/* ========================================
   PHIBA · 温暖文艺风设计系统
   ======================================== */

:root {
  /* —— 色板 —— */
  --paper:        #faf6ef;   /* 纸张底色 */
  --paper-warm:   #f3ebde;   /* 略深纸色 */
  --paper-deep:   #e8dcc5;   /* 边角阴影 */
  --ink:          #2d1f12;   /* 主文字 */
  --ink-soft:     #5a4a37;   /* 次文字 */
  --ink-mute:     #8b7a64;   /* 浅文字 */
  --fur:          #d97f4a;   /* PHIBA 毛色橙 */
  --fur-deep:     #b66335;   /* 深橙 */
  --fur-soft:     #f0c19a;   /* 浅橙 */
  --cloud:        #f5f1ea;   /* 云朵白 */
  --gold:         #c89b5e;   /* 温暖金 */
  --line:         #d8c9af;   /* 分割线 */

  /* —— 字体 —— */
  --font-serif:  "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
  --font-sans:   "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display:"Cormorant Garamond", "Noto Serif SC", serif;

  /* —— 尺寸 —— */
  --max-w:       1180px;
  --gap:         2rem;
  --radius:      14px;
  --shadow-soft: 0 8px 32px rgba(120, 80, 40, 0.08);
  --shadow-card: 0 14px 40px rgba(120, 80, 40, 0.12);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
  /* 纸张纹理 */
  background-image:
    radial-gradient(circle at 20% 30%, rgba(217, 127, 74, 0.04) 0, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(200, 155, 94, 0.05) 0, transparent 40%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--fur-deep);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease;
  border-bottom: 1px solid transparent;
}
a:hover { color: var(--fur); border-bottom-color: var(--fur); }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ========================================
   顶部导航
   ======================================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 246, 239, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(216, 201, 175, 0.5);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  max-width: var(--max-w);
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: .08em;
  color: var(--ink);
  border: none;
}
.brand:hover { color: var(--fur-deep); border: none; }
.brand-dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--fur);
  box-shadow: 0 0 0 4px rgba(217, 127, 74, 0.18);
}
.nav-menu {
  display: flex;
  gap: 1.8rem;
  list-style: none;
}
.nav-menu a {
  color: var(--ink-soft);
  font-size: .95rem;
  border: none;
  position: relative;
  padding: .25rem 0;
}
.nav-menu a:hover { color: var(--fur-deep); border: none; }
.nav-menu a::after {
  content: "";
  position: absolute;
  left: 50%; bottom: -4px;
  width: 4px; height: 4px;
  background: var(--fur);
  border-radius: 50%;
  opacity: 0;
  transform: translateX(-50%);
  transition: opacity .25s;
}
.nav-menu a:hover::after { opacity: 1; }

/* ========================================
   Hero 区
   ======================================== */
.hero {
  padding: 4rem 1.5rem 3rem;
  text-align: center;
  position: relative;
}
.hero-figure {
  margin: 0 auto 2rem;
  max-width: 720px;
  position: relative;
}
.hero-figure img {
  display: block;
  width: 100%;
  max-width: 640px;
  height: auto;
  margin: 0 auto;
  filter: drop-shadow(0 24px 50px rgba(120, 80, 40, .18));
  animation: floaty 6s ease-in-out infinite;
}
.hero .tagline {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--ink-soft);
  letter-spacing: .25em;
  margin-bottom: 1rem;
}
.hero-sub {
  font-family: var(--font-serif);
  font-size: clamp(.95rem, 1.5vw, 1.1rem);
  color: var(--ink-mute);
  line-height: 1.85;
  max-width: 32em;
  margin: 0 auto;
}

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}

/* ========================================
   通用 section
   ======================================== */
section { padding: 5rem 0; }

.section-head {
  text-align: center;
  margin-bottom: 4rem;
}
.section-head .kicker {
  font-family: var(--font-serif);
  font-size: .8rem;
  letter-spacing: .35em;
  color: var(--fur-deep);
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.section-head h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(2rem, 4.5vw, 3rem);
  color: var(--ink);
  line-height: 1.2;
  margin-bottom: 1rem;
}
.section-head .lede {
  max-width: 640px;
  margin: 0 auto;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

