/* =========================
   CrossMath - Estilos
   ========================= */

/* Paleta base (ajustada por JS con los temas) */
:root {
    --bg-color: #020617;
    --panel-bg: #ffffff;
    --accent: #ffb027;
    --accent-soft: rgba(255,176,39,0.16);
    --primary: #fb7185;
    --danger: #dc3545;
    --ok: #22c55e;
    --gray: #6b7280;
    --text-main: #111827;
    --radius-xl: 26px;
    --radius-md: 16px;
    --transition-fast: 0.18s ease;
    --shadow-soft: 0 18px 60px rgba(15,23,42,0.40);
    --shadow-soft-sm: 0 8px 24px rgba(15,23,42,0.20);
    --font-main: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
                 -system-ui, -apple-system, "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    height: 100vh;
    width: 100%;
    font-family: var(--font-main);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    user-select: none;
    -webkit-user-select: none;
    position: relative;
    overflow: hidden;
}

/* Fondo animado galaxia / nubes con movimiento */
body {
    background:
        radial-gradient(circle at 20% 0%, rgba(255,255,255,0.35), transparent 55%),
        radial-gradient(circle at 80% 100%, rgba(255,255,255,0.18), transparent 60%),
        linear-gradient(135deg, #020617, #0f172a, #1f2937);
    background-size: 160% 160%;
    animation: bgDrift 40s ease-in-out infinite alternate;
}

body::before {
    content: "";
    position: fixed;
    inset: -30%;
    pointer-events: none;
    background:
        radial-gradient(circle at 15% 20%, rgba(251,113,133,0.22), transparent 60%),
        radial-gradient(circle at 80% 0%, rgba(129,140,248,0.30), transparent 60%),
        radial-gradient(circle at 10% 90%, rgba(52,211,153,0.26), transparent 55%);
    mix-blend-mode: screen;
    opacity: 0.9;
    animation: nebulaMove 65s linear infinite;
    z-index: -1;
}

body::after {
    content: "";
    position: fixed;
    inset: -20%;
    pointer-events: none;
    background:
        radial-gradient(circle at 30% 40%, rgba(255,255,255,0.25), transparent 55%),
        radial-gradient(circle at 70% 80%, rgba(255,255,255,0.18), transparent 55%);
    opacity: 0.7;
    mix-blend-mode: screen;
    animation: nebulaMoveReverse 80s linear infinite;
    z-index: -1;
}

@keyframes bgDrift {
    0% { background-position: 0% 30%; }
    100% { background-position: 100% 70%; }
}

@keyframes nebulaMove {
    0% { transform: translate3d(-4%, 0, 0) scale(1); }
    50% { transform: translate3d(4%, -4%, 0) scale(1.08); }
    100% { transform: translate3d(-3%, 2%, 0) scale(1.02); }
}
@keyframes nebulaMoveReverse {
    0% { transform: translate3d(3%, -2%, 0) scale(1.03); }
    50% { transform: translate3d(-4%, 3%, 0) scale(1.06); }
    100% { transform: translate3d(2%, -1%, 0) scale(1); }
}

/* Partículas del fondo (estrellas y orbes) */
.bg-particle {
    position: fixed;
    width: 6px;
    height: 6px;
    border-radius: 999px;
    background: rgba(255,255,255,0.95);
    opacity: 0.8;
    pointer-events: none;
    filter: blur(0.5px);
    animation: floatParticle 22s linear infinite;
    z-index: -1;
}
.bg-particle.orb {
    width: 18px;
    height: 18px;
    filter: blur(4px);
    opacity: 0.7;
}

@keyframes floatParticle {
    0% {
        transform: translate3d(0, 110vh, 0) scale(0.7);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    80% {
        opacity: 1;
    }
    100% {
        transform: translate3d(0, -20vh, 0) scale(1.1);
        opacity: 0;
    }
}

/* Shell para centrar el card */
#app-shell {
    width: 100%;
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 1;
}

#app-container {
    width: 100%;
    max-width: 1080px;
    min-height: 540px;
    background: var(--panel-bg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-soft);
    padding: 2.4rem 2.4rem 3.4rem;
    position: relative;
    overflow: hidden;
    text-align: center;
}

/* Todo centrado en el card */
#level-selection-screen,
#game-screen {
    width: 100%;
    max-width: 760px;
    margin: 0 auto;
}

