:root {
  --bg: #f5f0e8;
  --bg2: #ede7d9;
  --ink: #1a1209;
  --ink2: #6b5c3e;
  --ink3: #9c8b70;
  --gold: #c8922a;
  --gold2: #e8b04a;
  --red: #b94030;
  --green: #3a7d44;
  --tile: #fff8ec;
  --tile-border: #d4c4a0;
  --shadow: rgba(30,20,5,0.12);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg);
  background-image:
    radial-gradient(ellipse at 20% 10%, rgba(200,146,42,0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 90%, rgba(185,64,48,0.06) 0%, transparent 60%);
  font-family: 'DM Sans', sans-serif;
  color: var(--ink);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 16px 60px;
}

header { text-align: center; margin-bottom: 28px; animation: fadeDown 0.6s ease both; }
.eyebrow-row {
  display: inline-flex; align-items: center; gap: 8px; margin-bottom: 6px;
}
.eyebrow {
  font-family: 'DM Mono', monospace;
  font-size: 10px; letter-spacing: 0.25em; text-transform: uppercase;
  color: var(--gold);
}
.archive-trigger {
  display: inline-flex; align-items: center;
  background: none; border: none; padding: 0;
  color: var(--ink3); cursor: pointer; opacity: 0.6;
  transition: opacity 0.2s;
}
.archive-trigger:hover { opacity: 1; }
.past-banner {
  font-family: 'DM Mono', monospace; font-size: 10px;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink3); margin-top: 6px;
}
.past-banner a { color: var(--gold); text-decoration: none; }
.past-banner a:hover { text-decoration: underline; }
h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(32px, 6vw, 52px); font-weight: 900; line-height: 1;
  color: var(--ink); letter-spacing: -0.02em;
}
h1 span { color: var(--gold); }
.subtitle { font-size: 13px; color: var(--ink2); margin-top: 8px; max-width: 340px; margin-left: auto; margin-right: auto; line-height: 1.5; }
.divider { width: 60px; height: 2px; background: linear-gradient(90deg, transparent, var(--gold), transparent); margin: 16px auto; }

.goal-bar {
  display: flex; align-items: center; gap: 10px;
  background: var(--tile); border: 1.5px solid var(--tile-border);
  border-radius: 12px; padding: 12px 20px; margin-bottom: 24px;
  box-shadow: 0 2px 12px var(--shadow);
  animation: fadeDown 0.7s ease 0.1s both;
  font-family: 'DM Mono', monospace;
}
.goal-word { font-size: 22px; font-weight: 500; letter-spacing: 0.12em; padding: 4px 12px; border-radius: 6px; }
.goal-word.start { color: var(--red); background: rgba(185,64,48,0.08); }
.goal-word.end   { color: var(--green); background: rgba(58,125,68,0.08); }
.goal-arrow { font-size: 18px; color: var(--ink3); flex: 1; text-align: center; }
.goal-label { font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink3); display: block; text-align: center; margin-top: 2px; }

.rules {
  font-size: 12px; color: var(--ink3); background: var(--bg2);
  border-radius: 8px; padding: 10px 16px; margin-bottom: 24px;
  line-height: 1.8; max-width: 480px; width: 100%;
  animation: fadeDown 0.7s ease 0.15s both;
}
.rules strong { color: var(--ink2); }

.step-pill {
  font-family: 'DM Mono', monospace; font-size: 11px; letter-spacing: 0.1em;
  color: var(--ink3); background: var(--bg2); border-radius: 20px;
  padding: 4px 12px; border: 1px solid var(--tile-border); margin-bottom: 16px;
  animation: fadeDown 0.7s ease 0.25s both;
}

#ladder {
  width: 100%; max-width: 480px; display: flex; flex-direction: column;
  animation: fadeDown 0.7s ease 0.2s both;
}

.rung {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 0; position: relative;
}
.rung:not(:last-child)::after {
  content: ''; position: absolute; left: 24px; bottom: -1px;
  width: 2px; height: 12px; background: var(--tile-border); z-index: 0;
}
.rung-num {
  font-family: 'DM Mono', monospace; font-size: 11px; color: var(--ink3);
  width: 20px; text-align: right; flex-shrink: 0;
}

