/* ============================================================
   lelongX -- Layout
   Container, grid, glass nav, footer, sections, breakpoints
   ============================================================ */

/* ----------- CONTAINER ----------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-gutter);
}

.container-wide {
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: 0 var(--container-gutter);
}

.container-narrow {
    max-width: 820px;
    margin: 0 auto;
    padding: 0 var(--container-gutter);
}

/* ----------- 12-COL GRID ----------- */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }
.grid-12 { grid-template-columns: repeat(12, 1fr); }

.grid-auto-sm { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.grid-auto-md { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.grid-auto-lg { grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); }

.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ----------- FLEX HELPERS ----------- */
.flex          { display: flex; }
.flex-col      { display: flex; flex-direction: column; }
.flex-center   { display: flex; align-items: center; justify-content: center; }
.flex-between  { display: flex; align-items: center; justify-content: space-between; }
.flex-start    { display: flex; align-items: center; justify-content: flex-start; }
.flex-end      { display: flex; align-items: center; justify-content: flex-end; }
.flex-wrap     { flex-wrap: wrap; }
.flex-1        { flex: 1; }

.items-center  { align-items: center; }
.items-start   { align-items: flex-start; }
.items-end     { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

/* ----------- SECTION SPACING ----------- */
.section {
    padding: var(--space-16) 0;
    position: relative;
}

.section-sm { padding: var(--space-12) 0; }
.section-lg { padding: var(--space-24) 0; }
.section-xl { padding: var(--space-32) 0; }

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto var(--space-12);
}

.section-header h2 { margin-bottom: var(--space-4); }
.section-header p  { color: var(--text-secondary); font-size: var(--text-lg); }

/* ----------- GLASS NAV (sticky top) ----------- */
.nav {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    height: var(--nav-height);
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-soft);
}

.nav-container {
    height: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-gutter);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-8);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-2xl);
    font-weight: 800;
    letter-spacing: var(--tracking-tight);
    color: var(--text-primary);
}

.nav-brand .brand-lelong { color: var(--brand-cyan); }
.nav-brand .brand-x      { color: var(--brand-purple); }
.nav-brand .brand-tld    { color: var(--text-muted); font-size: var(--text-md); font-weight: 600; }

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: var(--text-sm);
    transition: color var(--duration-fast) var(--ease-out);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -22px;
    height: 2px;
    background: var(--gradient-hero);
    border-radius: var(--radius-full);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* ----------- FOOTER ----------- */
.footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-soft);
    padding: var(--space-16) 0 var(--space-8);
    margin-top: var(--space-24);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-12);
}

.footer-col h5 {
    color: var(--text-primary);
    font-size: var(--text-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: var(--tracking-widest);
    margin-bottom: var(--space-4);
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-col a {
    color: var(--text-muted);
    font-size: var(--text-sm);
    transition: color var(--duration-fast) var(--ease-out);
}

.footer-col a:hover { color: var(--brand-cyan); }

.footer-brand-block { max-width: 320px; }
.footer-brand-block p {
    color: var(--text-muted);
    font-size: var(--text-sm);
    margin-top: var(--space-3);
}

.footer-social {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.footer-social a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-elevated);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    transition: all var(--duration-normal) var(--ease-out);
}

.footer-social a:hover {
    background: var(--brand-cyan);
    color: var(--text-inverse);
    border-color: var(--brand-cyan);
    transform: translateY(-2px);
}

.footer-bottom {
    border-top: 1px solid var(--border-soft);
    padding-top: var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: var(--text-sm);
}

/* ----------- HERO LAYOUT ----------- */
.hero {
    position: relative;
    padding: var(--space-24) 0 var(--space-16);
    overflow: hidden;
}

.hero-content {
    max-width: 880px;
    text-align: center;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(var(--text-5xl), 6vw, var(--text-7xl));
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tightest);
    margin-bottom: var(--space-6);
}

.hero-subtitle {
    font-size: var(--text-xl);
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto var(--space-8);
    line-height: var(--leading-snug);
}

.hero-ctas {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* ----------- ADMIN SHELL LAYOUT ----------- */
.admin-shell {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: 100vh;
}

.admin-shell.sidebar-collapsed {
    grid-template-columns: var(--sidebar-collapsed) 1fr;
}

.admin-main {
    padding: var(--space-8);
    max-width: 1600px;
    width: 100%;
}

.admin-page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-8);
}

.admin-page-header h1 {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-1);
}

.admin-page-header .subtitle {
    color: var(--text-muted);
    font-size: var(--text-sm);
}

/* ----------- ACCOUNT SHELL (member dashboard) ----------- */
.account-shell {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: var(--space-8);
    padding: var(--space-8) 0;
}

/* ----------- LESSON PLAYER LAYOUT ----------- */
.lesson-shell {
    display: grid;
    grid-template-columns: 280px 1fr 320px;
    min-height: calc(100vh - var(--nav-height));
}

.lesson-shell.notes-collapsed {
    grid-template-columns: 280px 1fr 0;
}

/* ----------- BREAKPOINTS ----------- */

/* >1440 wider gutter */
@media (min-width: 1440px) {
    :root { --container-gutter: 32px; }
}

/* <=1280 standard */

/* <=1024 collapse some 4-col -> 2-col */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-6 { grid-template-columns: repeat(3, 1fr); }

    .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
    .footer-brand-block { grid-column: 1 / -1; max-width: 100%; }

    .lesson-shell { grid-template-columns: 240px 1fr; }
    .lesson-shell.notes-collapsed { grid-template-columns: 240px 1fr; }
}

/* <=768 tablet -> single col most */
@media (max-width: 768px) {
    .grid-3 { grid-template-columns: 1fr; }
    .grid-4 { grid-template-columns: 1fr; }
    .grid-6 { grid-template-columns: repeat(2, 1fr); }

    .nav-links { display: none; }

    .footer-grid { grid-template-columns: 1fr 1fr; }

    .admin-shell {
        grid-template-columns: 1fr;
    }
    .account-shell {
        grid-template-columns: 1fr;
    }
    .lesson-shell {
        grid-template-columns: 1fr;
    }

    .hero h1 { font-size: var(--text-4xl); }
    .hero-subtitle { font-size: var(--text-md); }
}

/* <=480 phone */
@media (max-width: 480px) {
    .grid-2 { grid-template-columns: 1fr; }
    .grid-6 { grid-template-columns: 1fr; }

    .footer-grid { grid-template-columns: 1fr; }
}