@import url('https://fonts.googleapis.com/css2?family=Fredoka:wght@400;600;700&display=swap');

/* =========================================================
   CSS VARIABLES
   ========================================================= */
:root {
    --key-bg:        #ffffff;
    --accent:        #0891b2;
    --accent-shadow: #0284c7;
    --board-bg:      #cffafe;
    --board-border:  #67e8f9;
    --bg:            #e0f2fe;
    --text-main:     #1e293b;
    --text-muted:    #64748b;
    --text-sub:      #94a3b8;
}

/* =========================================================
   RESET & BASE
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Fredoka', sans-serif;
    background-color: var(--bg);
    overflow: hidden;
    user-select: none;
    height: 100vh;
    width: 100vw;
    transition: background-color 0.5s ease;
}

/* Dot grid background */
body::before {
    content: '';
    position: fixed; inset: 0;
    background-image: radial-gradient(var(--board-border) 1.5px, transparent 1.5px);
    background-size: 24px 24px;
    opacity: 0.5;
    z-index: 0;
    pointer-events: none;
}

/* =========================================================
   HEADER
   ========================================================= */
#header {
    position: fixed;
    top: 0; left: 0; right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    z-index: 30;
    pointer-events: all;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255,255,255,0.88);
    border-radius: 16px;
    padding: 9px 18px;
    border: 2px solid rgba(255,255,255,0.95);
    box-shadow: 0 4px 15px rgba(0,0,0,0.07);
}
.logo i    { font-size: 1.5rem; color: var(--accent); }
.logo span { font-size: 1.2rem; font-weight: 700; color: var(--text-main); }

/* Right side of header */
.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.menu-btn {
    width: 44px; height: 44px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.95);
    background: rgba(255,255,255,0.88);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 1rem;
    transition: color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.menu-btn:hover {
    color: var(--accent);
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(0,0,0,0.12);
}

.progress-badge {
    background: rgba(255,255,255,0.9);
    border-radius: 50px;
    padding: 8px 18px;
    border: 2.5px solid var(--accent);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    gap: 7px;
    align-items: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.09);
}
.progress-badge i         { color: var(--accent); font-size: 1rem; }
.progress-badge #placed-count { color: var(--accent); font-size: 1.3rem; }

/* =========================================================
   KEYBOARD BOARD
   ========================================================= */
#main {
    position: fixed; inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
    pointer-events: none;
}

.keyboard-base-outer {
    pointer-events: all;
    background-color: var(--board-bg);
    border: 3px solid var(--board-border);
    border-radius: 2rem;
    padding: 12px 20px;
    box-shadow: 0 8px 35px rgba(0,0,0,0.11), 0 2px 8px rgba(0,0,0,0.05);
    transition: background-color 0.5s, border-color 0.5s, box-shadow 0.5s;
}

.keyboard-inner {
    background: rgba(255,255,255,0.32);
    border-radius: 14px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

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

/* Base key */
.key-cap {
    background: var(--key-bg);
    border: 2px solid var(--board-border);
    box-shadow: 0 4px 0 var(--accent-shadow);
    border-radius: 8px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    flex-shrink: 0;
    transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
}

/* Functional keys (Tab, Shift, etc.) */
.key-cap.func-key {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-sub);
    background: #f8fafc;
    border-color: #cbd5e1;
    box-shadow: 0 4px 0 #94a3b8;
}

/* Key label positioning */
.key-label-top {
    font-size: 0.62rem;
    color: var(--text-sub);
    position: absolute; top: 3px; left: 5px;
    line-height: 1;
}
.key-label-bottom {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--accent);
    position: absolute; bottom: 3px; right: 5px;
    line-height: 1;
}

/* =========================================================
   EMPTY SLOT
   ========================================================= */
.key-slot {
    background: transparent;
    border: 2.5px dashed rgba(0,0,0,0.16);
    box-shadow: none;
    position: relative;
}

/* Easy — always visible ghost hint */
body.diff-easy .key-slot::before {
    content: attr(data-hint-bottom);
    position: absolute; bottom: 3px; right: 5px;
    font-size: 1.05rem; font-weight: 700;
    color: rgba(0,0,0,0.09); line-height: 1;
}
body.diff-easy .key-slot::after {
    content: attr(data-hint-top);
    position: absolute; top: 3px; left: 5px;
    font-size: 0.62rem; color: rgba(0,0,0,0.07); line-height: 1;
}

/* Medium — hint appears only on drag-over */
body.diff-medium .key-slot::before {
    content: attr(data-hint-bottom);
    position: absolute; bottom: 3px; right: 5px;
    font-size: 1.05rem; font-weight: 700;
    color: rgba(0,0,0,0); line-height: 1;
    transition: color 0.2s;
}
body.diff-medium .key-slot::after {
    content: attr(data-hint-top);
    position: absolute; top: 3px; left: 5px;
    font-size: 0.62rem; color: rgba(0,0,0,0); line-height: 1;
    transition: color 0.2s;
}
body.diff-medium .key-slot.drag-over::before { color: rgba(0,0,0,0.22); }
body.diff-medium .key-slot.drag-over::after  { color: rgba(0,0,0,0.13); }

