/* =====================================================================
   loveletter.earth
   Aesthetic: paper · soil · dawn light. The letter is the hero.
   No dark mode. Motion is slow and organic only.
   ===================================================================== */

:root {
  /* Earth palette */
  --terracotta:   #b5563a;
  --terracotta-2: #9a4530;
  --moss:         #5f6f48;
  --moss-2:       #46522f;
  --parchment:    #f4ecd8;
  --parchment-2:  #efe4cc;
  --dawn-gold:    #e0b070;
  --dawn-gold-2:  #cf9a52;

  --ink:        #3a3026;   /* warm near-black for body text */
  --ink-soft:   #6a5d4c;   /* muted brown for secondary text */
  --paper:      #fbf6ea;   /* letter paper */
  --paper-edge: #e9dcc0;

  --shadow-soft: 0 18px 50px -28px rgba(74, 56, 33, 0.55);
  --shadow-card: 0 30px 70px -40px rgba(74, 56, 33, 0.7);

  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body:    'EB Garamond', Georgia, serif;
  --font-hand:    'Caveat', 'Cormorant Garamond', cursive;

  --maxw: 1100px;
  --ease-organic: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--ink);
  background-color: var(--parchment);
  /* Linen / old-paper atmosphere: layered soft dawn light + fine grain */
  background-image:
    radial-gradient(140% 90% at 12% -10%, rgba(224, 176, 112, 0.28), transparent 55%),
    radial-gradient(120% 80% at 92% 0%, rgba(181, 86, 58, 0.10), transparent 50%),
    radial-gradient(130% 120% at 50% 120%, rgba(95, 111, 72, 0.14), transparent 55%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.045'/%3E%3C/svg%3E");
  background-attachment: fixed, fixed, fixed, scroll;
}
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }
a { color: var(--terracotta); text-decoration-thickness: 1px; text-underline-offset: 3px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  font-family: var(--font-body);
  font-size: 1.02rem;
  letter-spacing: 0.02em;
  padding: 0.85em 1.7em;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  transition: transform 0.5s var(--ease-organic), background-color 0.5s var(--ease-organic),
    color 0.5s var(--ease-organic), border-color 0.5s var(--ease-organic), box-shadow 0.5s var(--ease-organic);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--solid {
  background: var(--terracotta);
  color: var(--paper);
  box-shadow: var(--shadow-soft);
}
.btn--solid:hover { background: var(--terracotta-2); }

.btn--outline {
  background: transparent;
  color: var(--moss-2);
  border-color: var(--moss);
}
.btn--outline:hover { background: rgba(95, 111, 72, 0.1); }

.btn--ghost {
  background: transparent;
  color: var(--ink-soft);
  border: 1px dashed var(--paper-edge);
  border-color: rgba(106, 93, 76, 0.4);
}
.btn--ghost:hover { color: var(--terracotta); border-color: var(--terracotta); }

.btn--read-another { margin: 1.6rem auto 0; display: flex; }
.btn--send { width: 100%; margin-top: 0.5rem; padding-block: 1em; font-size: 1.1rem; }

/* ============================ HERO ============================ */
.hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  padding: 1.4rem clamp(1.2rem, 5vw, 3rem) 3rem;
  position: relative;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--maxw);
  width: 100%;
  margin: 0 auto;
}
.wordmark {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--moss-2);
}
.wordmark__dot { color: var(--terracotta); }
.topbar__links { display: flex; gap: 1.6rem; }
.topbar__links a {
  font-size: 1.05rem;
  color: var(--ink-soft);
  text-decoration: none;
  position: relative;
}
.topbar__links a::after {
  content: '';
  position: absolute; left: 0; bottom: -4px;
  width: 100%; height: 1px;
  background: var(--terracotta);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.5s var(--ease-organic);
}
.topbar__links a:hover { color: var(--terracotta); }
.topbar__links a:hover::after { transform: scaleX(1); }

.hero__inner {
  max-width: 760px;
  margin: auto;
  width: 100%;
  text-align: center;
  padding-top: 2rem;
}
.hero__eyebrow {
  font-family: var(--font-hand);
  font-size: 1.5rem;
  color: var(--terracotta);
  margin: 0 0 0.4rem;
  opacity: 0;
  animation: rise 1.4s var(--ease-organic) 0.1s forwards;
}
.hero__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.1rem, 6vw, 3.7rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 2rem;
  color: var(--ink);
  text-wrap: balance;
  opacity: 0;
  animation: rise 1.6s var(--ease-organic) 0.25s forwards;
}
.hero__title em { color: var(--moss-2); font-style: italic; }

