/**
 * Navigation & Tab Styles
 *
 * - Main navigation tabs
 * - Sub navigation (segmented control)
 * - Tab/discover panels
 * - Hero tab container
 */

/* ============ MAIN NAVIGATION TABS ============ */
.main-nav {
    display: flex;
    gap: var(--space-1);
    padding: 0 var(--space-xl);
    background: #0e1715;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    flex-shrink: 0;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
}

.main-nav-tab {
    padding: var(--space-3) var(--space-5);
    background: transparent;
    border: none;
    color: var(--text-alpha-muted);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.02em;
    transition: color var(--duration-normal), background var(--duration-normal);
    position: relative;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.main-nav-tab:hover {
    color: var(--text-alpha-secondary);
    background: rgba(255, 255, 255, 0.03);
}

.main-nav-tab.active {
    color: var(--text-alpha-primary);
    font-weight: var(--font-weight-bold);
}

.main-nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--space-2);
    right: var(--space-2);
    height: 2px;
    background: var(--accent);
    border-radius: 1px 1px 0 0;
}

/* Sub Navigation (Learn/Discover) — Segmented Control */
.sub-nav {
    display: none;
    padding: var(--space-2) var(--space-xl);
    background: rgba(6, 16, 12, 0.9);
    border-bottom: 1px solid rgba(26, 61, 45, 0.2);
    justify-content: center;
    flex-shrink: 0;
}

.sub-nav.visible {
    display: flex;
}

/* Shared container that groups the segments */
.sub-nav-inner {
    display: flex;
    background: rgba(74, 157, 122, 0.06);
    border: 1px solid rgba(74, 157, 122, 0.15);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.sub-nav-tab {
    position: relative;
    padding: var(--space-2) var(--space-5);
    background: transparent;
    border: none;
    border-radius: 0;
    color: var(--text-alpha-tertiary);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    transition: color var(--duration-normal), background var(--duration-normal);
}

/* Vertical dividers between segments */
.sub-nav-tab + .sub-nav-tab::before {
    content: '';
    position: absolute;
    left: 0;
    top: 20%;
    height: 60%;
    width: 1px;
    background: rgba(74, 157, 122, 0.18);
    transition: opacity var(--duration-normal);
}

.sub-nav-tab:hover {
    background: rgba(74, 157, 122, 0.1);
    color: var(--text-alpha-secondary);
}

.sub-nav-tab.active {
    background: rgba(74, 157, 122, 0.18);
    color: var(--accent-light);
}

/* Hide divider next to & after active segment */
.sub-nav-tab.active::before,
.sub-nav-tab.active + .sub-nav-tab::before {
    opacity: 0;
}

/* Tab Content Panels */
.tab-panel {
    display: none;
    flex: 1;
    min-height: 0;
    overflow: auto;
    position: relative;
}

.tab-panel.active {
    display: flex;
    flex-direction: column;
}

/* Themed scrollbar for tab panels */
.tab-panel::-webkit-scrollbar { width: var(--scrollbar-width); }
.tab-panel::-webkit-scrollbar-track { background: var(--scrollbar-track); }
.tab-panel::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 2px; }
.tab-panel::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-hover); }
.tab-panel { scrollbar-width: thin; scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track); }

#tab-arena {
    overflow-x: hidden;
}

#tab-drill {
    overflow: hidden;
}

/* Learn/Discover Content Container */
.discover-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--space-5);
    overflow-y: auto;
    min-height: 0;
}

.discover-panel {
    display: none;
}

.discover-panel.active {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

/* Embedded viewers in discover panels */
.discover-panel .battle-log-viewer,
.discover-panel .hand-history-viewer,
.discover-panel .villains-viewer {
    width: 100%;
    flex: 1;
    height: auto;
    min-height: 400px;
    max-width: none;
    max-height: none;
    overflow-y: auto;
    border-radius: var(--radius-xl);
    box-shadow: none;
}

/* Hero Tab - Stats, Achievements, Activity */
.hero-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--space-5);
    min-height: 0;
}