/* paavi.com — green-to-light-green gradient palette. */

:root {
  --green-deep:   #1f6b3a;
  --green:        #2f9e54;
  --green-mid:    #6cc488;
  --green-light:  #b9e9c6;
  --green-pale:   #e8f7ec;
  --green-ink:    #0f3a1f;
  --gold:         #c9a13a;
  --gold-light:   #f6d77a;
  --wall:         #214d2c;
  --wall-edge:    #1a3a22;
  --floor:        #f4fbf6;
  --floor-goal:   #d6f0df;
  --box:          #d68a3c;
  --box-edge:     #a05c1b;
  --box-on-goal:  #3aa55a;
  --box-on-goal-edge: #1f6b3a;
  --player:       #1f3a5f;
  --player-edge:  #0f1f3a;
  --shadow:       0 8px 24px rgba(15, 58, 31, 0.18);
  --shadow-sm:    0 2px 6px rgba(15, 58, 31, 0.16);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--green-ink);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(108,196,136,0.35), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(185,233,198,0.55), transparent 55%),
    linear-gradient(180deg, var(--green-pale) 0%, #ffffff 70%);
  min-height: 100vh;
  line-height: 1.55;
}

a { color: var(--green-deep); }
a:hover { color: var(--green); }

/* ----- Hero ----- */
.hero {
  background:
    linear-gradient(135deg, var(--green-deep) 0%, var(--green) 45%, var(--green-mid) 100%);
  color: #fff;
  padding: 3.5rem 1.25rem 4rem;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.hero::after {
  /* subtle bling: diagonal sheen */
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,0.12) 50%, transparent 70%);
  pointer-events: none;
}
.hero-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.75rem;
  position: relative;
}
.mitre {
  display: inline-block;
  width: 64px;
  height: 80px;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.25));
  transition: transform 0.2s ease;
  text-decoration: none;
}
.mitre:hover { transform: translateY(-2px) rotate(-2deg); }
.mitre svg { width: 100%; height: 100%; display: block; }

.hero h1 {
  margin: 0.25rem 0 0;
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  letter-spacing: 0.02em;
  font-weight: 700;
  text-shadow: 0 2px 12px rgba(0,0,0,0.18);
}
.hero h1 .dot { color: var(--gold-light); }
.tagline {
  margin: 0;
  color: rgba(255,255,255,0.92);
  font-size: 1.05rem;
}

/* ----- Main content ----- */
main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}
.intro p { margin: 0 0 1rem; }
.intro {
  background: rgba(255,255,255,0.7);
  padding: 1.25rem 1.5rem;
  border-left: 4px solid var(--green-mid);
  border-radius: 6px;
  box-shadow: var(--shadow-sm);
}

/* ----- Sokoban ----- */
.sokoban {
  margin-top: 2.5rem;
  background: #ffffff;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--green-light);
}
.sokoban-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.sokoban-header h2 {
  margin: 0;
  color: var(--green-deep);
  font-size: 1.5rem;
}
.sokoban-stats {
  display: flex;
  gap: 1rem;
  font-size: 0.95rem;
  color: var(--green-ink);
}
.sokoban-stats strong {
  color: var(--green-deep);
  font-variant-numeric: tabular-nums;
}

.sokoban-board-wrap {
  position: relative;
  background: linear-gradient(180deg, var(--green-pale), #ffffff);
  border-radius: 8px;
  padding: 1rem;
  border: 1px solid var(--green-light);
  overflow: auto;
}
.sokoban-board {
  display: grid;
  gap: 0;
  width: max-content;
  margin: 0 auto;
  outline: none;
  user-select: none;
}
.sokoban-board:focus {
  box-shadow: 0 0 0 3px rgba(47, 158, 84, 0.35);
  border-radius: 4px;
}

/* Cell sizing scales via CSS custom property set in JS. */
.sokoban-cell {
  width: var(--cell, 28px);
  height: var(--cell, 28px);
  position: relative;
  background: transparent;
}
.sokoban-cell.floor { background: var(--floor); }
.sokoban-cell.wall {
  background: var(--wall);
  box-shadow: inset 0 -2px 0 var(--wall-edge), inset 0 2px 0 #2a5a36;
}
.sokoban-cell.goal::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 35%; height: 35%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, var(--gold-light), var(--gold) 70%);
  box-shadow: 0 0 6px rgba(201,161,58,0.5);
}
.sokoban-cell .box {
  position: absolute;
  inset: 10%;
  background: linear-gradient(160deg, #efb070, var(--box) 50%, #b06820);
  border: 1px solid var(--box-edge);
  border-radius: 4px;
  box-shadow: inset 0 0 0 2px rgba(255,255,255,0.15), 0 1px 2px rgba(0,0,0,0.2);
}
.sokoban-cell.goal .box {
  background: linear-gradient(160deg, #7adf95, var(--box-on-goal) 50%, #1f6b3a);
  border-color: var(--box-on-goal-edge);
  box-shadow: inset 0 0 0 2px rgba(255,255,255,0.2), 0 0 8px rgba(47,158,84,0.6);
}
.sokoban-cell .player {
  position: absolute;
  inset: 12%;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #6f8fc8, var(--player) 70%);
  border: 1px solid var(--player-edge);
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.sokoban-overlay {
  position: absolute;
  inset: 0;
  background: rgba(31, 107, 58, 0.78);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  border-radius: 8px;
  text-align: center;
  backdrop-filter: blur(2px);
}
.sokoban-overlay[hidden] { display: none; }
.sokoban-overlay p {
  margin: 0 0 1rem;
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ----- Controls ----- */
.sokoban-controls {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  align-items: center;
}
.dpad {
  display: grid;
  grid-template-columns: repeat(3, 44px);
  grid-template-rows: repeat(3, 44px);
  gap: 4px;
}
.dpad button {
  background: linear-gradient(180deg, var(--green-mid), var(--green));
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.05s ease, filter 0.15s ease;
}
.dpad button:hover { filter: brightness(1.08); }
.dpad button:active { transform: translateY(1px); }
.dpad-up    { grid-column: 2; grid-row: 1; }
.dpad-left  { grid-column: 1; grid-row: 2; }
.dpad-down  { grid-column: 2; grid-row: 3; }
.dpad-right { grid-column: 3; grid-row: 2; }

.ctrl-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}
.ctrl-buttons button {
  background: #fff;
  border: 1px solid var(--green-mid);
  color: var(--green-deep);
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: background 0.15s ease, color 0.15s ease;
}
.ctrl-buttons button:hover {
  background: var(--green-pale);
}
.ctrl-buttons button:active {
  background: var(--green-light);
}
.lvl-jump {
  font-size: 0.9rem;
  color: var(--green-deep);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.lvl-jump input {
  width: 4.5rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--green-mid);
  border-radius: 6px;
  font-size: 0.95rem;
  color: var(--green-ink);
  background: #fff;
}

.sokoban-help {
  margin: 1rem 0 0;
  font-size: 0.9rem;
  color: #486b53;
}
.sokoban-help kbd {
  background: var(--green-pale);
  border: 1px solid var(--green-light);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 0.35em;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.85em;
  margin: 0 0.1em;
}

/* ----- Footer ----- */
footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
  font-size: 0.9rem;
  color: #486b53;
  text-align: center;
}

/* ----- Responsive tweaks ----- */
@media (max-width: 560px) {
  .sokoban { padding: 1rem; }
  .sokoban-stats { font-size: 0.85rem; gap: 0.6rem; }
  .dpad { grid-template-columns: repeat(3, 40px); grid-template-rows: repeat(3, 40px); }
}