/**
 * Sumtastic Web App Structure - Layout CSS
 *
 * Structural CSS for the standard webapp layout.
 * Requires: tokens.css (Sumtastic Design System)
 *
 * Usage: Include this file after tokens.css
 */

/* ============================================================
   RESET & BASE
   ============================================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--sum-font-family-web);
    background: var(--sum-elevation-solid-1);
    color: var(--sum-on-surface-primary);
    min-height: 100vh;
    font-size: var(--sum-font-size-body-md);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    letter-spacing: -0.011em;
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
}

/* ============================================================
   APP LAYOUT (Flexbox)
   ============================================================ */

.app-layout {
    display: flex;
    min-height: 100vh;
}

/* ============================================================
   SIDEBAR NAVIGATION (Fixed, 240px)
   ============================================================ */

.sidebar {
    width: 240px;
    background: var(--sum-elevation-solid-0);
    border-right: 1px solid var(--sum-elevation-solid-3);
    padding: var(--sum-spacing-xl) 0;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
}

.sidebar-brand {
    padding: 0 var(--sum-spacing-xl) var(--sum-spacing-xl);
    border-bottom: 1px solid var(--sum-elevation-solid-3);
    margin-bottom: var(--sum-spacing-xl);
}

.sidebar-brand h1 {
    font-family: var(--sum-font-family-web);
    font-size: 15px;
    font-weight: var(--sum-font-weight-semibold);
    color: var(--sum-on-surface-primary);
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: 0.02em;
}

.sidebar-brand .logo {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.sidebar-brand .logo svg,
.sidebar-brand .logo img {
    width: 28px;
    height: 28px;
    color: var(--sum-action-primary-enabled);
}

/* Navigation Sections */
.nav-section {
    margin-bottom: var(--sum-spacing-2xl);
}

.nav-section-label {
    font-size: 11px;
    font-weight: var(--sum-font-weight-semibold);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--sum-on-surface-tertiary);
    padding: 0 var(--sum-spacing-xl);
    margin-bottom: var(--sum-spacing-sm);
}

/* Navigation Items */
.nav-item {
    display: flex;
    align-items: center;
    padding: 10px var(--sum-spacing-xl);
    color: var(--sum-on-surface-secondary);
    text-decoration: none;
    font-size: var(--sum-font-size-body-md);
    font-weight: var(--sum-font-weight-medium);
    transition: all 0.15s ease;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: var(--sum-elevation-solid-2);
    color: var(--sum-on-surface-primary);
}

.nav-item.active {
    background: var(--sum-elevation-solid-2);
    color: var(--sum-on-surface-primary);
    border-left-color: var(--sum-action-primary-enabled);
    font-weight: var(--sum-font-weight-semibold);
}

/* Navigation Dot Icons */
.nav-item .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    border: 2px solid currentColor;
    margin-right: var(--sum-spacing-md);
}

.nav-item.active .dot {
    background: var(--sum-action-primary-enabled);
    border-color: var(--sum-action-primary-enabled);
}

/* ============================================================
   MAIN CONTENT
   ============================================================ */

.main-content {
    flex: 1;
    margin-left: 240px;
    padding: var(--sum-spacing-2xl) 32px;
    min-height: 100vh;
}

/* ============================================================
   PAGE HEADER
   ============================================================ */

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--sum-spacing-2xl);
    padding-bottom: var(--sum-spacing-lg);
    border-bottom: 1px solid var(--sum-elevation-solid-3);
}

/* Breadcrumb Navigation */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--sum-spacing-sm);
    font-size: var(--sum-font-size-body-md);
}

.breadcrumb a {
    color: var(--sum-on-surface-secondary);
    text-decoration: none;
}

.breadcrumb a:hover {
    color: var(--sum-on-surface-primary);
    text-decoration: underline;
}

.breadcrumb .separator {
    color: var(--sum-on-surface-tertiary);
}

.breadcrumb .current {
    color: var(--sum-on-surface-primary);
    font-weight: var(--sum-font-weight-semibold);
}

/* ============================================================
   PAGE TITLE
   ============================================================ */

.page-title {
    font-family: var(--sum-font-family-web);
    font-size: var(--sum-font-size-headline-xl);
    font-weight: var(--sum-font-weight-semibold);
    color: var(--sum-on-surface-primary);
    margin-bottom: var(--sum-spacing-2xl);
    letter-spacing: -0.025em;
}

/* ============================================================
   CARDS
   ============================================================ */

.card {
    background: var(--sum-elevation-solid-0);
    border-radius: var(--sum-border-radius-xs);
    padding: var(--sum-spacing-2xl);
    border: 1px solid var(--sum-elevation-solid-3);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card-header {
    font-size: 11px;
    font-weight: var(--sum-font-weight-semibold);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--sum-on-surface-tertiary);
    margin-bottom: var(--sum-spacing-lg);
}

/* ============================================================
   STAT CARDS
   ============================================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--sum-spacing-xl);
    margin-bottom: var(--sum-spacing-2xl);
}

