/* ==========================================================================
   qiuyuxu.me —— 个人主页
   配色取自背景画作 Van Gogh《Roses》(1890)：薄荷绿 / 奶油白 / 土金
   ========================================================================== */

:root{
  --ink:        #16261C;
  --ink-soft:   #3A5544;
  --ink-faint:  #5E7767;
  --cream:      #F6F3E9;
  --white:      #FBFAF4;

  --green-900:  #16301F;
  --green-700:  #2C4E36;
  --green-600:  #3E6B4A;
  --green-500:  #5B8C6A;
  --green-400:  #7BAE89;
  --green-300:  #9BC4A6;
  --green-100:  #DDEBDD;
  --gold:       #B79A5B;

  --line:       rgba(22, 48, 31, .14);
  --line-soft:  rgba(22, 48, 31, .08);
  --card:       rgba(251, 250, 244, .68);
  --card-solid: rgba(251, 250, 244, .9);
  --shadow:     0 22px 55px -30px rgba(22, 48, 31, .40);
  --shadow-sm:  0 10px 28px -18px rgba(22, 48, 31, .35);

  --serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", "Times New Roman", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --maxw: 1120px;
  --nav-h: 66px;
  --radius: 18px;
  --ease: cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{ box-sizing: border-box; }

html{
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body{
  margin: 0;
  min-height: 100%;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
  background: var(--cream);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img{ max-width: 100%; display: block; }
a{ color: inherit; text-decoration: none; }
h1,h2,h3{ font-family: var(--serif); font-weight: 600; line-height: 1.3; margin: 0; letter-spacing: .01em; }
p{ margin: 0; }
ul{ margin: 0; padding: 0; list-style: none; }

::selection{ background: var(--green-300); color: var(--green-900); }

:focus-visible{
  outline: 2px solid var(--green-600);
  outline-offset: 3px;
  border-radius: 6px;
}

.wrap{
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
}

.muted{ color: var(--ink-faint); }

/* ---------- 背景层（关键：不用 background-attachment:fixed） ---------- */

.bg-layer{
  position: fixed;
  inset: 0;
  z-index: -3;
  background-color: #C6DCB6;
  background-image: url("../assets/bg-placeholder.jpg");
  background-position: center 34%;
  background-size: cover;
  background-repeat: no-repeat;
}

.bg-layer img{
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 34%;
  opacity: 0;
  transition: opacity 1s var(--ease);
}

.bg-layer img.is-ready{ opacity: 1; }

/* 渐隐入纸：顶部薄 → 下部浓 */
.bg-veil{
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background: linear-gradient(180deg,
    rgba(244, 247, 241, .28) 0%,
    rgba(242, 246, 239, .50) 20%,
    rgba(243, 245, 237, .72) 44%,
    rgba(246, 244, 235, .88) 66%,
    rgba(246, 243, 233, .96) 100%);
}

#petals{
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* ---------- 滚动进度 ---------- */

.progress{
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  z-index: 60;
  background: linear-gradient(90deg, var(--green-400), var(--green-600), var(--gold));
  transition: width .1s linear;
}

/* ---------- 导航 ---------- */

.nav{
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 50;
  transition: background .35s var(--ease), box-shadow .35s var(--ease), backdrop-filter .35s;
}

.nav.is-stuck{
  background: rgba(246, 244, 235, .82);
  backdrop-filter: blur(14px) saturate(1.3);
  -webkit-backdrop-filter: blur(14px) saturate(1.3);
  box-shadow: 0 1px 0 var(--line-soft), 0 10px 30px -24px rgba(22,48,31,.5);
}

.nav-inner{
  max-width: var(--maxw);
  height: 100%;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--serif);
  font-size: 1.06rem;
  letter-spacing: .04em;
  color: var(--green-900);
}

.brand-mark{
  width: 12px; height: 12px;
  border-radius: 50% 50% 50% 2px;
  background: var(--green-500);
  box-shadow: 0 0 0 3px rgba(91,140,106,.18);
  transition: transform .5s var(--ease);
}
.brand:hover .brand-mark{ transform: rotate(90deg); }

.nav-links{
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a{
  position: relative;
  padding: 8px 16px;
  font-size: .94rem;
  color: var(--ink-soft);
  border-radius: 999px;
  transition: color .25s, background .25s;
}
.nav-links a:hover{ color: var(--green-900); background: rgba(155,196,166,.22); }

