/* ============================================
   API Tester v2 - Layout Styles
   Main Application Layout Structure
   ============================================ */

/* ========== App Container ========== */
.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: transparent;
}

/* ========== Header ========== */
.header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-6);
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
}

[data-theme="light"] .header {
    background-color: var(--color-bg-secondary);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.header-logo-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.header-logo-icon svg {
    width: 18px;
    height: 18px;
}

.header-version {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    background-color: var(--color-glass);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

/* ========== Main Layout ========== */
.main-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
    min-width: 0;
}

/* ========== Sidebar ========== */
.sidebar {
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    position: fixed;
    top: var(--header-height);
    left: 0;
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    overflow: hidden;
    flex-shrink: 0;
    z-index: var(--z-fixed);
    transition: width var(--transition-slow), transform var(--transition-slow);
}

[data-theme="light"] .sidebar {
    background-color: rgba(255, 255, 255, 0.9);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-4);
}

.sidebar-section {
    margin-bottom: var(--spacing-6);
}

.sidebar-section:last-child {
    margin-bottom: 0;
}

.sidebar-section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-tertiary);
    text-transform: none;
    letter-spacing: 0;
    margin-bottom: var(--spacing-3);
    padding: 0 var(--spacing-2);
}

.sidebar-section-title svg {
    width: 14px;
    height: 14px;
    opacity: 0.7;
}

.sidebar-footer {
    padding: var(--spacing-4);
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

/* ========== Main Content ========== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background-color: transparent;
    margin-left: var(--sidebar-width);
    min-width: 0;
}

/* ========== Content Area ========== */
.content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: var(--spacing-5);
    overflow-y: auto;
    gap: var(--spacing-6);
}

/* ========== Panels ========== */
.panel {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: none;
}

.panel-glass {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    box-shadow: none;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-4) var(--spacing-5);
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg-tertiary);
}

.panel-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.panel-title svg {
    width: 18px;
    height: 18px;
    color: var(--color-text-tertiary);
}

.panel-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.panel-body {
    padding: var(--spacing-5);
}

.panel-body-compact {
    padding: var(--spacing-4);
}

.panel-footer {
    padding: var(--spacing-4) var(--spacing-5);
    border-top: 1px solid var(--color-border);
    background-color: var(--color-bg-tertiary);
}

/* ========== Request Panel ========== */
.request-panel {
    display: flex;
    flex-direction: column;
}

/* ========== Response Panel ========== */
.response-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 300px;
}

.response-panel .panel-body {
    flex: 1;
    overflow-y: auto;
}

/* ========== Split Layout ========== */
.split-layout {
    display: flex;
    gap: var(--spacing-6);
    flex: 1;
}

.split-layout-vertical {
    flex-direction: column;
}

.split-pane {
    flex: 1;
    min-width: 0;
    min-height: 0;
}

/* ========== Card Grid ========== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-4);
}

/* ========== Divider ========== */
.divider {
    height: 1px;
    background-color: var(--color-border);
    margin: var(--spacing-4) 0;
}

.divider-vertical {
    width: 1px;
    height: auto;
    margin: 0 var(--spacing-4);
}

/* ========== Empty State ========== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-12);
    text-align: center;
    color: var(--color-text-secondary);
}

.empty-state-icon {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-4);
    color: var(--color-text-muted);
    opacity: 0.5;
}

.empty-state-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-2);
}

.empty-state-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    max-width: 300px;
}

/* ========== Responsive Layout ========== */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: var(--shadow-md);
    }

    .sidebar.is-open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

.sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        top: var(--header-height);
        background-color: rgba(0, 0, 0, 0.5);
        z-index: calc(var(--z-fixed) - 1);
    }

    .sidebar-overlay.is-visible {
        display: block;
    }

    .content-area {
        padding: var(--spacing-4);
        max-width: none;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 0 var(--spacing-4);
    }

    .header-logo span {
        display: none;
    }

    .split-layout {
        flex-direction: column;
    }

    .content-area {
        padding: var(--spacing-3);
        gap: var(--spacing-4);
    }

    .panel-body {
        padding: var(--spacing-4);
    }

    .panel {
        border-radius: var(--radius-md);
    }
}

@media (max-width: 480px) {
    :root {
        --header-height: 56px;
    }

    .header {
        padding: 0 var(--spacing-3);
    }

    .content-area {
        padding: var(--spacing-3);
        gap: var(--spacing-3);
    }

    .panel-header {
        padding: var(--spacing-3) var(--spacing-4);
    }

    .panel-body {
        padding: var(--spacing-3);
    }
}