/* ==========================================================================
   sadness.love
   ========================================================================== */

/* ---- faces ---------------------------------------------------------------- */
@import url("fonts/fonts.css");

/* ---- tokens -------------------------------------------------------------- */
:root {
  --maxw: 1240px;
  --gutter: clamp(20px, 5vw, 64px);

  --serif: "Instrument Serif", "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --cjk: "Noto Serif SC", "Songti SC", "STSong", "Source Han Serif SC", "SimSun", serif;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "Consolas", monospace;

  --bg: #0f0d0c;
  --bg-soft: #1c1612;
  --ink: #ece5d8;
  --ink-dim: #ae9f91;
  --ink-faint: #7c6d5f;
  --rule: rgba(236, 229, 216, 0.14);
  --rule-strong: rgba(236, 229, 216, 0.3);
  --accent: #cf8b60;
  --paper: #ece5d8;
  --paper-ink: #221b17;
  --shadow: 0 30px 70px -40px rgba(0, 0, 0, 0.9);
}

[data-theme="day"] {
  --bg: #ebe5d9;
  --bg-soft: #e2dbcd;
  --ink: #1a1613;
  --ink-dim: #5b544c;
  --ink-faint: #8c8277;
  --rule: rgba(26, 22, 19, 0.16);
  --rule-strong: rgba(26, 22, 19, 0.34);
  --accent: #97411f;
  --paper: #faf5eb;
  --paper-ink: #1e1814;
  --shadow: 0 26px 60px -34px rgba(70, 50, 30, 0.55);
}

/* ---- reset --------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--cjk);
  font-weight: 400;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color 0.6s ease, color 0.6s ease;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
::selection { background: var(--accent); color: #fff6ef; }

.mono { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; }
.dim  { color: var(--ink-faint); }
.small { font-size: 10.5px; }

/* ---- grain --------------------------------------------------------------- */
.grain {
  position: fixed;
  inset: -50%;
  width: 200%;
  height: 200%;
  z-index: 90;
  pointer-events: none;
  background-image: url("img/grain.png");
  background-size: 190px 190px;
  opacity: 0.055;
  mix-blend-mode: overlay;
  animation: grain 1.1s steps(3) infinite;
  will-change: transform;
}
[data-theme="day"] .grain { opacity: 0.075; mix-blend-mode: multiply; }

/* a lamp off-frame: keeps the dark from feeling like a void */
.glow {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(70% 45% at 72% -8%, rgba(255, 178, 120, 0.14), transparent 70%),
    radial-gradient(55% 40% at 12% 100%, rgba(255, 190, 140, 0.05), transparent 70%);
}
[data-theme="day"] .glow {
  background:
    radial-gradient(70% 45% at 72% -8%, rgba(255, 196, 140, 0.32), transparent 70%),
    radial-gradient(55% 40% at 12% 100%, rgba(214, 160, 104, 0.10), transparent 70%);
}
.top, main, .foot { position: relative; z-index: 1; }
@keyframes grain {
  0%   { transform: translate(0, 0); }
  33%  { transform: translate(-22px, 14px); }
  66%  { transform: translate(16px, -20px); }
  100% { transform: translate(0, 0); }
}

/* ---- top bar ------------------------------------------------------------- */
.top {
  position: sticky;
  top: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px var(--gutter);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: border-color 0.5s, background-color 0.5s;
}
.top.pinned {
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom-color: var(--rule);
}
.brand {
  font-family: var(--serif);
  font-size: 17px;
  letter-spacing: 0.02em;
  text-decoration: none;
}
.top-right { display: flex; align-items: center; gap: 20px; }
.clock { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.16em; color: var(--ink-faint); }
.toggle {
  display: flex; align-items: center; gap: 7px;
  padding: 4px 0;
  border: 0; background: none; cursor: pointer;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.2em;
  color: var(--ink-faint);
  transition: opacity 0.3s;
}
.toggle i { font-style: normal; opacity: 0.35; }
.toggle span[data-k] { transition: color 0.3s; }
[data-theme="night"] .toggle span[data-k="night"],
[data-theme="day"]   .toggle span[data-k="day"] { color: var(--ink); }
.toggle:hover { opacity: 0.75; }

