/* ===================================================
   LAYOUT — App shell, sidebar, main, mobile tab bar
   =================================================== */

/* ---- App Container ---- */
.app-container {
    display: flex;
    min-height: 100vh;
    position: relative;
}

/* ================================================
   SIDEBAR — macOS/Apple Settings-style left panel
   ================================================ */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    display: flex;
    flex-direction: column;
    padding: var(--space-32) var(--space-16) var(--space-24);
    z-index: 200;
    background: var(--sidebar-bg);
    backdrop-filter: var(--blur-xl);
    -webkit-backdrop-filter: var(--blur-xl);
    border-right: 1px solid var(--glass-border);
    overflow-y: auto;
    overflow-x: hidden;
}

/* ---- Profile Section ---- */
.profile-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--space-8) 0 var(--space-24);
    border-bottom: 1px solid var(--divider);
    margin-bottom: var(--space-20);
}

.profile-pic-wrapper {
    position: relative;
    margin-bottom: var(--space-16);
}

.profile-pic {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid transparent;
    background-clip: padding-box;
    box-shadow:
        0 0 0 2px var(--accent-color),
        var(--shadow-md);
    transition: transform var(--transition-spring), box-shadow var(--transition-smooth);
}

.profile-pic:hover {
    transform: scale(1.06);
    box-shadow:
        0 0 0 2px var(--accent-color),
        var(--accent-glow),
        var(--shadow-lg);
}

.profile-status {
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 14px;
    height: 14px;
    background: var(--sys-green);
    border-radius: 50%;
    border: 2.5px solid var(--bg-main);
}

.profile-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    margin-bottom: var(--space-4);
}

.handle {
    color: var(--accent-color);
    font-size: 0.78rem;
    font-weight: 600;
    font-family: var(--font-mono);
    letter-spacing: 0.02em;
    margin-bottom: var(--space-8);
}

.bio {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.5;
    max-width: 200px;
}

/* ---- Navigation ---- */
.nav-section {
    margin-bottom: var(--space-8);
}

.nav-section-label {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-tertiary);
    padding: var(--space-8) var(--space-12) var(--space-6);
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    flex-grow: 1;
}

/* ---- Sidebar Footer ---- */
.sidebar-footer {
    margin-top: auto;
    padding-top: var(--space-20);
    border-top: 1px solid var(--divider);
    display: flex;
    flex-direction: column;
    gap: var(--space-16);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--space-12);
}

.social-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: var(--bg-pill);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast), transform var(--transition-spring);
}

.social-icon:hover {
    background: var(--bg-pill-hover);
    transform: scale(1.12);
}

.social-icon img {
    width: 18px;
    height: 18px;
    opacity: 0.75;
    transition: opacity var(--transition-fast);
}

.social-icon:hover img { opacity: 1; }

.copyright {
    font-size: 0.68rem;
    color: var(--text-tertiary);
    text-align: center;
    line-height: 1.6;
}

/* ================================================
   MOBILE HEADER BAR — iOS style top bar
   ================================================ */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: var(--sidebar-bg);
    backdrop-filter: var(--blur-xl);
    -webkit-backdrop-filter: var(--blur-xl);
    border-bottom: 1px solid var(--glass-border);
    z-index: 200;
    align-items: center;
    padding: 0 var(--space-16);
    justify-content: space-between;
}

.mobile-logo {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent-color);
    letter-spacing: 0.04em;
}

.mobile-menu-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: var(--bg-pill);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: background var(--transition-fast);
}
.mobile-menu-btn:hover { background: var(--bg-pill-hover); }

/* ================================================
   MOBILE DRAWER OVERLAY
   ================================================ */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 199;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-smooth), visibility var(--transition-smooth);
}
.sidebar-overlay.visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* ================================================
   BOTTOM TAB BAR — iPhone-style
   ================================================ */
.tab-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--tab-bar-height);
    background: var(--tab-bar-bg);
    backdrop-filter: var(--blur-xl);
    -webkit-backdrop-filter: var(--blur-xl);
    border-top: 1px solid var(--glass-border);
    z-index: 200;
    padding-bottom: env(safe-area-inset-bottom, 0);
    padding-bottom: max(env(safe-area-inset-bottom), 8px);
}

.tab-bar-inner {
    display: flex;
    align-items: flex-start;
    justify-content: space-around;
    padding-top: var(--space-8);
}

.tab-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-6) var(--space-16);
    border-radius: var(--radius-lg);
    color: var(--text-tertiary);
    transition: color var(--transition-fast), transform var(--transition-spring);
    min-width: 60px;
}

.tab-btn .tab-icon {
    width: 24px;
    height: 24px;
    transition: transform var(--transition-spring);
}

.tab-btn .tab-label {
    font-size: 0.62rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    transition: color var(--transition-fast);
}

.tab-btn.active {
    color: var(--accent-color);
}

.tab-btn.active .tab-icon {
    transform: scale(1.12);
}

.tab-btn:active {
    transform: scale(0.90);
}

/* ================================================
   MAIN CONTENT AREA
   ================================================ */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: var(--space-40) var(--space-32) var(--space-40);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: calc(1400px + var(--sidebar-width));
}

#app-view {
    flex: 1;
    animation: pageIn 0.35s var(--spring-smooth) both;
}

/* ================================================
   GRID LAYOUTS
   ================================================ */
.grid-layout {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-16);
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-16);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-16);
}

/* Stats row */
.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--space-12);
    margin-bottom: var(--space-32);
}

@keyframes pageIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}