:root {
  --bg: #f4c84c;
  --paper: #fff3a6;
  --paper-deep: #ffe477;
  --surface-alt: #f7d85b;
  --text: #272014;
  --muted: #755f2a;
  --line: #dfb946;
  --rule: #7db4c8;
  --margin-line: #e26d5a;
  --margin-line-soft: rgba(203, 124, 112, 0.75);
  --accent: #1685a5;
  --accent-strong: #0d667e;
  --focus: #c4502d;
  --shadow: 0 22px 70px rgba(97, 72, 15, 0.24);
}

* {
  box-sizing: border-box;
}

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

body {
  position: relative;
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 12%, rgba(255, 255, 255, 0.55), transparent 28%),
    linear-gradient(115deg, rgba(255, 239, 130, 0.7), rgba(244, 200, 76, 0.2)),
    var(--bg);
  color: var(--text);
  font-family:
    "Segoe UI",
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  overflow: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(153, 102, 16, 0.12) 1px, transparent 1px),
    linear-gradient(180deg, rgba(153, 102, 16, 0.1) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 72%);
}

.water-shape {
  position: fixed;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(circle at 30% 25%, rgba(255, 255, 255, 0.65), transparent 18%),
    linear-gradient(135deg, rgba(61, 194, 218, 0.9), rgba(17, 124, 171, 0.85));
  box-shadow: inset 18px -18px 45px rgba(12, 91, 125, 0.25);
}

.water-shape-large {
  right: max(-90px, -7vw);
  bottom: max(-78px, -7vw);
  width: min(34vw, 380px);
  aspect-ratio: 1.12;
  border-radius: 54% 46% 59% 41% / 41% 52% 48% 59%;
  transform: rotate(-14deg);
  opacity: 0.72;
}

.water-shape-small {
  left: clamp(14px, 4vw, 58px);
  top: clamp(86px, 14vh, 150px);
  width: min(15vw, 150px);
  aspect-ratio: 1;
  border-radius: 47% 53% 35% 65% / 62% 34% 66% 38%;
  transform: rotate(22deg);
  opacity: 0.46;
}

button,
input,
textarea {
  font: inherit;
}

.app-shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  width: min(1080px, calc(100vw - 72px));
  height: min(820px, calc(100vh - 40px));
  min-height: 520px;
  margin: 20px auto;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.tabbar {
  display: flex;
  align-items: end;
  gap: 4px;
  min-height: 38px;
  padding: 6px 8px 0;
  overflow-x: auto;
  background: #f0c954;
  border-bottom: 1px solid var(--line);
}

.document-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 116px;
  max-width: 220px;
  height: 32px;
  padding: 0 8px 0 10px;
  border: 1px solid var(--line);
  border-bottom: 0;
  border-radius: 6px 6px 0 0;
  background: #ffe786;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
}

.document-tab[aria-selected="true"] {
  height: 34px;
  background: var(--paper);
  color: var(--text);
}

.document-tab:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: -2px;
}

.document-tab span:first-child {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tab-close {
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  border-radius: 4px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1;
}

.tab-close:hover {
  background: rgba(117, 95, 42, 0.14);
  color: var(--text);
}

.topbar,
.statusbar {
  display: flex;
  align-items: center;
  min-height: 52px;
  background: var(--surface-alt);
  border-bottom: 1px solid var(--line);
}

.topbar {
  justify-content: space-between;
  gap: 14px;
  padding: 10px 12px;
}

.title-group {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 10px;
  flex: 1;
  max-width: 620px;
  padding: 5px;
  border: 1px solid rgba(22, 133, 165, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.24);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.42);
}

.app-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: white;
  font-weight: 700;
  box-shadow: 0 8px 18px rgba(13, 102, 126, 0.22);
}

.title-input {
  width: 100%;
  min-width: 90px;
  height: 36px;
  padding: 0 12px;
  border: 1px solid transparent;
  border-radius: 7px;
  background: rgba(255, 246, 188, 0.62);
  color: var(--text);
  font-size: 16px;
  font-weight: 700;
  transition:
    background 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.title-input:focus {
  border-color: rgba(22, 133, 165, 0.58);
  background: #fffdf0;
  box-shadow: 0 0 0 3px rgba(22, 133, 165, 0.14);
  outline: none;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 0 0 auto;
}

.icon-button {
  display: grid;
  place-items: center;
  width: 36px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff6bc;
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  user-select: none;
}

.icon-button:hover {
  border-color: #aeb7c4;
  background: #fff1a1;
}

.icon-button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.file-button input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.editor-panel {
  position: relative;
  min-height: 0;
  background:
    linear-gradient(
      90deg,
      transparent 0 30px,
      var(--margin-line-soft) 30px 32px,
      transparent 32px 33px,
      var(--margin-line) 33px 35px,
      transparent 35px
    ),
    var(--paper);
}

