/* ============================================================
   practice.css — Wisdom Brains Mental Math Practice Tool
   Theme: navy #1e3a8a, orange #f97316 hover
   ============================================================ */

:root {
    --wb-navy: #1e3a8a;
    --wb-orange: #f97316;
    --wb-purple: #764ba2;
    --wb-text: #2c3e50;
    --wb-light: #6c757d;
    --wb-bg: #f8fafc;
    --wb-white: #ffffff;
    --wb-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

/* === Layout === */
main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}

/* === Cards (homepage) === */
.practice-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    max-width: 1100px;
    justify-content: center;
}

.practice-card {
    background: var(--wb-white);
    width: 260px;
    border-radius: 14px;
    padding: 35px 25px;
    text-align: center;
    text-decoration: none;
    color: var(--wb-purple);
    font-weight: 600;
    font-size: 1.2rem;
    box-shadow: var(--wb-shadow);
    transition: all 0.3s ease;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.practice-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.2);
    border-color: #667eea;
}

/* === Form === */
.form-container {
    background: var(--wb-white);
    border-radius: 14px;
    padding: 40px 35px;
    box-shadow: var(--wb-shadow);
    max-width: 450px;
    width: 100%;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.form-container h2 {
    text-align: center;
    color: var(--wb-navy);
    margin-bottom: 25px;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: var(--wb-purple);
}

.form-group input[type="number"] {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid #dce1e8;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input[type="number"]:focus {
    outline: none;
    border-color: var(--wb-navy);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    color: var(--wb-purple);
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--wb-navy);
    cursor: pointer;
}

.btn-go {
    width: 100%;
    padding: 14px;
    background: var(--wb-navy);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--wb-shadow);
}

.btn-go:hover {
    background-color: var(--wb-orange);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(249, 115, 22, 0.3);
}

/* === Modal === */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.modal-box {
    background: var(--wb-white);
    border-radius: 16px;
    width: 90%;
    max-width: 900px;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.modal-header {
    background: var(--wb-navy);
    color: #fff;
    padding: 22px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.modal-close {
    background: none;
    border: none;
    color: #fff;
    font-size: 2.2rem;
    cursor: pointer;
    line-height: 1;
    transition: opacity 0.2s;
}

.modal-close:hover {
    opacity: 0.7;
}

.stopwatch-bar {
    text-align: center;
    padding: 14px;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--wb-navy);
    background: var(--wb-bg);
    border-bottom: 1px solid rgba(30, 58, 138, 0.1);
}

.flash-area {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 350px;
    padding: 50px;
}

.flash-number {
    font-size: 8rem;
    font-weight: 800;
    color: var(--wb-navy);
    transition: opacity 0.15s;
}

.result-area {
    padding: 30px;
    text-align: center;
}

.correct-label {
    font-weight: 600;
    color: var(--wb-light);
    margin-bottom: 4px;
}

.correct-answer {
    font-size: 5rem;
    font-weight: 800;
    color: var(--wb-orange);
}

/* === Responsive === */
@media (max-width: 768px) {
    main {
        padding: 25px 15px;
    }

    .form-container {
        padding: 30px 20px;
    }

    .form-container h2 {
        font-size: 1.3rem;
    }

    .practice-cards {
        gap: 20px;
    }

    .practice-card {
        width: 100%;
        max-width: 260px;
    }

    .flash-number {
        font-size: 5rem;
    }

    .correct-answer {
        font-size: 3.5rem;
    }

    .modal-header {
        padding: 18px 20px;
        font-size: 1.2rem;
    }

    .flash-area {
        min-height: 250px;
        padding: 30px;
    }
}

@media (max-width: 480px) {
    .form-container {
        padding: 25px 15px;
    }

    .flash-number {
        font-size: 3.5rem;
    }

    .correct-answer {
        font-size: 2.5rem;
    }

    .modal-header {
        padding: 15px;
        font-size: 1rem;
    }

    .flash-area {
        min-height: 200px;
        padding: 20px;
    }

    .result-area {
        padding: 20px 15px;
    }

    .btn-go {
        padding: 12px;
        font-size: 1rem;
    }
}


/* === Practice Sub-Navigation === */
.practice-sub-nav {
    display: flex;
    justify-content: center;
    gap: 12px;
    padding: 12px 15px;
    background: #f8fafc;
    border-bottom: 1px solid rgba(30, 58, 138, 0.1);
}

.practice-nav-item {
    padding: 8px 18px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    color: #1e3a8a;
    background: var(--wb-white);
    border: 1px solid rgba(30, 58, 138, 0.15);
    transition: all 0.3s ease;
}

.practice-nav-item:hover {
    background: #f97316;
    color: #fff;
    border-color: #f97316;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
}

.practice-nav-item.active {
    background: #f97316;
    color: #fff;
    border-color: #f97316;
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
}

@media (max-width: 480px) {
    .practice-sub-nav {
        gap: 6px;
        padding: 10px;
    }

    .practice-nav-item {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
}