/* ============================================
   Page-Specific Styles
   ============================================ */

/* ---- Navigation ---- */
.nav {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    border-bottom: 1px solid var(--color-border);
    height: var(--nav-height);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.92);
}

[data-theme="dark"] .nav {
    background: rgba(15, 13, 26, 0.92);
}

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

.nav__logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
}

.nav__logo:hover {
    opacity: 0.85;
}

.nav__logo-img {
    height: 36px;
    width: auto;
}

.nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.nav__link {
    padding: 0.5rem 0.875rem;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.nav__link:hover,
.nav__link.active {
    color: var(--color-text);
    background: var(--color-bg-tertiary);
}

.nav__actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.nav__mobile-toggle {
    display: none;
    padding: var(--space-sm);
    color: var(--color-text);
    font-size: var(--font-size-xl);
}

/* Mobile nav */
@media (max-width: 768px) {
    .nav__links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-xs);
        transform: translateX(-100%);
        transition: transform var(--transition-slow);
        z-index: var(--z-overlay);
    }

    .nav__links.open {
        transform: translateX(0);
    }

    .nav__link {
        width: 100%;
        padding: var(--space-md);
        font-size: var(--font-size-base);
    }

    .nav__mobile-toggle {
        display: block;
    }
}

/* ---- Footer ---- */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--space-2xl) 0;
    margin-top: auto;
}

.footer__inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-2xl);
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.footer__brand {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.footer__brand-logo {
    display: inline-block;
    margin-bottom: var(--space-sm);
}

.footer__logo-img {
    height: 32px;
    width: auto;
}

.footer__brand-name {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.footer__heading {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer__link {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    padding: var(--space-xs) 0;
    transition: color var(--transition-fast);
}

.footer__link:hover {
    color: var(--color-primary);
}

.footer__bottom {
    border-top: 1px solid var(--color-border);
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
}

@media (max-width: 768px) {
    .footer__inner {
        grid-template-columns: 1fr 1fr;
    }

    .footer__brand {
        grid-column: span 2;
    }
}

@media (max-width: 480px) {
    .footer__inner {
        grid-template-columns: 1fr;
    }

    .footer__brand {
        grid-column: 1;
    }
}

/* ---- Home Page ---- */
.hero {
    text-align: center;
    padding: var(--space-3xl) 0;
}

.hero__title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-md);
    line-height: 1.1;
}

.hero__title-accent {
    color: var(--color-primary);
}

.hero__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
    line-height: var(--line-height-relaxed);
}

.hero__actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* ---- Category Section ---- */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-md);
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--space-xl);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-base);
}

.category-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    color: inherit;
}

.category-card__icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

.category-card__name {
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-xs);
}

.category-card__count {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

/* ---- Profile Page ---- */
.profile-header {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.profile-header__info {
    flex: 1;
}

.profile-header__name {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-xs);
}

.profile-header__email {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.profile-header__stats {
    display: flex;
    gap: var(--space-xl);
}

.profile-stat {
    text-align: center;
}

.profile-stat__value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

.profile-stat__label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ---- XP Bar ---- */
.xp-bar {
    margin-top: var(--space-md);
}

.xp-bar__header {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xs);
}

.xp-bar__track {
    height: 10px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.xp-bar__fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

/* ---- Error Pages ---- */
.error-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    text-align: center;
    padding: var(--space-2xl);
}

.error-page__code {
    font-size: 6rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: var(--space-md);
}

.error-page__message {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

/* ---- Leaderboard Page ---- */
.leaderboard {
    max-width: 800px;
    margin: 0 auto;
}

.leaderboard__header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.leaderboard__title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-xs);
}

.leaderboard__subtitle {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.leaderboard__podium {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.podium {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: inherit;
    transition: transform var(--transition-fast);
}

.podium:hover {
    transform: translateY(-4px);
    color: inherit;
}

.podium__avatar {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-xl);
    color: white;
    margin-bottom: var(--space-xs);
}

.podium--gold .podium__avatar {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    box-shadow: 0 0 16px rgba(245, 158, 11, 0.4);
}

.podium--silver .podium__avatar {
    background: linear-gradient(135deg, #94a3b8, #64748b);
    box-shadow: 0 0 12px rgba(148, 163, 184, 0.3);
}

.podium--bronze .podium__avatar {
    background: linear-gradient(135deg, #d97706, #92400e);
    box-shadow: 0 0 12px rgba(217, 119, 6, 0.3);
}

.podium__name {
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    margin-bottom: 2px;
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: center;
}

.podium__xp {
    font-size: var(--font-size-xs);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

.podium__pedestal {
    width: 100px;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: white;
    margin-top: var(--space-sm);
}

.podium--gold .podium__pedestal {
    background: linear-gradient(180deg, #f59e0b, #d97706);
    height: 100px;
}

.podium--silver .podium__pedestal {
    background: linear-gradient(180deg, #94a3b8, #64748b);
    height: 80px;
}

.podium--bronze .podium__pedestal {
    background: linear-gradient(180deg, #d97706, #92400e);
    height: 60px;
}

.leaderboard__table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.leaderboard__table thead th {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-sm) var(--space-md);
    border-bottom: 2px solid var(--color-border);
    text-align: left;
}

.leaderboard__table thead th:first-child {
    width: 60px;
    text-align: center;
}

.leaderboard__table thead th:last-child,
.leaderboard__table thead th:nth-child(3) {
    text-align: right;
}

.leaderboard__table tbody tr {
    transition: background var(--transition-fast);
}

.leaderboard__table tbody tr:hover {
    background: var(--color-bg-tertiary);
}

.leaderboard__table tbody td {
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
}

.leaderboard__table tbody td:first-child {
    text-align: center;
    font-weight: var(--font-weight-bold);
    color: var(--color-text-tertiary);
}

.leaderboard__table tbody td:last-child,
.leaderboard__table tbody td:nth-child(3) {
    text-align: right;
}

.leaderboard__rank--1 { color: #f59e0b; }
.leaderboard__rank--2 { color: #94a3b8; }
.leaderboard__rank--3 { color: #d97706; }

.leaderboard__user {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.leaderboard__user-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-xs);
    flex-shrink: 0;
}

.leaderboard__user-name {
    font-weight: var(--font-weight-medium);
}

.leaderboard__user--self {
    background: var(--color-primary-soft, rgba(124, 131, 224, 0.08));
    border-radius: var(--radius-md);
}

.leaderboard__user--self td {
    font-weight: var(--font-weight-semibold);
}

.leaderboard__xp {
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
}

.leaderboard__level {
    font-weight: var(--font-weight-medium);
}

.leaderboard__empty {
    text-align: center;
    padding: var(--space-3xl);
    color: var(--color-text-secondary);
}

.leaderboard__empty-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

@media (max-width: 600px) {
    .leaderboard__podium {
        gap: var(--space-sm);
    }

    .podium__pedestal {
        width: 80px;
    }

    .podium__avatar {
        width: 44px;
        height: 44px;
        font-size: var(--font-size-base);
    }

    .leaderboard__table thead th:nth-child(3),
    .leaderboard__table tbody td:nth-child(3) {
        display: none;
    }
}