.stat-card {
    background: var(--sum-elevation-solid-0);
    border-radius: var(--sum-border-radius-xs);
    padding: var(--sum-spacing-xl) var(--sum-spacing-2xl);
    border: 1px solid var(--sum-elevation-solid-3);
    border-left: 3px solid var(--sum-action-primary-enabled);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    transition: all 0.2s ease;
}

.stat-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.stat-card.success { border-left-color: var(--sum-status-success); }
.stat-card.warning { border-left-color: var(--sum-status-warning); }
.stat-card.danger { border-left-color: var(--sum-status-critical); }
.stat-card.info { border-left-color: var(--sum-status-info); }

.stat-label {
    font-size: var(--sum-font-size-body-sm);
    color: var(--sum-on-surface-tertiary);
    margin-bottom: var(--sum-spacing-sm);
    display: flex;
    align-items: center;
    gap: 6px;
}

.stat-value {
    font-family: var(--sum-font-family-web);
    font-size: 36px;
    font-weight: var(--sum-font-weight-semibold);
    color: var(--sum-on-surface-primary);
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--sum-spacing-sm);
    padding: 10px var(--sum-spacing-xl);
    border: none;
    border-radius: var(--sum-border-radius-xs);
    font-size: var(--sum-font-size-body-md);
    font-weight: var(--sum-font-weight-medium);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s ease;
}

.btn-primary {
    background: var(--sum-action-primary-enabled);
    color: var(--sum-action-on-action-primary);
}

.btn-primary:hover {
    background: var(--sum-action-primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--sum-action-secondary-enabled);
    color: var(--sum-action-on-action-secondary);
    border: 1px solid var(--sum-elevation-solid-3);
}

.btn-secondary:hover {
    background: var(--sum-action-secondary-hover);
    color: var(--sum-on-surface-primary);
}

/* ============================================================
   FORMS
   ============================================================ */

.form-group {
    margin-bottom: var(--sum-spacing-xl);
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: var(--sum-font-weight-semibold);
    color: var(--sum-on-surface-primary);
    margin-bottom: var(--sum-spacing-sm);
}

.form-input {
    width: 100%;
    padding: var(--sum-spacing-md) var(--sum-spacing-lg);
    background: var(--sum-elevation-solid-0);
    border: 1px solid var(--sum-elevation-solid-3);
    border-radius: var(--sum-border-radius-xs);
    color: var(--sum-on-surface-primary);
    font-size: var(--sum-font-size-body-md);
    font-family: var(--sum-font-family-web);
    transition: border-color 0.2s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--sum-action-primary-enabled);
    box-shadow: 0 0 0 3px rgba(10, 10, 10, 0.08);
}

/* ============================================================
   TABLES
   ============================================================ */

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    background: var(--sum-elevation-solid-2);
    font-size: 11px;
    font-weight: var(--sum-font-weight-semibold);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--sum-on-surface-secondary);
    padding: var(--sum-spacing-md) var(--sum-spacing-lg);
    text-align: left;
    border-bottom: 1px solid var(--sum-elevation-solid-3);
}

.data-table td {
    padding: var(--sum-spacing-md) var(--sum-spacing-lg);
    border-bottom: 1px solid var(--sum-elevation-solid-3);
    color: var(--sum-on-surface-secondary);
    font-size: var(--sum-font-size-body-md);
}

.data-table tr:hover td {
    background: var(--sum-elevation-solid-2);
    color: var(--sum-on-surface-primary);
}

/* ============================================================
   ALERTS
   ============================================================ */

.alert {
    padding: 14px 18px;
    border-radius: var(--sum-border-radius-xs);
    margin-bottom: var(--sum-spacing-xl);
    font-size: var(--sum-font-size-body-md);
}

.alert-success {
    background: rgba(122, 208, 133, 0.15);
    color: var(--sum-status-success);
    border: 1px solid rgba(122, 208, 133, 0.3);
}

.alert-error {
    background: rgba(255, 0, 0, 0.15);
    color: var(--sum-status-critical);
    border: 1px solid rgba(255, 0, 0, 0.3);
}

.alert-info {
    background: rgba(99, 142, 255, 0.15);
    color: var(--sum-status-info);
    border: 1px solid rgba(99, 142, 255, 0.3);
}

.alert-warning {
    background: rgba(255, 158, 158, 0.15);
    color: var(--sum-status-warning);
    border: 1px solid rgba(255, 158, 158, 0.3);
}

/* ============================================================
   RESPONSIVE BREAKPOINTS
   ============================================================ */

@media (max-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .sidebar {
        width: 64px;
        padding: var(--sum-spacing-lg) 0;
    }

    .sidebar-brand h1 span:not(.logo),
    .nav-section-label,
    .nav-item span:not(.dot) {
        display: none;
    }

    .nav-item {
        justify-content: center;
        padding: var(--sum-spacing-md);
    }

    .nav-item .dot {
        margin-right: 0;
    }

    .main-content {
        margin-left: 64px;
    }
}

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

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--sum-spacing-md);
    }

    .main-content {
        padding: var(--sum-spacing-lg);
    }
}