:root {
    --bg-primary: #0a0a1a;
    --bg-secondary: #111128;
    --card-bg: #1a1a2e;
    --border: rgba(255,255,255,0.1);
    --text-primary: #ffffff;
    --text-secondary: rgba(255,255,255,0.7);
    --text-muted: rgba(255,255,255,0.4);
    --accent: #7c3aed;
    --accent-hover: #6d28d9;
    --tile-correct: #538d4e;
    --tile-present: #b59f3b;
    --tile-absent: #3a3a3c;
    --key-bg: #818384;
    --key-text: #ffffff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { overflow-x: hidden; }

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    user-select: none;
}

.app {
    width: 100%;
    max-width: 700px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding-bottom: 20px;
}

/* ── Header ── */
.header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 4px;
}

.header-back {
    font-size: 1.4rem;
    text-decoration: none;
    opacity: 0.7;
    transition: opacity 0.2s;
    flex-shrink: 0;
}
.header-back:hover { opacity: 1; }

.header-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.header-title {
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.header-actions { display: flex; gap: 8px; flex-shrink: 0; }

.icon-btn {
    background: none;
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 8px;
    transition: background 0.2s;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}
.icon-btn:hover { background: rgba(255,255,255,0.08); }

/* ── Stage badge ── */
.stage-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 800;
    padding: 2px 10px;
    border-radius: 20px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transition: background 0.4s, color 0.4s;
}
.stage-badge--solo     { background: #538d4e; color: #fff; }
.stage-badge--duo      { background: #1e6fdb; color: #fff; }
.stage-badge--quarteto { background: #9333ea; color: #fff; }
.stage-badge--desafio  { background: linear-gradient(90deg,#f59e0b,#ef4444); color: #fff; }

/* ── Top bar ── */
.top-bar {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4px 16px 8px;
}

.date-badge {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.attempts-counter {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 0.05em;
}

/* ── Boards container ── */
.boards-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 8px;
    width: 100%;
    padding: 0 8px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.board-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    transition: opacity 0.3s;
}

.board-wrap.board-solved { opacity: 0.75; }

.board-label {
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    min-height: 16px;
    transition: color 0.3s;
}
.board-label.solved { color: var(--tile-correct); }

/* Board grid — rows count set via inline style from JS */
.board {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.board-row {
    display: flex;
    gap: 4px;
}

/* Tile sizes by board count */
.boards-count-1 .tile { width: 58px; height: 58px; font-size: 1.6rem; }
.boards-count-2 .tile { width: 50px; height: 50px; font-size: 1.35rem; }
.boards-count-4 .tile { width: 42px; height: 42px; font-size: 1.1rem; }
.boards-count-6 .tile { width: 36px; height: 36px; font-size: 0.95rem; }

@media (max-width: 400px) {
    .boards-count-1 .tile { width: 50px; height: 50px; font-size: 1.35rem; }
    .boards-count-2 .tile { width: 42px; height: 42px; font-size: 1.1rem; }
    .boards-count-4 .tile { width: 34px; height: 34px; font-size: 0.88rem; }
    .boards-count-6 .tile { width: 30px; height: 30px; font-size: 0.78rem; }
    .boards-container { gap: 4px; padding: 0 4px; }
}

/* Tile base */
.tile {
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    text-transform: uppercase;
    border-radius: 4px;
    transition: border-color 0.1s;
}

.tile--filled {
    border-color: rgba(255,255,255,0.4);
    animation: pop 0.1s ease;
}

.tile--correct { background: var(--tile-correct); border-color: var(--tile-correct); color: #fff; }
.tile--present { background: var(--tile-present); border-color: var(--tile-present); color: #fff; }
.tile--absent  { background: var(--tile-absent);  border-color: var(--tile-absent);  color: #fff; }

.tile--cursor {
    border-color: #fff !important;
    box-shadow: 0 0 0 2px rgba(255,255,255,0.25);
    animation: cursor-pulse 1s ease-in-out infinite;
}

@keyframes cursor-pulse {
    0%, 100% { border-color: rgba(255,255,255,0.9); }
    50%       { border-color: rgba(255,255,255,0.35); }
}

/* Make current-row tiles clickable */
.tile { cursor: pointer; }
.tile--correct, .tile--present, .tile--absent { cursor: default; }

.tile--flip { animation: flip 0.5s ease forwards; }

@keyframes pop {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.12); }
    100% { transform: scale(1); }
}

@keyframes flip {
    0%   { transform: rotateX(0); }
    50%  { transform: rotateX(-90deg); }
    100% { transform: rotateX(0); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%       { transform: translateX(-6px); }
    40%       { transform: translateX(6px); }
    60%       { transform: translateX(-4px); }
    80%       { transform: translateX(4px); }
}

.board-row--shake { animation: shake 0.4s ease; }

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    40%       { transform: translateY(-20px); }
    60%       { transform: translateY(-10px); }
}