.tiles { display: flex; gap: 6px; align-items: center; }
.tile {
  width: 44px; height: 52px; flex-shrink: 0;
  background: var(--tile); border: 2px solid var(--tile-border);
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  font-family: 'Playfair Display', serif; font-size: 22px; font-weight: 700;
  color: var(--ink);
  box-shadow: 0 2px 6px var(--shadow), inset 0 1px 0 rgba(255,255,255,0.8);
}
.tile.start-word { background: rgba(185,64,48,0.07); border-color: rgba(185,64,48,0.35); color: var(--red); }
.tile.end-word   { background: rgba(58,125,68,0.07); border-color: rgba(58,125,68,0.35); color: var(--green); }
.tile.changed    { background: rgba(200,146,42,0.1); border-color: var(--gold); color: var(--gold); animation: popTile 0.3s ease both; }
.tile.added      { background: rgba(58,125,68,0.08); border-color: rgba(58,125,68,0.4); color: var(--green); animation: popTile 0.3s ease both; }

.input-tiles { display: flex; align-items: center; }

.letter-input {
  width: 44px; height: 52px; flex-shrink: 0;
  background: white; border: 2px solid var(--gold);
  border-radius: 8px; text-align: center;
  font-family: 'Playfair Display', serif; font-size: 22px; font-weight: 700;
  color: var(--ink); outline: none;
  box-shadow: 0 2px 12px rgba(200,146,42,0.15), inset 0 1px 0 rgba(255,255,255,0.9);
  transition: border-color 0.2s, box-shadow 0.2s;
  text-transform: uppercase; caret-color: var(--gold); padding: 0;
  position: relative; z-index: 1;
}
.letter-input:focus {
  border-color: var(--gold2);
  box-shadow: 0 0 0 3px rgba(200,146,42,0.2), 0 2px 12px rgba(200,146,42,0.15);
}
.letter-input.empty {
  border: 2px dashed rgba(200,146,42,0.45);
  background: rgba(200,146,42,0.03);
}
.letter-input.error { border-color: var(--red) !important; animation: shake 0.35s ease; }

.insert-input {
  width: 6px; height: 52px; flex-shrink: 0;
  border: none; border-radius: 8px; background: transparent; padding: 0;
  font-family: 'Playfair Display', serif; font-size: 22px; font-weight: 700;
  text-align: center; text-transform: uppercase; color: var(--ink);
  transition: width 0.15s ease, background 0.15s ease, border 0.15s ease, box-shadow 0.15s ease;
  outline: none; caret-color: var(--gold); cursor: text;
}
.insert-input:focus {
  width: 44px;
  background: rgba(200,146,42,0.03);
  border: 2px dashed var(--gold2);
  box-shadow: 0 0 0 3px rgba(200,146,42,0.2), 0 2px 12px rgba(200,146,42,0.15);
}

.tile-wrap { position: relative; display: inline-flex; flex-direction: column; align-items: center; }
.del-hint {
  position: absolute; bottom: -15px;
  font-family: 'DM Mono', monospace; font-size: 8px; letter-spacing: 0.04em;
  color: var(--red); opacity: 0; transition: opacity 0.2s;
  pointer-events: none; white-space: nowrap;
}
.letter-input.empty:focus ~ .del-hint { opacity: 0.8; }
.insert-input:focus ~ .del-hint { opacity: 0.8; }

.action-row {
  display: flex; gap: 8px; align-items: center;
  margin-top: 14px; padding-left: 28px; max-width: 480px; width: 100%;
}
.btn-submit {
  flex: 1; padding: 11px 20px;
  background: var(--ink); color: var(--bg);
  border: none; border-radius: 10px;
  font-family: 'DM Mono', monospace; font-size: 12px;
  letter-spacing: 0.15em; text-transform: uppercase;
  cursor: pointer; box-shadow: 0 3px 12px rgba(0,0,0,0.2);
  transition: background 0.2s, transform 0.1s;
}
.btn-submit:hover { background: #2d2010; transform: translateY(-1px); }
.btn-submit:active { transform: translateY(0); }
.btn-undo {
  padding: 11px 16px; background: var(--tile); color: var(--ink2);
  border: 1.5px solid var(--tile-border); border-radius: 10px;
  font-family: 'DM Mono', monospace; font-size: 12px; letter-spacing: 0.1em;
  cursor: pointer; transition: background 0.2s, border-color 0.2s;
}
.btn-undo:hover { background: var(--bg2); border-color: var(--ink3); }
.btn-undo:disabled { opacity: 0.35; cursor: default; pointer-events: none; }