.nav-links a.is-active{
  color: var(--green-900);
  font-weight: 600;
}
.nav-links a.is-active::after{
  content: "";
  position: absolute;
  left: 50%; bottom: 1px;
  width: 18px; height: 2px;
  transform: translateX(-50%);
  border-radius: 2px;
  background: var(--green-600);
}

.burger{
  display: none;
  width: 42px; height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(251,250,244,.6);
  cursor: pointer;
  position: relative;
}
.burger span{
  position: absolute;
  left: 50%; width: 17px; height: 1.6px;
  background: var(--green-900);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: transform .32s var(--ease), opacity .2s;
}
.burger span:nth-child(1){ top: 14px; }
.burger span:nth-child(2){ top: 20px; }
.burger span:nth-child(3){ top: 26px; }

.burger[aria-expanded="true"] span:nth-child(1){ transform: translateX(-50%) translateY(6px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2){ opacity: 0; }
.burger[aria-expanded="true"] span:nth-child(3){ transform: translateX(-50%) translateY(-6px) rotate(-45deg); }

/* ---------- 首屏 ---------- */

.hero{
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 48px) 0 120px;
}

.hero-inner{ max-width: 800px; }

.eyebrow{
  display: inline-block;
  margin-bottom: 22px;
  padding: 6px 15px;
  font-size: .8rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--green-700);
  background: rgba(251,250,244,.62);
  border: 1px solid rgba(251,250,244,.9);
  border-radius: 999px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.hero-title{
  font-size: clamp(2.5rem, 7.4vw, 4.6rem);
  letter-spacing: .01em;
  color: var(--green-900);
  margin-bottom: 26px;
}
.hero-title .line{ display: block; }
.hero-title .line:first-child{
  font-size: .46em;
  color: var(--ink-soft);
  font-weight: 400;
  letter-spacing: .18em;
  margin-bottom: .28em;
}
.hero-title .accent{
  background: linear-gradient(105deg, var(--green-900) 12%, var(--green-600) 58%, var(--gold) 108%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub{
  max-width: 34em;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  color: var(--ink-soft);
  margin-bottom: 30px;
}

.hero-tags{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}
.tag{
  padding: 5px 14px;
  font-size: .86rem;
  color: var(--green-700);
  background: rgba(221,235,221,.72);
  border: 1px solid rgba(155,196,166,.7);
  border-radius: 999px;
}

.hero-cta{ display: flex; flex-wrap: wrap; gap: 14px; }

.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  font-size: .96rem;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .28s var(--ease), box-shadow .28s var(--ease), background .28s, color .28s;
}
.btn-solid{
  background: var(--green-700);
  color: var(--white);
  box-shadow: 0 14px 30px -16px rgba(22,48,31,.7);
}
.btn-solid:hover{ transform: translateY(-2px); background: var(--green-900); box-shadow: 0 20px 38px -16px rgba(22,48,31,.8); }
.btn-ghost{
  color: var(--green-900);
  background: rgba(251,250,244,.6);
  border-color: rgba(44,78,54,.22);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.btn-ghost:hover{ transform: translateY(-2px); background: rgba(251,250,244,.92); }

.scroll-hint{
  position: absolute;
  left: 50%; bottom: 34px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--ink-faint);
  font-size: .74rem;
  letter-spacing: .16em;
}
.mouse{
  width: 22px; height: 34px;
  border: 1.5px solid rgba(44,78,54,.4);
  border-radius: 12px;
  display: grid;
  justify-items: center;
  padding-top: 6px;
}
.mouse i{
  width: 3px; height: 6px;
  border-radius: 2px;
  background: var(--green-600);
  animation: wheel 1.8s var(--ease) infinite;
}
@keyframes wheel{
  0%   { transform: translateY(0);    opacity: 0; }
  30%  { opacity: 1; }
  100% { transform: translateY(11px); opacity: 0; }
}

/* ---------- 通用板块 ---------- */

.section{ padding: 96px 0; }
.section-last{ padding-bottom: 60px; }

.sec-head{ margin-bottom: 46px; max-width: 620px; }

.sec-num{
  font-family: var(--serif);
  font-size: .84rem;
  letter-spacing: .3em;
  color: var(--green-500);
  margin-bottom: 10px;
}

.sec-title{
  display: inline-block;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--green-900);
  padding-bottom: 12px;
  position: relative;
}
.sec-title::after{
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 46px; height: 3px;
  border-radius: 3px;
  background: var(--gold);
  opacity: .75;
}

