/* shell.css — Reset + App Shell + Layout Primitives
 * Straturi: Reset → Typography → Shell → Sidebar → Topbar → Primitives
 */

/* ── 1. Reset ───────────────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background: var(--bg);
    min-height: 100vh;
}

img, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
button { cursor: pointer; border: none; background: none; font: inherit; }
ul, ol { list-style: none; }
input, textarea, select { font: inherit; }

:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}

/* ── 2. Typography ──────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-base);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--text-primary);
}

h1 { font-size: var(--font-size-xl); }
h2 { font-size: var(--font-size-lg); }
h3 { font-size: var(--font-size-md); }
h4 { font-size: var(--font-size-base); }

p { margin-bottom: var(--space-4); }
p:last-child { margin-bottom: 0; }

/* ── 3. App Shell ───────────────────────────────────────────────── */
.app-shell {
    display: flex;
    min-height: 100vh;
}

.main-area {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    margin-left: var(--sidebar-width);
    transition: margin-left var(--duration-normal) var(--easing-default);
}

#main-content {
    flex: 1;
    padding: var(--content-padding);
    max-width: var(--content-max-width);
    width: 100%;
    margin: 0 auto;
}

/* ── 4. Sidebar ─────────────────────────────────────────────────── */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    z-index: var(--z-sticky);
    overflow-y: auto;
    overflow-x: hidden;
    transition: transform var(--duration-normal) var(--easing-default);
}

.sb-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-4);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.sb-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: #ffffff;
    font-family: var(--font-family-base);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-bold);
    text-decoration: none;
}

.sb-logo__icon { font-size: 1.25rem; }

.sb-close {
    display: none;
    color: var(--sb-text);
    padding: var(--space-1);
    border-radius: var(--radius-sm);
    line-height: 1;
    font-size: 1rem;
    transition: color var(--duration-fast);
}

.sb-close:hover { color: #fff; }

.sb-nav {
    padding: var(--space-3) 0;
}

.sb-nav__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-4);
    color: var(--sb-text);
    font-family: var(--font-family-ui);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: 0;
    transition: color var(--duration-fast), background var(--duration-fast);
    text-decoration: none;
}

.sb-nav__item:hover {
    color: var(--sb-text-hover);
    background: rgba(255,255,255,0.05);
    text-decoration: none;
}

.sb-nav__item--active {
    color: var(--sb-active-text);
    background: var(--sb-active-bg);
}

.sb-nav__item--accent {
    color: #e8a59e;
}

.sb-divider {
    height: 1px;
    background: rgba(255,255,255,0.06);
    margin: var(--space-2) var(--space-4);
}

.sb-footer {
    margin-top: auto;
    padding: var(--space-4);
    border-top: 1px solid rgba(255,255,255,0.06);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.sb-user {
    display: block;
    padding: var(--space-2) 0;
    text-decoration: none;
}

.sb-user__name {
    font-family: var(--font-family-ui);
    font-size: var(--font-size-sm);
    color: var(--sb-text);
    font-weight: var(--font-weight-medium);
}

.sb-logout {
    width: 100%;
    justify-content: center;
}

/* Sidebar overlay (mobil) */
.sb-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--overlay);
    z-index: calc(var(--z-sticky) - 1);
    opacity: 0;
    transition: opacity var(--duration-normal) var(--easing-default);
}

/* ── 5. Topbar ──────────────────────────────────────────────────── */
.topbar {
    display: none;
    align-items: center;
    height: var(--topbar-height);
    padding: 0 var(--space-4);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    gap: var(--space-3);
}

.topbar__hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    min-width: 44px;
    min-height: 44px;
    justify-content: center;
    align-items: center;
    transition: background var(--duration-fast);
}

.topbar__hamburger:hover { background: var(--surface-2); }

.hamburger-line {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform var(--duration-normal) var(--easing-default);
}

.topbar__logo {
    font-family: var(--font-family-base);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    text-decoration: none;
    flex: 1;
}

.topbar__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* ── 6. Layout Primitives ───────────────────────────────────────── */

/* Page Container */
.page-container {
    width: 100%;
    max-width: var(--content-max-width);
}

/* Page Header */
.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-5);
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.page-header__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

.page-header__subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--space-1);
    font-family: var(--font-family-ui);
}

.page-header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-shrink: 0;
}

/* Stack */
.stack { display: flex; flex-direction: column; }
.stack--sm   { gap: var(--space-2); }
.stack--md   { gap: var(--space-4); }
.stack--lg   { gap: var(--space-6); }
.stack--xl   { gap: var(--space-7); }

/* Cluster */
.cluster { display: flex; flex-wrap: wrap; align-items: center; }
.cluster--sm  { gap: var(--space-2); }
.cluster--md  { gap: var(--space-4); }
.cluster--lg  { gap: var(--space-5); }

/* Grid */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: var(--space-4); }

/* Section */
.section {
    margin-bottom: var(--space-7);
}

.section__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-5);
}

.section__title {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-bold);
}

/* Error Page */
.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--space-6);
}

.error-page__inner {
    text-align: center;
    max-width: 480px;
}

.error-page__code {
    font-size: 6rem;
    font-weight: var(--font-weight-bold);
    color: var(--border-strong);
    line-height: 1;
    margin-bottom: var(--space-4);
}

.error-page__title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-3);
}

.error-page__desc {
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    font-family: var(--font-family-ui);
}

/* ── 7. Responsive ──────────────────────────────────────────────── */
@media (max-width: 1100px) {
    :root { --sidebar-width: 200px; }
}

@media (max-width: 900px) {
    :root { --sidebar-width: var(--sidebar-width-compact); }
    .sb-logo__text, .sb-nav__item span:not([aria-hidden]),
    .sb-footer .btn span, .sb-user__name { display: none; }
    .sb-nav__item { justify-content: center; padding: var(--space-3); }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
        z-index: var(--z-modal);
    }

    .sidebar.sb-open { transform: translateX(0); }
    .sb-logo__text  { display: block; }
    .sb-nav__item span:not([aria-hidden]) { display: inline; }
    .sb-user__name  { display: block; }
    .sb-nav__item   { justify-content: flex-start; padding: var(--space-2) var(--space-4); }
    .sb-close       { display: flex; }

    .sb-overlay { display: block; }
    .sb-overlay.sb-open { opacity: 1; }

    .main-area  { margin-left: 0; }
    .topbar     { display: flex; }

    #main-content { padding: var(--space-4); }
}

@media (max-width: 480px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .page-header { flex-direction: column; }
}