:root {
  --ink: #172035;
  --muted: #67705f;
  --paper: #f5f0e4;
  --paper-deep: #e7ddc8;
  --olive: #59603a;
  --olive-dark: #303722;
  --line: rgba(51, 55, 36, .18);
  --accent: #b49a55;
  --navy: #0f2138;
  --navy-2: #142b46;
  --white: #fffaf0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "Microsoft YaHei", serif;
  background:
    radial-gradient(circle at 18% 10%, rgba(180, 154, 85, .16), transparent 28%),
    linear-gradient(135deg, #0d1829 0%, #18263a 44%, #343821 100%);
}

button {
  font: inherit;
}

.app-shell {
  display: block;
  width: min(920px, calc(100vw - 36px));
  margin: 0 auto;
  padding: 22px 0;
}

.crest {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  object-fit: contain;
  filter: brightness(0) saturate(100%) invert(31%) sepia(15%) saturate(744%) hue-rotate(28deg) brightness(91%) contrast(86%) drop-shadow(0 2px 1px rgba(0, 0, 0, .08));
}

.kicker {
  margin: 0 0 2px;
  color: var(--olive);
  font-size: 12px;
  letter-spacing: 2.4px;
  text-transform: uppercase;
}

.preview-stage {
  display: grid;
  place-items: start center;
  min-width: 0;
  padding: 4px 0 32px;
}

.preview-card {
  width: min(800px, 100%);
  overflow: hidden;
  background: var(--paper);
  box-shadow: 0 28px 80px rgba(0, 0, 0, .38);
  border: 1px solid rgba(255, 250, 240, .32);
}

.letter-head {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 22px 34px;
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(15, 33, 56, .99), rgba(20, 43, 70, .97)),
    linear-gradient(180deg, transparent, rgba(255, 255, 255, .08));
  border-bottom: 4px solid var(--accent);
}

.letter-head::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 62%;
  height: 100%;
  opacity: .78;
  background: url("assets/castle-silhouette.svg") right bottom / contain no-repeat;
  pointer-events: none;
}

.letter-head > * {
  position: relative;
  z-index: 1;
}

.letter-head .crest {
  width: 74px;
  height: 74px;
  filter: drop-shadow(0 2px 2px rgba(0, 0, 0, .22));
}

.letter-head p,
.mail-top p {
  margin: 0;
  font-family: Georgia, serif;
  font-size: 30px;
  letter-spacing: 2.6px;
  text-transform: uppercase;
}

.letter-head span,
.mail-top span {
  display: block;
  margin-top: 3px;
  color: rgba(255, 250, 240, .74);
  font-size: 13px;
}

.letter-body {
  position: relative;
  padding: 42px 50px 38px;
  background:
    linear-gradient(90deg, rgba(89, 96, 58, .025) 1px, transparent 1px),
    linear-gradient(#f8f2e6, #f1e8d7);
  background-size: 42px 100%, 100% 100%;
}

.watermark {
  position: absolute;
  top: 30px;
  right: 38px;
  width: 148px;
  height: 148px;
  opacity: .16;
  filter: brightness(0) saturate(100%) invert(31%) sepia(15%) saturate(744%) hue-rotate(28deg) brightness(91%) contrast(86%);
  pointer-events: none;
}

h2 {
  margin: 0 0 24px;
  color: var(--navy);
  font-size: clamp(30px, 4vw, 48px);
  letter-spacing: 0;
}

.meta-grid {
  display: grid;
  grid-template-columns: 82px 1fr;
  gap: 10px 12px;
  margin: 0;
  font-size: 17px;
}

.meta-grid dt {
  font-weight: 700;
}

.meta-grid dd {
  margin: 0;
}

.divider {
  height: 1px;
  margin: 24px 0;
  background: var(--line);
}

.notice-copy {
  display: grid;
  gap: 13px;
  font-size: 18px;
  line-height: 1.92;
}

.notice-copy p {
  margin: 0;
}

.storm-map {
  position: relative;
  aspect-ratio: 1040 / 592;
  height: auto;
  margin: 30px 0 24px;
  overflow: hidden;
  border: 1px solid rgba(16, 32, 53, .26);
  border-radius: 7px;
  background: #102035;
}

.storm-map::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(16,32,53,.02), rgba(16,32,53,.06));
  pointer-events: none;
}

.storm-map img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: contrast(1.04) brightness(.98);
}

.storm-label {
  position: absolute;
  z-index: 2;
  left: 18px;
  top: 18px;
  display: grid;
  gap: 5px;
  padding: 10px 12px;
  color: var(--white);
  background: rgba(16, 32, 53, .78);
  border: 1px solid rgba(255,255,255,.26);
  text-transform: uppercase;
}

.storm-label span {
  font-size: 12px;
}

.storm-label b {
  font-size: 13px;
}

.storm-map figcaption {
  position: absolute;
  z-index: 2;
  right: 12px;
  bottom: 10px;
  color: rgba(255, 250, 240, .72);
  font-size: 11px;
  letter-spacing: .5px;
  text-transform: uppercase;
}

