/*
 * css/style.css
 * Custom styles for PageTurner Bookstore — built on Bootstrap 5.3
 */

/* ── Design Tokens ───────────────────────────────────────────── */
:root {
    --pt-primary:   #6B2D8B;  /* deep purple — bookstore brand */
    --pt-accent:    #E8A838;  /* warm amber  — CTA / price highlights */
    --pt-dark:      #1A1A2E;  /* near-black  — nav / footer */
    --pt-light:     #F8F5F2;  /* warm off-white — body background */
    --pt-card-bg:   #FFFFFF;
    --pt-radius:    0.5rem;
    --pt-shadow:    0 2px 12px rgba(0, 0, 0, 0.08);
    --pt-shadow-lg: 0 6px 24px rgba(0, 0, 0, 0.14);
}

body {
    background-color: var(--pt-light);
    color: #2d2d2d;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
}

.navbar {
    background-color: var(--pt-dark) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.navbar-brand {
    font-size: 1.4rem;
    letter-spacing: 0.03em;
    color: var(--pt-accent) !important;
}

.navbar-brand:hover {
    color: #fff !important;
}

.nav-link {
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--pt-accent) !important;
}

/* ── Hero Banner ─────────────────────────────────────────────── */
.hero-banner {
    background: linear-gradient(135deg, var(--pt-primary) 0%, var(--pt-dark) 100%);
    padding: 4rem 1rem;
    margin-bottom: 1rem;
}

.hero-banner h1 {
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--pt-primary);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--pt-accent);
    border-radius: 2px;
    margin: 0.4rem auto 0;
}

.form-select:focus {
    border-color: var(--pt-primary);
    box-shadow: 0 0 0 0.25rem rgba(107, 45, 139, 0.2);
}

/* ── Book Cards ──────────────────────────────────────────────── */
.book-card {
    border: none;
    border-radius: var(--pt-radius);
    box-shadow: var(--pt-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    background: var(--pt-card-bg);
    overflow: hidden;
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--pt-shadow-lg);
}

.book-cover {
    width: 100%;
    height: 220px;
    object-fit: cover;
    object-position: top;
    border-bottom: 1px solid #eee;
}

.book-card .card-title {
    font-size: 0.95rem;
    line-height: 1.3;
    display: -webkit-box; /* clamp to 2 lines with ellipsis */
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-card .card-text {
    font-size: 0.82rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.price {
    color: #2e7d32;
    font-size: 1.1rem !important;
}

.btn-primary {
    background-color: var(--pt-primary);
    border-color: var(--pt-primary);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: #581f77;
    border-color: #581f77;
}

.btn-warning {
    background-color: var(--pt-accent);
    border-color: var(--pt-accent);
    color: #1a1a2e;
    font-weight: 600;
}

.btn-warning:hover {
    background-color: #d4922a;
    border-color: #d4922a;
    color: #1a1a2e;
}

.card {
    border: none;
    border-radius: var(--pt-radius);
    box-shadow: var(--pt-shadow-lg);
}

.card-header {
    border-radius: var(--pt-radius) var(--pt-radius) 0 0 !important;
}

/* Focus ring matches brand colour */
.form-control:focus {
    border-color: var(--pt-primary);
    box-shadow: 0 0 0 0.25rem rgba(107, 45, 139, 0.2);
}

/* Live-validation feedback colours (applied by React) */
.is-valid {
    border-color: #2e7d32 !important;
}
.is-invalid {
    border-color: #c62828 !important;
}
.valid-feedback {
    color: #2e7d32;
}
.invalid-feedback {
    color: #c62828;
}

footer {
    background-color: var(--pt-dark) !important;
}

/* Boost text-muted contrast on dark footer background */
footer .text-muted {
    color: rgba(255, 255, 255, 0.65) !important;
}

footer a {
    transition: color 0.2s;
}

footer a:hover {
    color: var(--pt-accent) !important;
}

/* ── Order confirmation banner ───────────────────────────────── */
.alert.fixed-bottom {
    max-width: 480px;
    margin: 0 auto 1rem;
    left: 50%;
    transform: translateX(-50%);
    right: auto;
    box-shadow: var(--pt-shadow-lg);
    border-radius: var(--pt-radius);
}

@media (max-width: 576px) {
    .hero-banner {
        padding: 2.5rem 1rem;
        clip-path: none;
    }

    .hero-banner h1 {
        font-size: 1.8rem;
    }

    .book-cover {
        height: 180px;
    }

    .section-title {
        font-size: 1.4rem;
    }
}

@media (max-width: 768px) {
    .book-cover {
        height: 200px;
    }
}

/* ── Accessibility ────────────────────────────────────────────── */
:focus-visible {
    outline: 3px solid var(--pt-accent);
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--pt-primary);
    color: white;
    padding: 0.5rem 1rem;
    z-index: 9999;
    border-radius: 0 0 var(--pt-radius) 0;
}

.skip-link:focus {
    top: 0;
}

#loading-spinner {
    padding: 2rem 0;
}

#browse-prompt {
    color: #9e9e9e;
}

#browse-prompt .bi {
    opacity: 0.4;
}