/* Mobile First Layout */

/* Mobile: let the page scroll naturally */
html, body {
    height: auto;
    overflow-y: auto;
}

header {
    background-color: var(--color-nav-bg);
    width: 100%;
    z-index: 100;
    position: sticky;
    top: 0;
    flex-shrink: 0;
}

nav {
    padding: var(--spacing-sm) var(--spacing-md);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0;
}

nav li {
    position: relative;
    width: 100%;
}

nav a {
    color: var(--color-accent);
    font-weight: bold;
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    min-height: 48px;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

nav a:hover {
    text-decoration: none;
    background: rgba(0,0,0,0.05);
    border-radius: var(--radius-sm);
}

nav a[aria-current="page"] {
    border-bottom: 2px solid var(--color-accent);
}

nav ul ul {
    display: block;
    background: rgba(0,0,0,0.03);
    padding-left: var(--spacing-lg);
}

nav ul ul a {
    font-weight: normal;
    font-size: 0.95em;
}

nav ul ul ul {
    padding-left: var(--spacing-lg);
}

/* Mobile nav toggle */
.nav-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    background: none;
    border: none;
    color: var(--color-accent);
    font: inherit;
    font-weight: bold;
    font-size: 1em;
    cursor: pointer;
    padding: var(--spacing-sm) var(--spacing-md);
    min-height: 48px;
}

.nav-toggle-icon {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 20px;
}

.nav-toggle-icon span {
    display: block;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    transition: transform 0.2s, opacity 0.2s;
}

nav.nav-open .nav-toggle-icon span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

nav.nav-open .nav-toggle-icon span:nth-child(2) {
    opacity: 0;
}

nav.nav-open .nav-toggle-icon span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* Mobile: collapse nav list until toggled */
nav > ul {
    display: none;
}

nav.nav-open > ul {
    display: flex;
    flex-direction: column;
}

/* Mobile: single column, only main content scrolls */
body {
    display: flex;
    flex-direction: column;
}

main {
    display: grid;
    grid-template-columns: 1fr;
    flex: 1;
    width: 100%;
    max-width: 80rem;
    margin: 0 auto;
    padding: 0 clamp(var(--spacing-md), 2vw, var(--spacing-xl));
}

.column {
    padding: var(--spacing-lg) 0;
    width: 100%;
}

.left {
    order: 2;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
}

.middle {
    order: 1;
    padding-bottom: var(--spacing-xl);
}

/* Two-column desktop — sidebar + content */
@media (min-width: 48rem) {
    html, body {
        height: 100%;
        overflow: hidden;
    }

    main {
        grid-template-columns: minmax(14rem, 18rem) 1fr;
        gap: var(--spacing-lg);
        overflow: hidden;
    }

    .left {
        order: 1;
        border-bottom: none;
        border-right: 1px solid var(--color-border);
        padding-right: var(--spacing-lg);
        overflow-y: auto;
    }

    .middle {
        order: 2;
        overflow-y: auto;
    }

    .nav-toggle {
        display: none;
    }

    nav > ul {
        display: flex;
        flex-direction: row;
        gap: var(--spacing-sm);
    }

    nav ul {
        flex-direction: row;
        gap: var(--spacing-sm);
    }

    nav li {
        width: auto;
    }

    nav a {
        border-bottom: none;
        padding: var(--spacing-sm) var(--spacing-md);
    }

    nav ul ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        background: var(--color-nav-bg);
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        z-index: 200;
        width: 15.625rem;
        padding-left: 0;
    }

    nav li:hover > ul {
        display: block;
    }

    nav ul ul ul {
        left: 100%;
        top: 0;
        padding-left: 0;
    }
}

.column h2 {
    font-size: 1.2em;
    border-bottom: 2px solid var(--color-nav-bg);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.column ul {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.column li {
    margin-bottom: var(--spacing-sm);
}

.column li a {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) 0;
    min-height: 44px;
}

#content-placeholder {
    color: var(--color-text-light);
    font-size: 1.1em;
    text-align: center;
    padding: var(--spacing-xl);
}

/* Admin button — semantic button styled to match sidebar links */
#admin-btn {
    background: none;
    border: none;
    color: var(--color-link);
    cursor: pointer;
    font: inherit;
    padding: var(--spacing-sm) 0;
    min-height: 44px;
    display: flex;
    align-items: center;
}

#admin-btn:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}

/* Theme switcher */
.theme-switcher {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.theme-switcher button {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-text-light);
    cursor: pointer;
    font: inherit;
    font-size: 0.85em;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background 0.2s, color 0.2s;
}

.theme-switcher button:hover {
    background: var(--color-nav-bg);
    color: var(--color-accent);
}

.theme-switcher button.active {
    background: var(--color-nav-bg);
    color: var(--color-accent);
    border-color: var(--color-accent);
}

/* Search trigger button */
.search-trigger {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-white);
    color: var(--color-text-light);
    font: inherit;
    font-size: 0.9em;
    cursor: pointer;
    text-align: left;
    transition: border-color 0.2s, color 0.2s;
    min-height: 44px;
    display: flex;
    align-items: center;
}

.search-trigger:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Search overlay */
#search-overlay {
    position: fixed;
    inset: 0;
    z-index: 9000;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 15vh;
}

#search-overlay.hidden {
    display: none !important;
}

.search-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
}

.search-dialog {
    position: relative;
    width: 90%;
    max-width: 36rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    max-height: 60vh;
}

.search-input-wrap {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    gap: var(--spacing-sm);
}

.search-input-wrap input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    font: inherit;
    font-size: 1.1em;
    color: var(--color-text);
}

.search-input-wrap input::placeholder {
    color: var(--color-text-light);
}

.search-kbd {
    font-family: inherit;
    font-size: 0.75em;
    padding: 0.15em 0.4em;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-light);
    background: var(--color-nav-bg);
    line-height: 1;
    flex-shrink: 0;
}

.search-results {
    overflow-y: auto;
    padding: var(--spacing-sm) 0;
}

.search-hint {
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--color-text-light);
    font-size: 0.9em;
}

.search-result-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    text-decoration: none;
    color: var(--color-text);
    transition: background 0.1s;
    cursor: pointer;
}

.search-result-item:hover,
.search-result-item:focus {
    background: var(--color-nav-bg);
    outline: none;
    text-decoration: none;
    color: var(--color-text);
}

.search-result-title {
    display: block;
    font-weight: bold;
    color: var(--color-accent);
    margin-bottom: 0.15em;
}

.search-result-snippet {
    display: block;
    font-size: 0.85em;
    color: var(--color-text-light);
    line-height: 1.4;
}

@media (max-width: 48rem) {
    #search-overlay {
        padding-top: var(--spacing-lg);
    }

    .search-dialog {
        width: 95%;
        max-height: 80vh;
    }
}

/* Sidebar footer */
.sidebar-footer {
    margin-top: auto;
    padding-top: var(--spacing-lg);
    font-size: 0.8em;
    color: var(--color-text-light);
    line-height: 1.4;
}

/* Recent posts sidebar list */
.recent-posts-list .date {
    font-size: 0.8em;
    display: block;
    margin-top: -0.25rem;
}