/* ========================================
   About PHIBA - 双栏叙事
   ======================================== */
.about {
  background: var(--paper-warm);
}
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.about-text .lead {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  line-height: 1.85;
  color: var(--ink);
  margin-bottom: 1.5rem;
}
.about-text p {
  color: var(--ink-soft);
  margin-bottom: 1.2rem;
}
.about-text .quote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--fur-deep);
  border-left: 3px solid var(--fur);
  padding: .8rem 0 .8rem 1.4rem;
  margin: 1.8rem 0;
}
.about-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: var(--shadow-soft);
}
.about-card .row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 1rem 0;
  border-bottom: 1px dashed var(--line);
}
.about-card .row:last-child { border-bottom: none; }
.about-card .label {
  font-family: var(--font-serif);
  color: var(--ink-mute);
  font-size: .9rem;
  letter-spacing: .15em;
}
.about-card .value {
  font-family: var(--font-serif);
  color: var(--ink);
  font-weight: 500;
  text-align: right;
}
.about-card .p-letters {
  display: flex;
  gap: .8rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}
.about-card .p-letter {
  flex: 1;
  text-align: center;
  padding: .9rem .4rem;
  background: var(--paper-warm);
  border-radius: 8px;
}
.about-card .p-letter .char {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--fur);
}
.about-card .p-letter .word {
  font-size: .75rem;
  color: var(--ink-mute);
  letter-spacing: .1em;
  margin-top: .25rem;
}

/* ========================================
   Philosophy - 大字标语
   ======================================== */
.philosophy {
  text-align: center;
  padding: 7rem 0;
  background:
    radial-gradient(ellipse at center, rgba(217, 127, 74, 0.08) 0, transparent 70%);
}
.philosophy blockquote {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink);
  max-width: 900px;
  margin: 0 auto;
  letter-spacing: .05em;
}
.philosophy blockquote em {
  color: var(--fur-deep);
  font-style: italic;
}
.philosophy .signature {
  margin-top: 3rem;
  font-family: var(--font-serif);
  color: var(--ink-mute);
  letter-spacing: .3em;
  font-size: .9rem;
}

/* ========================================
   App 展示卡片
   ======================================== */
.apps {
  background: var(--paper);
}
.app-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  align-items: center;
  background: linear-gradient(145deg, var(--paper) 0%, var(--paper-warm) 100%);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 3rem;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}
.app-card::before {
  content: "";
  position: absolute;
  top: -50%; right: -20%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(217, 127, 74, 0.12) 0, transparent 70%);
  pointer-events: none;
}
.app-icon-wrap {
  position: relative;
  z-index: 1;
}
.app-icon-wrap img {
  width: 240px;
  height: 240px;
  border-radius: 56px; /* iOS 风格圆角 */
  box-shadow:
    0 20px 50px rgba(120, 80, 40, 0.22),
    0 0 0 1px rgba(255, 255, 255, 0.4) inset;
  transition: transform .4s ease;
}
.app-icon-wrap img:hover { transform: scale(1.04) rotate(-2deg); }
.app-icon-wrap .badge {
  position: absolute;
  bottom: -10px; right: -10px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-serif);
  font-size: .75rem;
  letter-spacing: .15em;
  padding: .35rem .85rem;
  border-radius: 999px;
}

.app-info { position: relative; z-index: 1; }
.app-info .label {
  font-family: var(--font-serif);
  font-size: .85rem;
  letter-spacing: .3em;
  color: var(--fur-deep);
  margin-bottom: 1rem;
}
.app-info h3 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3.5vw, 2.6rem);
  color: var(--ink);
  margin-bottom: 1rem;
  letter-spacing: .03em;
}
.app-info p {
  color: var(--ink-soft);
  font-size: 1.05rem;
  line-height: 1.85;
  margin-bottom: 1.5rem;
}
.app-info .highlight {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--fur-deep);
  border-left: 3px solid var(--fur);
  padding-left: 1.2rem;
  margin: 1.8rem 0;
}
.app-features {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin: 1.8rem 0;
}
.app-features .chip {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .5rem 1rem;
  font-size: .9rem;
  color: var(--ink-soft);
}
.app-features .chip::before {
  content: "•";
  color: var(--fur);
  margin-right: .5rem;
}
.app-cta {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  margin-top: 1.5rem;
  padding: .9rem 1.8rem;
  background: var(--ink);
  color: var(--paper);
  border: none;
  border-radius: 999px;
  font-family: var(--font-serif);
  font-size: 1rem;
  letter-spacing: .12em;
  transition: transform .2s, background .2s;
}
.app-cta:hover {
  background: var(--fur-deep);
  color: var(--paper);
  border: none;
  transform: translateY(-2px);
}
.app-cta .arrow { font-family: var(--font-display); }

