/* ==========================================================================
   CODELAB — High-End Cyberpunk / Editorial Workspace Theme (Editor)
   ========================================================================== */

:root {
    --bg-main: #030304;
    --bg-card: #0c0c10;
    --bg-card-hover: #14141c;
    --bg-glass: rgba(12, 12, 16, 0.92);
    
    --accent-primary: #FF4500;
    --accent-primary-hover: #FF5511;
    --accent-glow: rgba(255, 69, 0, 0.35);
    
    --accent-secondary: #FF8C00;
    --accent-success: #10B981;
    --accent-danger: #EF4444;
    --accent-purple: #9333EA;

    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --text-dim: #64748B;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(255, 69, 0, 0.45);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    
    --font-sans: 'Space Grotesk', 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    --sidebar-width: 310px;
    --chat-panel-width: 42%;
    --chat-panel-collapsed-width: 44px;
    --terminal-panel-height: 220px;
    --resize-handle-size: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -ms-overflow-style: none !important;  /* IE and Edge */
    scrollbar-width: none !important;  /* Firefox */
}

::-webkit-scrollbar {
    display: none !important;
    width: 0 !important;
    height: 0 !important;
    background: transparent !important;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
    line-height: 1.5;
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* ==========================================================================
   Sidebar Drawer (Left Navigation & Exercises)
   ========================================================================== */
.sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(var(--sidebar-width), calc(100vw - 32px));
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 900;
    transform: translateX(calc(-100% - 16px));
    visibility: hidden;
    box-shadow: 18px 0 45px rgba(0, 0, 0, 0.85);
    transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1), visibility 0s linear 0.28s;
    will-change: transform;
    backdrop-filter: blur(16px);
}

.sidebar.open {
    transform: translateX(0);
    visibility: visible;
    transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1), visibility 0s;
}

.sidebar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 850;
    width: 100%;
    height: 100%;
    padding: 0;
    border: 0;
    background: rgba(3, 3, 4, 0.75);
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    cursor: default;
    transition: opacity 0.25s ease, visibility 0s linear 0.25s;
}

.sidebar-backdrop.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: opacity 0.25s ease, visibility 0s;
}

.btn-icon {
    width: 34px;
    height: 34px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-main);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    cursor: pointer;
    font: inherit;
    transition: all 0.2s ease;
}

.btn-icon:hover,
.btn-icon:focus-visible {
    background: rgba(255, 69, 0, 0.15);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    outline: none;
}

.mobile-menu-btn {
    margin-right: 10px;
    font-size: 18px;
}

.mobile-close {
    font-size: 16px;
}

.sidebar-header {
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    background: #08080c;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-icon {
    font-size: 18px;
    background: var(--accent-primary);
    color: #000;
    font-weight: 700;
    border-radius: var(--radius-sm);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 14px var(--accent-glow);
}

.brand h2 {
    font-size: 17px;
    font-weight: 700;
    font-family: var(--font-sans);
    letter-spacing: 1px;
    color: var(--text-main);
}

.personalities-section {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.section-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
}

.section-title-row h3 {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--accent-primary);
    font-weight: 700;
}

.section-subtitle {
    font-size: 11px;
    color: var(--text-dim);
    margin-bottom: 14px;
}

.btn-add {
    background: rgba(255, 69, 0, 0.12);
    color: var(--accent-primary);
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-sm);
    padding: 4px 10px;
    font-size: 11px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-add:hover {
    background: var(--accent-primary);
    color: #000;
}

.personalities-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.personality-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 14px;
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    position: relative;
}

.personality-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 69, 0, 0.3);
}

.personality-card.active {
    background: linear-gradient(135deg, rgba(255, 69, 0, 0.15), rgba(255, 140, 0, 0.05));
    border-color: var(--accent-primary);
    box-shadow: 0 0 14px var(--accent-glow);
}

