/* ============================================================
   KeeP Fish — 官网样式表
   ============================================================ */

/* ----- 设计Token ----- */
:root {
  --ocean-dark: #0a1628;
  --ocean-deep: #0d2244;
  --ocean-mid:  #0e4d6e;
  --ocean-teal: #0eb8c5;
  --ocean-aqua: #00d4aa;
  --accent:     #05c9d4;
  --accent2:    #00c9a7;
  --warn:       #f59e0b;
  --purple:     #8b5cf6;
  --white:      #ffffff;
  --gray-50:    #f8fafc;
  --gray-100:   #f1f5f9;
  --gray-200:   #e2e8f0;
  --gray-400:   #94a3b8;
  --gray-600:   #475569;
  --gray-700:   #334155;
  --gray-900:   #0f172a;
  --font-sans:  'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --radius-sm:  8px;
  --radius-md:  16px;
  --radius-lg:  24px;
  --shadow-sm:  0 2px 8px rgba(0,0,0,.08);
  --shadow-md:  0 6px 24px rgba(0,0,0,.12);
  --shadow-lg:  0 16px 48px rgba(0,0,0,.16);
  --nav-h:      72px;
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

/* ---- 重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  color: var(--gray-700);
  background: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ==============================================================
   导航栏
   ============================================================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
  z-index: 1000;
  background: rgba(10,22,40,.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(14,184,197,.15);
  transition: background var(--transition), box-shadow var(--transition);
}
.nav.scrolled {
  background: rgba(10,22,40,.97);
  box-shadow: 0 4px 24px rgba(0,0,0,.3);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon {
  font-size: 2rem;
  line-height: 1;
  filter: drop-shadow(0 0 8px rgba(14,184,197,.6));
}
.brand-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: .02em;
}
.brand-sub {
  font-size: .7rem;
  color: var(--ocean-teal);
  letter-spacing: .06em;
}

.nav-links {
  display: flex;
  gap: 8px;
}
.nav-links a {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: .9rem;
  color: rgba(255,255,255,.75);
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
  background: rgba(14,184,197,.2);
}

.nav-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: 8px;
  background: rgba(255,255,255,.08);
  transition: background var(--transition);
}
.nav-menu-btn:hover { background: rgba(255,255,255,.16); }
.nav-menu-btn span {
  display: block;
  width: 22px; height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

@media (max-width: 768px) {
  .nav-menu-btn { display: flex; }
  .nav-links {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    flex-direction: column;
    background: rgba(10,22,40,.97);
    padding: 20px 24px;
    gap: 4px;
    border-bottom: 1px solid rgba(14,184,197,.2);
    transform: translateY(-10px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a { padding: 12px 16px; border-radius: var(--radius-sm); font-size: 1rem; }
}

/* ==============================================================
   通用 Section 布局
   ============================================================== */
.section {
  padding: 96px 5%;
  position: relative;
}
.section-light { background: var(--white); }
.section-gray  { background: var(--gray-50); }

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 64px;
}
.section-label {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ocean-teal);
  background: rgba(14,184,197,.1);
  border: 1px solid rgba(14,184,197,.25);
  margin-bottom: 16px;
}
.section-label-dark {
  color: var(--ocean-aqua);
  background: rgba(0,212,170,.15);
  border-color: rgba(0,212,170,.3);
}
.section-title {
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.25;
  margin-bottom: 16px;
}
.section-desc {
  font-size: 1.05rem;
  color: var(--gray-600);
  line-height: 1.75;
}

/* ==============================================================
   Hero
   ============================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--nav-h) + 48px) 5% 80px;
  background: linear-gradient(160deg, var(--ocean-dark) 0%, var(--ocean-deep) 40%, var(--ocean-mid) 100%);
  overflow: hidden;
}

/* 气泡背景 */
.hero-bubbles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.bubble {
  position: absolute;
  border-radius: 50%;
  background: rgba(14,184,197,.12);
  border: 1px solid rgba(14,184,197,.2);
  animation: bubbleRise linear infinite;
}
@keyframes bubbleRise {
  0%   { transform: translateY(0) scale(1); opacity: .7; }
  100% { transform: translateY(-120vh) scale(1.2); opacity: 0; }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 820px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  border-radius: 20px;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--ocean-teal);
  background: rgba(14,184,197,.12);
  border: 1px solid rgba(14,184,197,.3);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -.01em;
}
.hero-title .highlight {
  background: linear-gradient(90deg, var(--ocean-teal), var(--ocean-aqua));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: rgba(255,255,255,.7);
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 40px;
}
.hero-tag {
  padding: 6px 16px;
  border-radius: 20px;
  font-size: .85rem;
  color: rgba(255,255,255,.85);
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.15);
  backdrop-filter: blur(4px);
  transition: background var(--transition);
}
.hero-tag:hover { background: rgba(255,255,255,.15); }

