/* 密列瓦能源官网 v0.2：纸白底、晨雾封面、毛玻璃界面。只用系统字体，不引外部资源 */
:root {
  --paper: #F5F6F3;
  --ink: #1A2220;
  --ink-2: rgba(26, 34, 32, .64);
  --ink-3: rgba(26, 34, 32, .4);
  --line: rgba(26, 34, 32, .1);
  --deep: #17201D;
  --moss: #3F5F48;
  --amber: #B9803A;
  /* 毛玻璃 */
  --glass: rgba(255, 255, 255, .46);
  --glass-edge: rgba(255, 255, 255, .62);
  --glass-shadow: 0 12px 40px rgba(20, 32, 28, .10), inset 0 1px 0 rgba(255, 255, 255, .7);
  --glass-dark: rgba(255, 255, 255, .07);
  --glass-dark-edge: rgba(255, 255, 255, .16);
  --blur: blur(22px) saturate(170%);
  --r-lg: 28px;
  --r-md: 18px;
  --gutter: 20px;
  --w: 1200px;
  --mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }
body {
  background: var(--paper); color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, "Helvetica Neue", sans-serif;
  font-size: 16px; line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: var(--w); margin: 0 auto; padding: 0 40px; }
.glass {
  background: var(--glass); border: 1px solid var(--glass-edge); box-shadow: var(--glass-shadow);
  backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
}
.mono { font-family: var(--mono); font-size: 11px; letter-spacing: 2px; text-transform: uppercase; }

/* 导航 */
.nav {
  position: fixed; top: 32px; left: 50%; transform: translateX(-50%); z-index: 20;
  width: min(900px, calc(100% - 2 * var(--gutter) - 32px));
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 10px 9px 22px; border-radius: 999px;
}
.brand { display: flex; align-items: center; gap: 10px; font-size: 15px; font-weight: 500; letter-spacing: 3px; }
.brand img { width: 20px; height: 25px; }
.nav ul { display: flex; gap: 34px; list-style: none; font-size: 14px; }
.nav ul a { opacity: .8; transition: opacity .2s; } .nav ul a:hover { opacity: 1; }
.btn {
  display: inline-flex; align-items: center; gap: 10px; border-radius: 999px;
  padding: 13px 24px; font-size: 15px; background: var(--ink); color: #fff; transition: transform .2s;
}
.btn:hover { transform: translateY(-1px); }
.nav .btn { padding: 8px 18px; font-size: 13px; }
.btn.glass { color: var(--ink); background: rgba(255, 255, 255, .55); }

/* 首屏 */
.hero {
  position: relative; margin: var(--gutter); height: min(calc(100vh - 2 * var(--gutter)), 880px); min-height: 620px;
  border-radius: var(--r-lg); overflow: hidden; isolation: isolate; background: #E9EEEC;
}
.hero::before { content: ""; position: absolute; inset: 0; z-index: -2; background-position: center 58%; background-size: cover; background-repeat: no-repeat; }
.hero::after { content: ""; position: absolute; inset: 0; z-index: -1; }
.hero .in { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 0 24px 170px; }
.hero h1 { font-size: 66px; font-weight: 400; line-height: 1.22; letter-spacing: 3px; }
.hero h1 em { display: block; font-style: normal; font-size: 40px; letter-spacing: 2px; color: var(--ink-2); margin-top: 8px; }
.hero p { margin: 22px 0 30px; color: var(--ink-2); }
.hero .mk { position: absolute; width: 18px; height: 18px; border: 0 solid rgba(26, 34, 32, .35); }
.hero .tl { top: 116px; left: 40px; border-top-width: 1px; border-left-width: 1px; }
.hero .tr { top: 116px; right: 40px; border-top-width: 1px; border-right-width: 1px; }
.stats {
  position: absolute; left: 50%; bottom: 28px; transform: translateX(-50%);
  width: min(900px, calc(100% - 56px)); display: grid; grid-template-columns: repeat(3, 1fr);
  border-radius: var(--r-md); overflow: hidden;
}
.stats > div { padding: 20px 26px; }
.stats > div + div { border-left: 1px solid rgba(255, 255, 255, .55); }
.stats .mono { color: var(--ink-3); display: block; margin-bottom: 10px; }
.stats b { font-family: "Helvetica Neue", "PingFang SC", sans-serif; font-weight: 300; font-size: 38px; line-height: 1; letter-spacing: -.5px; }
.stats b small { font-size: 16px; margin-left: 3px; }
.stats span:last-child { display: block; margin-top: 8px; font-size: 13px; color: var(--ink-2); }
/* 段落 */
section { padding: 140px 0; }
.kicker { display: flex; align-items: center; gap: 14px; color: var(--ink-3); }
.kicker::after { content: ""; width: 64px; height: 1px; background: currentColor; opacity: .6; }
.kicker b { font-weight: 400; color: var(--moss); }
.h2 { font-size: 40px; line-height: 1.35; font-weight: 400; letter-spacing: .5px; margin-top: 26px; }
.h2 em { font-style: normal; color: var(--ink-3); }
.lead { font-size: 16px; color: var(--ink-2); max-width: 380px; }
.split { display: grid; grid-template-columns: 1.4fr 1fr; gap: 80px; align-items: end; }

