/* ===================== CHỦ ĐỀ MÀU ===================== */
:root {
  /* Mặc định: Giấy ấm (cream) */
  --desk: #c9bfae; --cover: #5b4636; --cover-text: #f3e9d9;
  --paper: #fffdf7; --field-bg: #ffffff;
  --rule: #c9d6ea; --margin-line: #e3a9a9;
  --ink: #33291f; --ink-soft: #8a7d6a;
  --accent: #b07b3e; --accent-dark: #946530;
  --sidebar: #efe8da; --border: #ded2bd; --danger: #b14a3c;
  --shadow: 0 10px 30px rgba(60, 44, 26, 0.18);
  --radius: 14px; --line-h: 34px;
  /* phông & cỡ chữ viết (tùy biến) */
  --write-font: "Lora", serif; --write-size: 18px;
}
:root[data-theme="sage"] {
  --desk: #c6ccbd; --cover: #4d5944; --cover-text: #eef2e6;
  --paper: #fbfdf6; --field-bg: #ffffff;
  --rule: #d4e0cf; --margin-line: #b9c79e;
  --ink: #2f342a; --ink-soft: #76806a;
  --accent: #7c8c58; --accent-dark: #65754; --accent-dark: #647445;
  --sidebar: #e9efe0; --border: #d3dac6;
  --shadow: 0 10px 30px rgba(50, 60, 40, 0.16);
}
:root[data-theme="sunset"] {
  --desk: #d9c4bd; --cover: #6e4a52; --cover-text: #fbeee6;
  --paper: #fff7f1; --field-bg: #fffaf6;
  --rule: #f0d9cf; --margin-line: #e8b39d;
  --ink: #4a3530; --ink-soft: #9a7d72;
  --accent: #cf8763; --accent-dark: #b06b49;
  --sidebar: #f6e6dd; --border: #eed6cb;
  --shadow: 0 10px 30px rgba(110, 74, 60, 0.18);
}
:root[data-theme="sakura"] {
  --desk: #e3cdd4; --cover: #7d5460; --cover-text: #fcebf1;
  --paper: #fff8fb; --field-bg: #fffafc;
  --rule: #f3dde6; --margin-line: #e6b3c6;
  --ink: #4a333b; --ink-soft: #9c7c87;
  --accent: #d67a9a; --accent-dark: #bd6182;
  --sidebar: #fae9f0; --border: #f0d8e2;
  --shadow: 0 10px 30px rgba(125, 84, 96, 0.16);
}
:root[data-theme="ocean"] {
  --desk: #bac8cd; --cover: #3f5560; --cover-text: #e9f3f6;
  --paper: #f7fbfc; --field-bg: #fbfeff;
  --rule: #d2e4ea; --margin-line: #a9cdd8;
  --ink: #29383d; --ink-soft: #6d8389;
  --accent: #5b94a6; --accent-dark: #43798b;
  --sidebar: #e3eef1; --border: #cfdfe4;
  --shadow: 0 10px 30px rgba(40, 70, 80, 0.16);
}
:root[data-theme="night"] {
  --desk: #2b2a33; --cover: #1f1e26; --cover-text: #e9e3d7;
  --paper: #33323d; --field-bg: #3b3a46;
  --rule: #46444f; --margin-line: #7a6a8c;
  --ink: #ece6da; --ink-soft: #a89fb0;
  --accent: #cba66a; --accent-dark: #b48f54;
  --sidebar: #28272f; --border: #403e4a;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

/* ===================== PHÔNG & CỠ CHỮ VIẾT ===================== */
:root[data-font="serif"] { --write-font: "Lora", serif; }
:root[data-font="sans"]  { --write-font: "Quicksand", system-ui, sans-serif; }
:root[data-font="hand"]  { --write-font: "Caveat", "Lora", cursive; }
:root[data-size="sm"] { --write-size: 16px; }
:root[data-size="md"] { --write-size: 18px; }
:root[data-size="lg"] { --write-size: 21px; }
:root[data-font="hand"][data-size="sm"] { --write-size: 20px; }
:root[data-font="hand"][data-size="md"] { --write-size: 23px; }
:root[data-font="hand"][data-size="lg"] { --write-size: 27px; }