.sec-desc{
  margin-top: 16px;
  color: var(--ink-faint);
  font-size: .98rem;
}

/* ---------- 卡片 ---------- */

.card{
  background: var(--card);
  border: 1px solid rgba(255,255,255,.72);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
}

/* ---------- 关于 ---------- */

.about-grid{
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: 26px;
  align-items: start;
}

.card-lead{ padding: 38px 40px; }
.card-lead p + p{ margin-top: 18px; }
.card-lead p{ color: var(--ink-soft); }

.card-side{ padding: 30px 32px; }

.card-title{
  font-size: 1.12rem;
  color: var(--green-900);
  margin-bottom: 20px;
}

.facts li{
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 9px 0;
  font-size: .94rem;
  color: var(--ink-soft);
  border-bottom: 1px dashed var(--line-soft);
}
.facts li:last-child{ border-bottom: 0; }
.facts b{
  flex: none;
  color: var(--green-700);
  font-weight: 600;
}

.dot{
  flex: none;
  width: 6px; height: 6px;
  margin-top: 11px;
  border-radius: 50%;
  background: var(--green-400);
}

.side-stats{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
}
.side-stats div{ text-align: center; }
.side-stats strong{
  display: block;
  font-family: var(--serif);
  font-size: 1.75rem;
  color: var(--green-700);
  line-height: 1.2;
}
.side-stats span{ font-size: .8rem; color: var(--ink-faint); }

/* ---------- 作品 ---------- */

.works-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.work{ overflow: hidden; display: flex; flex-direction: column; transition: transform .4s var(--ease), box-shadow .4s var(--ease); }
.work:hover{ transform: translateY(-4px); box-shadow: 0 30px 60px -30px rgba(22,48,31,.5); }

.work-cover{
  height: 168px;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 16px 20px;
  position: relative;
  overflow: hidden;
}
.work-cover::after{
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 20% 10%, rgba(255,255,255,.42), transparent 62%);
}
.work-cover span{
  position: relative;
  z-index: 1;
  font-family: var(--serif);
  font-size: 2.6rem;
  color: rgba(255,255,255,.72);
  letter-spacing: .02em;
}
.cover-a{ background: linear-gradient(135deg, #6FA97E 0%, #3E6B4A 55%, #24402E 100%); }
.cover-b{ background: linear-gradient(135deg, #A8CFA3 0%, #7BAE89 50%, #4C7A58 100%); }
.cover-c{ background: linear-gradient(135deg, #C6DCB6 0%, #9BC4A6 48%, #5B8C6A 100%); }
.cover-d{ background: linear-gradient(135deg, #D8CFA8 0%, #B79A5B 52%, #7C6733 100%); }

.work-body{ padding: 26px 28px 30px; }

.work-meta{
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--green-500);
  margin-bottom: 8px;
}

.work-title{
  font-size: 1.34rem;
  color: var(--green-900);
  margin-bottom: 10px;
}

.work-desc{
  font-size: .93rem;
  color: var(--ink-soft);
}

.work-tags{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.work-tags li{
  padding: 3px 11px;
  font-size: .76rem;
  color: var(--green-700);
  background: rgba(221,235,221,.6);
  border-radius: 999px;
}

/* ---------- 写字 ---------- */

.posts{ padding: 8px 12px; }

.posts li + li{ border-top: 1px solid var(--line-soft); }

.posts a{
  display: block;
  padding: 26px 26px 28px;
  border-radius: 14px;
  transition: background .3s var(--ease), padding-left .3s var(--ease);
}
.posts a:hover{ background: rgba(221,235,221,.34); }

.posts time{
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--green-500);
}

.posts h3{
  font-size: 1.2rem;
  color: var(--green-900);
  margin: 8px 0 6px;
}

.posts p{
  font-size: .92rem;
  color: var(--ink-faint);
}

/* ---------- 联系 ---------- */

.contact-card{
  padding: 54px 48px;
  text-align: center;
  background: rgba(251,250,244,.78);
}

.contact-title{
  font-size: clamp(1.7rem, 3.6vw, 2.3rem);
  color: var(--green-900);
  margin-bottom: 16px;
}

.contact-desc{
  max-width: 30em;
  margin: 0 auto 30px;
  color: var(--ink-soft);
}