.hidden {
    display: none !important;
}

/* =========================
   Top Actions (temas)
   ========================= */
.top-actions {
    position: absolute;
    top: 18px;
    right: 22px;
    display: flex;
    gap: 10px;
    z-index: 40;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 999px;
    border: none;
    background: #ffffff;
    box-shadow: 0 6px 16px rgba(15,23,42,0.18);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.15rem;
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast),
                background-color var(--transition-fast);
}
.icon-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 26px rgba(15,23,42,0.20);
    background-color: #f5f7ff;
}

/* =========================
   Toasts
   ========================= */
#toast-container {
    position: fixed;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2000;
}
.toast {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    box-shadow: 0 6px 20px rgba(0,0,0,.08);
    padding: 10px 14px;
    margin-bottom: 8px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.92rem;
}
.toast.error {
    border-color: #f8d7da;
    color: #842029;
    background: #f8d7da;
}
.toast.ok {
    border-color: #d1e7dd;
    color: #0f5132;
    background: #d1e7dd;
}

/* =========================
   Level Select
   ========================= */
#level-selection-screen {
    margin-top: 10px;
}

.game-title {
    font-size: clamp(2.8rem, 4vw, 3.4rem);
    margin: 0 0 0.4rem 0;
    font-weight: 900;
    letter-spacing: 0.06em;
    color: #f97316;
    text-shadow:
        0 8px 20px rgba(248,113,113,0.65),
        0 0 20px rgba(251,191,36,0.7);
}
.game-title span {
    display: inline-block;
    transition: transform 0.25s ease, color 0.25s ease;
}
.game-title span:nth-child(odd) {
    transform: translateY(1px);
}
.game-title span:nth-child(even) {
    transform: translateY(-1px);
}
.game-title:hover span {
    transform: translateY(0);
    color: #fb7185;
}

.subtitle {
    margin: 0 0 1.8rem 0;
    font-size: 0.98rem;
    color: #6b7280;
}

.level-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(90px, 1fr));
    gap: 14px;
    justify-content: center;
    margin: 0 auto;
    max-width: 680px;
}

.level-btn {
    padding: 14px 10px 10px;
    border-radius: 18px;
    border: 2px solid #fb7185;
    background: #ffffff;
    color: #fb7185;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    box-shadow: 0 8px 22px rgba(248,113,113,0.25);
    transition: all var(--transition-fast);
}
.level-btn .level-number {
    font-size: 1.4rem;
}
.level-btn .level-label {
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    opacity: 0.8;
}
.level-btn:hover {
    transform: translateY(-3px);
    background: rgba(251,113,133,0.06);
    border-color: #f97316;
    color: #f97316;
    box-shadow: 0 14px 30px rgba(248,113,113,0.45);
}

/* =========================
   Game Screen
   ========================= */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: .9rem;
    padding: 0 4px;
    margin-top: 4px;
}
.header-right {
    display: flex;
    gap: .4rem;
    align-items: center;
}
.level-left {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
}
#level-display {
    font-size: clamp(1.3rem, 2.1vw, 1.7rem);
    color: #374151;
    font-weight: 800;
}
.difficulty-label {
    font-size: 0.78rem;
    font-weight: 600;
    color: #9ca3af;
}

.chip {
    padding: 6px 11px;
    border-radius: 999px;
    background: #ffffff;
    border: 1px solid #e9ecef;
    font-weight: 700;
    font-size: 0.82rem;
    color: #52606d;
    box-shadow: 0 3px 10px rgba(15,23,42,0.08);
}

.timer {
    font-size: 1rem;
    font-weight: 800;
    color: var(--danger);
    background-color: #ffffff;
    padding: 6px 12px;
    border-radius: 999px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.12);
}
.timer.timer-low {
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.06); box-shadow: 0 6px 18px rgba(220,53,69,0.36); }
    100% { transform: scale(1); }
}

/* =========================
   Countdown overlay
   ========================= */
#game-screen {
    position: relative;
}

#countdown-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle, rgba(255,255,255,0.16), transparent);
    z-index: 50;
}

#countdown-circle {
    width: 140px;
    height: 140px;
    border-radius: 999px;
    background: #ffffff;
    box-shadow: 0 12px 30px rgba(15,23,42,0.25);
    display: flex;
    align-items: center;
    justify-content: center;
}

#countdown-number {
    font-size: 3.2rem;
    font-weight: 800;
    color: var(--accent);
}

/* =========================
   Grid
   ========================= */
#crossmath-grid {
    display: grid;
    gap: 7px;
    margin: 0 auto 1rem auto;
    justify-content: center;
}

