:root {
  --bg: #f4f6f2;
  --surface: #ffffff;
  --ink: #24352d;
  --muted: #6d7c74;
  --line: #dde5df;
  --green: #2f6b4f;
  --green-dark: #24523d;
  --green-soft: #e6efe9;
  --coral: #df6b53;
  --coral-soft: #fbeae4;
  --amber: #d19a3b;
  --amber-soft: #f7eeda;
  --blue-soft: #e4eef2;
  --shadow: 0 1px 2px rgba(36, 53, 45, 0.05), 0 10px 30px rgba(36, 53, 45, 0.07);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.6;
  letter-spacing: 0;
}

button,
input,
textarea,
select {
  font: inherit;
  letter-spacing: 0;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius);
  background: var(--green);
  color: #fff;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text strong {
  font-size: 17px;
  font-weight: 700;
}

.brand-text small {
  color: var(--muted);
  font-size: 12px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav a {
  padding: 8px 14px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

.nav a:hover {
  background: var(--green-soft);
  color: var(--green-dark);
}

.nav a.active {
  background: var(--green);
  color: #fff;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 38px;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
}

.btn-primary {
  background: var(--green);
  color: #fff;
}

.btn-primary:hover {
  background: var(--green-dark);
}

.btn-ghost {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line);
}

.btn-ghost:hover {
  border-color: var(--green);
  color: var(--green);
}

.btn-compose {
  flex-shrink: 0;
}

.btn-logout {
  flex-shrink: 0;
}

.btn-block {
  width: 100%;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

.page {
  display: none;
}

.page.active {
  display: block;
}

.page-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: 30px;
  line-height: 1.25;
}

h2 {
  font-size: 18px;
  line-height: 1.3;
}

.pill {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  min-height: 28px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--green-soft);
  color: var(--green-dark);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.pill-private {
  background: var(--coral-soft);
  color: var(--coral);
}

.page-head-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.composer {
  padding: 18px;
  margin-bottom: 32px;
}

.composer-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.composer-top {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

input[type="text"],
input[type="date"],
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfcfa;
  color: var(--ink);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="text"],
input[type="date"],
select {
  height: 40px;
  padding: 0 12px;
}

textarea {
  resize: vertical;
  min-height: 96px;
  padding: 10px 12px;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(47, 107, 79, 0.12);
}

.composer-bottom {
  display: flex;
  align-items: center;
  gap: 12px;
}

.composer-spacer {
  flex: 1;
}

.file-hint {
  color: var(--muted);
  font-size: 13px;
  max-width: 260px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.visibility-trigger {
  max-width: 360px;
  min-width: 0;
}

.visibility-trigger span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.section-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.section-title span {
  color: var(--muted);
  font-size: 13px;
}

.timeline {
  position: relative;
  margin-left: 9px;
  padding-left: 26px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--line);
}

.timeline-item {
  position: relative;
  margin-bottom: 18px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px var(--green-soft);
}

.timeline-card {
  padding: 18px;
}

.timeline-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.avatar {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
}

.timeline-meta .who {
  font-weight: 700;
  font-size: 14px;
}

.timeline-meta .when {
  margin-left: auto;
  color: var(--muted);
  font-size: 13px;
}

.timeline-card h3 {
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.35;
}

.timeline-card p {
  margin: 0;
  color: #3f5248;
  white-space: pre-wrap;
}

.timeline-photo {
  margin-top: 12px;
  max-width: 560px;
  border-radius: 6px;
  overflow: hidden;
  cursor: zoom-in;
  background: #eef2ee;
}

.photo-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.timeline-photo img {
  width: 100%;
  height: auto;
  max-height: 420px;
  aspect-ratio: auto;
  object-fit: contain;
  background: #eef2ee;
}

.diary-list {
  display: grid;
  gap: 14px;
}

.diary-card {
  padding: 18px;
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 12px;
  align-items: start;
}

.diary-card .avatar {
  width: 40px;
  height: 40px;
  font-size: 15px;
}

.diary-body h3 {
  margin: 0 0 4px;
  font-size: 17px;
}

.diary-body p {
  margin: 0;
  color: #3f5248;
  white-space: pre-wrap;
}

.diary-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
}

.diary-photo {
  margin-top: 12px;
  max-width: 560px;
  border-radius: 6px;
  overflow: hidden;
  background: #eef2ee;
}

.diary-photo img {
  width: 100%;
  height: auto;
  max-height: 420px;
  aspect-ratio: auto;
  object-fit: contain;
  background: #eef2ee;
}

.visibility-summary {
  max-width: 260px;
  padding: 3px 8px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--green-soft);
  color: var(--green-dark);
  font-size: calc(12px * var(--font-scale));
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.visibility-summary:hover {
  border-color: var(--green);
}

.diary-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  max-width: 240px;
}

.diary-actions .visibility-summary {
  max-width: 220px;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--muted);
  transition: color 0.15s ease, border-color 0.15s ease;
}

.icon-btn:hover {
  color: var(--coral);
  border-color: var(--coral);
}

.album-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.photo-card {
  padding: 0;
  overflow: hidden;
  cursor: pointer;
}