#editor {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  min-height: 0;
  resize: none;
  padding: 30px 28px 28px 44px;
  border: 0;
  outline: none;
  background:
    linear-gradient(
      90deg,
      transparent 0 30px,
      var(--margin-line-soft) 30px 32px,
      transparent 32px 33px,
      var(--margin-line) 33px 35px,
      transparent 35px
    ),
    radial-gradient(ellipse at 92% 14%, rgba(61, 194, 218, 0.2), transparent 20%),
    linear-gradient(to bottom, transparent 31px, rgba(22, 133, 165, 0.32) 32px),
    linear-gradient(180deg, rgba(255, 249, 190, 0.84), rgba(255, 229, 123, 0.62)),
    var(--paper);
  background-repeat: no-repeat, no-repeat, repeat, no-repeat, no-repeat;
  background-size: 100% 100%, 100% 100%, 100% 32px, 100% 100%, 100% 100%;
  color: #211a10;
  font-family:
    "Cascadia Mono",
    "Consolas",
    "SFMono-Regular",
    monospace;
  font-size: 16px;
  line-height: 32px;
  tab-size: 2;
}

#editor::placeholder {
  color: #8f7b42;
}

.text-sticker {
  position: absolute;
  z-index: 2;
  pointer-events: none;
  padding: 7px 10px;
  border: 1px solid rgba(22, 133, 165, 0.18);
  border-radius: 999px;
  background: rgba(255, 248, 185, 0.5);
  box-shadow: 0 10px 24px rgba(92, 68, 10, 0.12);
  font-size: clamp(18px, 2.5vw, 26px);
  line-height: 1;
  opacity: 0.72;
}

.sticker-love {
  top: 22px;
  right: clamp(18px, 4vw, 46px);
}

.sticker-flower {
  right: clamp(20px, 5vw, 70px);
  bottom: 24px;
}

.statusbar {
  justify-content: flex-start;
  gap: 18px;
  min-height: 34px;
  padding: 0 12px;
  border-top: 1px solid var(--line);
  border-bottom: 0;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

.statusbar span:first-child {
  color: var(--accent-strong);
  font-weight: 600;
}

/* ── Tablet (621 – 900 px) ─────────────────────────────────────────── */
@media (max-width: 900px) {
  .app-shell {
    width: calc(100vw - 32px);
    height: calc(100vh - 32px);
    min-height: calc(100vh - 32px);
    margin: 16px auto;
  }

  .title-group {
    max-width: 100%;
  }
}

/* ── Mobile (≤ 620 px) ─────────────────────────────────────────────── */
@media (max-width: 620px) {
  /* make sure the whole viewport is used with no bounce-scroll */
  html,
  body {
    height: 100%;
    overflow: hidden;
  }

  .app-shell {
    width: 100vw;
    height: 100dvh; /* dynamic viewport height – accounts for browser chrome */
    min-height: 100dvh;
    margin: 0;
    border: 0;
    border-radius: 0;
  }

  /* ── Topbar: stack title above toolbar ── */
  .topbar {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    min-height: unset;
    padding: 8px 10px;
  }

  .title-group {
    max-width: 100%;
  }

  /* ── Toolbar: four equal buttons in one row ── */
  .toolbar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    width: 100%;
  }

  .icon-button {
    width: 100%;
    height: 36px;
  }

  /* ── Tabbar ── */
  .tabbar {
    min-height: 36px;
    padding-inline: 6px;
  }

  .document-tab {
    min-width: 100px;
    max-width: 160px;
    font-size: 12px;
  }

  /* ── Editor: remove the wide left margin on narrow screens ── */
  .editor-panel {
    background:
      linear-gradient(
        90deg,
        transparent 0 30px,
        var(--margin-line-soft) 30px 32px,
        transparent 32px 33px,
        var(--margin-line) 33px 35px,
        transparent 35px
      ),
      var(--paper);
  }

  #editor {
    padding: 30px 14px 18px 40px;
    font-size: 15px;
    line-height: 30px;
    background:
      linear-gradient(
        90deg,
        transparent 0 30px,
        var(--margin-line-soft) 30px 32px,
        transparent 32px 33px,
        var(--margin-line) 33px 35px,
        transparent 35px
      ),
      radial-gradient(ellipse at 92% 14%, rgba(61, 194, 218, 0.2), transparent 20%),
      linear-gradient(to bottom, transparent 29px, rgba(22, 133, 165, 0.32) 30px),
      linear-gradient(180deg, rgba(255, 249, 190, 0.84), rgba(255, 229, 123, 0.62)),
      var(--paper);
    background-repeat: no-repeat, no-repeat, repeat, no-repeat, no-repeat;
    background-size: 100% 100%, 100% 100%, 100% 30px, 100% 100%, 100% 100%;
  }

  /* ── Status bar: scrollable, smaller text ── */
  .statusbar {
    gap: 10px;
    min-height: 30px;
    padding: 0 10px;
    font-size: 11px;
    overflow-x: auto;
    /* hide scrollbar visually but keep it functional */
    scrollbar-width: none;
  }

  .statusbar::-webkit-scrollbar {
    display: none;
  }

  /* ── Decorative stickers: center both stickers on mobile ── */
  .text-sticker {
    display: block;
    opacity: 0.3;
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    background: transparent;
    border-color: transparent;
    box-shadow: none;
    font-size: clamp(25px, 8vw, 35px);
    padding: 0 8px;
  }

  .sticker-love {
    top: 42%;
    bottom: auto;
  }

  .sticker-flower {
    top: 58%;
    bottom: auto;
  }

  /* ── Decorative water shapes: scale down ── */
  .water-shape-large {
    width: min(50vw, 200px);
  }

  .water-shape-small {
    display: none;
  }
}