;
  inset: -40%;
  background: radial-gradient(circle at top, rgba(148, 163, 184, 0.12), transparent 60%);
  opacity: 0;
  transition: opacity 0.25s ease-out;
  pointer-events: none;
}

.mode-card:hover::before {
  opacity: 1;
}

.mode-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.mode-text {
  margin: 0;
  color: var(--text-sub);
  font-size: 0.85rem;
  line-height: 1.45;
}

.mode-label {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #e5e7eb;
  opacity: 0.85;
}

/* 小场景：圆点 + 波纹的区域 */
.mini-scene {
  width: 150px;
  height: 90px;
  background: radial-gradient(circle at top, #020617 0, #020617 40%, #020617 100%);
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  position: relative;
  overflow: hidden;
}

/* 圆点基础样式 */
.mini-dot {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  background: var(--accent);
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  box-shadow: 0 0 14px rgba(34, 197, 94, 0.8);
}

/* 波纹基础 */
.mini-wave {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
}

/* ========== 模式 1：Notification ========== */

.mode-notification .mini-scene {
  background: radial-gradient(circle at 10% 10%, rgba(56, 189, 248, 0.15), transparent 60%),
              radial-gradient(circle at bottom, #020617 0, #020617 60%, #000 100%);
}

/* 轻微波纹，从中心扩散 */
.mini-wave-soft::before {
  content: "";
  position: absolute;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid rgba(56, 189, 248, 0.6);
  left: 24px;
  top: 24px;
  transform-origin: center;
  animation: soft-pulse 2.4s ease-out infinite;
}

/* 圆点从中间平滑移动到右上角 */
.mode-notification .mini-dot {
  animation: dot-drift 4s ease-in-out infinite alternate;
}

/* ========== 模式 2：Alarm ========== */

.mode-alarm .mini-scene {
  background: radial-gradient(circle at center, rgba(249, 115, 22, 0.2), transparent 60%),
              radial-gradient(circle at bottom, #020617 0, #020617 60%, #000 100%);
}

/* Alarm 圆点上下弹跳 */
.mini-dot-bounce {
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--alarm);
  box-shadow: 0 0 20px rgba(249, 115, 22, 0.85);
  animation: dot-bounce 0.9s ease-in-out infinite;
}

/* Alarm 的心跳波纹 */
.mini-wave-pulse::before,
.mini-wave-pulse::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid rgba(249, 115, 22, 0.6);
  transform: translate(-50%, -50%) scale(0.8);
  opacity: 0;
  animation: alarm-pulse 1.4s ease-out infinite;
}

.mini-wave-pulse::after {
  animation-delay: 0.4s;
}

/* ========== 模式 3：Knocking ========== */

.mode-knock .mini-scene {
  background: radial-gradient(circle at right, rgba(239, 68, 68, 0.16), transparent 50%),
              radial-gradient(circle at bottom, #020617 0, #020617 60%, #000 100%);
}

/* 左侧红色撞击条 */
.mini-bar {
  position: absolute;
  left: -40px;
  top: 0;
  width: 40px;
  height: 100%;
  background: linear-gradient(to right, rgba(239, 68, 68, 0.9), transparent);
  animation: bar-knock 1.6s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

/* 被推开的圆点 */
.mini-dot-push {
  left: 36px;
  transform: translateY(-50%);
  background: #e5e7eb;
  box-shadow: 0 0 16px rgba(239, 68, 68, 0.9);
  animation: dot-push 1.6s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

/* ========== 动画定义 ========== */

/* 通知：柔和扩散波纹 */
@keyframes soft-pulse {
  0% {
    transform: scale(0.8);
    opacity: 0.1;
  }
  40% {
    transform: scale(1.2);
    opacity: 0.8;
  }
  100% {
    transform: scale(1.6);
    opacity: 0;
  }
}

/* 通知：圆点轻轻漂移到右上角 */
@keyframes dot-drift {
  0% {
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
  }
  100% {
    left: 100px;
    top: 24px;
    transform: translateY(0);
  }
}

/* Alarm：上下弹跳 */
@keyframes dot-bounce {
  0% {
    top: 64%;
  }
  50% {
    top: 34%;
  }
  100% {
    top: 64%;
  }
}

/* Alarm：心跳式脉冲波纹 */
@keyframes alarm-pulse {
  0% {
    transform: translate(-50%, -50%) scale(0.7);
    opacity: 0;
  }
  40% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.9;
  }
  100% {
    transform: translate(-50%, -50%) scale(1.3);
    opacity: 0;
  }
}

/* Knocking：红色条冲进来又退回 */
@keyframes bar-knock {
  0% {
    transform: translateX(0);
    opacity: 0;
  }
  35% {
    transform: translateX(40px);
    opacity: 1;
  }
  65% {
    transform: translateX(20px);
    opacity: 0.7;
  }
  100% {
    transform: translateX(0);
    opacity: 0;
  }
}

/* Knocking：圆点被向右猛烈推开再回到原位 */
@keyframes dot-push {
  0% {
    left: 36px;
  }
  30% {
    left: 90px;
  }
  70% {
    left: 110px;
  }
  100% {
    left: 36px;
  }
}

/* 页脚 */
.footer {
  margin-top: 28px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-sub);
}

.footer span {
  color: var(--accent-soft);
}

/* 响应式：窄屏幕时改为上下布局 */
@media (max-width: 840px) {
  .page {
    padding: 20px 14px 18px;
  }

  .main {
    grid-template-columns: 1fr;
  }

  .modes {
    grid-template-columns: 1fr;
  }

  .mode-card {
    grid-template-columns: 1fr;
  }

  .mini-scene {
    justify-self: center;
  }
}

/* 包裹卡片的链接样式 */
.mode-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.mode-link:focus-visible {
  outline: 2px solid var(--accent-soft);
  border-radius: var(--radius-lg);
}