.signature-image {
  display: block;
  width: 190px;
  height: auto;
  margin: 8px 0 0 auto;
  mix-blend-mode: multiply;
  filter: contrast(1.08) saturate(.85);
}

.signature-role {
  margin: 0;
  text-align: right;
  color: var(--navy);
  font-size: 14px;
  letter-spacing: 1px;
}

.mail-view {
  background: #f7f2e7;
}

.login-view {
  background: #f7f2e7;
}

.login-body {
  position: relative;
  min-height: 620px;
  padding: 64px 58px;
  background:
    linear-gradient(120deg, rgba(251,246,236,.98), rgba(238,229,211,.94)),
    radial-gradient(circle at 76% 18%, rgba(89,96,58,.12), transparent 26%);
}

.login-body::after {
  content: "";
  position: absolute;
  right: 36px;
  bottom: 28px;
  width: 180px;
  height: 180px;
  opacity: .08;
  background: url("assets/cassell-crest.svg") center / contain no-repeat;
  filter: brightness(0) saturate(100%) invert(31%) sepia(15%) saturate(744%) hue-rotate(28deg) brightness(91%) contrast(86%);
  pointer-events: none;
}

.system-label {
  margin: 0 0 14px;
  color: var(--olive);
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.login-copy {
  max-width: 560px;
  margin: 0 0 28px;
  color: var(--olive-dark);
  font-size: 19px;
  line-height: 1.9;
}

.login-meta {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 12px 16px;
  width: min(100%, 520px);
  margin: 0 0 34px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.login-meta dt {
  color: var(--muted);
}

.login-meta dd {
  margin: 0;
  color: var(--ink);
  font-weight: 700;
}

.mail-top {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 22px 32px;
  color: var(--olive);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(255,250,240,.96), rgba(243,236,220,.9)),
    radial-gradient(circle at 78% 45%, rgba(89,96,58,.09), transparent 24%),
    repeating-linear-gradient(90deg, transparent 0 44px, rgba(89,96,58,.06) 45px 46px);
}

.mail-top::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 52%;
  height: 100%;
  opacity: .18;
  background: url("assets/castle-silhouette.svg") right bottom / contain no-repeat;
  pointer-events: none;
}

.mail-top > * {
  position: relative;
  z-index: 1;
}

.mail-top .small {
  width: 48px;
  height: 48px;
}

.mail-top span {
  color: var(--olive);
}

.mail-layout {
  display: grid;
  grid-template-columns: 218px 1fr;
}

.mail-sidebar {
  min-height: 780px;
  border-right: 1px solid var(--line);
  background: rgba(232, 223, 204, .42);
}

.mail-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 54px;
  border: 0;
  padding: 0 22px;
  color: var(--olive);
  background: transparent;
  border-bottom: 1px solid rgba(89, 96, 58, .09);
  font-size: 18px;
  cursor: pointer;
  text-align: left;
}

.mail-nav:hover {
  background: rgba(255, 250, 240, .42);
}

.mail-nav.active {
  color: var(--white);
  background: var(--olive);
}

.mail-nav span {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent);
  font-size: 13px;
}

.contact-list {
  display: grid;
  gap: 22px;
  padding: 30px 26px;
  color: var(--olive-dark);
  font-size: 18px;
}

.contact-list p {
  margin: 0;
}

.contact-list .online::before {
  content: "";
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 10px;
  border-radius: 50%;
  background: var(--olive);
}

.mail-list {
  display: grid;
  gap: 0;
  padding: 12px;
}

.mail-item {
  display: grid;
  gap: 5px;
  width: 100%;
  border: 1px solid transparent;
  border-bottom-color: rgba(89, 96, 58, .12);
  border-radius: 6px;
  padding: 12px 10px;
  color: var(--olive-dark);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.mail-item:hover {
  background: rgba(255, 250, 240, .56);
}

.mail-item.active {
  border-color: rgba(89, 96, 58, .28);
  background: rgba(255, 250, 240, .78);
  box-shadow: inset 3px 0 0 var(--olive);
}

.mail-item-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 14px;
}

.mail-item-top time {
  color: var(--muted);
  font-size: 12px;
}

.mail-subject {
  overflow: hidden;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mail-preview {
  display: -webkit-box;
  overflow: hidden;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.folder-empty {
  margin: 18px 10px;
  padding: 18px 10px;
  color: var(--muted);
  border: 1px dashed rgba(89, 96, 58, .24);
  border-radius: 6px;
  text-align: center;
}

.mail-content {
  position: relative;
  padding: 46px 46px 38px;
  background: linear-gradient(#fbf6ec, #f3ead9);
}

.mail-content h2 {
  font-size: 34px;
}

.mail-author {
  display: grid;
  gap: 6px;
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 16px;
}

.mail-author b {
  color: var(--olive-dark);
  font-size: 20px;
}

.mail-author i {
  font-style: normal;
}

.mail-summary {
  display: grid;
  gap: 12px;
  margin: 0 0 24px;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.9;
}