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Nunito", system-ui, sans-serif;
  color: var(--ink);
  background-color: var(--desk);
  min-height: 100vh;
  transition: background-color .5s ease, color .4s ease;
}

/* ===================== KHÔNG KHÍ NỀN ===================== */
body[data-bg="plain"] { background-image: none; }
body[data-bg="gradient"] {
  background-image:
    radial-gradient(circle at 20% 10%, rgba(255,255,255,0.18), transparent 45%),
    radial-gradient(circle at 80% 90%, rgba(70,50,30,0.12), transparent 50%);
}
body[data-bg="aurora"] {
  background-image:
    radial-gradient(42% 52% at 18% 28%, rgba(255,255,255,0.28), transparent 60%),
    radial-gradient(46% 56% at 82% 72%, rgba(120,90,60,0.16), transparent 60%),
    radial-gradient(52% 60% at 62% 18%, rgba(176,123,62,0.16), transparent 60%);
  background-size: 200% 200%, 200% 200%, 200% 200%;
  animation: aurora 34s ease-in-out infinite alternate;
}
@keyframes aurora {
  from { background-position: 0% 0%, 100% 100%, 50% 0%; }
  to   { background-position: 100% 50%, 0% 50%, 40% 100%; }
}
@media (prefers-reduced-motion: reduce) { body[data-bg="aurora"] { animation: none; } }

.screen { min-height: 100vh; }
.hidden { display: none !important; }

/* dịu dàng: hiện ra mềm mại */
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.screen:not(.hidden) { animation: fadeUp .5s ease both; }

/* ===================== Đăng nhập ===================== */
.brand-mark {
  display: inline-grid; place-items: center;
  width: 60px; height: 60px; border-radius: 50%;
  background: var(--cover); color: var(--cover-text);
  font-size: 28px; box-shadow: var(--shadow);
}
.auth-screen { display: grid; place-items: center; padding: 24px; }
.auth-card {
  width: 100%; max-width: 400px;
  background: var(--paper); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 38px 30px;
}
.brand { text-align: center; margin-bottom: 26px; }
.brand h1 { font-family: "Playfair Display", serif; font-size: 28px; margin: 14px 0 6px; font-weight: 600; }
.brand-sub { margin: 0; color: var(--ink-soft); font-size: 14px; font-style: italic; font-family: "Lora", serif; }

.auth-form { display: flex; flex-direction: column; gap: 16px; }
.auth-form label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; font-weight: 700; color: var(--ink-soft); }
input, textarea {
  font-family: inherit; font-size: 16px; color: var(--ink);
  background: var(--field-bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 11px 13px; outline: none; transition: border-color .15s, box-shadow .15s;
}
input:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(176,123,62,0.16); }
.auth-actions { display: flex; gap: 10px; margin-top: 4px; }
.auth-actions .btn { flex: 1; }
.auth-note { margin: 6px 0 0; text-align: center; font-size: 12px; color: var(--ink-soft); }

/* ===================== Nút ===================== */
.btn {
  font-family: inherit; font-size: 15px; font-weight: 700;
  padding: 11px 18px; border-radius: 999px; border: 1px solid transparent; cursor: pointer;
  transition: transform .06s, background .2s, color .2s, border-color .2s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { background: transparent; color: var(--cover-text); border-color: rgba(243,233,217,0.4); }
.btn-ghost:hover { background: rgba(243,233,217,0.14); }
.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn:disabled { opacity: .55; cursor: default; }

.msg { min-height: 18px; margin: 4px 0 0; font-size: 13px; text-align: center; }
.msg.error { color: var(--danger); }
.msg.ok { color: var(--accent-dark); }