.photo-card .photo-frame {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--green-soft);
}

.photo-card img {
  transition: transform 0.25s ease;
}

.photo-card:hover img {
  transform: scale(1.03);
}

.photo-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
}

.photo-meta strong {
  font-size: 14px;
  font-weight: 600;
}

.photo-meta span {
  margin-left: auto;
  color: var(--muted);
  font-size: 12px;
}

.photo-meta .icon-btn {
  width: 28px;
  height: 28px;
  margin-left: 6px;
}

.member-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.member-card {
  padding: 20px;
  text-align: center;
}

.member-card .avatar {
  width: 56px;
  height: 56px;
  margin: 0 auto 12px;
  font-size: 20px;
}

.member-card h3 {
  margin: 0 0 4px;
  font-size: 18px;
}

.member-card .role {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 13px;
}

.member-stats {
  display: flex;
  justify-content: center;
  gap: 8px;
}

.stat {
  min-width: 64px;
  padding: 6px 8px;
  border-radius: 6px;
  background: var(--green-soft);
  color: var(--green-dark);
  font-size: 12px;
}

.stat b {
  display: block;
  font-size: 15px;
  line-height: 1.2;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 32px;
  background: rgba(19, 29, 24, 0.88);
}

.lightbox[hidden] {
  display: none;
}

.lightbox img {
  max-width: min(920px, 100%);
  max-height: 76vh;
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

.lightbox p {
  margin: 14px 0 0;
  color: #fff;
  font-size: 14px;
}

.lightbox-close {
  position: absolute;
  top: 22px;
  right: 22px;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.25);
  color: #fff;
  font-size: 22px;
  line-height: 1;
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 22px 20px 34px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.empty-state {
  padding: 40px 20px;
  text-align: center;
  color: var(--muted);
}

.auth-backdrop,
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(20, 31, 26, 0.66);
  backdrop-filter: blur(8px);
}

.auth-backdrop[hidden],
.modal-backdrop[hidden] {
  display: none;
}

.auth-card {
  width: min(420px, 100%);
  padding: 28px;
}

.auth-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 18px;
}

.auth-brand .brand-mark {
  width: 42px;
  height: 42px;
}

.auth-form h2 {
  margin: 0 0 16px;
  text-align: center;
  font-size: 20px;
}

.field {
  display: block;
  margin-bottom: 12px;
}

.field > span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

.form-error {
  min-height: 20px;
  margin: 0 0 10px;
  color: var(--coral);
  font-size: 13px;
  text-align: center;
}

.auth-switch {
  display: block;
  margin: 14px auto 0;
  padding: 0;
  border: 0;
  background: none;
  color: var(--green);
  font-size: 13px;
  font-weight: 600;
}

.auth-switch:hover {
  color: var(--green-dark);
  text-decoration: underline;
}

.modal {
  width: min(420px, 100%);
  padding: 24px;
  text-align: center;
}

.modal h3 {
  margin: 0 0 8px;
}

.modal p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 14px;
}

.invite-code {
  margin-bottom: 18px;
  padding: 14px;
  border: 1px dashed var(--green);
  border-radius: var(--radius);
  background: var(--green-soft);
  color: var(--green-dark);
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

@media (max-width: 760px) {
  .topbar-inner {
    flex-wrap: wrap;
    padding: 10px 14px;
  }

  .brand-text small {
    display: none;
  }

  .nav {
    order: 3;
    width: 100%;
    margin: 2px 0 0;
    overflow-x: auto;
  }

  .nav a {
    flex-shrink: 0;
    padding: 8px 12px;
  }

  .btn-compose {
    min-height: 36px;
    padding: 0 12px;
    font-size: 13px;
  }

  main {
    padding: 24px 14px 48px;
  }

  .page-head {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .composer-top {
    grid-template-columns: 1fr;
  }

  .composer-bottom {
    flex-wrap: wrap;
  }

  .composer-spacer {
    display: none;
  }

  .timeline {
    margin-left: 6px;
    padding-left: 20px;
  }

  .timeline-item::before {
    left: -25px;
  }

  .timeline-photo img {
    max-height: 360px;
  }

  .diary-card {
    grid-template-columns: 38px 1fr;
  }

  .diary-card .icon-btn {
    grid-column: auto;
  }

  .diary-actions {
    grid-column: 1 / -1;
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
    max-width: none;
    width: 100%;
  }

  .album-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
  }

  .member-grid {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 10px;
  }

  .member-card {
    padding: 16px 12px;
  }

  .visibility-modes {
    grid-template-columns: 1fr;
  }

  .footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

:root {
  --font-scale: 1;
  --photo-max-width: 560px;
  --photo-max-height: 420px;
}

.settings-modal {
  width: min(520px, 100%);
  text-align: left;
}

.settings-group {
  margin-bottom: 16px;
}

.settings-group label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: calc(13px * var(--font-scale));
  font-weight: 600;
}

.settings-group input[type="range"] {
  width: 100%;
}

.settings-group > span {
  display: inline-block;
  margin-top: 4px;
  color: var(--muted);
  font-size: calc(12px * var(--font-scale));
}