.mail-summary p {
  margin: 0;
}

.mail-actions {
  display: grid;
  gap: 12px;
  margin: 20px 0 8px;
}

.primary-link,
.attachment-link {
  justify-self: start;
  min-height: 42px;
  border-radius: 6px;
  padding: 0 18px;
  cursor: pointer;
}

.primary-link {
  border: 1px solid var(--olive);
  color: var(--white);
  background: var(--olive);
}

.attachment-link {
  border: 1px solid rgba(89, 96, 58, .28);
  color: var(--olive-dark);
  background: rgba(255, 250, 240, .72);
}

.download-hint {
  min-height: 24px;
  margin: 14px 0 0;
  color: #8b3d2e;
  font-size: 14px;
}

.storm-map.compact {
  aspect-ratio: 1040 / 592;
  height: auto;
}

.mail-sign {
  margin: 18px 0 0;
  font-size: 19px;
}

.mail-signature {
  display: flex;
  align-items: end;
  justify-content: flex-start;
  gap: 10px;
  margin-top: 20px;
  color: var(--olive-dark);
  font-size: 18px;
}

.mail-signature img {
  width: 132px;
  height: auto;
  mix-blend-mode: multiply;
  filter: contrast(1.08) saturate(.85);
}

.hidden {
  display: none;
}

@media (max-width: 980px) {
  .app-shell {
    width: min(100% - 20px, 720px);
  }
}

@media (max-width: 680px) {
  .app-shell {
    width: 100%;
    padding: 0;
  }

  .preview-stage {
    padding: 0;
  }

  .preview-card {
    width: 100%;
    min-height: 100vh;
    border: 0;
    box-shadow: none;
  }

  .letter-body,
  .mail-content {
    padding: 26px 18px 30px;
  }

  .letter-head,
  .mail-top {
    min-height: 82px;
    padding: 14px 16px;
    gap: 10px;
  }

  .letter-head p,
  .mail-top p {
    font-size: clamp(18px, 6vw, 22px);
    letter-spacing: 1.2px;
    line-height: 1.1;
    overflow-wrap: anywhere;
  }

  .letter-head span,
  .mail-top span {
    font-size: 12px;
  }

  .letter-head .crest,
  .mail-top .small {
    width: 48px;
    height: 48px;
    flex: 0 0 auto;
  }

  .letter-head::after {
    width: 76%;
    opacity: .42;
  }

  .mail-top::after {
    width: 70%;
    opacity: .1;
  }

  h2 {
    margin-bottom: 18px;
    font-size: clamp(26px, 9vw, 34px);
  }

  .login-body {
    min-height: calc(100vh - 82px);
    padding: 42px 20px 34px;
  }

  .login-body::after {
    right: 16px;
    bottom: 18px;
    width: 130px;
    height: 130px;
  }

  .login-copy {
    font-size: 17px;
    line-height: 1.8;
  }

  .login-meta {
    grid-template-columns: 76px 1fr;
    gap: 10px 12px;
    font-size: 15px;
  }

  .mail-layout {
    grid-template-columns: 1fr;
  }

  .mail-sidebar {
    display: block;
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .mail-nav {
    min-height: 42px;
    padding: 0 12px;
    font-size: 15px;
  }

  .mail-nav span {
    width: 20px;
    height: 20px;
    font-size: 12px;
  }

  .mail-sidebar {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .mail-list {
    grid-column: 1 / -1;
    max-height: 44vh;
    overflow: auto;
    padding: 8px;
  }

  .mail-list {
    grid-template-columns: 1fr;
  }

  .mail-item {
    padding: 10px;
  }

  .mail-content h2 {
    font-size: clamp(24px, 8vw, 30px);
    overflow-wrap: anywhere;
  }

  .mail-author,
  .mail-summary {
    font-size: 16px;
    line-height: 1.75;
  }

  .mail-actions {
    gap: 10px;
  }

  .primary-link,
  .attachment-link {
    justify-self: stretch;
    width: 100%;
    min-height: 44px;
    padding: 0 12px;
    text-align: center;
  }

  .attachment-link {
    font-size: 14px;
    overflow-wrap: anywhere;
  }

  .meta-grid {
    grid-template-columns: 72px 1fr;
    font-size: 15px;
  }

  .watermark {
    top: 24px;
    right: 14px;
    width: 118px;
    height: 118px;
    opacity: .12;
  }

  .storm-map {
    aspect-ratio: 1040 / 592;
    height: auto;
    margin: 22px 0 18px;
  }

  .notice-copy {
    font-size: 16px;
    line-height: 1.82;
  }

  .signature-image {
    width: 150px;
  }

  .signature-role {
    font-size: 12px;
    letter-spacing: 0;
  }

  .mail-signature {
    font-size: 16px;
  }

  .mail-signature img {
    width: 110px;
  }
}

@media print {
  body {
    background: white;
  }

  .app-shell {
    display: block;
    width: 100%;
    padding: 0;
  }

  .preview-card {
    width: 100%;
    box-shadow: none;
  }

  .preview-card.hidden {
    display: none;
  }
}