/* 瑞典海报的路子，放开了做：整屏平涂的颜色、特粗的宋体大字、一堆真 3D 的盒子、一条斜着滚动的黑带。
   没有图片、渐变和模糊阴影；颜色只有黄、蓝、红、绿、黑和纸白。 */

@font-face {
    font-family: "Display";
    src: url("assets/display.woff") format("woff");
    font-weight: 900;
    font-display: swap;
}

:root {
    --paper: #f5efe2;
    --ink: #191917;
    --yellow: #f2b632;
    --yellow-shade: #dc9f1e;
    --blue: #2b5c8f;
    --red: #cf4f33;
    --green: #2f6a4f;
    --page: 1440px;
    --gutter: clamp(20px, 4.5vw, 64px);
    --display: "Display", "Songti SC", "Noto Serif SC", "SimSun", serif;
    --out: cubic-bezier(0.2, 0.8, 0.2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: hidden; }
body {
    background: var(--ink); color: var(--ink);
    font-family: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
    font-size: 17px; line-height: 1.75; -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 3px solid currentColor; outline-offset: 4px; }
.wrap { width: 100%; max-width: var(--page); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }

/* ---------- 封面：整屏黄色，标题横贯整行 ---------- */
.cover { background: var(--yellow); min-height: 100svh; display: flex; flex-direction: column; overflow: hidden; }
.bar { display: flex; align-items: center; justify-content: space-between; height: 84px; flex-shrink: 0; }
.mark { font-family: var(--display); font-size: 24px; font-weight: 900; letter-spacing: -0.01em; }
.bar nav { display: flex; gap: clamp(20px, 3vw, 40px); font-size: 15px; font-weight: 700; }
.bar nav a { padding: 4px 0; background: linear-gradient(var(--ink), var(--ink)) 0 100% / 0 2px no-repeat; transition: background-size 0.25s var(--out); }
.bar nav a:hover { background-size: 100% 2px; }

/* 底部留出斜带压上来的位置，免得盖住标题 */
.hero { flex: 1; display: flex; flex-direction: column; container-type: inline-size; padding-bottom: clamp(30px, 5.4vw, 84px); }
.hero-mid { flex: 1; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 24px; }
.hero-note { padding-bottom: clamp(16px, 3svh, 36px); }
.intro { font-size: clamp(17px, 1.7vw, 22px); font-weight: 600; animation: rise 0.7s var(--out) 0.2s both; }

/* 六个字正好排满一行：字号跟着容器宽度走，不会折行 */
h1 { font-family: var(--display); font-weight: 900; line-height: 1; letter-spacing: -0.02em; white-space: nowrap; font-size: 15vw; font-size: min(calc(100cqw / 5.94), 46svh); }
h1 span { display: inline-block; animation: rise 0.9s var(--out) both; }
h1 span:nth-child(1) { animation-delay: 0.25s; }
h1 span:nth-child(2) { animation-delay: 0.37s; }
@keyframes rise { from { opacity: 0; transform: translateY(0.35em); } }

/* ---------- 盒子堆（真 3D） ---------- */
.scene {
    --s: clamp(54px, min(7.2vw, 9.2svh), 132px);
    position: relative; width: calc(var(--s) * 5.4); height: calc(var(--s) * 5.2); margin-right: clamp(0px, 5vw, 96px); flex-shrink: 0;
    perspective: calc(var(--s) * 18);
}
.world, .box, .box-drop, .box-in, .lid { position: absolute; left: 0; top: 0; width: 0; height: 0; transform-style: preserve-3d; }
.world { left: 47%; top: 85%; transform: rotateX(calc(-27deg + var(--rx, 0deg))) rotateY(calc(42deg + var(--ry, 0deg))); }
.box.col { transform: translate3d(calc(var(--a) * var(--s)), 0, calc(var(--b) * var(--s))); }
.box.up { transform: translateY(calc(var(--s) * -1)); }
.box.float { transform: translateY(calc(var(--s) * -1.5)); }

/* 一只只从上面掉下来，落地弹一下 */
.box-drop { animation: drop 0.8s both; animation-delay: calc(0.3s + var(--n) * 0.09s); }
@keyframes drop {
    0% { transform: translateY(-130svh); animation-timing-function: cubic-bezier(0.5, 0, 0.9, 0.6); }
    62% { transform: translateY(0); animation-timing-function: cubic-bezier(0.2, 0.7, 0.4, 1); }
    78% { transform: translateY(calc(var(--s) * -0.12)); animation-timing-function: cubic-bezier(0.6, 0, 0.8, 0.4); }
    100% { transform: translateY(0); }
}
.box.hop > .box-drop > .box-in { animation: hop 0.5s; }
@keyframes hop {
    0%, 100% { transform: translateY(0); animation-timing-function: cubic-bezier(0.2, 0.7, 0.4, 1); }
    45% { transform: translateY(calc(var(--s) * -0.34)); animation-timing-function: cubic-bezier(0.6, 0, 0.8, 0.4); }
}