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  justify-content: center;
  margin-top: 2.2rem;
}
.hero__counter {
  margin-top: 2rem;
  font-family: var(--font-hand);
  font-size: 1.4rem;
  color: var(--moss-2);
}
.hero__counter #letter-count { color: var(--terracotta); font-weight: 600; }

.scroll-cue {
  position: absolute;
  left: 50%; bottom: 1.4rem;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  font-family: var(--font-hand);
  font-size: 1.1rem;
  color: var(--ink-soft);
  opacity: 0;
  animation: fade 2s ease 1.4s forwards;
}
.scroll-cue__line {
  width: 1px; height: 42px;
  background: linear-gradient(var(--ink-soft), transparent);
  animation: breathe 3.4s var(--ease-organic) infinite;
}

/* ============================ LETTER CARD ============================ */
.letter-stage { perspective: 1200px; }

.letter {
  position: relative;
  background: var(--paper);
  background-image:
    linear-gradient(165deg, rgba(255,255,255,0.5), transparent 40%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='p'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.7' numOctaves='2'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23p)' opacity='0.05'/%3E%3C/svg%3E");
  border: 1px solid var(--paper-edge);
  border-radius: 4px;
  box-shadow: var(--shadow-card);
  padding: clamp(2rem, 5vw, 3.4rem) clamp(1.6rem, 5vw, 3.4rem) clamp(1.8rem, 4vw, 2.6rem);
  max-width: 640px;
  margin-inline: auto;
  text-align: left;
}
/* a faint torn/aged top edge feel via inner highlight */
.letter::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: 4px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.6), inset 0 0 60px rgba(224,176,112,0.08);
  pointer-events: none;
}

.letter__note {
  font-style: italic;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 16rem;
  margin: 0 0 1.6rem auto;
  text-align: right;
  opacity: 0.85;
  border-right: 2px solid var(--dawn-gold);
  padding-right: 0.9rem;
}

.letter__body {
  font-size: clamp(1.15rem, 2.4vw, 1.32rem);
  line-height: 1.85;
  color: var(--ink);
  white-space: pre-wrap;
  margin: 0;
}
.letter__body .dropcap {
  float: left;
  font-family: var(--font-display);
  font-size: 3.6em;
  line-height: 0.74;
  padding: 0.05em 0.1em 0 0;
  color: var(--terracotta);
  font-weight: 500;
}

.letter__sign {
  margin-top: 2rem;
  text-align: right;
}
.letter__sign-name {
  font-family: var(--font-hand);
  font-size: 1.7rem;
  color: var(--moss-2);
  line-height: 1.1;
}
.letter__sign-loc {
  display: block;
  font-size: 0.92rem;
  font-style: italic;
  color: var(--ink-soft);
  margin-top: 0.2rem;
}

/* slow organic fade-in for letters (re-triggered on swap) */
.letter.is-entering { animation: letterIn 1.1s var(--ease-organic) forwards; }
.letter.is-leaving  { animation: letterOut 0.5s var(--ease-organic) forwards; }

/* ============================ SECTIONS ============================ */
.section {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(4rem, 11vw, 8rem) clamp(1.2rem, 5vw, 2.4rem);
}
.section--write { border-top: 1px solid rgba(106,93,76,0.14); }

.section__head { text-align: center; max-width: 620px; margin: 0 auto clamp(2.4rem, 5vw, 3.6rem); }
.section__index {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.3rem;
  color: var(--dawn-gold-2);
  letter-spacing: 0.3em;
  margin: 0 0 0.4rem;
  text-transform: uppercase;
}
.section__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 0.6rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.section__lede {
  font-size: 1.15rem;
  color: var(--ink-soft);
  margin: 0;
  font-style: italic;
}

/* ---------- tabs ---------- */
.tabs__nav {
  display: flex;
  gap: 0.4rem;
  justify-content: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}
.tabs__tab {
  background: transparent;
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--ink-soft);
  padding: 0.5em 1.2em;
  border-radius: 999px;
  transition: all 0.5s var(--ease-organic);
}
.tabs__tab:hover { color: var(--terracotta); }
.tabs__tab.is-active {
  color: var(--paper);
  background: var(--moss-2);
  box-shadow: var(--shadow-soft);
}

/* ---------- write card / form ---------- */
.write-card {
  max-width: 640px;
  margin-inline: auto;
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-radius: 6px;
  box-shadow: var(--shadow-card);
  padding: clamp(1.6rem, 4vw, 2.6rem);
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
}
.write-card__inputs { display: flex; gap: 0.7rem; flex-wrap: wrap; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  background: rgba(95,111,72,0.07);
  border: 1px dashed rgba(106,93,76,0.35);
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 0.5em 1em;
  font-size: 0.92rem;
}
.chip--disabled { cursor: not-allowed; opacity: 0.7; }
.chip__soon {
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--terracotta);
  background: rgba(181,86,58,0.1);
  padding: 0.15em 0.5em;
  border-radius: 999px;
}