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: linear-gradient(135deg, var(--ocean-teal), var(--ocean-aqua));
  color: var(--white);
  box-shadow: 0 8px 24px rgba(14,184,197,.4);
}
.btn-primary:hover { box-shadow: 0 12px 32px rgba(14,184,197,.5); }

.btn-outline {
  color: var(--white);
  border: 2px solid rgba(255,255,255,.4);
  background: rgba(255,255,255,.06);
  backdrop-filter: blur(6px);
}
.btn-outline:hover {
  border-color: rgba(255,255,255,.7);
  background: rgba(255,255,255,.12);
}

.wave-divider {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  line-height: 0;
}
.wave-divider svg { width: 100%; height: 80px; }

.wave-top, .wave-bottom {
  position: absolute; left: 0; right: 0;
  line-height: 0;
}
.wave-top { top: 0; }
.wave-bottom { bottom: 0; }
.wave-top svg, .wave-bottom svg { width: 100%; height: 60px; }

/* ==============================================================
   Features
   ============================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
  max-width: 1200px;
  margin: 0 auto 64px;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}
.feature-icon {
  width: 72px; height: 72px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}
.feature-icon svg { width: 44px; height: 44px; }
.fi-blue   { background: rgba(14,184,197,.1); }
.fi-green  { background: rgba(0,201,167,.1); }
.fi-orange { background: rgba(245,158,11,.1); }
.fi-purple { background: rgba(139,92,246,.1); }

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 12px;
}
.feature-card p { font-size: .93rem; color: var(--gray-600); line-height: 1.7; }

/* 服务亮点 */
.service-banner {
  max-width: 1100px;
  margin: 0 auto;
  background: linear-gradient(135deg, var(--ocean-dark), var(--ocean-deep));
  border-radius: var(--radius-lg);
  padding: 48px 5%;
  box-shadow: var(--shadow-lg);
}
.service-banner-inner {
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 24px;
}
.service-stat { text-align: center; }
.stat-num {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(90deg, var(--ocean-teal), var(--ocean-aqua));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label { font-size: .85rem; color: rgba(255,255,255,.65); }
.service-divider {
  width: 1px; height: 48px;
  background: rgba(255,255,255,.12);
}
@media (max-width: 640px) { .service-divider { display: none; } }

/* ==============================================================
   Solutions
   ============================================================== */
.section-ocean {
  background: linear-gradient(160deg, var(--ocean-deep), var(--ocean-mid));
  padding: 96px 5%;
  position: relative;
}
.section-ocean .section-title { color: var(--white); }
.section-ocean .section-desc  { color: rgba(255,255,255,.65); }

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.solution-card {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  backdrop-filter: blur(8px);
  transition: transform var(--transition), background var(--transition);
}
.solution-card:hover {
  transform: translateY(-4px);
  background: rgba(255,255,255,.1);
}
.solution-icon {
  font-size: 2.2rem;
  margin-bottom: 14px;
  line-height: 1;
}
.solution-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}
.solution-card p { font-size: .88rem; color: rgba(255,255,255,.6); line-height: 1.7; }

/* ==============================================================
   Pet Download
   ============================================================== */
.pet-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  max-width: 1000px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .pet-container { grid-template-columns: 1fr; }
}

.pet-feature-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.pet-feature-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.pf-icon {
  font-size: 1.8rem;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}
.pet-feature-list strong {
  display: block;
  font-size: 1rem;
  color: var(--gray-900);
  margin-bottom: 4px;
}
.pet-feature-list p { font-size: .88rem; color: var(--gray-600); margin: 0; }

/* 下载卡片 */
.pet-download-card {
  background: linear-gradient(145deg, var(--ocean-dark), var(--ocean-deep));
  border: 1px solid rgba(14,184,197,.25);
  border-radius: var(--radius-lg);
  padding: 44px 36px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(10,22,40,.25), inset 0 1px 0 rgba(255,255,255,.06);
}

.pet-fish-anim {
  font-size: 4.5rem;
  margin-bottom: 16px;
  display: block;
  animation: fishBob 3s ease-in-out infinite;
  filter: drop-shadow(0 0 12px rgba(14,184,197,.5));
}
@keyframes fishBob {
  0%, 100% { transform: translateY(0) rotate(-5deg); }
  50% { transform: translateY(-10px) rotate(5deg); }
}

