/* =========================================================
   모카에게 보내는 편지 — letters.css
   카운트다운 페이지(style.css)와 같은 색·카드·이모지 움직임을 씁니다.
   색을 바꾸려면 아래 :root 변수만 고치면 됩니다.
   ========================================================= */
:root {
  --letter-bg-1: #EEF1F8;
  --letter-bg-2: #DDD9ED;
  --letter-bg-3: #F3E3EB;
  --letter-text: #34354A;
  --letter-text-sub: #686A80;
  --letter-accent: #77649C;
  --letter-pink: #C58EA5;
  --letter-warm: #E8D5AD;
  --letter-paper: #FFFDF8;
  --letter-card-bg: rgba(255, 255, 255, 0.58);
  --letter-card-border: rgba(255, 255, 255, 0.78);
  --letter-danger: #A4466A;

  --card-shadow: 0 12px 36px rgba(84, 72, 120, 0.12), 0 2px 8px rgba(52, 53, 74, 0.06);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-pill: 999px;
  --paper-line: 30px;
  --paper-pad-y: 14px;

  --font-emoji: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji";
  --font-ko: "Pretendard", "Pretendard Variable", "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", "맑은 고딕",
    "Hiragino Sans", "Yu Gothic", "Meiryo", system-ui, -apple-system, "Segoe UI", sans-serif, var(--font-emoji);
}

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

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  background: var(--letter-bg-2);
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  font-family: var(--font-ko);
  color: var(--letter-text);
  line-height: 1.6;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

p,
h1,
h2,
ul {
  margin: 0;
}

button,
input,
textarea {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--letter-accent);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 배경: 그라데이션 + 중앙 광원 + 무대 조명 ---------- */
.stage-light {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 55% 42% at 50% 36%, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0) 70%),
    radial-gradient(ellipse 36% 26% at 50% 26%, rgba(232, 213, 173, 0.34), rgba(232, 213, 173, 0) 72%),
    radial-gradient(ellipse 60% 40% at 50% 100%, rgba(197, 142, 165, 0.16), rgba(197, 142, 165, 0) 70%),
    linear-gradient(165deg, var(--letter-bg-1) 0%, var(--letter-bg-2) 52%, var(--letter-bg-3) 100%);
}

.stage-light::before {
  content: "";
  position: absolute;
  top: -5%;
  left: 50%;
  width: min(760px, 120vw);
  height: 75%;
  transform: translateX(-50%);
  background: linear-gradient(to bottom, rgba(232, 213, 173, 0.3), rgba(255, 255, 255, 0.12) 55%, rgba(255, 255, 255, 0));
  clip-path: polygon(42% 0, 58% 0, 88% 100%, 12% 100%);
  filter: blur(18px);
  animation: light-breathe 12s ease-in-out infinite alternate;
}

@keyframes light-breathe {
  from { opacity: 0.7; }
  to { opacity: 1; }
}

/* ---------- 떠다니는 이모지 (장식, 카드 뒤) ---------- */
.emoji-layer {
  position: fixed;
  inset: 0;
  z-index: 1;
  overflow: hidden;
  pointer-events: none;
  user-select: none;
  -webkit-user-select: none;
}

.emoji {
  position: absolute;
  top: calc(var(--y) * 1%);
  left: clamp(0px, calc(var(--x) * 1% - var(--size) / 2), calc(100% - var(--size)));
  font-family: var(--font-emoji), sans-serif;
  font-size: var(--size);
  line-height: 1;
  opacity: var(--alpha);
  animation-duration: var(--dur);
  animation-delay: var(--delay);
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  will-change: transform, opacity;
}

.emoji--cheer {
  filter: saturate(0.85);
}

.emoji.is-fall { animation-name: emoji-fall; }
.emoji.is-sway { animation-name: emoji-sway; animation-direction: alternate; }
.emoji.is-rise { animation-name: emoji-rise; }
.emoji.is-glow { animation-name: emoji-glow; animation-direction: alternate; }

/* 천천히 내려오기 */
@keyframes emoji-fall {
  0% { transform: translate(0, -40px) rotate(-6deg); opacity: 0; }
  15% { opacity: var(--alpha); }
  50% { transform: translate(8px, 20px) rotate(4deg); }
  85% { opacity: var(--alpha); }
  100% { transform: translate(0, 80px) rotate(-4deg); opacity: 0; }
}

