/* ============================================================
   永远爱玲 — 视觉基调
   一封摊开的信 / 一本翻开的相册。
   纸感底色，深褐墨色文字，尘玫瑰作为唯一的强调色。
   ============================================================ */

:root {
  --paper: #faf5ee;
  --paper-deep: #f3ead9;
  --ink: #34281f;
  --ink-soft: #6b5a4e;
  --ink-faint: #9c8b7c;
  --rose: #b8697a;
  --rose-deep: #9c4f60;
  --line: #e4d6c6;
  --card: #fffdf9;
  --shadow: rgba(52, 40, 31, 0.12);

  --serif: "Noto Serif SC", "Songti SC", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* 纸张纹理：极浅的纵向渐变 + 顶部一条细线，像信纸的抬头线 */
body.page-auth {
  background: radial-gradient(ellipse at top, var(--paper-deep) 0%, var(--paper) 60%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 20px;
}

a {
  color: var(--rose-deep);
}

:focus-visible {
  outline: 2px solid var(--rose);
  outline-offset: 3px;
}

/* ---------------- 认证页 ---------------- */

.letter {
  width: 100%;
  max-width: 440px;
  padding: 56px 44px 48px;
  position: relative;
}

.letter::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 28px;
  background: var(--line);
}

.letter-mark {
  text-align: center;
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
  margin-bottom: 18px;
}

.letter-title {
  font-family: var(--serif);
  font-size: 42px;
  font-weight: 600;
  text-align: center;
  margin: 0 0 8px;
  color: var(--ink);
  letter-spacing: 0.06em;
}

.letter-sub {
  text-align: center;
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0 0 40px;
  line-height: 1.8;
}

.letter-divider {
  border: none;
  border-top: 1px solid var(--line);
  width: 64px;
  margin: 0 auto 40px;
}

.question-block {
  text-align: center;
}

.question-label {
  font-size: 13px;
  color: var(--ink-faint);
  margin-bottom: 10px;
}

.question-text {
  font-family: var(--serif);
  font-size: 22px;
  color: var(--ink);
  margin: 0 0 28px;
  line-height: 1.6;
}

.answer-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.answer-input {
  width: 100%;
  border: none;
  border-bottom: 1px solid var(--ink-faint);
  background: transparent;
  padding: 10px 4px;
  font-size: 17px;
  font-family: var(--sans);
  color: var(--ink);
  text-align: center;
  transition: border-color 0.25s ease;
}

.answer-input::placeholder {
  color: var(--ink-faint);
  opacity: 0.7;
}

.answer-input:focus {
  border-color: var(--rose);
}

.submit-btn {
  align-self: center;
  margin-top: 6px;
  padding: 11px 40px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.submit-btn:hover,
.submit-btn:focus-visible {
  background: var(--ink);
  color: var(--paper);
}

.submit-btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.form-msg {
  min-height: 20px;
  font-size: 13px;
  text-align: center;
  color: var(--rose-deep);
  transition: opacity 0.2s ease;
}

.form-msg.is-hidden {
  visibility: hidden;
}

/* 轻微的“错误抖动”，只在提交失败时触发一次 */
@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-6px);
  }
  40% {
    transform: translateX(5px);
  }
  60% {
    transform: translateX(-3px);
  }
  80% {
    transform: translateX(2px);
  }
}

.answer-form.shake {
  animation: shake 0.4s ease;
}

@media (prefers-reduced-motion: reduce) {
  .answer-form.shake {
    animation: none;
  }
}

/* ---------------- 相册页 ---------------- */

body.page-gallery {
  padding-bottom: 80px;
}

.gallery-header {
  text-align: center;
  padding: 64px 20px 40px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 48px;
  position: relative;
}

.gallery-eyebrow {
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
  margin-bottom: 14px;
}

.gallery-title {
  font-family: var(--serif);
  font-size: 36px;
  color: var(--ink);
  margin: 0;
  letter-spacing: 0.04em;
}

.gallery-back {
  display: inline-block;
  margin-top: 18px;
  font-size: 13px;
  color: var(--ink-faint);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.gallery-back:hover {
  color: var(--rose-deep);
  border-color: var(--rose-deep);
}

.gallery-grid {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 28px;
}

.frame {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 14px 14px 22px;
  box-shadow: 0 6px 18px var(--shadow);
  transform: rotate(var(--tilt, 0deg));
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.frame:hover {
  transform: rotate(0deg) translateY(-3px);
  box-shadow: 0 10px 24px var(--shadow);
}

.frame:nth-child(3n + 1) {
  --tilt: -0.6deg;
}

.frame:nth-child(3n + 2) {
  --tilt: 0.4deg;
}

.frame:nth-child(3n) {
  --tilt: -0.2deg;
}

.frame-media {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  background: var(--paper-deep);
}

.frame-caption {
  margin-top: 12px;
  text-align: center;
  font-family: var(--serif);
  font-size: 13px;
  color: var(--ink-faint);
}

.empty-state,
.loading-state,
.error-state {
  text-align: center;
  color: var(--ink-soft);
  font-size: 14px;
  padding: 60px 20px;
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.9;
}

@media (max-width: 480px) {
  .letter {
    padding: 40px 24px 36px;
  }

  .letter-title {
    font-size: 34px;
  }

  .gallery-title {
    font-size: 28px;
  }
}