/* ===================== Thanh trên cùng ===================== */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 13px 22px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--cover) 88%, #fff 12%), var(--cover));
  color: var(--cover-text);
  border-bottom: 3px solid rgba(0,0,0,0.25);
  box-shadow: 0 2px 10px rgba(0,0,0,0.2);
  position: sticky; top: 0; z-index: 5;
  transition: background .5s ease;
}
.topbar-brand { display: flex; align-items: center; gap: 10px; min-width: 0; flex: 1; }
.book-icon { font-size: 20px; flex-shrink: 0; }
.topbar-title { font-family: "Playfair Display", serif; font-weight: 600; font-size: 19px; letter-spacing: .3px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Menu tài khoản (gom Tùy chỉnh / Đổi mật khẩu / Đăng xuất) */
.topbar-user { position: relative; flex-shrink: 0; }
.menu-btn {
  display: inline-flex; align-items: center; gap: 7px;
  background: rgba(243,233,217,0.12); border: 1px solid rgba(243,233,217,0.30);
  color: var(--cover-text); padding: 4px 11px 4px 4px; border-radius: 999px;
  cursor: pointer; transition: background .15s;
}
.menu-btn:hover { background: rgba(243,233,217,0.22); }
.menu-avatar {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent); color: #fff;
  display: grid; place-items: center; font-weight: 700; font-size: 13px;
  font-family: "Nunito", sans-serif;
}
.menu-caret { font-size: 11px; opacity: .85; }

.user-menu {
  position: absolute; top: calc(100% + 10px); right: 0; min-width: 210px;
  background: var(--paper); border: 1px solid var(--border);
  border-radius: 14px; box-shadow: var(--shadow); padding: 7px; z-index: 30;
  animation: fadeUp .18s ease both;
}
.user-menu-head {
  padding: 8px 12px 10px; font-size: 13px; font-weight: 700; color: var(--ink-soft);
  border-bottom: 1px solid var(--border); margin-bottom: 5px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.menu-item {
  display: block; width: 100%; text-align: left;
  background: transparent; border: none; color: var(--ink);
  font-family: "Nunito", sans-serif; font-size: 14px; font-weight: 600;
  padding: 10px 12px; border-radius: 9px; cursor: pointer; transition: background .12s;
}
.menu-item:hover { background: color-mix(in srgb, var(--accent) 14%, transparent); }
.menu-item.danger { color: var(--danger); }
.menu-item.danger:hover { background: color-mix(in srgb, var(--danger) 12%, transparent); }

/* ===================== Bàn làm việc ===================== */
.workspace { display: flex; align-items: flex-start; gap: 26px; max-width: 1040px; margin: 0 auto; padding: 28px 22px 80px; }
.sidebar {
  width: 270px; flex-shrink: 0;
  background: var(--sidebar); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px;
  position: sticky; top: 86px; max-height: calc(100vh - 120px);
  display: flex; flex-direction: column; transition: background .5s ease;
}
.new-entry-btn { width: 100%; margin-bottom: 14px; }
.entries-list { display: flex; flex-direction: column; gap: 4px; overflow-y: auto; }
.entry-item {
  padding: 11px 12px; border-radius: 10px; cursor: pointer;
  border-left: 3px solid transparent; transition: background .15s;
}
.entry-item:hover { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.entry-item.active { background: var(--field-bg); border-left-color: var(--accent); box-shadow: 0 1px 4px rgba(0,0,0,0.08); }
.ei-date { font-size: 11px; font-weight: 700; color: var(--ink-soft); text-transform: uppercase; letter-spacing: .4px; }
.ei-title { font-family: "Playfair Display", serif; font-size: 15px; color: var(--ink); margin: 2px 0; line-height: 1.25; }
.ei-snippet { font-size: 12.5px; color: var(--ink-soft); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ei-author { display: inline-block; margin-top: 4px; background: var(--accent); color: #fff; font-size: 10px; font-weight: 700; padding: 1px 7px; border-radius: 999px; }
.empty { text-align: center; color: var(--ink-soft); padding: 24px 8px; font-family: "Lora", serif; line-height: 1.6; }