/* Hard — no hints */
body.diff-hard .key-slot::before,
body.diff-hard .key-slot::after { content: none; }

/* Drag-over highlight */
.key-slot.drag-over {
    background: rgba(8,145,178,0.1);
    border-style: solid;
    border-color: var(--accent);
    transform: scale(1.07);
    box-shadow: 0 0 0 3px rgba(8,145,178,0.2);
}

/* Placement animations */
.key-slot.correct-anim {
    animation: correctPop 0.45s cubic-bezier(0.175,0.885,0.32,1.275) forwards;
}
@keyframes correctPop {
    0%   { transform: scale(1.28); background: #bbf7d0; border-color: #4ade80; box-shadow: 0 4px 0 #22c55e; }
    60%  { transform: scale(1.05); }
    100% { transform: scale(1); background: var(--key-bg); border-color: var(--board-border); box-shadow: 0 4px 0 var(--accent-shadow); }
}
.key-slot.wrong-anim {
    animation: wrongShake 0.38s ease;
}
@keyframes wrongShake {
    0%,100% { transform: translateX(0); }
    20%  { transform: translateX(-6px); background: #fee2e2; border-color: #fca5a5; }
    40%  { transform: translateX(6px); }
    60%  { transform: translateX(-4px); }
    80%  { transform: translateX(3px); }
}

/* =========================================================
   PUZZLE PIECES
   ========================================================= */
#pieces-layer {
    position: fixed; inset: 0;
    pointer-events: none;
    z-index: 20;
}

.puzzle-piece {
    position: absolute;
    pointer-events: all;
    width: 52px; height: 52px;
    background: var(--key-bg);
    border: 2.5px solid var(--accent);
    box-shadow: 0 5px 0 var(--accent-shadow), 0 8px 20px rgba(0,0,0,0.13);
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: grab;
    touch-action: none;
    z-index: 25;
    transition: transform 0.12s, box-shadow 0.12s;
}
.puzzle-piece:hover {
    transform: translateY(-3px) rotate(-2deg) scale(1.08);
    box-shadow: 0 8px 0 var(--accent-shadow), 0 12px 25px rgba(0,0,0,0.18);
}
.puzzle-piece.dragging {
    cursor: grabbing;
    transform: scale(1.13) rotate(3deg) !important;
    box-shadow: 0 14px 35px rgba(0,0,0,0.28) !important;
    z-index: 1000;
    transition: none;
}
.puzzle-piece.snap-back {
    transition: left 0.35s cubic-bezier(0.175,0.885,0.32,1.275),
                top  0.35s cubic-bezier(0.175,0.885,0.32,1.275),
                transform 0.35s ease;
}

.piece-top {
    font-size: 0.58rem; color: var(--text-sub);
    line-height: 1;
    align-self: flex-start;
    margin-left: 5px; margin-top: 3px;
}
.piece-bottom {
    font-size: 1.1rem; font-weight: 700; color: var(--accent);
    line-height: 1;
    align-self: flex-end;
    margin-right: 5px; margin-bottom: 3px;
}

/* =========================================================
   HINT PILL (bottom)
   ========================================================= */
.hint-pill {
    position: fixed;
    bottom: 20px; left: 50%;
    transform: translateX(-50%);
    background: rgba(255,255,255,0.88);
    border-radius: 50px;
    padding: 8px 20px;
    font-size: 0.92rem; font-weight: 600;
    color: var(--text-muted);
    z-index: 30;
    border: 2px solid rgba(255,255,255,0.95);
    box-shadow: 0 4px 15px rgba(0,0,0,0.07);
    display: flex; gap: 8px; align-items: center;
    white-space: nowrap;
}
.hint-pill i { color: var(--accent); }

/* =========================================================
   DIFFICULTY SCREEN
   ========================================================= */
#diff-screen {
    position: fixed; inset: 0;
    display: flex; align-items: center; justify-content: center;
    z-index: 300;
    transition: opacity 0.3s ease;
}
#diff-screen.hide {
    opacity: 0; pointer-events: none;
}

.diff-card {
    background: white;
    border-radius: 2rem;
    padding: 36px 40px;
    text-align: center;
    box-shadow: 0 25px 70px rgba(0,0,0,0.15);
    border: 3px solid rgba(255,255,255,0.95);
    max-width: 500px; width: 92%;
    animation: modalPop 0.4s cubic-bezier(0.175,0.885,0.32,1.275) forwards;
}
@keyframes modalPop {
    from { opacity: 0; transform: scale(0.88) translateY(16px); }
    to   { opacity: 1; transform: scale(1)    translateY(0); }
}

.diff-icon-header {
    width: 60px; height: 60px;
    background: linear-gradient(135deg, #e0f2fe, #bae6fd);
    border-radius: 18px;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 16px;
    font-size: 1.6rem; color: #0891b2;
}
.diff-title { font-size: 1.9rem; font-weight: 700; color: var(--text-main); margin-bottom: 5px; }
.diff-sub   { font-size: 0.95rem; color: var(--text-sub); margin-bottom: 28px; }

