/* ==========================================================================
   MEMORAMA ZARZA — Estilos principales
   ========================================================================== */

/* Variables de marca */
:root {
    --color-primary: #7a2682;
    --color-primary-dark: #5a1a5c;
    --color-accent: #c8a450;
    --color-accent-light: #e0c878;
    --color-bg: #f5f5f5;
    --color-white: #ffffff;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-success: #27ae60;
    --color-error: #e74c3c;
    --card-size: 130px;
    --border-radius: 12px;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.15);
    --transition: 0.3s ease;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ==========================================================================
   HEADER
   ========================================================================== */

.header {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    padding: 15px 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    position: relative;
}

.header__logo {
    height: 60px;
    object-fit: contain;
}

/* ==========================================================================
   MAIN CONTAINER
   ========================================================================== */

.main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px 20px;
    background-image: url('../PROPORCIONAL FHD.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
}

.main::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(245, 245, 245, 0.88);
}

/* ==========================================================================
   SECTIONS (Pantallas)
   ========================================================================== */

.section {
    display: none;
    width: 100%;
    max-width: 600px;
    position: relative;
    z-index: 1;
    animation: fadeIn 0.4s ease;
}

.section--active {
    display: block;
}

.section--game {
    max-width: 700px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   CARD PANEL (contenedor genérico de sección)
   ========================================================================== */

.panel {
    background: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 40px;
    text-align: center;
}

.panel__title {
    font-size: 1.6rem;
    color: var(--color-primary);
    margin-bottom: 8px;
    font-weight: 700;
}

.panel__subtitle {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: 25px;
}

/* ==========================================================================
   FORMULARIO DE REGISTRO
   ========================================================================== */

.form-group {
    margin-bottom: 18px;
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 5px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: border-color var(--transition);
    outline: none;
    background-color: #fff;
    color: inherit;
    box-sizing: border-box;
}

.form-group select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23666' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--color-accent);
}

.form-group input.invalid,
.form-group select.invalid {
    border-color: var(--color-error);
}

.form-group .error-msg {
    font-size: 0.78rem;
    color: var(--color-error);
    margin-top: 4px;
    display: none;
}

.form-group input.invalid + .error-msg,
.form-group select.invalid + .error-msg {
    display: block;
}

/* ==========================================================================
   BOTONES
   ========================================================================== */

.btn {
    display: inline-block;
    padding: 14px 40px;
    font-size: 1rem;
    font-weight: 700;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    color: var(--color-primary-dark);
    box-shadow: 0 4px 15px rgba(200, 164, 80, 0.4);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(200, 164, 80, 0.6);
}

.btn--primary:active {
    transform: translateY(0);
}

.btn--primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ==========================================================================
   PANTALLA DE INSTRUCCIONES
   ========================================================================== */

.instructions-list {
    text-align: left;
    margin: 20px 0 30px;
    padding-left: 0;
    list-style: none;
    counter-reset: instruccion;
}

.instructions-list li {
    counter-increment: instruccion;
    padding: 10px 0 10px 45px;
    position: relative;
    font-size: 0.95rem;
    line-height: 1.5;
    border-bottom: 1px solid #eee;
}

.instructions-list li:last-child {
    border-bottom: none;
}

.instructions-list li::before {
    content: counter(instruccion);
    position: absolute;
    left: 0;
    top: 10px;
    width: 30px;
    height: 30px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
}

/* ==========================================================================
   CRONÓMETRO
   ========================================================================== */

.timer {
    background: #7a2682;
    color: white;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 25px;
    border-radius: 50px;
    font-size: 1.8rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(26, 58, 92, 0.3);
}

.timer__icon {
    font-size: 1.4rem;
}

/* ==========================================================================
   TABLERO DE MEMORAMA
   ========================================================================== */

.board {
    display: grid;
    grid-template-columns: repeat(4, var(--card-size));
    grid-template-rows: repeat(4, var(--card-size));
    gap: 12px;
    justify-content: center;
    perspective: 1000px;
}

.card {
    width: var(--card-size);
    height: var(--card-size);
    position: relative;
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform 0.5s ease;
}

.card--flipped {
    transform: rotateY(180deg);
}

.card--matched {
    transform: rotateY(180deg);
    cursor: default;
}

.card--matched .card__front {
    box-shadow: 0 0 15px rgba(39, 174, 96, 0.5);
    border-color: var(--color-success);
}

.card__face {
    position: absolute;
    inset: 0;
    border-radius: 10px;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid #ddd;
    overflow: hidden;
}

.card__back {
    background: none;
    border-color: var(--color-accent);
    padding: 0;
}

.card__back img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 1;
    border-radius: 7px;
}

.card__front {
    background: var(--color-white);
    transform: rotateY(180deg);
}

.card__front img {
    width: 85%;
    height: 85%;
    object-fit: contain;
}

/* Efecto hover en cartas no volteadas */
.card:not(.card--flipped):not(.card--matched):hover {
    transform: scale(1.05);
}

/* ==========================================================================
   PANTALLA DE RESULTADOS
   ========================================================================== */

.result-time {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: 20px 0;
}

.result-message {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: 10px;
}

.checkmark {
    width: 80px;
    height: 80px;
    background: var(--color-success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    animation: popIn 0.5s ease;
}

.checkmark::after {
    content: '✓';
    font-size: 2.5rem;
    color: white;
}

@keyframes popIn {
    0%   { transform: scale(0); }
    70%  { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.footer {
    background: var(--color-primary-dark);
    color: var(--color-white);
    text-align: center;
    padding: 12px;
    font-size: 0.8rem;
    opacity: 0.8;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

@media (max-width: 640px) {
    :root {
        --card-size: 75px;
    }

    .header {
        padding: 10px 15px;
    }

    .header__logo {
        height: 45px;
    }

    .main {
        padding: 20px 15px;
    }

    .panel {
        padding: 25px 20px;
    }

    .panel__title {
        font-size: 1.3rem;
    }

    .board {
        gap: 8px;
    }

    .timer {
        font-size: 1.4rem;
        padding: 8px 18px;
    }

    .result-time {
        font-size: 2.2rem;
    }

    .btn {
        padding: 12px 30px;
        font-size: 0.9rem;
    }

    .card__face {
        border-radius: 6px;
        border-width: 2px;
    }
}

@media (max-width: 400px) {
    :root {
        --card-size: 65px;
    }

    .board {
        gap: 6px;
    }
}

/* ==========================================================================
   LOADING / SPINNER
   ========================================================================== */

.spinner {
    display: none;
    width: 30px;
    height: 30px;
    border: 3px solid #ddd;
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 15px auto 0;
}

.spinner--visible {
    display: block;
}

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