.p-icon { font-size: 20px; }
.p-details { flex: 1; min-width: 0; }
.p-name { font-size: 13px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--text-main); }
.p-desc { font-size: 11px; color: var(--text-muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-top: 2px; }

.p-actions {
    display: none;
    position: absolute;
    right: 8px;
    top: 8px;
    gap: 4px;
}
.personality-card:hover .p-actions { display: flex; }
.btn-card-action { background: rgba(0,0,0,0.7); border: 1px solid var(--border-color); color: var(--text-muted); border-radius: 4px; width: 22px; height: 22px; font-size: 10px; cursor: pointer; }
.btn-card-action:hover { border-color: var(--accent-primary); color: var(--accent-primary); }

.sidebar-footer { padding: 14px 16px; border-top: 1px solid var(--border-color); background: #08080c; }

/* ==========================================================================
   Workspace Main & Header Bar
   ========================================================================== */
.workspace-main {
    flex: 1;
    width: 100%;
    min-width: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

.chat-header {
    height: 56px;
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    flex-shrink: 0;
    z-index: 10;
}

.active-personality-info { display: flex; align-items: center; gap: 10px; }
.active-emoji { font-size: 20px; }
.active-personality-info h2 { font-size: 14px; font-weight: 700; font-family: var(--font-sans); color: var(--text-main); }
.active-desc { font-size: 11px; color: var(--text-muted); }

.header-actions { display: flex; gap: 8px; align-items: center; }

/* ==========================================================================
   Split View & Column Panels
   ========================================================================== */
.split-view {
    flex: 1;
    display: flex;
    min-width: 0;
    min-height: 0;
    height: calc(100vh - 56px);
    overflow: hidden;
}

.split-view.three-columns {
    display: flex;
    flex-direction: row;
    width: 100%;
    height: calc(100vh - 56px);
    overflow: hidden;
}

/* Column 1: Exercise Description Panel */
.exercise-panel {
    flex: 0 0 320px;
    min-width: 240px;
    max-width: 480px;
    min-height: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    overflow: hidden;
    position: relative;
}
.exercise-panel.is-collapsed {
    flex: 0 0 44px !important;
    min-width: 44px !important;
    max-width: 44px !important;
}
.exercise-panel.is-collapsed > :not(.left-collapsed-tab) {
    display: none;
}

.exercise-content {
    flex: 1 1 auto;
    overflow-y: auto;
    padding: 18px;
    font-size: 13px;
    line-height: 1.65;
    color: var(--text-main);
}
.exercise-content h2 {
    font-size: 17px;
    font-weight: 700;
    font-family: var(--font-sans);
    color: var(--text-main);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.exercise-content p {
    color: #a0a0b2;
    margin-bottom: 14px;
}
.exercise-content .section-title {
    font-weight: 700;
    color: var(--accent-primary);
    margin-top: 16px;
    margin-bottom: 8px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.exercise-content code {
    background: rgba(255, 69, 0, 0.1);
    border: 1px solid rgba(255, 69, 0, 0.25);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--accent-primary);
}

/* Column 3: AI Tutor Panel (Right Column) */
.chat-panel {
    flex: 0 0 340px;
    min-width: 260px;
    max-width: 500px;
    min-height: 0;
    display: flex;
    flex-direction: column;
    background: #060609;
    border-left: 1px solid var(--border-color);
    overflow: hidden;
    position: relative;
}
.chat-panel.is-collapsed {
    flex: 0 0 44px !important;
    min-width: 44px !important;
    max-width: 44px !important;
}
.chat-panel.is-collapsed > :not(.right-collapsed-tab) {
    display: none;
}

/* Collapsed Tab Styling */
.panel-collapsed-tab {
    display: none !important;
    width: 100%;
    height: 100%;
    padding: 12px 0;
    border: 0;
    background: linear-gradient(180deg, rgba(255, 69, 0, 0.1), var(--bg-card));
    color: var(--text-muted);
    cursor: pointer;
    align-items: center;
    justify-content: flex-start;
    flex-direction: column;
    gap: 10px;
    font-family: var(--font-sans);
}
.exercise-panel.is-collapsed .left-collapsed-tab,
.chat-panel.is-collapsed .right-collapsed-tab {
    display: flex !important;
}