/* ---- hero ---------------------------------------------------------------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  column-gap: clamp(24px, 4vw, 72px);
  align-items: end;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(40px, 7vh, 92px) var(--gutter) clamp(24px, 4vh, 48px);
}
.eyebrow {
  margin: 0 0 clamp(18px, 3vh, 30px);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
h1 {
  margin: 0 0 clamp(20px, 3.4vh, 34px);
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(62px, 12.5vw, 188px);
  line-height: 0.83;
  letter-spacing: -0.035em;
  text-indent: -0.045em;
}
h1 .w1, h1 .w2 { display: block; }
h1 .w2 {
  font-style: italic;
  color: var(--accent);
  margin-left: 0.55em;
  letter-spacing: -0.01em;
}
.lede {
  margin: 0 0 14px;
  font-size: clamp(19px, 2.3vw, 29px);
  line-height: 1.62;
  letter-spacing: 0.01em;
}
.sub {
  margin: 0;
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(15px, 1.4vw, 19px);
  color: var(--ink-dim);
  letter-spacing: 0.01em;
}
.hero-fig { margin: 0; }
.hero-fig img {
  width: 100%;
  height: clamp(340px, 70vh, 760px);
  object-fit: cover;
  filter: saturate(0.95);
}
.hero-fig figcaption {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  text-align: right;
}
.hero-foot {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 20px;
  margin-top: clamp(28px, 5vh, 56px);
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  color: var(--ink-faint);
}
.down { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.22em; }
.down::after { content: " ↓"; }

/* ---- intro --------------------------------------------------------------- */
.intro {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  column-gap: clamp(16px, 2vw, 32px);
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(90px, 15vh, 190px) var(--gutter);
  border-top: 1px solid var(--rule);
}
.sec-no {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
  padding-top: 0.9em;
}
.intro-body { max-width: 32em; }
.intro-body p {
  margin: 0 0 0.15em;
  text-wrap: pretty;
  font-size: clamp(19px, 2.05vw, 26px);
  line-height: 2;
  letter-spacing: 0.01em;
}
.intro-body .last { color: var(--accent); }

/* ---- section shell ------------------------------------------------------- */
.sec {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(72px, 11vh, 140px) var(--gutter);
  border-top: 1px solid var(--rule);
}
.sec-head {
  display: grid;
  grid-template-columns: 72px auto 1fr;
  column-gap: clamp(16px, 2vw, 32px);
  align-items: baseline;
}
.sec-head h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 300;
  letter-spacing: 0.06em;
  line-height: 1.1;
}
.sec-en {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-faint);
  align-self: end;
  padding-bottom: 0.6em;
}
.sec-desc {
  max-width: 40em;
  margin: clamp(20px, 3vh, 34px) 0 clamp(34px, 5.5vh, 62px);
  padding-left: calc(72px + clamp(16px, 2vw, 32px));
  color: var(--ink-dim);
  font-size: 14.5px;
  line-height: 1.9;
}

/* ---- 01 fragments -------------------------------------------------------- */
.frags { list-style: none; margin: 0; padding: 0; }
.frags li {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) minmax(0, 250px);
  column-gap: clamp(16px, 2vw, 32px);
  align-items: baseline;
  padding: clamp(18px, 2.5vh, 30px) 0;
  border-top: 1px solid var(--rule);
  transition: background-color 0.5s;
}
.frags li:last-child { border-bottom: 1px solid var(--rule); }
.frags .n { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.12em; color: var(--ink-faint); }
.frags p {
  margin: 0;
  text-wrap: pretty;
  font-size: clamp(18px, 2.1vw, 26px);
  line-height: 1.75;
  letter-spacing: 0.015em;
  transition: color 0.6s;
}
.frags .en {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  text-align: right;
  opacity: 0.35;
  transition: opacity 0.5s;
}
.frags li:hover .en { opacity: 1; }
.frags li:hover p { color: var(--accent); }
.frags li.em p { color: var(--accent); }
.frags li.em .en { opacity: 0.7; }