.grid-cell {
    width: clamp(48px, 6.3vw, 66px);
    height: clamp(48px, 6.3vw, 66px);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 14px;
    font-size: clamp(1.2rem, 2.4vw, 1.7rem);
    transition: all 0.14s ease;
    border: 1px solid #e5e9f0;
    background: #ffffff;
    box-shadow: 0 2px 6px rgba(15,23,42,0.06);
    position: relative;
}

.cell-fixed {
    background: linear-gradient(to bottom, #4b5563, #111827);
    color: white;
    font-weight: 800;
    box-shadow: 0 5px 14px rgba(15,23,42,0.35);
}

.cell-operator {
    background-color: #f5f7fb;
    color: #52606d;
    font-weight: 800;
}

.cell-blank {
    background-color: transparent;
    border: none;
    box-shadow: none;
}

.cell-droppable {
    background: #eef3ff;
    border: 2px dashed #9fb4ff;
}
.cell-droppable.drag-over {
    background-color: #d5e6ff;
    border-color: var(--primary);
}

/* Validación */
.grid-cell.cell-correct {
    background-color: #d4edda !important;
    box-shadow: 0 4px 14px rgba(56,142,60,0.35);
}
.grid-cell.equation-incorrect {
    background-color: #f8d7da !important;
    box-shadow: 0 4px 14px rgba(211,47,47,0.35);
}

/* =========================
   Footer & Palette
   ========================= */
.game-footer {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: .8rem;
    margin-top: .6rem;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    justify-content: center;
}

.btn {
    padding: 10px 16px;
    font-size: 0.9rem;
    font-weight: 700;
    border-radius: 999px;
    border: 2px solid var(--primary);
    background: #ffffff;
    color: var(--primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 12px rgba(248,113,113,0.25);
}
.btn:hover {
    background: var(--primary);
    color: #ffffff;
    transform: translateY(-1px);
}

.btn-danger {
    border-color: var(--danger);
    color: var(--danger);
    box-shadow: 0 4px 12px rgba(220,53,69,0.20);
}
.btn-danger:hover {
    background: var(--danger);
    color: #ffffff;
}

.btn-secondary {
    padding: 12px 16px;
    font-size: 0.95rem;
    font-weight: 700;
    border-radius: 999px;
    border: 2px solid var(--gray);
    background: #ffffff;
    color: var(--gray);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.btn-secondary:hover {
    background: var(--gray);
    color: #ffffff;
}

/* Paleta */
#number-palette-container {
    width: 100%;
    padding: 0.8rem 1rem 1rem;
    background-color: #f4f6fb;
    border-radius: var(--radius-md);
    border: 1px dashed #d0d7e6;
    transition: background-color var(--transition-fast),
                border-color var(--transition-fast);
}
#number-palette-container.drag-over {
    background-color: #dde9ff;
    border-color: var(--primary);
}
#number-palette-container p {
    margin: 0 0 .6rem 0;
    font-weight: 600;
    color: #7b8ba5;
    font-size: 0.85rem;
}
#number-palette {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    min-height: 54px;
}
.number-token {
    width: clamp(40px, 5.5vw, 52px);
    height: clamp(40px, 5.5vw, 52px);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: clamp(1rem, 2.1vw, 1.4rem);
    font-weight: 800;
    background-color: #ffffff;
    color: var(--primary);
    border: 2px solid var(--primary);
    border-radius: 14px;
    cursor: grab;
    transition: all 0.12s ease;
    box-shadow: 0 4px 10px rgba(248,113,113,0.22);
}
.number-token:active {
    cursor: grabbing;
    transform: scale(1.08) translateY(1px);
}
.number-token.selected {
    outline: 3px solid var(--accent);
}

/* Solución al perder */
.number-token.cell-solution {
    background-color: #fff3cd;
    border-color: #ffe08a;
    color: #8a6d1a;
    box-shadow: 0 3px 10px rgba(252,217,128,0.65);
}

/* =========================
   Botón Salir
   ========================= */
.exit-btn {
    position: absolute;
    left: 50%;
    bottom: 18px;
    transform: translateX(-50%);
    padding: 9px 16px;
    border-radius: 999px;
    border: none;
    background: linear-gradient(135deg, #f97316, #fb923c);
    color: #ffffff;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 8px 22px rgba(249,115,22,0.7);
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast),
                filter var(--transition-fast);
    z-index: 30;
}
.exit-btn .exit-icon {
    font-size: 1.15rem;
}
.exit-btn:hover {
    transform: translate(-50%, -2px);
    box-shadow: 0 12px 30px rgba(249,115,22,0.85);
    filter: brightness(1.03);
}
.exit-btn:active {
    transform: translate(-50%, 1px) scale(0.98);
    box-shadow: 0 6px 18px rgba(194,65,12,0.7);
}

