/* ==========================================================================
   Site Codex — Shared CSS
   CSS Custom Properties + Shared Components
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties (Color Palette)
   -------------------------------------------------------------------------- */
:root {
    /* Core palette */
    --rich-black: #0f1a20;
    --gunmetal: #202b31;
    --charcoal: #16262E;
    --alabaster: #e0e2db;
    --timberwolf: #c9c5ba;
    --blue-munsell: #388697;
    --olive: #6f732f;
    --satin-sheen-gold: #c99703;
    --jasper: #cd533b;
    --cordovan: #8a3033;
    --quinacridone-magenta: #8e4162;

    /* Derived / frequently used */
    --dark-surface: #2a3a42;
    --darker-surface: #243D4D;
    --muted-gray: #8a9a9e;
    --border-gray: #a8a49a;
    --nav-text: #243d4d;
    --btn-hover-light: #3a4a54;
    --white: #ffffff;

    /* Semantic aliases */
    --bg-primary: var(--rich-black);
    --bg-secondary: var(--gunmetal);
    --bg-surface: var(--charcoal);
    --text-primary: var(--alabaster);
    --text-secondary: var(--timberwolf);
    --accent: var(--blue-munsell);
    --accent-hover: var(--dark-surface);
    --danger: var(--jasper);
    --danger-dark: var(--cordovan);
    --success: var(--olive);
    --warning: var(--satin-sheen-gold);
    --highlight: var(--quinacridone-magenta);
}

/* --------------------------------------------------------------------------
   2. Base Reset
   -------------------------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
}

/* --------------------------------------------------------------------------
   3. Sidebar (shared across 14+ templates)
   -------------------------------------------------------------------------- */
.sidebar {
    width: 220px;
    min-width: 220px;
    height: 100vh;
    background: var(--timberwolf);
    display: flex;
    flex-direction: column;
    padding: 16px 12px;
    box-sizing: border-box;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 1000;
    overflow: hidden;
    border-right: 1px solid var(--border-gray);
    transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                min-width 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                padding 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
/* Paper grain texture overlay */
.sidebar::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: url('/static/icons/paper_grain.png') repeat;
    mix-blend-mode: multiply;
    opacity: 0.4;
}
.sidebar > * {
    position: relative;
    z-index: 1;
}
.sidebar.collapsed {
    width: 60px;
    min-width: 60px;
    padding: 16px 4px;
}
.sidebar-toggle {
    background: var(--timberwolf);
    border: 1px solid var(--border-gray);
    border-radius: 8px;
    padding: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    transition: background 0.2s, border-color 0.2s;
}
.sidebar-toggle:hover {
    background: var(--alabaster);
    border-color: var(--border-gray);
}
.sidebar-toggle img {
    width: 24px;
    height: 24px;
    transition: transform 0.3s ease;
}
.sidebar.collapsed .sidebar-toggle img {
    transform: rotate(180deg);
}
.sidebar-logo {
    width: 100%;
    padding: 10px 6px 12px 6px;
    display: flex;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-gray);
    margin-bottom: 16px;
    overflow: visible;
    position: relative;
    min-height: 100px;
    transition: min-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar.collapsed .sidebar-logo {
    min-height: 60px;
}
.sidebar-logo .logo-img {
    height: auto;
    transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
}
.sidebar-logo .logo-expanded {
    width: 140px;
    opacity: 1;
}
.sidebar-logo .logo-collapsed {
    width: 36px;
    opacity: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -55%);
}
.sidebar.collapsed .sidebar-logo .logo-expanded {
    width: 48px;
    opacity: 0;
}
.sidebar.collapsed .sidebar-logo .logo-collapsed {
    opacity: 1;
}
.sidebar-logo .logo-text {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 22px;
    font-weight: 700;
    color: var(--gunmetal);
    margin-top: -30px;
    opacity: 1;
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
    transition: opacity 0.2s ease 0.2s;
}
.sidebar.collapsed .sidebar-logo .logo-text {
    opacity: 0;
    transition: opacity 0.1s ease;
}
.sidebar-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.sidebar-nav-item {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 12px;
    padding: 10px 14px;
    border-radius: 10px;
    color: var(--nav-text);
    text-decoration: none;
    font-size: 0.95rem;
    transition: background 0.2s, color 0.2s,
                gap 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                padding 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    overflow: hidden;
}
.sidebar-nav-item:hover {
    background: var(--alabaster);
    color: var(--rich-black);
}
.sidebar-nav-item img {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}
.sidebar-nav-item span {
    opacity: 1;
    width: auto;
    overflow: hidden;
    transition: opacity 0.15s ease 0.2s,
                width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar.collapsed .sidebar-nav-item {
    padding: 10px 14px;
    gap: 0;
    transition: background 0.2s, color 0.2s,
                gap 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                padding 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar.collapsed .sidebar-nav-item span {
    opacity: 0;
    width: 0;
    transition: opacity 0.1s ease,
                width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar-nav-item.active {
    background: var(--alabaster);
    color: var(--rich-black);
}
.sidebar-user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--alabaster);
    border: 2px solid var(--timberwolf);
    object-fit: cover;
    flex-shrink: 0;
    transition: border-color 0.2s;
}
.sidebar-user-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    opacity: 1;
    max-width: 200px;
    transition: opacity 0.2s ease 0.15s,
                max-width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar.collapsed .sidebar-user-info {
    opacity: 0;
    max-width: 0;
    transition: opacity 0.1s ease,
                max-width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar-user-name {
    font-weight: bold;
    color: var(--nav-text);
    font-size: 0.9rem;
    white-space: nowrap;
}
.sidebar-user-section {
    margin-top: auto;
    display: flex;
    flex-direction: column;
}
.sidebar-user-top {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 8px;
    transition: gap 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                padding 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar-user-divider {
    height: 1px;
    background: var(--border-gray);
    margin: 0 8px;
}
.sidebar-logout {
    padding: 10px 8px;
}
.logout-btn {
    background: var(--alabaster);
    border: none;
    border-radius: 6px;
    padding: 8px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    transition: background 0.2s;
    text-decoration: none;
}
.logout-btn:hover {
    background: var(--cordovan);
}
.logout-btn img {
    width: 18px;
    height: 18px;
    filter: invert(0%) sepia(0%) saturate(0%) hue-rotate(0deg) brightness(20%) contrast(100%);
    transition: filter 0.2s;
}
.logout-btn:hover img {
    filter: invert(1);
}
.sidebar.collapsed .sidebar-user-top {
    gap: 0;
    padding: 12px 6px;
}
.sidebar.collapsed .sidebar-user-info {
    opacity: 0;
    max-width: 0;
}
.sidebar.collapsed .logout-btn {
    padding: 8px;
    justify-content: center;
}
.sidebar-avatar-link {
    display: block;
    flex-shrink: 0;
    transition: transform 0.2s ease;
}
.sidebar-avatar-link:hover {
    transform: scale(1.1);
}
.sidebar-avatar-link:hover .sidebar-user-avatar {
    border-color: var(--rich-black);
}