.app-legal {
  margin-top: 1.2rem;
  font-size: .85rem;
  color: var(--ink-mute);
  display: flex;
  gap: .6rem;
  align-items: center;
}
.app-legal a {
  color: var(--ink-mute);
  border-bottom: 1px dashed var(--line);
}
.app-legal a:hover { color: var(--fur-deep); border-bottom-color: var(--fur-deep); }

/* ========================================
   Footer
   ======================================== */
footer {
  background: var(--ink);
  color: var(--paper-warm);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(245, 241, 234, 0.15);
}
.footer-brand .name {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  letter-spacing: .12em;
  margin-bottom: .8rem;
}
.footer-brand .name .accent { color: inherit; font-style: normal; }
.footer-brand .footer-logo {
  display: block;
  height: 38px;
  width: auto;
  margin-bottom: .8rem;
  filter: invert(1) brightness(.9);
}
.footer-brand .motto {
  font-family: var(--font-serif);
  color: var(--paper-deep);
  letter-spacing: .2em;
  font-size: .85rem;
}
.footer-links h4 {
  font-family: var(--font-serif);
  font-size: .9rem;
  letter-spacing: .25em;
  color: var(--paper-deep);
  margin-bottom: 1.2rem;
  text-transform: uppercase;
}
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: .7rem; }
.footer-links a {
  color: var(--paper-warm);
  border: none;
  font-size: .95rem;
}
.footer-links a:hover { color: var(--fur-soft); border: none; }
.footer-bottom {
  margin-top: 2rem;
  text-align: center;
  font-size: .85rem;
  color: var(--ink-mute);
  letter-spacing: .1em;
}
.footer-bottom a {
  color: var(--ink-mute);
  border: none;
}
.footer-bottom a:hover { color: var(--fur-soft); border: none; }

/* ========================================
   内页通用 (terms / privacy)
   ======================================== */
.page-hero {
  padding: 5rem 1.5rem 2rem;
  text-align: center;
}
.page-hero .crumb {
  font-family: var(--font-serif);
  font-size: .8rem;
  letter-spacing: .3em;
  color: var(--ink-mute);
  margin-bottom: 1.5rem;
}
.page-hero .crumb a {
  color: var(--ink-mute);
  border: none;
}
.page-hero .crumb a:hover { color: var(--fur-deep); border: none; }
.page-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 6vw, 4rem);
  color: var(--ink);
  margin-bottom: 1rem;
  letter-spacing: .05em;
}
.page-hero .meta {
  font-family: var(--font-serif);
  color: var(--ink-mute);
  font-size: .95rem;
  letter-spacing: .15em;
}

.doc {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}
.doc h2 {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  color: var(--ink);
  margin: 2.8rem 0 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}
.doc h2:first-of-type { border-top: none; padding-top: 0; }
.doc h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--ink);
  margin: 1.8rem 0 .8rem;
  font-weight: 600;
}
.doc p {
  color: var(--ink-soft);
  margin-bottom: 1.1rem;
  line-height: 1.85;
}
.doc ul {
  color: var(--ink-soft);
  margin: 1rem 0 1.2rem 1.4rem;
  line-height: 1.85;
}
.doc ul li { margin-bottom: .5rem; }

/* 权限表格 */
.perm-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: .95rem;
  background: var(--paper);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}
.perm-table th,
.perm-table td {
  padding: .85rem 1.1rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
  line-height: 1.6;
}
.perm-table thead th {
  font-family: var(--font-serif);
  background: var(--paper-warm);
  color: var(--ink);
  font-weight: 600;
  letter-spacing: .08em;
}
.perm-table tbody td { color: var(--ink-soft); }
.perm-table tbody tr:last-child td { border-bottom: none; }
.perm-table tbody tr:hover td { background: rgba(217, 127, 74, 0.04); }
@media (max-width: 540px) {
  .perm-table { font-size: .85rem; }
  .perm-table th, .perm-table td { padding: .6rem .7rem; }
}
.doc .placeholder {
  background: linear-gradient(135deg, var(--paper-warm) 0, var(--paper) 100%);
  border: 1px dashed var(--gold);
  border-radius: 12px;
  padding: 1.6rem 1.8rem;
  margin: 1.5rem 0;
  font-family: var(--font-serif);
  color: var(--ink-soft);
  font-style: italic;
}
.doc .placeholder::before {
  content: "✎ 待填";
  display: inline-block;
  font-style: normal;
  font-size: .8rem;
  letter-spacing: .2em;
  color: var(--gold);
  margin-bottom: .5rem;
}
.doc a.back {
  display: inline-block;
  margin-top: 2rem;
  font-family: var(--font-serif);
  color: var(--ink-mute);
  border: none;
  font-size: .95rem;
  letter-spacing: .15em;
}
.doc a.back:hover { color: var(--fur-deep); border: none; }

