/* ═══════════════════════════════════════════════════════════
   LAYOUT.CSS — Simplified: top-nav only, no bottom bar
   EduConnect Hub v2.0
═══════════════════════════════════════════════════════════ */

/* ── APP HEADER (slim brand bar) ────────────────────────── */
#app-header {
    position: fixed;
    top: 0;
    left: 240px;
    right: 0;
    height: var(--header-h);
    background: rgba(6, 6, 8, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 18px;
    gap: 10px;
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.header-brand {
    cursor: pointer;
}

.header-brand .title {
    font-size: .95rem;
    font-weight: 700;
    letter-spacing: -.2px;
    background: linear-gradient(135deg, #FFFFFF 0%, #F87171 120%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.header-brand .subtitle {
    font-size: .58rem;
    color: var(--text-muted);
    letter-spacing: .8px;
    text-transform: uppercase;
    margin-top: 2px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.live-badge {
    font-size: .65rem;
    font-weight: 600;
    color: var(--red-light);
    background: var(--red-glow);
    border: 1px solid var(--red-border);
    border-radius: 0px;
    padding: 3px 9px;
}

.login-status-label {
    font-size: .65rem;
    color: var(--text-muted);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0px;
    padding: 3px 9px;
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ── SIDE TAB NAV ─────────────────────────────────────────── */
#top-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 240px;
    background: var(--bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--border);
    border-bottom: none;
    z-index: 1100;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 18px 10px;
    gap: 6px;
    overflow-y: auto;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-top, .sidebar-footer {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sidebar-footer {
    border-top: 1px solid var(--border);
    padding-top: 14px;
    margin-top: 20px;
}

#top-nav::-webkit-scrollbar {
    display: none;
}

#top-nav .t-tab {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--r-md);
    font-size: .85rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    border: 1px solid transparent;
    background: transparent;
    font-family: var(--font);
    position: relative;
    transition: var(--transition);
}

#top-nav .t-tab:hover {
    color: var(--text-2);
    background: var(--surface-2);
}

#top-nav .t-tab.active {
    color: #fff;
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--red-border);
}

#top-nav .t-tab:active {
    transform: scale(0.97);
}

/* ── MAIN CONTENT ───────────────────────────────────────── */
#main-content {
    margin-top: var(--header-h);
    margin-left: 240px;
    padding: 24px;
    padding-bottom: 40px;
    min-height: calc(100vh - var(--header-h));
    transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
    margin-right: 10px;
    z-index: 1001;
}

/* ── MOBILE RESPONSIVENESS ──────────────────────────────── */
@media (max-width: 850px) {
    #app-header {
        left: 0;
    }
    
    #top-nav {
        transform: translateX(-100%);
        box-shadow: 20px 0 50px rgba(0,0,0,0.5);
    }
    
    #main-content {
        margin-left: 0;
        padding: 16px;
    }

    body.nav-open #top-nav {
        transform: translateX(0);
    }

    body.nav-open::after {
        content: '';
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.5);
        backdrop-filter: blur(4px);
        z-index: 1050;
        animation: fadeIn 0.3s ease;
        cursor: pointer;
    }

    .menu-toggle {
        display: flex;
        position: fixed;
        bottom: 24px;
        right: 20px;
        width: 54px;
        height: 54px;
        background: var(--red);
        background: linear-gradient(135deg, var(--red-light), #ff4444);
        color: white;
        border-radius: 50%;
        align-items: center;
        justify-content: center;
        font-size: 1.6rem;
        box-shadow: 0 8px 30px rgba(239, 68, 68, 0.4);
        z-index: 2000;
        border: 2px solid rgba(255,255,255,0.1);
        cursor: pointer;
        padding: 0;
        margin: 0;
        animation: fabPulse 2s infinite;
    }

    @keyframes fabPulse {
        0% { transform: scale(1); box-shadow: 0 8px 30px rgba(239, 68, 68, 0.4); }
        50% { transform: scale(1.05); box-shadow: 0 10px 40px rgba(239, 68, 68, 0.6); }
        100% { transform: scale(1); box-shadow: 0 8px 30px rgba(239, 68, 68, 0.4); }
    }
    
    .mobile-only-header {
        display: flex !important;
    }
}


@media (max-width: 500px) {
    .brand-text-container .subtitle {
        display: none;
    }
    .header-right {
        display: none;
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}


.mobile-only-header {
    display: none !important;
}

/* Light theme text visibility enhancement */
.light-theme {
    text-shadow: 0 1px 1px rgba(0,0,0,0.02);
}
.light-theme h1, .light-theme h2, .light-theme .title, .light-theme .subject-name {
    text-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

/* ── LOGIN SCREEN ───────────────────────────────────────── */
#login-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 20px;
}

#login-overlay::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(239, 68, 68, .07) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.login-card {
    background: rgba(25, 25, 25, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0px;
    padding: 34px 30px;
    width: 100%;
    max-width: 390px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.3);
    position: relative;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--red), transparent);
}

.login-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 3px;
    letter-spacing: -.3px;
}

.login-title span {
    color: var(--red-light);
}

.login-subtitle {
    font-size: .68rem;
    color: var(--text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 26px;
}

.login-form .form-row {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-bottom: 13px;
}

.login-form label {
    font-size: .68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .8px;
    color: var(--text-3);
}

.login-form .btn-row {
    display: flex;
    gap: 8px;
    margin-top: 6px;
}

.login-msg {
    font-size: .8rem;
    margin-top: 8px;
    min-height: 18px;
    border-radius: var(--r-sm);
    padding: 0 2px;
}

/* ── MISC LAYOUT ─────────────────────────────────────────── */
.section-label {
    font-size: .64rem;
    font-weight: 700;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 18px 16px 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.section-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
    border-radius: 1px;
}

.post-row {
    display: flex;
    gap: 8px;
    align-items: flex-end;
    flex-wrap: wrap;
    padding: 0 16px;
    margin-bottom: 10px;
}

.post-row textarea,
.post-row input {
    flex: 1;
    min-width: 160px;
}

.post-row .side {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.anon-label {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: .68rem;
    color: var(--text-muted);
    cursor: pointer;
    font-weight: 500;
}

.filter-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    padding: 4px 0;
}

.filter-label {
    font-size: .65rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.cat-row {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 10px;
    align-items: center;
}

.form-field-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.form-field-row label {
    font-size: .65rem;
    font-weight: 600;
    color: var(--text-3);
    width: 68px;
    flex-shrink: 0;
    text-transform: uppercase;
    letter-spacing: .5px;
}

.tab-row {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 10px 0 4px;
}

/* ── MOBILE GLOBAL ADJUSTMENTS ────────────────────────── */
@media (max-width: 650px) {
    /* Stack grid columns on small devices */
    [style*="grid-template-columns: repeat(3"],
    [style*="grid-template-columns: repeat(2"],
    [style*="grid-template-columns: 1fr 1fr"],
    [style*="grid-template-columns:1fr 1fr"] {
        grid-template-columns: 1fr !important;
    }
    
    /* Horizontal scrolling for tabs on mobile */
    .tab-row {
        overflow-x: auto;
        white-space: nowrap;
        flex-wrap: nowrap !important;
        padding-bottom: 5px;
        -webkit-overflow-scrolling: touch;
    }
    .tab-row::-webkit-scrollbar {
        display: none;
    }
}

input[type="checkbox"] {
    accent-color: var(--red);
}