.pet-card-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}
.pet-card-version {
  font-size: .9rem;
  color: var(--ocean-teal);
  font-weight: 600;
  letter-spacing: .04em;
  margin-bottom: 8px;
}
.pet-card-notes {
  font-size: .82rem;
  color: rgba(255,255,255,.45);
  min-height: 1.6em;
  margin-bottom: 28px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 36px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ocean-dark);
  background: linear-gradient(135deg, var(--ocean-teal), var(--ocean-aqua));
  box-shadow: 0 8px 24px rgba(14,184,197,.45);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  cursor: pointer;
  border: none;
  font-family: inherit;
  margin-bottom: 14px;
}
.download-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(14,184,197,.55);
}
.download-btn:disabled {
  opacity: .55;
  cursor: not-allowed;
}

.download-meta {
  display: flex;
  gap: 6px;
  justify-content: center;
  font-size: .78rem;
  color: rgba(255,255,255,.4);
  margin-bottom: 10px;
}

.download-error {
  font-size: .8rem;
  color: #f87272;
  min-height: 1.2em;
  margin-top: 4px;
}

/* ==============================================================
   About / Contact
   ============================================================== */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
  max-width: 1000px;
  margin: 0 auto;
}

.info-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}
.info-card:hover { box-shadow: var(--shadow-md); }

.info-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--gray-100);
}
.info-card-icon { font-size: 1.5rem; }
.info-card-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gray-900);
}

.info-items { display: flex; flex-direction: column; gap: 18px; }
.info-item { display: flex; gap: 14px; align-items: flex-start; }
.info-icon { font-size: 1.2rem; flex-shrink: 0; margin-top: 2px; }
.info-label { font-size: .78rem; color: var(--gray-400); margin-bottom: 3px; text-transform: uppercase; letter-spacing: .04em; }
.info-val { font-size: .95rem; color: var(--gray-700); line-height: 1.6; }
.info-val a { color: var(--ocean-mid); }
.info-val a:hover { color: var(--ocean-teal); text-decoration: underline; }

/* 外部链接 */
.ext-links { display: flex; flex-direction: column; gap: 12px; }
.ext-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  transition: background var(--transition), border-color var(--transition);
}
.ext-link:hover {
  background: rgba(14,184,197,.06);
  border-color: rgba(14,184,197,.3);
}
.ext-link-icon { font-size: 1.4rem; flex-shrink: 0; }
.ext-link-text { flex: 1; }
.ext-link-text strong { display: block; font-size: .95rem; color: var(--gray-900); }
.ext-link-text span  { font-size: .8rem; color: var(--gray-400); }
.ext-link-arrow { font-size: .9rem; color: var(--ocean-teal); opacity: 0; transition: opacity var(--transition); }
.ext-link:hover .ext-link-arrow { opacity: 1; }

/* ==============================================================
   Footer
   ============================================================== */
.footer {
  background: var(--ocean-dark);
  color: rgba(255,255,255,.55);
  padding: 48px 5% 32px;
  text-align: center;
}
.footer-inner { max-width: 800px; margin: 0 auto; }
.footer-brand-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 20px;
}
.footer-logo { font-size: 2rem; }
.footer-brand-name { font-size: 1rem; font-weight: 700; color: var(--white); }
.footer-brand-sub  { font-size: .75rem; color: var(--ocean-teal); letter-spacing: .08em; }
.footer-nav {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.footer-nav a { font-size: .88rem; color: rgba(255,255,255,.5); transition: color var(--transition); }
.footer-nav a:hover { color: var(--ocean-teal); }
.footer-divider-line { border-top: 1px solid rgba(255,255,255,.08); margin-bottom: 20px; }
.footer-address { font-size: .82rem; margin-bottom: 12px; line-height: 1.8; }
.footer-icp {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: .8rem;
  margin-bottom: 10px;
}
.footer-icp a { color: rgba(255,255,255,.45); transition: color var(--transition); }
.footer-icp a:hover { color: var(--ocean-teal); }
.icp-sep { color: rgba(255,255,255,.2); }
.footer-copy { font-size: .75rem; color: rgba(255,255,255,.2); }

/* ==============================================================
   Back to top
   ============================================================== */
.back-top {
  position: fixed;
  bottom: 32px; right: 24px;
  width: 42px; height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--ocean-teal), var(--ocean-aqua));
  color: var(--white);
  font-size: 1.1rem;
  box-shadow: 0 4px 16px rgba(14,184,197,.4);
  display: flex; align-items: center; justify-content: center;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--transition), transform var(--transition);
  pointer-events: none;
  z-index: 900;
}
.back-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* ==============================================================
   Animations
   ============================================================== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .65s ease, transform .65s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}