#message {
  max-width: 480px; width: 100%; margin-top: 14px;
  text-align: center; font-size: 13px; min-height: 20px;
  display: flex; align-items: center; justify-content: center;
  padding: 8px 16px; border-radius: 8px; transition: all 0.3s ease;
  font-family: 'DM Mono', monospace; letter-spacing: 0.05em;
}
#message.error   { background: rgba(185,64,48,0.08); color: var(--red); }
#message.success { background: rgba(58,125,68,0.1);  color: var(--green); }
#message.info    { background: rgba(200,146,42,0.08); color: var(--gold); }

.win-banner {
  max-width: 480px; width: 100%;
  background: var(--ink); color: var(--bg); border-radius: 14px;
  padding: 28px 24px; text-align: center; margin-top: 16px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
  display: none;
}
.win-banner.show { display: block; animation: fadeUp 0.5s ease both; }
.win-banner h2 { font-family: 'Playfair Display', serif; font-size: 28px; color: var(--gold2); margin-bottom: 8px; }
.win-banner p  { font-size: 13px; color: var(--bg2); line-height: 1.6; }
.step-count    { font-family: 'DM Mono', monospace; font-size: 42px; color: var(--gold2); line-height: 1; margin: 12px 0 4px; }
.win-banner small { font-size: 11px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--ink3); }
.optimal-hint { font-family: 'DM Mono', monospace; font-size: 11px; color: var(--gold2); margin-top: 6px; letter-spacing: 0.05em; }

.share-row {
  display: flex; gap: 8px; margin-bottom: 12px;
}
.btn-share {
  flex: 1; padding: 10px 14px;
  background: rgba(255,255,255,0.08); color: var(--bg);
  border: 1.5px solid rgba(255,255,255,0.15); border-radius: 10px;
  font-family: 'DM Mono', monospace; font-size: 11px;
  letter-spacing: 0.1em; text-transform: uppercase;
  cursor: pointer; transition: background 0.2s;
  white-space: nowrap;
}
.btn-share:hover { background: rgba(255,255,255,0.18); }
.btn-share-x { border-color: rgba(255,255,255,0.2); }

.win-actions {
  display: flex; gap: 8px; margin-top: 18px; justify-content: center;
}
.btn-restart, .btn-archive {
  padding: 11px 20px; border: none; border-radius: 10px;
  font-family: 'DM Mono', monospace; font-size: 12px; letter-spacing: 0.15em;
  text-transform: uppercase; cursor: pointer; font-weight: 500; transition: background 0.2s;
}
.btn-restart { background: var(--gold); color: var(--ink); }
.btn-restart:hover { background: var(--gold2); }
.btn-archive { background: rgba(255,255,255,0.08); color: var(--bg); }
.btn-archive:hover { background: rgba(255,255,255,0.16); }

/* ── Mobile toolbar ── */
.mobile-toolbar {
  display: none; gap: 8px; align-items: center;
  padding: 10px 0 0; padding-left: 28px;
  max-width: 480px; width: 100%;
}
.tool-btn {
  flex: 1; padding: 9px 8px;
  background: var(--tile); border: 1.5px solid var(--tile-border);
  border-radius: 8px; font-family: 'DM Mono', monospace;
  font-size: 11px; letter-spacing: 0.08em; color: var(--ink2);
  cursor: pointer; transition: background 0.15s, border-color 0.15s;
  user-select: none; -webkit-user-select: none; touch-action: manipulation;
}
.tool-btn:active { background: var(--bg2); }
.tool-btn-del { color: var(--red); border-color: rgba(185,64,48,0.25); }
.tool-btn-del:active { background: rgba(185,64,48,0.06); }
.tool-btn:disabled { opacity: 0.3; pointer-events: none; }

footer {
  margin-top: 40px; text-align: center;
  font-family: 'DM Mono', monospace; font-size: 10px;
  letter-spacing: 0.08em; color: var(--ink3);
}
footer a { color: var(--ink3); text-decoration: underline; text-underline-offset: 3px; }
footer a:hover { color: var(--ink2); }