/* =========================
   Overlay Celebración
   ========================= */
#celebration-overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 900;
}

.confetti-piece {
    position: absolute;
    width: 8px;
    height: 18px;
    border-radius: 4px;
    opacity: 0;
    transform-origin: center;
    animation: confettiFall 1.9s ease-out forwards;
}

.balloon {
    position: absolute;
    width: 28px;
    height: 36px;
    border-radius: 50% 50% 46% 46%;
    opacity: 0;
    box-shadow: 0 8px 18px rgba(0,0,0,0.25);
    animation: balloonRise 2.6s ease-out forwards;
}
.balloon::after {
    content: "";
    position: absolute;
    bottom: -12px;
    left: 50%;
    width: 2px;
    height: 14px;
    background: rgba(55,65,81,0.85);
    transform: translateX(-50%);
}

@keyframes confettiFall {
    0% {
        transform: translate3d(0,-40px,0) rotateZ(0deg);
        opacity: 0;
    }
    10% { opacity: 1; }
    50% {
        transform: translate3d(20px, 180px,0) rotateZ(180deg);
    }
    100% {
        transform: translate3d(-15px, 320px,0) rotateZ(360deg);
        opacity: 0;
    }
}

@keyframes balloonRise {
    0% {
        transform: translate3d(0, 160px,0) scale(0.8);
        opacity: 0;
    }
    20% {
        opacity: 1;
    }
    80% {
        transform: translate3d(0,-120px,0) scale(1.02);
        opacity: 1;
    }
    100% {
        transform: translate3d(0,-180px,0) scale(1.05);
        opacity: 0;
    }
}

/* =========================
   Modal Fin de Juego
   ========================= */
#modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15,23,42,0.65);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.modal-content {
    background: #ffffff;
    padding: 26px 32px 24px;
    border-radius: 18px;
    text-align: center;
    box-shadow: 0 18px 48px rgba(0,0,0,0.35);
    animation: zoomIn .22s ease-out;
    max-width: 420px;
    width: 90%;
}
@keyframes zoomIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
.modal-content h2 {
    font-size: 2rem;
    margin: 0 0 8px 0;
    color: var(--accent);
}
.modal-content p {
    margin: 0 0 14px 0;
    color: #52606d;
    font-size: 0.96rem;
}
.modal-content button {
    display: block;
    width: 100%;
    padding: 12px;
    font-size: 0.98rem;
    margin-top: 10px;
    border-radius: 999px;
    border: none;
    cursor: pointer;
    font-weight: 700;
    transition: all var(--transition-fast);
}
#modal-action-btn {
    background-color: var(--ok);
    color: #ffffff;
    box-shadow: 0 6px 18px rgba(34,197,94,0.45);
}
#modal-action-btn:hover {
    background-color: #16a34a;
    transform: translateY(-1px);
}
#back-to-menu-btn {
    background-color: var(--gray);
    color: #ffffff;
    box-shadow: 0 6px 18px rgba(107,114,128,0.45);
}
#back-to-menu-btn:hover {
    background-color: #4b5563;
    transform: translateY(-1px);
}

/* =========================
   Modal "Borrar todo"
   ========================= */
#confirm-clear-modal {
    position: absolute;
    inset: 0;
    background: rgba(15,23,42,0.22);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 120px;
    z-index: 600;
}
.confirm-clear-box {
    background: #ffffff;
    padding: 16px 18px 14px;
    border-radius: 18px;
    box-shadow: 0 18px 40px rgba(0,0,0,0.25);
    max-width: 360px;
    width: 90%;
    text-align: center;
    animation: zoomIn .18s ease-out;
}
.confirm-clear-box p {
    margin: 0 0 10px 0;
    font-weight: 600;
    color: #374151;
}
.confirm-actions {
    display: flex;
    gap: 8px;
    justify-content: center;
}

/* =========================
   Responsive
   ========================= */
@media (max-width: 900px) {
    #app-container {
        padding: 1.6rem 1.2rem 3.4rem;
        max-width: 100%;
        min-height: auto;
    }

    .level-grid {
        grid-template-columns: repeat(3, minmax(80px, 1fr));
        gap: 10px;
    }
    #crossmath-grid {
        gap: 5px;
    }
}