/* 主营业务：深色底、背景图虚化，四块深色玻璃 */
.biz {
  position: relative; margin: 0 var(--gutter); border-radius: var(--r-lg); overflow: hidden; isolation: isolate;
  color: #EEF1ED; padding: 120px 0;
}
.biz::before { content: ""; position: absolute; inset: -40px; z-index: -2; background: url("img/hero_aerial.jpg") center / cover; filter: blur(28px) saturate(.6) brightness(.55); }
.biz::after { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(160deg, rgba(23, 32, 29, .72), rgba(23, 32, 29, .9)); }
.biz .kicker { color: rgba(238, 241, 237, .5); } .biz .kicker b { color: #9DBBA5; }
.biz .h2 em { color: rgba(238, 241, 237, .42); }
.tiles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 64px; }
.tile {
  padding: 34px 34px 38px; border-radius: var(--r-md);
  background: var(--glass-dark); border: 1px solid var(--glass-dark-edge);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .08); backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
}
.tile .mono { color: var(--amber); }
.tile h3 { font-size: 20px; font-weight: 500; margin: 16px 0 10px; }
.tile p { font-size: 15px; color: rgba(238, 241, 237, .64); }

/* 三件事：图片卡，底部毛玻璃说明 */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 64px; }
.card { position: relative; aspect-ratio: 4 / 5; border-radius: var(--r-md); overflow: hidden; background: center / cover no-repeat; }
.card .cap { position: absolute; left: 12px; right: 12px; bottom: 12px; padding: 20px 22px 22px; border-radius: 14px; }
.card .cap .mono { color: var(--moss); }
.card h3 { font-size: 19px; font-weight: 500; margin: 8px 0 6px; }
.card p { font-size: 14px; color: var(--ink-2); line-height: 1.65; }

/* 经验 */
.rows { margin-top: 64px; border-top: 1px solid var(--line); }
.rows > div { display: grid; grid-template-columns: 200px 1fr 1fr; gap: 40px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.rows .mono { color: var(--ink-3); padding-top: 4px; }
.rows h3 { font-size: 18px; font-weight: 500; }
.rows p { font-size: 15px; color: var(--ink-2); }

/* 联系：图片上放一块毛玻璃 */
.contact {
  position: relative; margin: 0 var(--gutter); border-radius: var(--r-lg); overflow: hidden; min-height: 560px;
  display: flex; align-items: center; justify-content: center; background: url("img/a_sprout.jpg") center 40% / cover no-repeat;
}
.contact .panel { position: relative; text-align: center; padding: 56px 64px; border-radius: 24px; max-width: 620px; }
.contact .h2 { margin-top: 18px; font-size: 38px; }
.contact p { margin: 14px 0 30px; color: var(--ink-2); }
.contact address { font-style: normal; font-size: 13px; color: var(--ink-3); margin-top: 22px; }

footer { padding: 64px 0 44px; font-size: 13px; color: var(--ink-2); }
footer .wrap { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }

/* 404 */
.lost { min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px; text-align: center; }
.lost img { width: 90px; }

@media (max-width: 760px) {
  :root { --gutter: 10px; }
  .wrap { padding: 0 22px; }
  .nav { top: 18px; } .nav ul { display: none; }
  .hero { height: auto; min-height: 720px; }
  .hero .in { padding: 0 22px 250px; } .hero h1 { font-size: 42px; } .hero h1 em { font-size: 24px; }
  .hero .mk { display: none; }
  .stats { grid-template-columns: 1fr; bottom: 14px; width: calc(100% - 28px); }
  .stats > div { padding: 14px 18px; display: flex; align-items: baseline; gap: 12px; }
  .stats > div + div { border-left: 0; border-top: 1px solid rgba(255, 255, 255, .55); }
  .stats .mono { display: none; } .stats b { font-size: 26px; } .stats span:last-child { margin: 0; }
  section, .biz { padding: 88px 0; }
  .h2 { font-size: 28px; }
  .split, .tiles, .cards, .rows > div { grid-template-columns: 1fr; gap: 18px; }
  .contact .panel { margin: 0 14px; padding: 40px 24px; } .contact .h2 { font-size: 26px; }
}