.panel-collapsed-tab:hover,
.panel-collapsed-tab:focus-visible {
    color: var(--text-main);
    background: linear-gradient(180deg, rgba(255, 69, 0, 0.25), var(--bg-card));
    outline: 2px solid var(--accent-primary);
    outline-offset: -2px;
}

.collapsed-tab-icon,
.collapsed-tab-arrow {
    line-height: 1;
}

.collapsed-tab-label {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.collapsed-tab-arrow {
    margin-top: auto;
    font-size: 20px;
    color: var(--accent-primary);
}

/* Resizers */
.resize-handle {
    position: relative;
    z-index: 5;
    flex: 0 0 auto;
    background: #08080c;
    outline: none;
    touch-action: none;
    transition: background 0.18s ease;
}

.resize-handle::after {
    content: '';
    position: absolute;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.15);
    transition: background 0.18s ease, box-shadow 0.18s ease;
}

.resize-handle:hover,
.resize-handle:focus-visible,
.resize-handle.is-dragging {
    background: rgba(255, 69, 0, 0.15);
}

.resize-handle:hover::after,
.resize-handle:focus-visible::after,
.resize-handle.is-dragging::after {
    background: var(--accent-primary);
    box-shadow: 0 0 10px var(--accent-glow);
}

.workspace-resize-handle {
    width: var(--resize-handle-size);
    cursor: col-resize;
}

.workspace-resize-handle::after {
    top: 50%;
    left: 50%;
    width: 2px;
    height: 44px;
    transform: translate(-50%, -50%);
}

.panel-header {
    padding: 10px 14px;
    background: #09090d;
    border-bottom: 1px solid var(--border-color);
    font-size: 12px;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.font-size-controls {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    background: rgba(255, 255, 255, 0.04);
    padding: 2px 4px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.btn-font-size {
    background: transparent;
    color: var(--text-muted);
    border: none;
    font-size: 10px;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-font-size:hover {
    background: rgba(255, 69, 0, 0.25);
    color: var(--accent-primary);
}

/* ==========================================================================
   Chat Messages & AI Tutor Panel
   ========================================================================== */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.welcome-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
}
.welcome-icon { font-size: 32px; margin-bottom: 8px; }
.welcome-card h2 { font-size: 16px; font-weight: 700; margin-bottom: 6px; color: var(--text-main); }
.welcome-card p { font-size: 12px; color: var(--text-muted); }

/* Chat Input */
.chat-input-container {
    padding: 12px;
    border-top: 1px solid var(--border-color);
    background: #09090d;
}

.input-form {
    display: flex;
    gap: 8px;
    background: #030304;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 6px 10px;
}

.input-form:focus-within { border-color: var(--accent-primary); box-shadow: 0 0 10px var(--accent-glow); }

textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 13px;
    padding: 6px;
    resize: none;
    outline: none;
    max-height: 100px;
}

.btn-send {
    background: var(--accent-primary);
    color: #000;
    border: none;
    border-radius: var(--radius-sm);
    padding: 0 14px;
    font-weight: 700;
    font-size: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
    box-shadow: 0 0 12px var(--accent-glow);
}

.btn-send:hover {
    background: var(--accent-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 0 18px var(--accent-glow);
}

.btn-mic {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: var(--radius-sm);
    width: 34px;
    height: 34px;
    font-size: 15px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
    align-self: center;
}

.btn-mic:hover {
    background: rgba(255, 69, 0, 0.15);
    border-color: var(--accent-primary);
}

.btn-mic.recording {
    background: #EF4444;
    color: #FFF;
    border-color: #EF4444;
    box-shadow: 0 0 12px rgba(239, 68, 68, 0.6);
    animation: micPulse 1.2s infinite ease-in-out;
}

@keyframes micPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* ==========================================================================
   Center Panel: Monaco Editor & Terminal
   ========================================================================== */
.editor-panel {
    flex: 1 1 auto;
    min-width: 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
    background: #050508;
    overflow: hidden;
}

.editor-header {
    background: #09090d;
}

.lang-select-custom {
    background: #12121a;
    color: var(--accent-primary);
    border: 1px solid rgba(255, 69, 0, 0.3);
    border-radius: var(--radius-sm);
    padding: 3px 8px;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    outline: none;
    cursor: pointer;
}

.monaco-container {
    flex: 1 1 auto;
    width: 100%;
    min-width: 0;
    min-height: 160px;
    overflow: hidden;
    background: #050508;
}

.terminal-resize-handle {
    width: 100%;
    height: var(--resize-handle-size);
    cursor: row-resize;
}

.terminal-resize-handle::after {
    top: 50%;
    left: 50%;
    width: 44px;
    height: 2px;
    transform: translate(-50%, -50%);
}

/* Terminal Console Output */
.terminal-panel {
    flex: 0 0 var(--terminal-panel-height);
    min-height: 110px;
    background: #040406;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-top: 1px solid var(--border-color);
}

.terminal-header {
    padding: 8px 14px;
    background: #0a0a0f;
    border-bottom: 1px solid var(--border-color);
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
}

.status-badge {
    color: var(--accent-secondary);
    font-size: 10px;
    font-family: var(--font-mono);
}

.terminal-output {
    flex: 1;
    padding: 12px 16px;
    overflow-y: auto;
    font-family: var(--font-mono);
    font-size: 12px;
    color: #FF9944;
    white-space: pre-wrap;
}

/* ==========================================================================
   Buttons & Actions
   ========================================================================== */
.btn-success {
    background: linear-gradient(135deg, #10B981, #059669);
    color: #FFFFFF;
    border: none;
    padding: 7px 16px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    font-family: var(--font-mono);
    letter-spacing: 0.5px;
    box-shadow: 0 0 16px rgba(16, 185, 129, 0.45);
    transition: all 0.25s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-success:hover {
    background: linear-gradient(135deg, #34D399, #10B981);
    box-shadow: 0 0 24px rgba(16, 185, 129, 0.7);
    transform: translateY(-1px);
}

.btn-run {
    background: var(--accent-primary);
    color: #000;
    border: none;
    padding: 7px 16px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    font-family: var(--font-mono);
    letter-spacing: 0.5px;
    box-shadow: 0 0 14px var(--accent-glow);
    transition: all 0.25s ease;
}

.btn-run:hover {
    background: var(--accent-primary-hover);
    box-shadow: 0 0 22px var(--accent-glow);
    transform: translateY(-1px);
}

.btn-test {
    background: linear-gradient(135deg, #8B5CF6, #6D28D9);
    color: #FFF;
    border: none;
    padding: 7px 16px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    font-family: var(--font-mono);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.35);
    transition: all 0.25s ease;
}

.btn-test:hover {
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.55);
    transform: translateY(-1px);
}

.btn-primary {
    background: var(--accent-primary);
    color: #000;
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 0 12px var(--accent-glow);
    transition: all 0.2s ease;
}

.btn-primary:hover {
    background: var(--accent-primary-hover);
    box-shadow: 0 0 18px var(--accent-glow);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-secondary:hover {
    background: rgba(255, 69, 0, 0.12);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-outline:hover {
    border-color: var(--accent-primary);
    color: var(--text-main);
    background: rgba(255, 69, 0, 0.1);
}

.btn-sm {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
}

.btn-sm:hover {
    border-color: var(--accent-primary);
    color: var(--text-main);
}

.terminal-tabs {
    display: flex;
    gap: 8px;
}

.term-tab {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.term-tab.active {
    background: rgba(255, 69, 0, 0.15);
    color: var(--accent-primary);
    border: 1px solid rgba(255, 69, 0, 0.3);
}