/* 좌우 흔들림 + 작은 회전 */
@keyframes emoji-sway {
  0% { transform: translate(-12px, -8px) rotate(-10deg); }
  50% { transform: translate(4px, 6px) rotate(3deg); }
  100% { transform: translate(12px, 14px) rotate(10deg); }
}

/* 부드럽게 위로 떠오르기 */
@keyframes emoji-rise {
  0% { transform: translate(0, 40px) scale(0.92); opacity: 0; }
  18% { opacity: var(--alpha); }
  50% { transform: translate(-8px, -10px) scale(1); }
  82% { opacity: var(--alpha); }
  100% { transform: translate(0, -70px) scale(1.04); opacity: 0; }
}

/* 은은한 확대·축소 + 밝기 변화 */
@keyframes emoji-glow {
  0% { transform: translateY(10px) scale(0.86); opacity: calc(var(--alpha) * 0.45); filter: saturate(0.85) brightness(0.96); }
  100% { transform: translateY(-14px) scale(1.12); opacity: var(--alpha); filter: saturate(0.85) brightness(1.1); }
}

/* 탭이 보이지 않을 때는 멈춤 */
.is-page-hidden .emoji,
.is-page-hidden .stage-light::before,
.is-page-hidden .mini-envelope {
  animation-play-state: paused;
}

/* ---------- 페이지 뼈대 ---------- */
.page {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: max(12px, env(safe-area-inset-top)) 16px max(20px, env(safe-area-inset-bottom));
}

.top-bar {
  width: 100%;
  max-width: 600px;
  display: flex;
  justify-content: flex-start;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 36px;
  padding: 6px 14px;
  border: 1px solid var(--letter-card-border);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.6);
  color: var(--letter-accent);
  font-size: 0.8rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(52, 53, 74, 0.06);
  transition: background-color 0.2s ease;
}

.back-link:hover {
  background: rgba(255, 255, 255, 0.9);
}

.content {
  flex: 1 0 auto;
  width: 100%;
  max-width: 600px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 14px 0 6px;
}

.eyebrow {
  align-self: center;
  padding: 5px 14px;
  border: 1px solid var(--letter-card-border);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.5);
  color: var(--letter-accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
}

/* ---------- 카드 공통 ---------- */
.card {
  position: relative;
  padding: 22px 20px;
  border: 1px solid var(--letter-card-border);
  border-radius: var(--radius-lg);
  background: var(--letter-card-bg);
  box-shadow: var(--card-shadow);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .card {
    background: rgba(255, 255, 255, 0.86);
  }
}

/* ---------- 제목 카드 ---------- */
.card--hero {
  padding-top: 24px;
  padding-bottom: 24px;
  overflow: hidden;
  text-align: center;
}

.card--hero::before {
  content: "";
  position: absolute;
  top: -60px;
  left: 50%;
  width: 240px;
  height: 120px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, rgba(232, 213, 173, 0.55), rgba(232, 213, 173, 0) 70%);
  pointer-events: none;
}

.hero-title {
  position: relative;
  margin-top: 12px;
  font-size: clamp(1.55rem, 7vw, 2.05rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.hero-subtitle {
  position: relative;
  margin-top: 10px;
  color: var(--letter-accent);
  font-size: 1rem;
  font-weight: 600;
}

.hero-lead {
  position: relative;
  margin-top: 4px;
  color: var(--letter-text-sub);
  font-size: 0.9rem;
}

/* ---------- 라벤더 봉투 + 핑크 하트 봉인 ---------- */
.mini-envelope {
  position: relative;
  width: 84px;
  aspect-ratio: 3 / 2;
  margin: 0 auto;
  animation: envelope-float 6s ease-in-out infinite alternate;
}

.mini-envelope > span {
  position: absolute;
}

.mini-envelope__back {
  inset: 0;
  border-radius: 9px;
  background: linear-gradient(180deg, #E6DFF1, #D8CFE8);
  box-shadow: 0 6px 16px rgba(84, 72, 120, 0.16);
}