/* ---- 02 letters ---------------------------------------------------------- */
.letters { display: grid; gap: clamp(26px, 4vw, 46px); max-width: 720px; }
.letter {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4.2vw, 52px) clamp(24px, 3.6vw, 48px);
  background-color: var(--paper);
  color: var(--paper-ink);
  box-shadow: var(--shadow);
  transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}
.letter::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("img/paper.jpg") center / cover no-repeat;
  mix-blend-mode: multiply;
  opacity: 0.55;
  pointer-events: none;
}
[data-theme="day"] .letter::before { opacity: 0.34; }
[data-theme="night"] .letter { filter: saturate(0.95); }
.l-meta, .letter p { position: relative; }
.letters .letter:nth-child(1) { transform: rotate(-0.7deg); }
.letters .letter:nth-child(2) { width: 88%; margin-left: auto; transform: rotate(0.55deg); }
.letters .letter:nth-child(3) { width: 74%; transform: rotate(-0.35deg); }
.letters .letter:hover { transform: rotate(0deg); }
.l-meta {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: clamp(20px, 3.4vh, 34px);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(34, 27, 23, 0.5);
}
.letter p {
  margin: 0 0 0.9em;
  text-wrap: pretty;
  font-size: clamp(15.5px, 1.32vw, 17.5px);
  line-height: 2.05;
  letter-spacing: 0.012em;
}
.letter .sign {
  margin: 1.7em 0 0;
  text-align: right;
  font-style: italic;
  color: rgba(34, 27, 23, 0.72);
}

/* ---- 03 keep ------------------------------------------------------------- */
.keep {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  column-gap: clamp(32px, 6vw, 88px);
  align-items: start;
}
.songs { list-style: none; margin: 0; padding: 0; }
.songs li {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  column-gap: clamp(12px, 2vw, 26px);
  padding: clamp(16px, 2.3vh, 24px) 0;
  border-top: 1px solid var(--rule);
}
.songs li:first-child { border-top: 0; padding-top: 0; }
.songs .n { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.12em; color: var(--ink-faint); padding-top: 0.45em; }
.songs .t { font-size: clamp(16.5px, 1.6vw, 20px); letter-spacing: 0.01em; }
.songs .a {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-left: 0.9em;
  white-space: nowrap;
}
.songs .note { margin: 0.55em 0 0; font-size: 13.5px; line-height: 1.8; color: var(--ink-dim); }

.things .memento { margin: 0; }
.things .memento img { width: 100%; height: auto; }
.things figcaption {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.objects { list-style: none; margin: clamp(26px, 4vh, 42px) 0 0; padding: 0; }
.objects li {
  padding: 13px 0;
  border-top: 1px solid var(--rule);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-dim);
}

/* ---- wide figure --------------------------------------------------------- */
.wide { margin: 0; }
.wide img { width: 100%; height: clamp(260px, 56vh, 600px); object-fit: cover; }
.wide figcaption .plain { text-transform: none; letter-spacing: 0.04em; }
.wide figcaption {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px var(--gutter) 0;
  border-bottom: 1px solid var(--rule);
}

/* ---- 04 about ------------------------------------------------------------ */
.about {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
  column-gap: clamp(32px, 6vw, 80px);
  align-items: start;
  margin-top: clamp(22px, 4vh, 46px);
}
.about-fig { margin: 0; }
.about-fig img { width: 100%; height: auto; filter: saturate(0.9); }
.about-body p {
  margin: 0 0 1.15em;
  font-size: clamp(15.5px, 1.45vw, 18.5px);
  line-height: 2.05;
  letter-spacing: 0.012em;
  max-width: 30em;
}
.about-body .big {
  margin-bottom: 0.25em;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.5;
  letter-spacing: 0.02em;
}
.about-body .small { margin-bottom: 2.2em; letter-spacing: 0.2em; }
.about-body em { font-family: var(--serif); font-style: italic; font-size: 1.1em; }
.about-body .last { color: var(--accent); }
.about-body .sign {
  margin-top: 3em;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--ink-faint);
}