.diff-options { display: flex; flex-direction: column; gap: 12px; }

.diff-btn {
    border: 2.5px solid;
    border-radius: 16px;
    padding: 14px 16px;
    cursor: pointer;
    display: flex; align-items: center; gap: 14px;
    background: white;
    text-align: left;
    font-family: 'Fredoka', sans-serif;
    transition: transform 0.15s, box-shadow 0.15s;
}
.diff-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}
.diff-btn:active { transform: translateY(1px); box-shadow: none; }

/* Soft tones aligned to overall palette */
.diff-btn.easy   { border-color: #86efac; background: #f0fdf4; }
.diff-btn.medium { border-color: #fcd34d; background: #fffbeb; }
.diff-btn.hard   { border-color: #fca5a5; background: #fff1f2; }

.diff-btn-icon {
    width: 42px; height: 42px; flex-shrink: 0;
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem;
}
.diff-btn.easy   .diff-btn-icon { background: #dcfce7; color: #16a34a; }
.diff-btn.medium .diff-btn-icon { background: #fef9c3; color: #ca8a04; }
.diff-btn.hard   .diff-btn-icon { background: #ffe4e6; color: #e11d48; }

.diff-text { flex: 1; min-width: 0; }
.diff-name { font-size: 1.2rem; font-weight: 700; color: var(--text-main); }
.diff-desc {
    font-size: 0.84rem; color: var(--text-muted);
    margin-top: 2px; line-height: 1.35;
    white-space: normal;
}

.diff-badge {
    flex-shrink: 0;
    font-size: 0.75rem; font-weight: 700;
    padding: 4px 10px; border-radius: 50px;
    white-space: nowrap;
}
.diff-btn.easy   .diff-badge { background: #dcfce7; color: #15803d; }
.diff-btn.medium .diff-badge { background: #fef9c3; color: #92400e; }
.diff-btn.hard   .diff-badge { background: #ffe4e6; color: #be123c; }

/* =========================================================
   VICTORY MODAL
   ========================================================= */
#victory {
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(6px);
    display: flex; align-items: center; justify-content: center;
    z-index: 200;
    opacity: 0; pointer-events: none;
    transition: opacity 0.4s ease;
}
#victory.show { opacity: 1; pointer-events: all; }

.victory-card {
    background: white;
    border-radius: 2.5rem;
    padding: 44px 52px;
    text-align: center;
    box-shadow: 0 30px 80px rgba(0,0,0,0.22);
    border: 3px solid #fde68a;
    max-width: 420px; width: 90%;
    transform: scale(0.88);
    transition: transform 0.5s cubic-bezier(0.175,0.885,0.32,1.275);
}
#victory.show .victory-card { transform: scale(1); }

.victory-trophy {
    width: 80px; height: 80px;
    background: linear-gradient(135deg, #fef9c3, #fde68a);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 16px;
    font-size: 2.2rem; color: #b45309;
    animation: bouncePop 0.7s cubic-bezier(0.175,0.885,0.32,1.275) 0.2s both;
}
@keyframes bouncePop {
    from { transform: scale(0) rotate(-90deg); }
    80%  { transform: scale(1.15) rotate(8deg); }
    to   { transform: scale(1) rotate(0); }
}

.victory-title { font-size: 2.4rem; font-weight: 700; color: var(--text-main); margin-bottom: 6px; }
.victory-sub   { font-size: 1.1rem; color: var(--text-muted); margin-bottom: 24px; line-height: 1.45; }

/* Stars row */
.stars {
    display: flex; justify-content: center; gap: 10px;
    margin-bottom: 28px;
}
.star-icon {
    font-size: 2rem;
    color: #e2e8f0; /* default: empty */
    transition: color 0.2s, transform 0.3s;
}
.star-icon.lit {
    color: #fbbf24;
    animation: starPop 0.4s cubic-bezier(0.175,0.885,0.32,1.275) both;
}
@keyframes starPop {
    from { transform: scale(0) rotate(-30deg); }
    80%  { transform: scale(1.25) rotate(5deg); }
    to   { transform: scale(1) rotate(0); }
}

.play-again-btn {
    background: var(--accent);
    color: white;
    border: none;
    border-bottom: 4px solid var(--accent-shadow);
    border-radius: 50px;
    padding: 13px 38px;
    font-family: 'Fredoka', sans-serif;
    font-size: 1.25rem; font-weight: 700;
    cursor: pointer;
    transition: transform 0.15s, border-bottom-width 0.1s;
    display: inline-flex; align-items: center; gap: 8px;
}
.play-again-btn:hover  { transform: translateY(-2px); }
.play-again-btn:active { transform: translateY(3px); border-bottom-width: 1px; }

/* =========================================================
   CONFETTI CANVAS
   ========================================================= */
#confetti-canvas {
    position: fixed; inset: 0;
    pointer-events: none;
    z-index: 150;
}

/* =========================================================
   UTILITIES
   ========================================================= */
.shake { animation: shake 0.38s ease; }
@keyframes shake {
    10%,90% { transform: translateX(-3px); }
    20%,80% { transform: translateX(5px); }
    30%,50%,70% { transform: translateX(-7px); }
    40%,60% { transform: translateX(7px); }
}