.theme-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.theme-swatch {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-size: calc(13px * var(--font-scale));
}

.theme-swatch.active {
  border-color: var(--green);
  background: var(--green-soft);
  color: var(--green-dark);
}

.settings-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

.visibility-modal {
  width: min(580px, 100%);
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  text-align: left;
}

.visibility-modal-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.visibility-modal-head h3 {
  margin: 0 0 4px;
}

.visibility-modal-head p {
  margin: 0;
  color: var(--muted);
  font-size: calc(13px * var(--font-scale));
}

.visibility-modal-head .icon-btn {
  flex-shrink: 0;
}

.visibility-section {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.visibility-label {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: calc(14px * var(--font-scale));
  font-weight: 700;
}

.visibility-modes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.visibility-radio {
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 40px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-size: calc(13px * var(--font-scale));
}

.visibility-radio input,
.member-check input {
  margin: 0;
  accent-color: var(--green);
}

.member-check-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 8px;
  margin-top: 10px;
}

.member-check-list[hidden] {
  display: none;
}

.member-check {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfcfa;
  color: var(--ink);
  cursor: pointer;
  font-size: calc(13px * var(--font-scale));
}

.member-check .avatar {
  width: 26px;
  height: 26px;
  font-size: 11px;
}

.member-check > span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.member-check input:disabled {
  cursor: not-allowed;
}

.visibility-error {
  margin: 14px 0 0;
  text-align: left;
}

.visibility-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

.comments {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.comment-list {
  display: grid;
  gap: 8px;
  margin-bottom: 10px;
}

.comment {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: calc(13px * var(--font-scale));
}

.comment .avatar {
  width: 24px;
  height: 24px;
  font-size: 10px;
}

.comment-body {
  flex: 1;
  min-width: 0;
}

.comment-body strong {
  margin-right: 6px;
}

.comment-time {
  color: var(--muted);
  font-size: calc(11px * var(--font-scale));
}

.comment-body p {
  margin: 2px 0 0;
  color: var(--ink);
  word-break: break-word;
}

.comment-empty {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: calc(12px * var(--font-scale));
}

.comment-delete {
  border: 0;
  background: none;
  color: var(--muted);
  cursor: pointer;
  font-size: calc(12px * var(--font-scale));
}

.comment-form {
  display: flex;
  gap: 8px;
}

.comment-form input {
  flex: 1;
  min-width: 0;
  height: 34px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  font-size: calc(13px * var(--font-scale));
}

body {
  font-size: calc(16px * var(--font-scale));
}

h1 {
  font-size: calc(30px * var(--font-scale));
}

h2 {
  font-size: calc(18px * var(--font-scale));
}

.brand-text strong {
  font-size: calc(17px * var(--font-scale));
}

.timeline-card h3,
.diary-body h3,
.member-card h3,
.modal h3 {
  font-size: calc(17px * var(--font-scale));
}

.timeline-card p,
.diary-body p {
  font-size: calc(16px * var(--font-scale));
}

.brand-text small,
.eyebrow,
.nav a,
.btn,
.pill,
.timeline-meta,
.diary-meta,
.photo-meta,
.member-card .role,
.footer,
.field > span,
.form-error,
.auth-switch,
.modal p {
  font-size: calc(13px * var(--font-scale));
}

.timeline-photo,
.diary-photo {
  max-width: var(--photo-max-width);
  background: #eef2ee;
}

.timeline-photo img,
.diary-photo img {
  width: 100%;
  height: auto;
  max-height: var(--photo-max-height);
  aspect-ratio: auto;
  object-fit: contain;
  background: #eef2ee;
}

@media (max-width: 760px) {
  .timeline-photo img,
  .diary-photo img {
    max-height: 360px;
  }
}

[data-theme="warm"] {
  --bg: #fbf7f3;
  --surface: #ffffff;
  --ink: #3c2f2a;
  --muted: #7d6b61;
  --line: #eaded5;
  --green: #a6533b;
  --green-dark: #843d2c;
  --green-soft: #f6e4dc;
  --coral: #d97757;
  --coral-soft: #fbe8df;
  --amber: #c98938;
  --amber-soft: #f7ecd9;
  --blue-soft: #e8eff0;
}

[data-theme="ocean"] {
  --bg: #f2f7f7;
  --surface: #ffffff;
  --ink: #23383d;
  --muted: #647b80;
  --line: #d7e4e4;
  --green: #2b6f78;
  --green-dark: #1f555c;
  --green-soft: #dceced;
  --coral: #d96b57;
  --coral-soft: #f8e5df;
  --amber: #c6923c;
  --amber-soft: #f4ead8;
  --blue-soft: #e0edf1;
}

[data-theme="plum"] {
  --bg: #f8f5f8;
  --surface: #ffffff;
  --ink: #382d3b;
  --muted: #7a6b7c;
  --line: #e4dbe6;
  --green: #76507f;
  --green-dark: #5d3d66;
  --green-soft: #ede3f0;
  --coral: #c66b75;
  --coral-soft: #f7e4e7;
  --amber: #b98a4a;
  --amber-soft: #f2e8d8;
  --blue-soft: #e8e9f2;
}