/* ===================== Trang giấy ===================== */
.page-area { flex: 1; min-width: 0; }
.sheet-empty {
  background: var(--paper); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 80px 30px; text-align: center;
  font-family: "Lora", serif; font-style: italic; color: var(--ink-soft); font-size: 17px;
}
.paper-sheet {
  background: var(--paper); border: 1px solid var(--border); border-radius: 4px;
  box-shadow: var(--shadow); padding: 34px 40px 28px; position: relative;
  transition: background .5s ease;
}
.paper-sheet::before {
  content: ""; position: absolute; top: 0; right: 0; bottom: 0; width: 6px;
  background: linear-gradient(90deg, rgba(0,0,0,0.04), transparent);
  border-top-right-radius: 4px; border-bottom-right-radius: 4px;
}
.sheet-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.sheet-date { font-family: "Playfair Display", serif; font-style: italic; font-size: 19px; color: var(--accent-dark); }
.sheet-author { font-size: 12px; font-weight: 700; color: #fff; background: var(--accent); padding: 2px 10px; border-radius: 999px; }

.sheet-title {
  font-family: "Playfair Display", serif; font-size: 27px; font-weight: 600; color: var(--ink);
  border: none; background: transparent; padding: 8px 0 4px; width: 100%; border-radius: 0;
}
.sheet-title::placeholder { color: var(--ink-soft); opacity: .6; font-style: italic; }
.sheet-title:focus { box-shadow: none; }

/* Gợi ý viết */
.prompt-bar {
  display: flex; align-items: center; gap: 10px; margin: 6px 0 4px;
  background: color-mix(in srgb, var(--accent) 10%, var(--paper));
  border: 1px dashed var(--accent); border-radius: 12px; padding: 9px 12px;
}
.prompt-text { flex: 1; font-family: "Lora", serif; font-style: italic; color: var(--ink); font-size: 14.5px; cursor: pointer; }
.prompt-shuffle { border: none; background: transparent; cursor: pointer; font-size: 16px; color: var(--accent-dark); padding: 2px 6px; border-radius: 8px; }
.prompt-shuffle:hover { background: color-mix(in srgb, var(--accent) 18%, transparent); }

.mood-picker { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 14px; }
.mood-chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 11px;
  border: 1px solid var(--border); background: var(--field-bg); border-radius: 999px;
  cursor: pointer; font-size: 13.5px; color: var(--ink-soft); transition: all .12s;
  font-family: "Nunito", sans-serif;
}
.mood-chip .emoji { font-size: 16px; }
.mood-chip:hover { border-color: var(--accent); }
.mood-chip.active { background: color-mix(in srgb, var(--accent) 20%, var(--paper)); border-color: var(--accent); color: var(--ink); font-weight: 700; }
.mood-picker.readonly .mood-chip { cursor: default; }

/* Vùng viết + các kiểu giấy */
.sheet-body {
  width: 100%; min-height: 320px; resize: none; overflow: hidden;
  font-family: var(--write-font); font-size: var(--write-size); line-height: var(--line-h);
  color: var(--ink); border: none; border-radius: 0; padding: 0 0 0 16px;
  background-color: transparent; background-attachment: local;
}
.sheet-body:focus { box-shadow: none; }
.sheet-body::placeholder { color: var(--ink-soft); opacity: .6; font-style: italic; }
.sheet-body[data-paper="lined"] {
  padding-left: 58px;
  background-image:
    linear-gradient(to right, transparent 46px, var(--margin-line) 46px, var(--margin-line) 48px, transparent 48px),
    repeating-linear-gradient(to bottom, transparent 0, transparent calc(var(--line-h) - 1px), var(--rule) calc(var(--line-h) - 1px), var(--rule) var(--line-h));
}
.sheet-body[data-paper="dotted"] {
  background-image: radial-gradient(var(--rule) 1.5px, transparent 1.6px);
  background-size: 24px var(--line-h); background-position: 8px 12px;
}
.sheet-body[data-paper="blank"] { background-image: none; }