.mini-envelope__front {
  inset: 0;
  border-radius: 9px;
  background: linear-gradient(160deg, #F5F1FA, #E7DEF1);
  clip-path: polygon(0 0, 50% 56%, 100% 0, 100% 100%, 0 100%);
}

.mini-envelope__flap {
  top: 0;
  left: 0;
  right: 0;
  height: 60%;
  border-radius: 9px 9px 0 0;
  background: linear-gradient(180deg, #DDD2EC, #CFC2E4);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
}

.mini-envelope__seal {
  top: 60%;
  left: 50%;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: var(--letter-pink);
  color: #fff;
  font-size: 0.72rem;
  line-height: 1;
  box-shadow: 0 3px 8px rgba(197, 142, 165, 0.4);
}

.mini-envelope--sent {
  width: 96px;
}

@keyframes envelope-float {
  from { transform: translateY(2px); }
  to { transform: translateY(-4px); }
}

/* ---------- 편지 카드 ---------- */
.card--letter {
  padding: 24px 20px 22px;
}

.letter-to {
  color: var(--letter-accent);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.22em;
}

.letter-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 14px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.field-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
}

.field-label {
  font-size: 0.92rem;
  font-weight: 700;
}

.field-optional {
  color: var(--letter-text-sub);
  font-size: 0.8rem;
  font-weight: 500;
}

.field-count,
.field-meta {
  color: var(--letter-text-sub);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

.field-meta {
  text-align: right;
}

.field-count.is-over,
.field-meta.is-over {
  color: var(--letter-danger);
  font-weight: 700;
}

.field-hint {
  color: var(--letter-text-sub);
  font-size: 0.82rem;
}

.field-error,
.form-error {
  color: var(--letter-danger);
  font-size: 0.84rem;
  font-weight: 600;
}

.form-error {
  padding: 10px 14px;
  border: 1px solid rgba(164, 70, 106, 0.22);
  border-radius: 14px;
  background: rgba(255, 244, 248, 0.85);
}

.form-status {
  color: var(--letter-text-sub);
  font-size: 0.84rem;
  text-align: center;
}

/* 16px 이상이라 iOS 에서 입력할 때 화면이 확대되지 않음 */
.text-input {
  width: 100%;
  min-height: 48px;
  padding: 11px 16px;
  border: 1px solid rgba(119, 100, 156, 0.22);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.82);
  font-size: 16px;
  line-height: 1.5;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.text-input::placeholder,
.paper-input::placeholder {
  color: #9A9BB0;
}

.text-input:focus,
.paper-input:focus {
  outline: none;
  border-color: var(--letter-accent);
  box-shadow: 0 0 0 3px rgba(119, 100, 156, 0.28);
}

.text-input[aria-invalid="true"],
.paper-input[aria-invalid="true"] {
  border-color: var(--letter-danger);
}

/* 편지지: 옅은 가로줄이 글자 행간(30px)과 맞고, 스크롤하면 줄도 함께 움직임 */
.paper {
  position: relative;
}

.paper-input {
  display: block;
  width: 100%;
  min-height: calc(var(--paper-line) * 8 + var(--paper-pad-y) * 2);
  max-height: 62vh;
  padding: var(--paper-pad-y) 18px;
  border: 1px solid rgba(119, 100, 156, 0.22);
  border-radius: var(--radius-md);
  background-color: var(--letter-paper);
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent calc(var(--paper-line) - 1px),
    rgba(119, 100, 156, 0.13) calc(var(--paper-line) - 1px),
    rgba(119, 100, 156, 0.13) var(--paper-line)
  );
  background-attachment: local;
  background-position: 0 var(--paper-pad-y);
  background-size: 100% var(--paper-line);
  font-size: 16px;
  line-height: var(--paper-line);
  resize: vertical;
  overflow-y: auto;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
  box-shadow: inset 0 1px 3px rgba(52, 53, 74, 0.04);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-notes {
  display: grid;
  gap: 4px;
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.55);
  color: var(--letter-text-sub);
  font-size: 0.84rem;
  list-style: none;
}

.form-notes li::before,
.guide-list li::before {
  content: "·";
  content: "·" / "";
  margin-right: 6px;
  color: var(--letter-pink);
  font-weight: 800;
}

