/* assets/style.css - Modern, sleek, responsive training resources site */
:root {
    --accent-blue: #2563eb;
    --accent-blue-light: #3b82f6;
    --accent-blue-soft: rgba(37, 100, 235, 0.04);
    --accent-blue-bg: #eff6ff;
    --background: #f8fafc;
    --foreground: #1e293b;
    --card-bg: #fff;
    --card-shadow: 0 2px 16px rgba(37, 99, 235, 0.08);
    --border-radius: 1rem;
    --transition: 0.2s cubic-bezier(.4, 0, .2, 1);
}

body {
    margin: 0;
    font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
    background: var(--background);
    color: var(--foreground);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2rem 1.5rem 1.5rem 1.5rem;
    background: var(--card-bg);
    box-shadow: var(--card-shadow);
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo img {
    width: 48px;
    height: 48px;
}

.logo span {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-blue);
    letter-spacing: 1px;
}

nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

nav a {
    text-decoration: none;
    color: var(--accent-blue);
    font-weight: 500;
    font-size: 1.1rem;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: background var(--transition), color var(--transition);
}

nav a:hover {
    background: var(--accent-blue-light);
    color: #fff;
}

.nav-btn {
    background: var(--accent-blue-soft);
    color: var(--accent-blue-light);
    border: none;
    border-radius: 0.5rem;
    padding: 0.5rem 0.7rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    transition: background var(--transition), color var(--transition);
}

.nav-btn:hover,
.nav-btn:focus {
    background: var(--accent-blue-light);
    color: #fff;
    outline: none;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-blue);
    margin-bottom: 1rem;
    text-align: center;
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
    width: 100%;
    max-width: 1100px;
    margin-top: 2rem;
}

.resource-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    transition: box-shadow var(--transition), transform var(--transition);
    cursor: pointer;
    border: none;
}

.resource-card:hover {
    box-shadow: 0 4px 32px rgba(37, 99, 235, 0.15);
    transform: translateY(-4px) scale(1.02);
}

.resource-card h2 {
    font-size: 1.3rem;
    color: var(--accent-blue);
    margin: 0 0 0.5rem 0;
}

.resource-card p {
    color: var(--foreground);
    opacity: 0.8;
    margin: 0 0 1rem 0;
}

.resource-card a {
    color: var(--accent-blue);
    text-decoration: underline;
    font-weight: 500;
    margin-top: auto;
    transition: color var(--transition);
}

.resource-card a:hover {
    color: var(--accent-blue-light);
}

.qr-popup {
    position: fixed;
    inset: 0;
    background: rgba(30, 41, 59, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: background var(--transition);
}

.qr-popup[hidden] {
    display: none;
}

.qr-popup-content {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 8px 32px rgba(37, 99, 235, 0.18);
    padding: 2rem 2rem 1.5rem 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    min-width: 280px;
    max-width: 90vw;
    max-height: 90vh;
}

.qr-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    font-size: 2rem;
    color: var(--accent-blue);
    cursor: pointer;
    transition: color var(--transition);
    z-index: 1;
}

.qr-close:hover,
.qr-close:focus {
    color: var(--accent-blue-light);
    outline: none;
}

.qr-img {
    max-width: 180px;
    max-height: 180px;
    object-fit: contain;
    margin-bottom: 1.2rem;
    border-radius: 0.5rem;
    box-shadow: 0 2px 12px rgba(37, 99, 235, 0.10);
}

.qr-download {
    color: var(--accent-blue);
    font-weight: 500;
    text-decoration: none;
    margin-top: 0.5rem;
    font-size: 1.1rem;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: background var(--transition), color var(--transition);
}

.qr-download:hover,
.qr-download:focus {
    color: var(--accent-blue-light);
    outline: none;
    background: var(--accent-blue-bg);
}

@media (max-width: 700px) {
    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        padding: 1.5rem 1rem 1rem 1rem;
    }

    .logo span {
        font-size: 1.5rem;
    }

    nav {
        gap: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    .resource-grid {
        gap: 1rem;
        margin-top: 1rem;
    }

    .resource-card {
        padding: 1.2rem 1rem;
    }
}

@media (max-width: 500px) {
    header {
        padding: 1rem 0.5rem 0.5rem 0.5rem;
    }

    .logo img {
        width: 36px;
        height: 36px;
    }

    .logo span {
        font-size: 1.1rem;
    }

    h1 {
        font-size: 1.3rem;
    }

    .resource-card {
        padding: 0.8rem 0.5rem;
    }

    .qr-popup-content {
        padding: 1.7rem 2rem 1rem 2rem;
        min-width: 0;
    }

    .qr-img {
        max-width: 280px;
        max-height: 280px;
    }
}