.field { display: flex; flex-direction: column; gap: 0.4rem; flex: 1; }
.field__label {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--moss-2);
  letter-spacing: 0.02em;
}
.field__label em { color: var(--ink-soft); font-size: 0.9em; }
.field__input, .field__textarea {
  font-family: var(--font-body);
  font-size: 1.1rem;
  color: var(--ink);
  background: rgba(255,255,255,0.55);
  border: 1px solid var(--paper-edge);
  border-radius: 4px;
  padding: 0.7em 0.9em;
  transition: border-color 0.4s var(--ease-organic), box-shadow 0.4s var(--ease-organic), background 0.4s;
  width: 100%;
}
.field__textarea { resize: vertical; line-height: 1.7; min-height: 9rem; }
.field__input:focus, .field__textarea:focus {
  outline: none;
  border-color: var(--moss);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(95,111,72,0.14);
}
.field__hint {
  font-style: italic;
  font-size: 0.95rem;
  color: var(--ink-soft);
  min-height: 1.2em;
  opacity: 0;
  transition: opacity 0.6s var(--ease-organic);
}
.field__hint.is-shown { opacity: 0.85; }
.field-row { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ---------- switch ---------- */
.switch { display: flex; align-items: center; gap: 0.8rem; cursor: pointer; user-select: none; }
.switch input { position: absolute; opacity: 0; pointer-events: none; }
.switch__track {
  width: 50px; height: 28px;
  background: rgba(106,93,76,0.25);
  border-radius: 999px;
  position: relative;
  transition: background 0.5s var(--ease-organic);
  flex-shrink: 0;
}
.switch__thumb {
  position: absolute; top: 3px; left: 3px;
  width: 22px; height: 22px;
  background: var(--paper);
  border-radius: 50%;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
  transition: transform 0.5s var(--ease-organic);
}
.switch input:checked + .switch__track { background: var(--moss); }
.switch input:checked + .switch__track .switch__thumb { transform: translateX(22px); }
.switch input:focus-visible + .switch__track { box-shadow: 0 0 0 3px rgba(95,111,72,0.3); }
.switch__label { font-size: 1.02rem; color: var(--ink); }

/* ---------- afterglow (post-send) ---------- */
.afterglow {
  max-width: 760px;
  margin: 2.5rem auto 0;
  animation: rise 1s var(--ease-organic) forwards;
}
.afterglow__reply {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  text-align: center;
  color: var(--terracotta);
  margin: 0 0 2.4rem;
}
.invites { display: grid; grid-template-columns: 1fr 1fr; gap: 1.4rem; }
.invite {
  background: rgba(251,246,234,0.7);
  border: 1px solid var(--paper-edge);
  border-radius: 6px;
  padding: 1.6rem;
}
.invite__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.35rem;
  margin: 0 0 0.4rem;
  color: var(--ink);
}
.invite__sub { font-size: 0.98rem; color: var(--ink-soft); margin: 0 0 1.1rem; font-style: italic; }
.invite__form { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.invite__form--col { flex-direction: column; align-items: flex-start; }
.invite__form .field__input { flex: 1; min-width: 0; }
.invite__form .btn { white-space: nowrap; }

/* ---------- frequency radios ---------- */
.freq { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.freq__opt { position: relative; }
.freq__opt input { position: absolute; opacity: 0; pointer-events: none; }
.freq__opt span {
  display: inline-block;
  padding: 0.45em 1em;
  border: 1px solid var(--paper-edge);
  border-radius: 999px;
  font-size: 0.98rem;
  color: var(--ink-soft);
  transition: all 0.4s var(--ease-organic);
}
.freq__opt input:checked + span {
  background: var(--dawn-gold);
  border-color: var(--dawn-gold-2);
  color: var(--ink);
}
.freq__opt input:focus-visible + span { box-shadow: 0 0 0 3px rgba(224,176,112,0.4); }

/* ============================ POEMS ============================ */
.poem-stage { perspective: 1200px; }
.poem {
  max-width: 640px;
  margin-inline: auto;
  border-radius: 6px;
  padding: clamp(2rem, 5vw, 3.2rem);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--paper-edge);
  position: relative;
  overflow: hidden;
}
.poem.is-entering { animation: letterIn 1.1s var(--ease-organic) forwards; }
.poem.is-leaving  { animation: letterOut 0.5s var(--ease-organic) forwards; }