.tile--bounce { animation: bounce 0.5s ease; }

/* ── Keyboard ── */
.keyboard {
    width: 100%;
    padding: 0 4px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.keyboard-row {
    display: flex;
    justify-content: center;
    gap: 5px;
}

.key {
    height: 56px;
    min-width: 34px;
    padding: 0 6px;
    border: none;
    border-radius: 6px;
    background: var(--key-bg);
    color: var(--key-text);
    font-family: 'Poppins', sans-serif;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    text-transform: uppercase;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transition: background 0.2s, transform 0.1s;
    flex: 1;
    max-width: 42px;
}

.key--wide  { max-width: 64px; font-size: 0.75rem; }
.key--accent { max-width: 36px; min-width: 26px; height: 44px; font-size: 0.75rem; padding: 0 2px; }
.key:active { transform: scale(0.95); }
.key:disabled { opacity: 0.5; cursor: default; }
.key--correct { background: var(--tile-correct) !important; }
.key--present { background: var(--tile-present) !important; }
.key--absent  { background: var(--tile-absent) !important; color: rgba(255,255,255,0.5) !important; }

/* ── Modal ── */
.modal {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    box-sizing: border-box;
}

.modal.hidden { display: none; }

.modal-backdrop {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.75);
}

.modal-content {
    position: relative;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 28px 24px;
    max-width: 380px;
    width: 100%;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-icon { font-size: 2.5rem; }
.modal-title { font-size: 1.3rem; font-weight: 700; }
.modal-subtitle { font-size: 0.9rem; color: var(--text-secondary); }

/* ── Result words ── */
.result-words {
    display: flex;
    flex-direction: column;
    gap: 6px;
    background: rgba(255,255,255,0.03);
    border-radius: 12px;
    padding: 12px;
}

.result-word-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px;
    border-radius: 8px;
    background: rgba(255,255,255,0.04);
}

.result-word-item.solved { background: rgba(83,141,78,0.15); }
.result-word-item.unsolved { background: rgba(239,68,68,0.1); }

.result-word-num {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.result-word-val {
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: 0.18em;
}

.result-word-item.solved .result-word-val { color: var(--tile-correct); }
.result-word-item.unsolved .result-word-val { color: #ef4444; }

.result-emoji {
    font-size: 1.1rem;
    line-height: 1.6;
    background: rgba(255,255,255,0.04);
    border-radius: 10px;
    padding: 12px;
    font-family: monospace;
    white-space: pre;
    overflow-x: auto;
    text-align: left;
}

/* ── Buttons ── */
.btn {
    padding: 14px 20px;
    border: none;
    border-radius: 12px;
    font-family: 'Poppins', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: default; }
.btn.hidden { display: none; }
.btn-accent    { background: linear-gradient(135deg,#f59e0b,#ef4444); color: #fff; font-size: 1rem; }
.btn-accent:hover { filter: brightness(1.1); }
.btn-retry     { background: rgba(239,68,68,0.15); color: #f87171; border: 1px solid rgba(239,68,68,0.3); }
.btn-retry:hover { background: rgba(239,68,68,0.25); }
.btn-primary   { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: rgba(255,255,255,0.1); color: var(--text-primary); }
.btn-secondary:hover { background: rgba(255,255,255,0.15); }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { background: rgba(255,255,255,0.06); }

/* ── Input ── */
.input-field {
    width: 100%;
    padding: 14px 16px;
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}
.input-field:focus { border-color: var(--accent); }

/* ── Ranking ── */
.ranking-list { display: flex; flex-direction: column; gap: 8px; text-align: left; }

.ranking-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: rgba(255,255,255,0.04);
    border-radius: 10px;
}

.ranking-pos { font-weight: 700; font-size: 1rem; min-width: 24px; }
.ranking-name { flex: 1; font-size: 0.9rem; }
.ranking-attempts { font-size: 0.85rem; color: var(--text-secondary); }
.ranking-loading { display: flex; justify-content: center; padding: 20px; }

/* ── Help ── */
.help-body { text-align: left; display: flex; flex-direction: column; gap: 10px; font-size: 0.88rem; color: var(--text-secondary); }
.help-body strong { color: var(--text-primary); }
.help-stages { display: flex; flex-direction: column; gap: 6px; padding: 8px 0; }
.help-stage { font-size: 0.88rem; padding: 4px 0; }
.help-examples { display: flex; flex-direction: column; gap: 6px; }
.help-ex-label { font-size: 0.88rem; }

/* ── Toast ── */
.toast {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255,255,255,0.95);
    color: #111;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    z-index: 99999;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    white-space: nowrap;
}

.toast.visible { opacity: 1; }
.toast.hidden { display: none; }

/* ── Loader ── */
.loader-sm {
    width: 24px; height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }