/* ============================================================================
   Aristos-Axis IDE — Core Stylesheet
   Dark theme, 5-pane Cascade layout, smooth transitions, mobile-first
   ============================================================================ */

/* --- Reset & Variables --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --ax-bg:            #0a0a0a;
    --ax-bg-raised:     #111111;
    --ax-bg-surface:    #1a1a1a;
    --ax-bg-hover:      #222222;
    --ax-bg-active:     #2a2a2a;
    --ax-border:        #2a2a2a;
    --ax-border-focus:  rgba(212, 175, 55, 0.5);
    --ax-text:          #E0E0E0;
    --ax-text-muted:    #999999;
    --ax-text-bright:   #F0F0F0;
    --ax-accent:        #D4AF37;
    --ax-accent-hover:  #F3E392;
    --ax-accent-dim:    rgba(212, 175, 55, 0.12);
    --ax-success:       #10B981;
    --ax-warning:       #F59E0B;
    --ax-danger:        #EF4444;
    --ax-info:          #3B82F6;
    --ax-gold:          #D4AF37;
    --ax-gold-l:        #F3E392;
    --ax-gold-d:        #A27E2F;
    --ax-gold-gradient: linear-gradient(135deg, #BF953F 0%, #FCF6BA 25%, #B38728 50%, #FBF5B7 75%, #AA771C 100%);
    --ax-font:          'JetBrains Mono', 'Fira Code', ui-monospace, monospace;
    --ax-font-ui:       'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
    --ax-font-logo:     'Cinzel', serif;
    --ax-font-size:     13px;
    --ax-radius:        12px;
    --ax-radius-sm:     8px;
    --ax-radius-lg:     16px;
    --ax-sidebar-w:     288px;
    --ax-topbar-h:      48px;
    --ax-statusbar-h:   28px;
    --ax-tab-h:         40px;
    --ax-transition:    150ms cubic-bezier(0.4, 0, 0.2, 1);
    --ax-shadow:        0 2px 8px rgba(0,0,0,0.4);
    --ax-shadow-gold:   0 0 20px rgba(212,175,55,0.15);
}

html, body {
    height: 100%;
    overflow: hidden;
    background: var(--ax-bg);
    color: var(--ax-text);
    font-family: var(--ax-font-ui);
    font-size: var(--ax-font-size);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-text-size-adjust: 100%;
}

/* --- Scrollbar (Aristos Gold) --- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(212,175,55,0.3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(212,175,55,0.5); }
* { scrollbar-width: thin; scrollbar-color: rgba(212,175,55,0.3) transparent; }

/* --- Selection (Gold tint) --- */
::selection { background: rgba(212,175,55,0.25); color: var(--ax-text-bright); }

/* ============================================================================
   Layout Shell
   ============================================================================ */
.ax-shell {
    display: grid;
    grid-template-columns: var(--ax-sidebar-w) 1fr;
    grid-template-rows: var(--ax-topbar-h) 1fr var(--ax-statusbar-h);
    grid-template-areas:
        "sidebar topbar"
        "sidebar main"
        "sidebar statusbar";
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

/* --- Topbar --- */
.ax-topbar {
    grid-area: topbar;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 12px;
    background: var(--ax-bg-raised);
    border-bottom: 1px solid var(--ax-border);
    z-index: 20;
}
.ax-topbar-title {
    font-weight: 600;
    font-size: 12px;
    color: var(--ax-text-muted);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}
.ax-topbar-spacer { flex: 1; }
.ax-topbar-actions {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* --- Sidebar --- */
.ax-sidebar {
    grid-area: sidebar;
    display: flex;
    flex-direction: column;
    background: var(--ax-bg-raised);
    border-right: 1px solid var(--ax-border);
    overflow: hidden;
    z-index: 30;
    transition: transform var(--ax-transition), width var(--ax-transition);
}
.ax-sidebar-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-bottom: 1px solid var(--ax-border);
    min-height: var(--ax-topbar-h);
}
.ax-sidebar-logo {
    width: 24px;
    height: 24px;
    background: var(--ax-gold-gradient);
    border-radius: var(--ax-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 11px;
    color: #000;
    flex-shrink: 0;
}
.ax-sidebar-brand {
    font-weight: 600;
    font-size: 14px;
    color: var(--ax-text-bright);
    white-space: nowrap;
}
.ax-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 8px 6px;
    border-bottom: 1px solid var(--ax-border);
}
.ax-sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border-radius: var(--ax-radius-sm);
    color: var(--ax-text-muted);
    cursor: pointer;
    font-size: 12px;
    transition: background var(--ax-transition), color var(--ax-transition);
    user-select: none;
}
.ax-sidebar-nav-item:hover { background: var(--ax-bg-hover); color: var(--ax-text); }
.ax-sidebar-nav-item.active { background: var(--ax-accent-dim); color: var(--ax-gold); }
.ax-sidebar-nav-item svg { width: 16px; height: 16px; flex-shrink: 0; }
.ax-sidebar-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

/* --- File Tree --- */
.ax-file-tree {
    padding: 4px 0;
}
.ax-tree-item {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px 3px calc(var(--depth, 0) * 16px + 8px);
    cursor: pointer;
    font-size: 12px;
    color: var(--ax-text);
    transition: background var(--ax-transition);
    user-select: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.ax-tree-item:hover { background: var(--ax-bg-hover); }
.ax-tree-item.selected { background: rgba(212,175,55,0.1); color: var(--ax-gold); border-left: 2px solid var(--ax-gold); }
.ax-tree-item.context-active { border-right: 2px solid var(--ax-gold); }
.ax-tree-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    opacity: 0.7;
}
.ax-tree-chevron {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    transition: transform var(--ax-transition);
    opacity: 0.5;
}
.ax-tree-chevron.open { transform: rotate(90deg); }
.ax-tree-name { overflow: hidden; text-overflow: ellipsis; }
.ax-tree-dir > .ax-tree-children { display: none; }
.ax-tree-dir.expanded > .ax-tree-children { display: block; }

/* --- Main Content Area (Cascade Panes) --- */
.ax-main {
    grid-area: main;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--ax-bg);
}

/* --- Pane Container --- */
.ax-pane-container {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}
.ax-pane-container.horizontal { flex-direction: row; }
.ax-pane-container.vertical { flex-direction: column; }

/* --- Individual Pane --- */
.ax-pane {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius-sm);
    margin: 2px;
    background: var(--ax-bg-raised);
    transition: opacity var(--ax-transition), flex var(--ax-transition);
    min-width: 120px;
    min-height: 80px;
    position: relative;
}
.ax-pane.focused { border-color: var(--ax-border-focus); box-shadow: var(--ax-shadow-gold); }
.ax-pane.hidden-pane { display: none; }
.ax-pane-header {
    display: flex;
    align-items: center;
    height: var(--ax-tab-h);
    background: var(--ax-bg-surface);
    border-bottom: 1px solid var(--ax-border);
    padding: 0 4px;
    flex-shrink: 0;
    gap: 2px;
}
.ax-pane-tab {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: 11px;
    color: var(--ax-text-muted);
    border-radius: var(--ax-radius-sm) var(--ax-radius-sm) 0 0;
    cursor: pointer;
    transition: background var(--ax-transition), color var(--ax-transition);
    white-space: nowrap;
    max-width: 160px;
    overflow: hidden;
    text-overflow: ellipsis;
    user-select: none;
}
.ax-pane-tab:hover { background: var(--ax-bg-hover); color: var(--ax-text); }
.ax-pane-tab.active { background: var(--ax-bg-raised); color: var(--ax-text-bright); border-bottom: 2px solid var(--ax-gold); }
.ax-pane-tab-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--ax-warning);
    flex-shrink: 0;
    display: none;
}
.ax-pane-tab-dot.unsaved { display: block; }
.ax-pane-spacer { flex: 1; }
.ax-pane-actions {
    display: flex;
    gap: 2px;
}
.ax-pane-body {
    flex: 1;
    overflow: auto;
    position: relative;
}

/* --- Resize Handle --- */
.ax-resize-handle {
    flex-shrink: 0;
    background: transparent;
    z-index: 10;
    transition: background var(--ax-transition);
}
.ax-resize-handle:hover, .ax-resize-handle.active {
    background: var(--ax-gold);
}
.ax-resize-handle.horizontal {
    width: 4px;
    cursor: col-resize;
    margin: 2px 0;
}
.ax-resize-handle.vertical {
    height: 4px;
    cursor: row-resize;
    margin: 0 2px;
}

/* --- Editor Pane --- */
.ax-editor {
    width: 100%;
    height: 100%;
    background: transparent;
    color: var(--ax-text);
    border: none;
    outline: none;
    resize: none;
    padding: 8px 12px;
    font-family: var(--ax-font);
    font-size: var(--ax-font-size);
    line-height: 1.6;
    tab-size: 4;
    white-space: pre;
    overflow: auto;
}
.ax-editor::placeholder { color: var(--ax-text-muted); }
.ax-line-numbers {
    position: absolute;
    left: 0;
    top: 0;
    width: 48px;
    padding: 8px 8px 8px 0;
    text-align: right;
    font-family: var(--ax-font);
    font-size: var(--ax-font-size);
    line-height: 1.6;
    color: var(--ax-text-muted);
    user-select: none;
    pointer-events: none;
    opacity: 0.5;
}
.ax-editor-wrap .ax-editor { padding-left: 56px; }

/* --- Terminal Pane --- */
.ax-terminal {
    width: 100%;
    height: 100%;
    background: var(--ax-bg);
    color: var(--ax-success);
    border: none;
    outline: none;
    resize: none;
    padding: 8px 12px;
    font-family: var(--ax-font);
    font-size: 12px;
    line-height: 1.5;
    white-space: pre-wrap;
    overflow: auto;
}
.ax-terminal-input {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-top: 1px solid var(--ax-border);
    background: var(--ax-bg);
}
.ax-terminal-prompt {
    color: rgba(212,175,55,0.6);
    font-family: var(--ax-font);
    font-size: 12px;
    flex-shrink: 0;
}
.ax-terminal-input input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--ax-text);
    font-family: var(--ax-font);
    font-size: 12px;
}

/* --- AI Chat Pane --- */
.ax-chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.ax-chat-msg {
    max-width: 85%;
    padding: 8px 12px;
    border-radius: var(--ax-radius);
    font-size: 13px;
    line-height: 1.5;
    word-wrap: break-word;
    animation: ax-fadeIn 200ms ease;
}
.ax-chat-msg.user {
    align-self: flex-end;
    background: rgba(212,175,55,0.08);
    color: var(--ax-text-bright);
    border: 1px solid rgba(212,175,55,0.15);
}
.ax-chat-msg.assistant {
    align-self: flex-start;
    background: var(--ax-bg-surface);
    color: var(--ax-text);
    border: 1px solid var(--ax-border);
}
.ax-chat-msg code {
    font-family: var(--ax-font);
    font-size: 12px;
    background: rgba(0,0,0,0.3);
    padding: 1px 4px;
    border-radius: 3px;
}
.ax-chat-msg pre {
    background: var(--ax-bg);
    border-radius: var(--ax-radius-sm);
    padding: 8px;
    margin: 6px 0;
    overflow-x: auto;
    font-family: var(--ax-font);
    font-size: 12px;
    line-height: 1.5;
}
.ax-chat-input-wrap {
    display: flex;
    gap: 6px;
    padding: 8px 12px;
    border-top: 1px solid var(--ax-border);
    background: var(--ax-bg-surface);
}
.ax-chat-input {
    flex: 1;
    background: var(--ax-bg);
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius);
    padding: 6px 10px;
    color: var(--ax-text);
    font-family: var(--ax-font-ui);
    font-size: 13px;
    outline: none;
    resize: none;
    min-height: 36px;
    max-height: 120px;
    transition: border-color var(--ax-transition);
}
.ax-chat-input:focus { border-color: var(--ax-border-focus); box-shadow: var(--ax-shadow-gold); }

/* --- Preview Pane --- */
.ax-preview-frame {
    width: 100%;
    height: 100%;
    border: none;
    background: #fff;
}

/* --- Status Bar --- */
.ax-statusbar {
    grid-area: statusbar;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 12px;
    background: var(--ax-bg-raised);
    border-top: 1px solid var(--ax-border);
    font-size: 11px;
    color: var(--ax-text-muted);
    z-index: 20;
}
.ax-statusbar-left, .ax-statusbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}
.ax-statusbar-left { flex: 1; }
.ax-status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}
.ax-status-indicator.saved { background: var(--ax-success); }
.ax-status-indicator.saving { background: var(--ax-warning); animation: ax-pulse 1s infinite; }
.ax-status-indicator.error { background: var(--ax-danger); }

/* --- Buttons --- */
.ax-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 4px 8px;
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius-sm);
    background: var(--ax-bg-surface);
    color: var(--ax-text);
    font-family: var(--ax-font-ui);
    font-size: 11px;
    cursor: pointer;
    transition: background var(--ax-transition), border-color var(--ax-transition), color var(--ax-transition);
    white-space: nowrap;
    user-select: none;
}
.ax-btn:hover { background: var(--ax-bg-hover); border-color: var(--ax-text-muted); }
.ax-btn:active { background: var(--ax-bg-active); }
.ax-btn.primary { background: var(--ax-gold-gradient); background-size: 200% auto; border-color: transparent; color: #000; font-weight: 600; }
.ax-btn.primary:hover { background-position: right center; box-shadow: var(--ax-shadow-gold); }
.ax-btn svg { width: 14px; height: 14px; }
.ax-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border: none;
    border-radius: var(--ax-radius-sm);
    background: transparent;
    color: var(--ax-text-muted);
    cursor: pointer;
    transition: background var(--ax-transition), color var(--ax-transition);
}
.ax-icon-btn:hover { background: var(--ax-bg-hover); color: var(--ax-text); }
.ax-icon-btn svg { width: 14px; height: 14px; }

/* --- Toast Notifications --- */
.ax-toast-container {
    position: fixed;
    bottom: calc(var(--ax-statusbar-h) + 8px);
    right: 12px;
    z-index: 1000;
    display: flex;
    flex-direction: column-reverse;
    gap: 6px;
    pointer-events: none;
}
.ax-toast {
    padding: 8px 14px;
    border-radius: var(--ax-radius);
    font-size: 12px;
    background: var(--ax-bg-surface);
    border: 1px solid var(--ax-border);
    color: var(--ax-text);
    box-shadow: var(--ax-shadow);
    pointer-events: auto;
    animation: ax-slideUp 200ms ease;
    max-width: 320px;
}
.ax-toast.success { border-color: var(--ax-success); }
.ax-toast.error { border-color: var(--ax-danger); }
.ax-toast.warning { border-color: var(--ax-warning); }

/* --- Animations --- */
@keyframes ax-fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes ax-slideUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes ax-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* --- Optimistic UI --- */
.ax-optimistic { opacity: 0.7; transition: opacity var(--ax-transition); }
.ax-optimistic.confirmed { opacity: 1; }
.ax-optimistic.failed { opacity: 1; border-left: 2px solid var(--ax-danger); }

/* --- Gold Focus Ring (Aristos signature) --- */
.ax-btn:focus-visible, .ax-icon-btn:focus-visible {
    outline: 2px solid rgba(212,175,55,0.5);
    outline-offset: 2px;
    border-radius: var(--ax-radius-sm);
}

/* --- Card Hover Lift (Aristos signature) --- */
.ax-card-lift {
    transition: all 0.25s ease;
}
.ax-card-lift:hover {
    border-color: rgba(212,175,55,0.3);
    box-shadow: 0 0 20px rgba(212,175,55,0.15);
    transform: translateY(-1px);
}

/* --- Workspace Picker (overlay) --- */
.ax-workspace-picker {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: ax-fadeIn 200ms ease;
}
.ax-workspace-picker-inner {
    background: var(--ax-bg-raised);
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius);
    padding: 24px;
    width: 420px;
    max-width: 90vw;
    max-height: 80vh;
    overflow-y: auto;
}
.ax-workspace-picker-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--ax-text-bright);
    margin-bottom: 16px;
}
.ax-workspace-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius);
    cursor: pointer;
    margin-bottom: 8px;
    transition: border-color var(--ax-transition), background var(--ax-transition);
}
.ax-workspace-card:hover { border-color: var(--ax-gold); background: rgba(212,175,55,0.05); }
.ax-workspace-card-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--ax-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}
.ax-workspace-card-info { flex: 1; min-width: 0; }
.ax-workspace-card-name { font-weight: 600; font-size: 14px; color: var(--ax-text-bright); }
.ax-workspace-card-meta { font-size: 11px; color: var(--ax-text-muted); }

/* --- Loading Skeleton (Gold shimmer) --- */
.ax-skeleton {
    background: linear-gradient(90deg, #1a1a1a 25%, rgba(212,175,55,0.08) 50%, #1a1a1a 75%);
    background-size: 200% 100%;
    animation: ax-shimmer 2.5s linear infinite;
    border-radius: var(--ax-radius-sm);
}
@keyframes ax-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================================================================
   Responsive
   ============================================================================ */
.ax-sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 25;
}

@media (max-width: 1024px) {
    :root { --ax-sidebar-w: 240px; }
}

@media (max-width: 768px) {
    .ax-shell {
        grid-template-columns: 1fr;
        grid-template-areas:
            "topbar"
            "main"
            "statusbar";
    }
    .ax-sidebar {
        position: fixed;
        left: 0; top: 0; bottom: 0;
        width: 280px;
        transform: translateX(-100%);
        z-index: 40;
        box-shadow: var(--ax-shadow);
    }
    .ax-sidebar.open { transform: translateX(0); }
    .ax-sidebar-overlay.open { display: block; z-index: 35; }
    .ax-pane-container { flex-direction: column; }
    .ax-resize-handle.horizontal { width: 100%; height: 4px; cursor: row-resize; }
}

@media (max-width: 480px) {
    :root { --ax-font-size: 12px; --ax-topbar-h: 44px; }
    .ax-pane-header { height: 34px; }
    .ax-pane-tab { font-size: 10px; padding: 4px 8px; min-height: 44px; }
    .ax-chat-msg { max-width: 95%; }
    .ax-workspace-picker-inner { padding: 16px; }
    .ax-icon-btn { width: 44px; height: 44px; }
}