.terminal-content {
    flex: 1;
    overflow-y: auto;
    position: relative;
    display: flex;
    flex-direction: column;
}

.hidden { display: none !important; }

/* Test Results Container */
.test-results-container {
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.test-placeholder {
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
    margin-top: 20px;
}

.test-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.test-card.passed {
    border-left: 4px solid var(--accent-success);
    background: rgba(16, 185, 129, 0.05);
}

.test-card.failed {
    border-left: 4px solid var(--accent-danger);
    background: rgba(239, 68, 68, 0.05);
}

/* ==========================================================================
   Modals
   ========================================================================== */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(3, 3, 4, 0.82);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s ease;
}

.modal-backdrop.open,
.modal-backdrop.active {
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto !important;
}

.modal-card {
    background: #0b0b10;
    border: 1px solid rgba(255, 69, 0, 0.3);
    border-radius: var(--radius-lg);
    width: min(520px, 92vw);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.9);
    overflow: hidden;
}

.modal-header {
    padding: 16px 20px;
    background: #08080c;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--accent-primary);
}

.modal-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.modal-footer {
    padding: 14px 20px;
    background: #08080c;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input,
.form-group select,
.form-group textarea {
    background: #030304;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    padding: 8px 12px;
    font-family: var(--font-sans);
    font-size: 13px;
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 10px var(--accent-glow);
}

.form-row {
    display: flex;
    gap: 12px;
}
.flex-1 { flex: 1; }
.flex-3 { flex: 3; }

/* Selector de Intensidad Tutor IA */
.intensity-select {
    background: #0d0d12;
    border: 1px solid rgba(255, 69, 0, 0.4);
    color: #ffaa88;
    border-radius: var(--radius-sm);
    padding: 3px 8px;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
}

.intensity-select:hover,
.intensity-select:focus {
    border-color: var(--accent-primary);
    color: #ffffff;
    box-shadow: 0 0 10px var(--accent-glow);
}

.intensity-select option {
    background: #0b0b10;
    color: #ffffff;
}

/* Página de Autenticación / Login (Centrado Cyberpunk) */
.auth-wrapper {
    min-height: 100vh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at 50% 35%, #1c0a05 0%, #050508 70%);
    font-family: var(--font-sans);
    padding: 24px;
    box-sizing: border-box;
}

.auth-card-container {
    background: rgba(12, 12, 18, 0.88);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 69, 0, 0.4);
    border-radius: var(--radius-lg);
    padding: 42px 36px;
    width: min(440px, 92vw);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.9), 0 0 35px rgba(255, 69, 0, 0.18);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 22px;
    text-align: center;
}

.auth-header-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.auth-logo-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 69, 0, 0.1);
    border: 1px solid rgba(255, 69, 0, 0.3);
    padding: 8px 18px;
    border-radius: 9999px;
}

.auth-code-icon {
    font-family: var(--font-mono);
    font-size: 20px;
    font-weight: 900;
    color: var(--accent-primary);
    text-shadow: 0 0 10px var(--accent-glow);
}

.auth-logo-text {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #FF4500, #FF7733, #FFFFFF);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.auth-subtitle {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
    max-width: 360px;
    margin: 0;
}

.auth-alert {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid var(--accent-danger);
    color: #fca5a5;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    width: 100%;
    box-sizing: border-box;
}

.btn-google {
    background: #ffffff;
    color: #111111;
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 700;
    border: none;
    border-radius: 12px;
    padding: 14px 24px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    cursor: pointer;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.4);
    transition: all 0.25s ease;
}

.btn-google:hover {
    background: #f8fafc;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.25);
}

.auth-footer {
    margin-top: 4px;
}

.auth-back-link {
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 500;
    text-decoration: none;
    transition: color 0.2s ease;
}

.auth-back-link:hover {
    color: var(--accent-primary);
}