/* ========================================
   响应式
   ======================================== */
@media (max-width: 880px) {
  .nav-inner { padding: .85rem 1.2rem; }
  .nav-menu { gap: 1.1rem; }
  .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .app-card {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 2rem 1.4rem;
  }
  .app-icon-wrap { margin: 0 auto; }
  .app-icon-wrap img { width: 170px; height: 170px; border-radius: 42px; }
  .app-info .highlight {
    border-left: none;
    padding-left: 0;
    max-width: 26em;
    margin-left: auto;
    margin-right: auto;
  }
  .app-features { justify-content: center; }
  .app-cta { width: 100%; justify-content: center; }
  .app-legal { justify-content: center; flex-wrap: wrap; }
  .footer-top { flex-direction: column; gap: 2.2rem; }
  section { padding: 3.5rem 0; }
  .section-head { margin-bottom: 2.6rem; }
  .hero { padding: 3.2rem 1rem 2.6rem; }
  .philosophy { padding: 4.5rem 0; }
  .philosophy .signature { margin-top: 2rem; }
  footer { padding: 3rem 0 1.6rem; margin-top: 2.5rem; }
}

@media (max-width: 540px) {
  /* 导航：不隐藏，改为居中换行，保证条款/隐私可达 */
  .nav-inner {
    flex-wrap: wrap;
    justify-content: center;
    gap: .35rem .8rem;
    padding: .7rem 1rem;
  }
  .brand { font-size: 1.05rem; }
  .nav-menu { gap: .85rem 1.1rem; flex-wrap: wrap; justify-content: center; }
  .nav-menu a { font-size: .85rem; }

  /* Hero */
  .hero { padding: 2.4rem 1.1rem 2rem; }
  .hero-figure { margin-bottom: 1.5rem; }
  .hero-figure img { max-width: 92%; }
  .hero .tagline { font-size: 1rem; letter-spacing: .18em; }
  .hero-sub { font-size: .95rem; }

  /* About */
  .about-text .lead { font-size: 1.15rem; }
  .about-text .quote { font-size: 1.02rem; padding: .6rem 0 .6rem 1.1rem; }
  .about-card { padding: 1.6rem 1.2rem; }
  .about-card .p-letters { gap: .5rem; }
  .about-card .p-letter { padding: .7rem .2rem; }
  .about-card .p-letter .char { font-size: 1.5rem; }

  /* Philosophy */
  .philosophy blockquote { font-size: 1.45rem; letter-spacing: .02em; }

  /* App 卡片 */
  .app-card { padding: 1.6rem 1.1rem; }
  .app-icon-wrap img { width: 148px; height: 148px; border-radius: 36px; }
  .app-icon-wrap .badge { font-size: .68rem; right: 50%; transform: translateX(50%); bottom: -8px; white-space: nowrap; }
  .app-info h3 { font-size: 1.7rem; }
  .app-info p { font-size: .98rem; }
  .app-features .chip { font-size: .82rem; padding: .4rem .8rem; }
  .app-cta { padding: .85rem 1.4rem; font-size: .95rem; }

  /* Footer */
  .footer-top { gap: 1.8rem; padding-bottom: 2.2rem; }
  .footer-brand .footer-logo { height: 32px; }
  .footer-bottom { font-size: .78rem; }

  /* 内页（条款/隐私） */
  .page-hero { padding: 3rem 1.1rem 1.2rem; }
  .page-hero h1 { font-size: 1.8rem; }
  .page-hero .meta { font-size: .85rem; letter-spacing: .08em; }
  .doc { padding: 1.8rem 1.1rem 3.2rem; }
  .doc h2 { font-size: 1.28rem; margin: 2.2rem 0 .9rem; }
  .doc h3 { font-size: 1.08rem; }
  .doc p, .doc ul { font-size: .95rem; }

  /* 触屏：加大点按热区 */
  .nav-menu a { padding: .45rem .1rem; }
  .footer-links a { display: inline-block; padding: .3rem 0; }
  .doc a.back { padding: .5rem 0; }
}

/* 权限表格在窄屏横向滚动，不挤压换行 */
@media (max-width: 540px) {
  .perm-table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
}