/* =========================================================
   Element Book Club — steipete.me-inspired minimal design
   with Material UI card accents.
   Teal (#00897B) as primary accent, system fonts, dark mode.
   ========================================================= */

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

/* ----- Design tokens ----- */
/* ETC brand colors: Blue #13294B | Cream #e6e1db */
:root {
    --bg:           #13294B;   /* ETC Blue */
    --bg-subtle:    #1a3358;
    --text:         #e6e1db;   /* ETC Cream */
    --text-muted:   #a8a49f;
    --accent:       #e6e1db;   /* Cream as primary accent on navy */
    --accent-dim:   #cec9c3;
    --accent-light: rgba(230,225,219,0.1);
    --border:       rgba(230,225,219,0.15);
    --tag-bg:       rgba(230,225,219,0.08);
    --cream:        #e6e1db;   /* ETC Cream */
    --blue:         #13294B;   /* ETC Blue */
    --card-shadow:  0 2px 4px rgba(0,0,0,0.2), 0 4px 12px rgba(0,0,0,0.15);
    --card-shadow-hover: 0 4px 8px rgba(0,0,0,0.3), 0 8px 24px rgba(0,0,0,0.2);

    --max-width:    768px;
    --pad:          1.5rem;
    --radius:       12px;

    --title: "Bebas Neue", "Impact", "Arial Narrow", sans-serif;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --mono: "SF Mono", "Cascadia Code", "Fira Code", "Consolas", monospace;
}

/* ----- Base ----- */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent);
    text-decoration: none;
}
a:hover { text-decoration: underline; }

/* =========================================================
   Layout
   ========================================================= */

.site-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container,
.nav-inner,
.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--pad);
    width: 100%;
}

.main-content {
    flex: 1;
    padding: 0 0 5rem;
}

/* =========================================================
   Navigation
   ========================================================= */

.nav {
    border-bottom: 1px solid var(--border);
    padding: 1.1rem 0;
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 10;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    text-decoration: none;
    display: flex;
    align-items: center;
}
.nav-logo:hover { text-decoration: none; }
.nav-logo:hover .nav-logo-lockup { opacity: 0.85; }

.nav-logo-lockup {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.6rem;
    line-height: 1;
    transition: opacity 0.15s;
}

/* Crop the logo image to show only the "Element" wordmark (top ~58%) */
.nav-logo-element-wrap {
    height: 22px;
    overflow: hidden;
}

.nav-logo-element {
    height: 38px;
    width: auto;
    display: block;
}

/* "Book Club" text next to the Element wordmark */
.nav-logo-bookclub {
    font-family: var(--title);
    font-weight: 400;
    font-size: 1.35rem;
    color: var(--cream);
    letter-spacing: 0.05em;
}

.nav-links {
    display: flex;
    gap: 1.75rem;
    list-style: none;
}

.nav-link {
    font-size: 0.88rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.15s;
}
.nav-link:hover { color: var(--text); text-decoration: none; }
.nav-link.active { color: var(--text); font-weight: 500; }

/* =========================================================
   Hero
   ========================================================= */

.hero {
    padding: 3.5rem 0 2rem;
}

.hero h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.035em;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero-accent { color: var(--accent); }

.hero p {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 540px;
    line-height: 1.7;
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 540px;
    line-height: 1.7;
    margin-bottom: 0.5rem !important;
}

.hero-asterisk {
    color: var(--accent);
    font-size: 0.85em;
    vertical-align: super;
}

.hero-fine-print {
    font-size: 0.65rem !important;
    color: var(--text-muted);
    max-width: 420px;
    line-height: 1.5;
    opacity: 0.6;
}

/* =========================================================
   Sections
   ========================================================= */

.section { margin-top: 3.5rem; }

.section-header {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid var(--border);
}

.section-title {
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.section-link {
    margin-left: auto;
    font-size: 0.85rem;
    color: var(--accent);
}

/* =========================================================
   Material UI Cards
   ========================================================= */

.material-card {
    background: var(--bg-subtle);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0;
    overflow: hidden;
    transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
    box-shadow: var(--card-shadow);
    margin-bottom: 1.75rem;
}

.card-location {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.6rem;
    display: flex;
    align-items: center;
    gap: 0.15rem;
}

.material-card:hover {
    box-shadow: var(--card-shadow-hover);
    transform: translateY(-2px);
    border-color: var(--accent);
}

.card-media {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
    background: var(--accent-light);
}

.card-body {
    padding: 1.25rem;
}

.card-overline {
    font-family: var(--mono);
    font-size: 0.68rem;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 0.35rem;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.25rem;
    line-height: 1.3;
}