/* subtle per-texture backgrounds (moss / stone / bark / water) */
.poem--moss  { background:
  radial-gradient(120% 100% at 20% 0%, rgba(95,111,72,0.18), transparent 60%), var(--paper); }
.poem--stone { background:
  radial-gradient(120% 100% at 80% 10%, rgba(106,93,76,0.16), transparent 60%), var(--paper); }
.poem--bark  { background:
  repeating-linear-gradient(95deg, rgba(120,80,50,0.05) 0 6px, transparent 6px 14px), var(--paper); }
.poem--water { background:
  radial-gradient(140% 120% at 50% -20%, rgba(120,150,170,0.18), transparent 55%), var(--paper); }

.poem__title {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: 1.6rem;
  margin: 0 0 1.2rem;
  color: var(--moss-2);
}
.poem__body {
  font-size: clamp(1.12rem, 2.4vw, 1.28rem);
  line-height: 1.85;
  white-space: pre-wrap;
  margin: 0 0 1.6rem;
  color: var(--ink);
}
.poem__body--placeholder { font-style: italic; color: var(--ink-soft); font-size: 1.02rem; line-height: 1.7; }
.poem__meta {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--paper-edge);
  padding-top: 1rem;
}
.poem__meta strong { color: var(--ink); font-weight: 600; }

.poems__cta { text-align: center; margin-top: 2.4rem; font-style: italic; color: var(--ink-soft); }

/* ============================ FOOTER ============================ */
.footer {
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(95,111,72,0.16), transparent 60%),
    var(--parchment-2);
  border-top: 1px solid rgba(106,93,76,0.18);
  padding: clamp(4rem, 9vw, 7rem) clamp(1.2rem, 5vw, 2.4rem) 3rem;
  text-align: center;
}
.subscribe { max-width: 480px; margin: 0 auto; text-align: left; }
.subscribe__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  text-align: center;
  margin: 0 0 0.4rem;
  color: var(--ink);
}
.subscribe__sub { text-align: center; font-style: italic; color: var(--ink-soft); margin: 0 0 2rem; }
.subscribe__form { display: flex; flex-direction: column; gap: 1.1rem; }
.subscribe__form .freq { justify-content: center; }
.subscribe__privacy {
  font-size: 0.92rem;
  color: var(--ink-soft);
  text-align: center;
  margin: 1.2rem 0 0;
  font-style: italic;
}

.footer__quote {
  max-width: 620px;
  margin: clamp(3.5rem, 8vw, 6rem) auto 0;
  padding: 0;
  border: 0;
}
.footer__quote-zh {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.4vw, 2rem);
  line-height: 1.7;
  color: var(--moss-2);
  margin: 0 0 0.8rem;
}
.footer__quote-en { font-style: italic; color: var(--ink); margin: 0 0 0.8rem; }
.footer__quote cite { font-style: normal; font-size: 0.95rem; color: var(--ink-soft); }

.footer__credit {
  margin: clamp(2.5rem, 6vw, 4rem) auto 0;
  max-width: 460px;
  font-size: 0.9rem;
  font-style: italic;
  color: var(--ink-soft);
  opacity: 0.85;
}

/* ============================ TOAST ============================ */
.toast {
  position: fixed;
  left: 50%; bottom: 2rem;
  transform: translateX(-50%) translateY(1rem);
  background: var(--moss-2);
  color: var(--paper);
  font-size: 1.05rem;
  padding: 0.9em 1.6em;
  border-radius: 999px;
  box-shadow: var(--shadow-card);
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.6s var(--ease-organic), transform 0.6s var(--ease-organic);
  max-width: min(90vw, 30rem);
  text-align: center;
}
.toast.is-shown { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============================ ANIMATIONS ============================ */
@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes breathe {
  0%, 100% { opacity: 0.3; transform: scaleY(0.7); }
  50%      { opacity: 1;   transform: scaleY(1); }
}
@keyframes letterIn {
  from { opacity: 0; transform: translateY(26px) rotateX(4deg); }
  to   { opacity: 1; transform: translateY(0) rotateX(0); }
}
@keyframes letterOut {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(-14px); }
}

/* ============================ RESPONSIVE ============================ */
@media (max-width: 720px) {
  body { font-size: 1.08rem; }
  .topbar__links { gap: 1rem; }
  .topbar__links a { font-size: 0.98rem; }
  .invites { grid-template-columns: 1fr; }
  .field-row { flex-direction: column; }
  .letter__note { max-width: 100%; margin-left: 0; }
}

@media (max-width: 420px) {
  .topbar__links { display: none; }
  .hero__ctas .btn { width: 100%; }
}

/* ============================ MOTION SAFETY ============================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}