.f { position: absolute; left: 0; top: 0; width: calc(var(--s) + 0.6px); height: calc(var(--s) + 0.6px); transform-origin: 0 0; backface-visibility: hidden; overflow: hidden; }
.top { background: var(--t); transform: translateY(calc(var(--s) * -1)) rotateX(90deg); }
.left { background: var(--l); transform: translateY(calc(var(--s) * -1)) rotateY(-90deg); }
.right { background: var(--r); transform: translate3d(0, calc(var(--s) * -1), var(--s)); }
/* 落在面上的影子：同一个面上的几块用同一个实色，叠在一起也不会更深 */
.cast { position: absolute; inset: 0; animation: fade 0.4s 1.5s both; }
.top > .cast { background: var(--ts); }
.left > .cast { background: var(--ls); }
@keyframes fade { from { opacity: 0; } }

.blue { --t: #6f9dd2; --ts: #4c7cb1; --l: #2b5c8f; --ls: #204872; --r: #1a3d63; }
.red { --t: #f08c70; --ts: #cf6c52; --l: #cf4f33; --ls: #a93d26; --r: #8c311f; }
.green { --t: #72b093; --ts: #518c70; --l: #2f6a4f; --ls: #24533e; --r: #1d4634; }
.ink { --t: #5b5b54; --ts: #42423d; --l: #33332f; --ls: #272724; --r: #191917; }
.paper { --t: #fffaf0; --ts: #ddd3bb; --l: #efe6d2; --ls: #d3c9b1; --r: #c9bea4; }

/* 地上的影子 */
.gs { position: absolute; left: 0; top: 0; width: calc(var(--w) * var(--s)); height: calc(var(--w) * var(--s)); transform-origin: 0 0; background: var(--yellow-shade);
    transform: translate3d(calc(var(--a) * var(--s)), 0, calc(var(--b) * var(--s))) rotateX(90deg); animation: fade 0.3s both; animation-delay: calc(0.8s + var(--n) * 0.09s); }

/* 最上面浮着的那只：慢慢起伏，盖子会掀开，能看到里面 */
.float > .box-drop > .box-in { animation: float 5s ease-in-out 1.8s infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(calc(var(--s) * -0.14)); } }
.in-floor { background: #8f8468; transform: rotateX(90deg); }
.in-x { background: #a69a7c; transform: translate3d(var(--s), calc(var(--s) * -1), 0) rotateY(-90deg); }
.in-z { background: #b9ad8f; transform: translateY(calc(var(--s) * -1)); }
.lid { width: var(--s); height: var(--s); transform-origin: 0 0; transform: translateY(calc(var(--s) * -1)) rotateX(90deg); animation: lid 5s 1.8s infinite; }
.lid-out, .lid-in { position: absolute; left: 0; top: 0; width: calc(100% + 0.6px); height: calc(100% + 0.6px); backface-visibility: hidden; }
.lid-out { background: var(--t); }
.lid-in { background: #d9cfb6; transform: rotateX(180deg); }
@keyframes lid {
    0%, 18%, 86%, 100% { transform: translateY(calc(var(--s) * -1)) rotateX(90deg); animation-timing-function: cubic-bezier(0.3, 0, 0.2, 1); }
    38% { transform: translateY(calc(var(--s) * -1)) rotateX(204deg); animation-timing-function: cubic-bezier(0.3, 0, 0.3, 1); }
    46% { transform: translateY(calc(var(--s) * -1)) rotateX(192deg); }
    66% { transform: translateY(calc(var(--s) * -1)) rotateX(196deg); animation-timing-function: cubic-bezier(0.5, 0, 0.6, 1); }
}
.cast.under { transform: translate(15%, 15%); animation: fade 0.4s 1.5s both, under 5s ease-in-out 1.8s infinite; }
@keyframes under { 0%, 100% { transform: translate(15%, 15%); } 50% { transform: translate(19%, 19%); } }

/* ---------- 斜着的滚动黑带 ---------- */
.ticker { position: relative; z-index: 2; margin: -2.4vw -4vw; padding: 0; background: var(--ink); color: var(--yellow); overflow: hidden; white-space: nowrap; transform: rotate(-2deg); }
.ticker-track { display: inline-flex; align-items: center; animation: slide 40s linear infinite; }
.ticker span { display: inline-flex; align-items: center; padding: clamp(14px, 1.6vw, 26px) 0; font-family: var(--display); font-weight: 900; font-size: clamp(22px, 3.2vw, 48px); line-height: 1.2; }
.ticker span::after { content: ""; width: 0.32em; height: 0.32em; margin: 0 clamp(20px, 2.8vw, 48px); background: var(--paper); }
@keyframes slide { to { transform: translateX(-50%); } }