.card-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.card-text {
    font-size: 0.84rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 1rem;
    /* Clamp to 3 lines */
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-actions {
    display: flex;
    gap: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}

/* Material-style buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-family: var(--sans);
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.45rem 1rem;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.15s ease;
    cursor: pointer;
    border: none;
    letter-spacing: 0.02em;
}

.btn .material-symbols-outlined {
    font-size: 1rem;
}

.btn-primary {
    background: var(--cream);
    color: var(--blue);
}
.btn-primary:hover {
    background: var(--accent-dim);
    text-decoration: none;
    box-shadow: 0 2px 8px rgba(230,225,219,0.2);
}

.btn-outline {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
}
.btn-outline:hover {
    background: var(--accent-light);
    text-decoration: none;
}

.btn-text {
    background: transparent;
    color: var(--accent);
    padding: 0.45rem 0.5rem;
}
.btn-text:hover {
    background: var(--accent-light);
    text-decoration: none;
    border-radius: 8px;
}

/* =========================================================
   Book Cards Grid
   ========================================================= */

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

/* Featured / current read card - full width */
.featured-card {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 0;
    border-radius: var(--radius);
    overflow: hidden;
}

.featured-card .card-media {
    height: 100%;
    min-height: 280px;
    width: 180px;
}

.featured-card .card-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

.event-card-media {
    background: var(--navy-mid, #1a3561);
    display: flex;
    align-items: center;
    justify-content: center;
}

.event-card-icon {
    font-size: 4rem;
    color: var(--cream);
    opacity: 0.7;
}

.featured-card .card-text {
    -webkit-line-clamp: 4;
    flex: 1;
}

.featured-card .card-actions {
    margin-top: auto;
}

/* Badge for current read */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-family: var(--mono);
    font-size: 0.68rem;
    padding: 0.2rem 0.65rem;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    width: fit-content;
    margin-bottom: 0.5rem;
}

.badge-active {
    background: var(--cream);
    color: var(--blue);
}

.badge-upcoming {
    background: var(--tag-bg);
    color: var(--text-muted);
}

.badge .material-symbols-outlined {
    font-size: 0.85rem;
}

/* =========================================================
   How It Works / Info Cards
   ========================================================= */

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.info-card {
    background: var(--bg-subtle);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-align: center;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.info-card:hover {
    border-color: var(--accent);
    box-shadow: var(--card-shadow);
}

.info-icon {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
    display: block;
}

.info-card h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
}

.info-card p {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* =========================================================
   About page
   ========================================================= */

.about-page { padding: 3rem 0; }
.about-page h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}
.about-page p {
    color: var(--text-muted);
    margin-bottom: 1rem;
    line-height: 1.75;
    max-width: 540px;
}
.about-page a { color: var(--accent); }

/* =========================================================
   Schedule page
   ========================================================= */

.schedule-page { padding: 3rem 0; }

.schedule-page-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.4rem;
}

.schedule-page-subtitle {
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    font-size: 0.95rem;
}

.timeline {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    border-left: 2px solid var(--border);
    padding-left: 1.5rem;
    margin-left: 0.5rem;
}

.timeline-item {
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -1.85rem;
    top: 0.5rem;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border);
    border: 2px solid var(--bg);
}

.timeline-item.active::before {
    background: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.timeline-month {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.35rem;
}

.timeline-book {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.15rem;
}

.timeline-author {
    font-size: 0.84rem;
    color: var(--text-muted);
}

/* =========================================================
   Footer
   ========================================================= */

.footer {
    border-top: 1px solid var(--border);
    padding: 1.5rem 0;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* =========================================================
   Utility
   ========================================================= */

.loading {
    text-align: center;
    color: var(--text-muted);
    padding: 4rem;
    font-family: var(--mono);
    font-size: 0.85rem;
}

.home-hub-link {
    margin-top: auto;
    padding-top: 0.75rem;
    font-size: 0.82rem;
    color: var(--cream);
    opacity: 0.7;
    font-family: var(--mono);
}

.home-hub-card {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 640px) {
    .hero h1 { font-size: 1.6rem; }
    .book-grid { grid-template-columns: 1fr; }
    .info-grid { grid-template-columns: 1fr 1fr; }
    .featured-card {
        grid-template-columns: 1fr;
    }
    .featured-card .card-media {
        width: 100%;
        height: 200px;
        min-height: auto;
    }
    .footer-inner { flex-direction: column; gap: 0.4rem; text-align: center; }
    .card-actions { flex-direction: column; }
}