/* ---------- 버튼 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  font-size: 0.96rem;
  font-weight: 700;
  cursor: pointer;
  transition: box-shadow 0.2s ease, opacity 0.2s ease;
}

.btn--primary {
  border: 0;
  background: linear-gradient(135deg, var(--letter-accent), #8E7AB4);
  color: #fff;
  box-shadow: 0 6px 18px rgba(119, 100, 156, 0.28);
}

.btn--primary:hover:not(:disabled) {
  box-shadow: 0 8px 22px rgba(119, 100, 156, 0.36);
}

.btn:disabled {
  cursor: default;
  opacity: 0.62;
}

.btn--block {
  width: 100%;
}

.chip-btn {
  min-height: 34px;
  padding: 6px 14px;
  border: 1px solid var(--letter-card-border);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.6);
  color: var(--letter-accent);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(52, 53, 74, 0.06);
  transition: background-color 0.2s ease;
}

.chip-btn:hover {
  background: rgba(255, 255, 255, 0.9);
}

.chip-btn--small {
  min-height: 30px;
  padding: 4px 12px;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--letter-text-sub);
}

/* ---------- 결과 화면 (보냄 / 제한 중) ---------- */
.result-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  padding: 18px 8px 6px;
  text-align: center;
}

.result-title {
  margin-top: 10px;
  font-size: clamp(1.2rem, 5.4vw, 1.4rem);
  font-weight: 800;
  line-height: 1.4;
}

.result-title:focus {
  outline: none;
}

.result-title:focus-visible {
  outline: 3px solid var(--letter-accent);
  outline-offset: 4px;
  border-radius: 8px;
}

.result-title::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  margin: 10px auto 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--letter-pink), var(--letter-warm));
}

.result-text,
.result-hint {
  color: var(--letter-text-sub);
  font-size: 0.92rem;
}

.result-next {
  margin-top: 8px;
  font-size: 0.92rem;
  font-weight: 600;
}

.result-next time {
  color: var(--letter-accent);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.result-remaining {
  padding: 4px 16px;
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.62);
  color: var(--letter-text-sub);
  font-size: 0.84rem;
}

.remaining {
  color: var(--letter-text);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.result-hint {
  margin-top: 6px;
  font-size: 0.82rem;
}

/* ---------- 안내 카드 ---------- */
.card--guide {
  padding: 20px 20px 18px;
}

.guide-title {
  color: var(--letter-accent);
  font-size: 0.98rem;
  font-weight: 800;
}

.guide-list {
  display: grid;
  gap: 6px;
  margin-top: 10px;
  padding: 0;
  color: var(--letter-text-sub);
  font-size: 0.86rem;
  list-style: none;
}

/* ---------- 푸터 ---------- */
.site-footer {
  width: 100%;
  max-width: 600px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding-top: 12px;
  text-align: center;
}

.utility {
  margin-bottom: 10px;
}

.footer-name {
  color: var(--letter-accent);
  font-size: 0.84rem;
  font-weight: 700;
}

.footer-line {
  color: var(--letter-text-sub);
  font-size: 0.76rem;
}

.noscript-note {
  position: relative;
  z-index: 3;
  margin: 0 auto 20px;
  max-width: 600px;
  padding: 0 16px;
  color: var(--letter-text-sub);
  font-size: 0.85rem;
  text-align: center;
}

/* ---------- 화면 크기 ---------- */
@media (max-width: 360px) {
  .card { padding-left: 16px; padding-right: 16px; }
  .paper-input { padding-left: 14px; padding-right: 14px; }
}

@media (min-width: 768px) {
  .page { padding: 20px 28px 28px; }
  .card { padding-left: 28px; padding-right: 28px; }
}

/* ---------- 움직임 줄이기 ('움직임 끄기' 또는 기기 설정. '움직임 켜기'를 고르면 .motion-on 이 기기 설정을 덮어씀) ---------- */
.motion-off *,
.motion-off *::before,
.motion-off *::after {
  animation: none !important;
  transition: none !important;
}

@media (prefers-reduced-motion: reduce) {
  html:not(.motion-on) *,
  html:not(.motion-on) *::before,
  html:not(.motion-on) *::after {
    animation: none !important;
    transition: none !important;
  }
}