/* ---------- 三段整屏色带：圆、方、三角 ---------- */
.band { color: #fff; overflow: hidden; }
.band.blue { background: var(--blue); }
.band.red { background: var(--red); }
.band.green { background: var(--green); }
.band-in { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); align-items: center; gap: clamp(24px, 4vw, 64px); min-height: min(88svh, 820px); padding-top: clamp(72px, 10vw, 150px); padding-bottom: clamp(64px, 9vw, 130px); container-type: inline-size; }
.band h2 { font-family: var(--display); font-weight: 900; line-height: 1.02; letter-spacing: -0.01em; white-space: nowrap; font-size: 9vw; font-size: 10.9cqw; }
.band p { max-width: 23em; margin-top: clamp(20px, 2.6vw, 40px); font-size: clamp(18px, 1.75vw, 24px); line-height: 1.7; }
.band h2, .band p, .band .button { opacity: 0; transform: translateY(48px); transition: opacity 0.8s var(--out), transform 0.8s var(--out); }
.band p { transition-delay: 0.1s; }
.band .button { transition-delay: 0.2s; }
.band.in h2, .band.in p, .band.in .button { opacity: 1; transform: none; }

.button { display: inline-flex; align-items: center; gap: 12px; height: 60px; margin-top: 36px; padding: 0 30px; background: var(--paper); color: var(--ink); font-size: 17px; font-weight: 700; }
.button span { transition: transform 0.25s var(--out); }
.button:hover span { transform: translateX(8px); }

.shape { justify-self: center; width: min(100%, 460px); aspect-ratio: 1; transition: transform 1.1s var(--out), opacity 0.5s ease; opacity: 0; }
.circle { background: var(--yellow); border-radius: 50%; transform: translateX(70%) rotate(120deg); }
.square { background: var(--paper); transform: rotate(80deg) scale(0.5); }
.triangle { background: var(--yellow); clip-path: polygon(50% 7%, 100% 93%, 0 93%); transform: translateY(60%); }
.band.in .shape { opacity: 1; }
.band.in .circle { transform: none; }
.band.in .square { transform: rotate(12deg) scale(0.82); }
.band.in .triangle { transform: none; }
.band.in:hover .circle { transform: translateX(-8%); }
.band.in:hover .square { transform: rotate(-6deg) scale(0.82); }
.band.in:hover .triangle { transform: translateY(-6%); }

/* ---------- 说明：黑底收尾，最下面一行通栏的名字 ---------- */
.notes { background: var(--ink); color: var(--paper); }
.notes-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 20px clamp(24px, 4vw, 64px); padding-top: clamp(72px, 10vw, 150px); padding-bottom: clamp(48px, 6vw, 96px); }
.notes h2 { font-family: var(--display); font-weight: 900; font-size: clamp(44px, 7vw, 108px); line-height: 1; color: var(--yellow); }
.notes-body { max-width: 38em; font-size: 16px; line-height: 1.9; opacity: 0.86; }
.notes-body p + p { margin-top: 1em; }
.giant-wrap { container-type: inline-size; }
.giant { font-family: var(--display); font-weight: 900; font-size: 15.6vw; font-size: 16.5cqw; line-height: 1.05; letter-spacing: -0.02em; white-space: nowrap; color: var(--yellow); }
.bottom { display: flex; justify-content: space-between; gap: 16px; padding-top: 22px; padding-bottom: 32px; font-size: 14px; opacity: 0.6; }

@media (max-width: 760px) {
    body { font-size: 16px; }
    .bar { height: 64px; }
    .hero-mid { grid-template-columns: minmax(0, 1fr); align-items: start; align-content: space-between; gap: 24px; }
    /* 盒子堆比它的框高出一截，上面留出位置，别压到顶栏 */
    .scene { --s: clamp(44px, 13vw, 68px); order: -1; margin: calc(var(--s) * 1.2) auto 0; }
    .hero-note { padding-bottom: 14px; }
    /* 手机上标题分两行：盒子世界 / 复刻 */
    h1 { font-size: 23vw; font-size: calc(100cqw / 3.96); line-height: 1.02; }
    h1 span { display: block; }
    .ticker { margin: -4vw -6vw; }
    .band-in { grid-template-columns: minmax(0, 1fr); min-height: 0; }
    .band h2 { font-size: 15vw; font-size: 17.5cqw; }
    .shape { order: -1; justify-self: start; width: 44%; }
    .notes-grid { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::after { animation: none !important; transition: none !important; }
    .band h2, .band p, .band .button, .shape { opacity: 1; transform: none; }
    .band .square { transform: rotate(12deg) scale(0.82); }
}