.mail{
  display: inline-block;
  font-family: var(--serif);
  font-size: clamp(1.15rem, 3vw, 1.7rem);
  color: var(--green-700);
  padding-bottom: 4px;
  border-bottom: 2px solid rgba(183,154,91,.55);
  transition: color .3s, border-color .3s;
}
.mail:hover{ color: var(--green-900); border-color: var(--green-700); }

.socials{
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 36px;
}
.socials a{
  padding: 9px 22px;
  font-size: .9rem;
  color: var(--green-700);
  border: 1px solid rgba(44,78,54,.2);
  border-radius: 999px;
  background: rgba(255,255,255,.5);
  transition: transform .28s var(--ease), background .28s, color .28s;
}
.socials a:hover{ transform: translateY(-2px); background: var(--green-700); color: var(--white); }

/* ---------- 页脚 ---------- */

.footer{
  padding: 40px 0 52px;
  border-top: 1px solid var(--line-soft);
}
.footer-inner{
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  font-size: .84rem;
  color: var(--ink-faint);
}
.footer a{ border-bottom: 1px solid transparent; transition: border-color .25s; }
.footer a:hover{ border-color: currentColor; }
.credit i{ font-style: italic; }

/* ---------- 回到顶部 ---------- */

.totop{
  position: fixed;
  right: 26px; bottom: 26px;
  z-index: 45;
  width: 46px; height: 46px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--green-700);
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 14px 30px -14px rgba(22,48,31,.75);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .35s var(--ease), transform .35s var(--ease), visibility .35s, background .3s;
}
.totop.is-on{ opacity: 1; visibility: visible; transform: translateY(0); }
.totop:hover{ background: var(--green-900); transform: translateY(-3px); }

/* ---------- 滚动揭示 ---------- */

[data-reveal]{
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
[data-reveal].is-in{ opacity: 1; transform: none; }

/* 同组元素依次入场 */
.works-grid [data-reveal]:nth-child(2),
.posts,
.about-grid [data-reveal]:nth-child(2){ transition-delay: .1s; }
.works-grid [data-reveal]:nth-child(3){ transition-delay: .06s; }
.works-grid [data-reveal]:nth-child(4){ transition-delay: .16s; }

/* ---------- 响应式 ---------- */

@media (max-width: 900px){
  .about-grid{ grid-template-columns: 1fr; }
  .works-grid{ grid-template-columns: 1fr; }
  .section{ padding: 78px 0; }
}

@media (max-width: 720px){
  :root{ --nav-h: 60px; }

  .wrap{ padding: 0 20px; }
  .nav-inner{ padding: 0 20px; }

  .burger{ display: block; }

  .nav-links{
    position: fixed;
    top: var(--nav-h);
    left: 12px; right: 12px;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px;
    border-radius: 16px;
    background: rgba(248,246,238,.94);
    border: 1px solid rgba(255,255,255,.8);
    box-shadow: var(--shadow);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
  }
  .nav-links.is-open{ opacity: 1; visibility: visible; transform: translateY(0); }
  .nav-links a{ padding: 13px 16px; border-radius: 12px; }
  .nav-links a.is-active::after{ display: none; }
  .nav-links a.is-active{ background: rgba(155,196,166,.28); }

  .hero{ min-height: auto; padding: calc(var(--nav-h) + 64px) 0 110px; }
  .hero-title{ font-size: clamp(2.1rem, 10vw, 3.1rem); }
  .hero-cta{ gap: 10px; }
  .btn{ flex: 1 1 auto; padding: 12px 22px; }

  .card-lead{ padding: 30px 24px; }
  .card-side{ padding: 26px 24px; }
  .work-body{ padding: 22px 22px 26px; }
  .work-cover{ height: 140px; }
  .posts a{ padding: 22px 16px 24px; }
  .contact-card{ padding: 40px 24px; }
  .section{ padding: 64px 0; }
  .scroll-hint{ display: none; }

  .totop{ right: 16px; bottom: 16px; width: 42px; height: 42px; }
}

@media (max-width: 400px){
  .hero-title .line:first-child{ letter-spacing: .1em; }
  .side-stats strong{ font-size: 1.5rem; }
}

/* ---------- 无障碍：尊重减少动态偏好 ---------- */

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *,*::before,*::after{
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal]{ opacity: 1 !important; transform: none !important; }
  #petals{ display: none; }
  .scroll-hint{ display: none; }
}