@keyframes fadeDown  { from{opacity:0;transform:translateY(-12px)} to{opacity:1;transform:translateY(0)} }
@keyframes fadeUp    { from{opacity:0;transform:translateY(12px)}  to{opacity:1;transform:translateY(0)} }
@keyframes slideIn   { from{opacity:0;transform:translateY(8px)}   to{opacity:1;transform:translateY(0)} }
@keyframes popTile   { 0%{transform:scale(0.8);opacity:0.5} 60%{transform:scale(1.1)} 100%{transform:scale(1);opacity:1} }
@keyframes shake     { 0%,100%{transform:translateX(0)} 20%{transform:translateX(-5px)} 40%{transform:translateX(5px)} 60%{transform:translateX(-4px)} 80%{transform:translateX(4px)} }

@media (max-width:400px) {
  .tile, .letter-input { width: 38px; height: 46px; font-size: 19px; }
  .insert-input:focus { width: 38px; }
}

/* ── Calendar ─────────────────────────────────────────────────────────────── */
.cal-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.55); z-index: 100;
  align-items: center; justify-content: center;
}
.cal-overlay.show { display: flex; }

.cal-modal {
  background: var(--ink); color: var(--bg);
  border-radius: 16px; padding: 20px;
  width: min(360px, 92vw);
  box-shadow: 0 16px 48px rgba(0,0,0,0.4);
  animation: fadeUp 0.25s ease both;
}

.cal-header {
  display: flex; align-items: center; gap: 8px; margin-bottom: 16px;
}
.cal-month-label {
  flex: 1; text-align: center;
  font-family: 'Playfair Display', serif; font-size: 17px; color: var(--gold2);
}
.cal-nav {
  background: none; border: none; color: var(--ink3);
  font-size: 16px; cursor: pointer; padding: 4px 8px; border-radius: 6px;
  transition: color 0.2s;
}
.cal-nav:hover:not(:disabled) { color: var(--gold2); }
.cal-nav:disabled { opacity: 0.2; pointer-events: none; }
.cal-close {
  background: none; border: none; color: var(--ink3);
  font-size: 14px; cursor: pointer; padding: 4px 6px; border-radius: 6px;
  margin-left: 4px; transition: color 0.2s;
}
.cal-close:hover { color: var(--bg); }

.cal-grid {
  display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px;
}
.cal-day-header {
  font-family: 'DM Mono', monospace; font-size: 9px;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink3); text-align: center; padding: 4px 0 6px;
}
.cal-cell {
  aspect-ratio: 1; border-radius: 8px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 1px;
  font-family: 'DM Mono', monospace;
}
.cal-empty { background: none; }
.cal-future { opacity: 0.2; }
.cal-future .cal-day-num { font-size: 12px; color: var(--ink3); }

.cal-available {
  cursor: pointer;
  background: rgba(255,255,255,0.05);
  transition: background 0.15s;
}
.cal-available:hover { background: rgba(255,255,255,0.12); }

.cal-today { outline: 1.5px solid var(--gold); }

.cal-solved { background: rgba(200,146,42,0.18); }
.cal-solved:hover { background: rgba(200,146,42,0.28); }
.cal-solved.cal-optimal { background: rgba(200,146,42,0.32); }
.cal-solved.cal-optimal:hover { background: rgba(200,146,42,0.45); }

.cal-active { outline: 1.5px solid var(--gold2); }

.cal-day-num {
  font-size: 12px; color: var(--bg2); line-height: 1;
}
.cal-solved .cal-day-num { color: var(--gold2); }
.cal-steps {
  font-size: 9px; color: var(--gold); line-height: 1;
}
.cal-optimal .cal-steps { color: var(--gold2); }