/* Design Tokens */
:root {
  --bg-gradient-start: #F7FAFF;
  --bg-gradient-end: #EDF4FF;
  --surface: #FFFFFF;
  --surface-elevated: rgba(255, 255, 255, 0.92);
  --text-primary: #1A1A2E;
  --text-secondary: #6B7280;
  --text-tertiary: #9CA3AF;
  --accent-blue: #3B82F6;
  --accent-blue-light: #DBEAFE;
  --accent-purple: #8B5CF6;
  --accent-purple-light: #EDE9FE;
  --accent-green: #22C55E;
  --accent-green-light: #DCFCE7;
  --accent-orange: #F97316;
  --accent-orange-light: #FFEDD5;
  --accent-pink: #F43F85;
  --accent-pink-light: #FCE7F3;
  --shadow-soft: 0 4px 24px rgba(59, 130, 246, 0.08);
  --shadow-card: 0 8px 32px rgba(30, 41, 59, 0.06);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --btn-primary-text: #0011ff;
  --btn-primary-border: #8b93f8;
  --btn-primary-shadow: #1f35ff;
  --btn-active-border: #646fff;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-top: env(safe-area-inset-top, 0px);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-gradient-start: #0F172A;
    --bg-gradient-end: #1E293B;
    --surface: rgba(30, 41, 59, 0.85);
    --surface-elevated: rgba(15, 23, 42, 0.88);
    --text-primary: #F8FAFC;
    --text-secondary: #CBD5E1;
    --text-tertiary: #94A3B8;
    --shadow-soft: 0 4px 24px rgba(0, 0, 0, 0.25);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
    --btn-primary-text: #818cf8;
    --btn-primary-border: #6366f1;
    --btn-primary-shadow: #4338ca;
    --btn-active-border: #4f46e5;
  }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.5;
  color: var(--text-primary);
  background: linear-gradient(180deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
  min-height: 100vh;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app-shell {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  min-height: 100dvh;
  position: relative;
  overflow-x: hidden;
}

@media (min-width: 768px) {
  .app-shell { max-width: 520px; padding: 24px 0; }
}


/* Cards */
.card-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 24px 16px;
}

.card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 16px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  pointer-events: none;
  background: radial-gradient(circle at 90% 50%, var(--card-tint) 0%, transparent 70%);
}

.card:hover,
.card:focus-visible {
  transform: translateY(-3px) scale(1.01);
  box-shadow: 0 12px 40px rgba(30, 41, 59, 0.12);
  outline: none;
}

.card:active { transform: scale(0.985); }

.card__icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  position: relative;
  z-index: 1;
  background: linear-gradient(135deg, var(--icon-bg-start) 0%, var(--icon-bg-end) 100%);
  box-shadow: 0 8px 20px var(--icon-shadow);
}

.card__icon svg { width: 28px; height: 28px; color: #fff; }

.card__body {
  flex: 1;
  min-width: 0;
  position: relative;
  z-index: 1;
}

.card__title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.card__desc {
  margin-top: 4px;
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card__tag {
  display: inline-flex;
  margin-top: 8px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  background: var(--tag-bg);
  color: var(--tag-text);
}

.card__arrow {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface-elevated);
  display: grid;
  place-items: center;
  position: relative;
  z-index: 1;
  color: var(--arrow-color);
  transition: transform 0.2s ease, background 0.2s ease;
}

.card__arrow::after {
  content: "";
  display: block;
  width: 8px;
  height: 8px;
  border-right: 2.5px solid currentColor;
  border-top: 2.5px solid currentColor;
  transform: rotate(45deg) translateX(-1px);
}

.card:hover .card__arrow,
.card:focus-visible .card__arrow { transform: translateX(3px); background: var(--surface); }

/* Per-card themes */
.card--blue   { --card-tint: #BFDBFE; --icon-bg-start: #60A5FA; --icon-bg-end: #3B82F6; --icon-shadow: rgba(59, 130, 246, 0.35); --tag-bg: var(--accent-blue-light); --tag-text: var(--accent-blue); --arrow-color: var(--accent-blue); }
.card--purple { --card-tint: #DDD6FE; --icon-bg-start: #A78BFA; --icon-bg-end: #8B5CF6; --icon-shadow: rgba(139, 92, 246, 0.35); --tag-bg: var(--accent-purple-light); --tag-text: var(--accent-purple); --arrow-color: var(--accent-purple); }
.card--green  { --card-tint: #BBF7D0; --icon-bg-start: #4ADE80; --icon-bg-end: #22C55E; --icon-shadow: rgba(34, 197, 94, 0.35); --tag-bg: var(--accent-green-light); --tag-text: var(--accent-green); --arrow-color: var(--accent-green); }
.card--orange { --card-tint: #FED7AA; --icon-bg-start: #FB923C; --icon-bg-end: #F97316; --icon-shadow: rgba(249, 115, 22, 0.35); --tag-bg: var(--accent-orange-light); --tag-text: var(--accent-orange); --arrow-color: var(--accent-orange); }
.card--pink   { --card-tint: #FBCFE8; --icon-bg-start: #FB7185; --icon-bg-end: #F43F85; --icon-shadow: rgba(244, 63, 133, 0.35); --tag-bg: var(--accent-pink-light); --tag-text: var(--accent-pink); --arrow-color: var(--accent-pink); }


/* Button style applied to feature cards */
.card.button {
  cursor: pointer;
  color: var(--btn-primary-text);
  background-color: var(--surface);
  padding: 0.8em 2.2em;
  border-radius: 50em;
  border: 6px solid var(--btn-primary-border);
  box-shadow: 0px 8px var(--btn-primary-shadow);
}

.card.button::before {
  content: none;
}

.card.button .card__icon {
  background: var(--surface);
  color: var(--btn-primary-text);
}

.card.button .card__icon svg {
  color: var(--btn-primary-text);
}

.card.button:active {
  border-color: var(--btn-active-border);
  box-shadow: none;
  transform: scale(0.985) translateY(8px);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Focus visible for accessibility */
:focus-visible { outline: 2px solid var(--accent-blue); outline-offset: 2px; }