/* ---- 05 write ------------------------------------------------------------ */
.write {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(90px, 14vh, 170px) var(--gutter) clamp(80px, 12vh, 140px);
  border-top: 1px solid var(--rule);
}
.write-h {
  margin: 0 0 0.35em;
  font-size: clamp(46px, 8.4vw, 116px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: 0.02em;
}
.write-p {
  margin: 0 0 clamp(30px, 5vh, 54px);
  color: var(--ink-dim);
  font-size: 15px;
  line-height: 2;
  max-width: 30em;
}
.mails { list-style: none; margin: 0; padding: 0; max-width: 660px; }
.mails li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 0;
  border-top: 1px solid var(--rule);
}
.mails li:last-child { border-bottom: 1px solid var(--rule); }
.mails a {
  position: relative;
  font-family: var(--serif);
  font-size: clamp(17px, 2.1vw, 25px);
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: color 0.4s;
}
.mails a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -3px;
  width: 100%; height: 1px;
  background: var(--rule-strong);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.55s cubic-bezier(0.16, 1, 0.3, 1);
}
.mails li:hover a { color: var(--accent); }
.mails li:hover a::after { transform: scaleX(1); }

/* ---- footer -------------------------------------------------------------- */
.foot {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 18px;
  flex-wrap: wrap;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px var(--gutter) 46px;
  border-top: 1px solid var(--rule);
  font-size: 12px;
  letter-spacing: 0.06em;
}
.foot > span:first-child { font-family: var(--serif); font-size: 15px; }

/* ---- reveal -------------------------------------------------------------- */
/* only hide when JS is really running, so the page is never blank */
.reveal { opacity: 1; }
html.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 1.05s cubic-bezier(0.16, 1, 0.3, 1),
    transform 1.05s cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: var(--d, 0ms);
}
html.js .reveal.in { opacity: 1; transform: none; }

/* ---- responsive ---------------------------------------------------------- */
@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; row-gap: clamp(28px, 5vh, 48px); padding-top: 40px; }
  .hero-fig img { height: clamp(300px, 46vh, 460px); }
  .hero-fig figcaption { text-align: left; }
  .intro, .frags li, .songs li { grid-template-columns: 44px minmax(0, 1fr); }
  .sec-head { grid-template-columns: 44px auto 1fr; }
  .sec-desc { padding-left: 44px; }
  .frags .en { grid-column: 2; text-align: left; margin-top: 7px; opacity: 0.4; }
  .keep, .about { grid-template-columns: 1fr; row-gap: clamp(32px, 6vh, 52px); }
  .about-fig { max-width: 420px; }
  .letters .letter:nth-child(2),
  .letters .letter:nth-child(3) { width: 100%; transform: rotate(-0.4deg); }
}

@media (max-width: 560px) {
  :root { --gutter: 22px; }
  h1 { font-size: clamp(54px, 17vw, 78px); }
  h1 .w2 { margin-left: 0.35em; }
  .hero-foot .mono { display: none; }
  .top-right { gap: 14px; }
  .clock { display: none; }
  .write-h { font-size: clamp(40px, 13vw, 64px); }
  .frags li { grid-template-columns: 30px minmax(0, 1fr); column-gap: 12px; }
  .frags .n { font-size: 9.5px; }
  .frags p { font-size: 17px; line-height: 1.85; }
  .songs .a { display: block; margin: 5px 0 0; }
  .songs li { grid-template-columns: 34px minmax(0, 1fr); column-gap: 12px; }
  .sec { padding-block: 64px; }
  .intro { padding-block: 76px; }
  .letter .sign { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .grain { animation: none; }
  html.js .reveal { opacity: 1; transform: none; transition: none; }
  .letters .letter, .mails a::after { transition: none; }
}