/* --------------------------------------------------------------------------
   4. Sidebar Instant-Collapse (prevents flash on page load)
   -------------------------------------------------------------------------- */
html.sidebar-start-collapsed .sidebar {
    width: 60px;
    min-width: 60px;
    padding: 16px 4px;
}
html.sidebar-start-collapsed .main-content {
    margin-left: 60px;
}
html.sidebar-start-collapsed .page-header {
    margin-left: 60px;
}
html.sidebar-start-collapsed .sidebar-logo .logo-text {
    opacity: 0;
}
html.sidebar-start-collapsed .sidebar-nav-item {
    gap: 0;
}
html.sidebar-start-collapsed .sidebar-nav-item span {
    opacity: 0;
    width: 0;
}
html.sidebar-start-collapsed .sidebar-user-info {
    opacity: 0;
    max-width: 0;
}
html.sidebar-start-collapsed .sidebar-logo .logo-expanded {
    width: 48px;
    opacity: 0;
}
html.sidebar-start-collapsed .sidebar-logo .logo-collapsed {
    opacity: 1;
}
html.sidebar-start-collapsed .sidebar-logo {
    min-height: 60px;
}

/* --------------------------------------------------------------------------
   5. Common Scrollbar Styles
   -------------------------------------------------------------------------- */
/* Thin scrollbar (4px) — used on most scrollable containers */
.thin-scrollbar::-webkit-scrollbar {
    width: 4px;
}
.thin-scrollbar::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 2px;
}
.thin-scrollbar::-webkit-scrollbar-thumb {
    background: var(--blue-munsell);
    border-radius: 2px;
}
.thin-scrollbar::-webkit-scrollbar-thumb:hover {
    background: #2a6b78;
}

/* --------------------------------------------------------------------------
   6. Page-Level Vignette Overlay
   Reusable radial-gradient vignette that darkens edges while keeping
   center transparent. Uses CSS custom properties for customisation.

   Usage:
     <div class="page-vignette"></div>          — default (fixed, full viewport)
     <div class="page-vignette soft"></div>     — lighter edges
     <div class="page-vignette heavy"></div>    — darker edges

   Customise per-element via CSS custom properties:
     --vignette-color    : base rgb (no alpha) — default: 15, 26, 32  (Rich Black)
     --vignette-start    : transparent stop    — default: 40%
     --vignette-mid-stop : mid stop            — default: 75%
     --vignette-mid-alpha: mid opacity         — default: 0.35
     --vignette-end-alpha: edge opacity        — default: 0.6
     --vignette-shape    : gradient shape      — default: ellipse at center

   Applied via {% block page_vignette %} in individual page templates.
   -------------------------------------------------------------------------- */
.page-vignette {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 3;
    background-image: radial-gradient(ellipse at 50% 50%, transparent 50%, rgba(0, 0, 0, 0.35) 100%);
    background-attachment: fixed;
}

/* Softer vignette — subtle edge darkening */
.page-vignette.soft {
    --vignette-start: 50%;
    --vignette-mid-alpha: 0.2;
    --vignette-end-alpha: 0.4;
}

/* Heavier vignette — dramatic edge darkening */
.page-vignette.heavy {
    --vignette-start: 30%;
    --vignette-mid-alpha: 0.5;
    --vignette-end-alpha: 0.75;
}

/* Relative-positioned variant for containers (not full viewport) */
.page-vignette.contained {
    position: absolute;
}