.sheet-actions { display: flex; align-items: center; justify-content: flex-end; gap: 14px; margin-top: 18px; }
.hint { font-size: 13px; color: var(--ink-soft); margin-right: auto; }

/* ===================== Hộp thoại / panel ===================== */
.modal-overlay { position: fixed; inset: 0; background: rgba(30,22,14,0.45); display: grid; place-items: center; z-index: 20; padding: 20px; animation: fadeUp .25s ease both; }
.modal { background: var(--paper); border-radius: var(--radius); box-shadow: var(--shadow); padding: 26px 26px 22px; width: 100%; max-width: 360px; }
.modal h3 { font-family: "Playfair Display", serif; margin: 0 0 16px; font-size: 21px; color: var(--ink); }
.modal label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; font-weight: 700; color: var(--ink-soft); margin-bottom: 12px; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 6px; }

/* Panel tùy chỉnh */
.settings-modal { max-width: 440px; }
.settings-modal .modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; }
.settings-modal h3 { margin: 0; }
.settings-sub { color: var(--ink-soft); font-size: 13px; font-family: "Lora", serif; font-style: italic; margin: 0 0 16px; }
.set-section { margin-bottom: 18px; }
.set-section > .set-label { display: block; font-size: 12px; font-weight: 700; color: var(--ink-soft); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 8px; }
.opt-row { display: flex; flex-wrap: wrap; gap: 8px; }
.opt {
  padding: 8px 14px; border: 1.5px solid var(--border); border-radius: 999px;
  background: var(--field-bg); color: var(--ink); cursor: pointer; font-size: 13.5px;
  font-family: "Nunito", sans-serif; transition: all .15s; display: inline-flex; align-items: center; gap: 7px;
}
.opt:hover { border-color: var(--accent); }
.opt.active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 16%, var(--paper)); font-weight: 700; }
.opt[data-group="font"][data-value="serif"] { font-family: "Lora", serif; }
.opt[data-group="font"][data-value="sans"] { font-family: "Quicksand", sans-serif; }
.opt[data-group="font"][data-value="hand"] { font-family: "Caveat", cursive; font-size: 18px; }
.theme-dot { width: 18px; height: 18px; border-radius: 50%; box-shadow: inset 0 0 0 2px rgba(0,0,0,0.08); }
.dot-cream  { background: linear-gradient(135deg,#fffdf7 50%,#b07b3e 50%); }
.dot-sage   { background: linear-gradient(135deg,#fbfdf6 50%,#7c8c58 50%); }
.dot-sunset { background: linear-gradient(135deg,#fff7f1 50%,#cf8763 50%); }
.dot-sakura { background: linear-gradient(135deg,#fff8fb 50%,#d67a9a 50%); }
.dot-ocean  { background: linear-gradient(135deg,#f7fbfc 50%,#5b94a6 50%); }
.dot-night  { background: linear-gradient(135deg,#33323d 50%,#cba66a 50%); }

@media (max-width: 760px) {
  .workspace { flex-direction: column; padding: 18px 14px 70px; gap: 16px; }
  .sidebar { width: 100%; position: static; max-height: 260px; }
  .paper-sheet { padding: 24px 18px 22px; }
  .sheet-body[data-paper="lined"] {
    padding-left: 44px;
    background-image:
      linear-gradient(to right, transparent 34px, var(--margin-line) 34px, var(--margin-line) 36px, transparent 36px),
      repeating-linear-gradient(to bottom, transparent 0, transparent calc(var(--line-h) - 1px), var(--rule) calc(var(--line-h) - 1px), var(--rule) var(--line-h));
  }
  .topbar { padding: 11px 16px; }
  .topbar-title { font-size: 17px; }
  .sheet-title { font-size: 23px; }
}