/**
 * Main Stylesheet
 * Core styles and responsive layout for LLM Token Generation Visualizer
 */

/* ===== CSS Variables ===== */
:root {
    /* Color Palette */
    --color-bg: #1E1E2E;
    --color-bg-light: #2A2A3E;
    --color-bg-lighter: #3A3A4E;
    --color-text: #E0E0E0;
    --color-text-dim: #A0A0A0;
    --color-text-bright: #FFFFFF;

    /* Semantic Colors */
    --color-input: #4A90E2;
    --color-output: #7ED321;
    --color-selected: #F5A623;
    --color-prob-high: #50E3C2;
    --color-prob-medium: #F5A623;
    --color-prob-low: #E85D75;

    /* Accent Colors */
    --color-primary: #4A90E2;
    --color-secondary: #7ED321;
    --color-accent: #F5A623;
    --color-danger: #E85D75;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-pill: 999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.4);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    --font-mono: 'Fira Code', 'Courier New', Consolas, Monaco, monospace;

    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 20px;
    --font-size-xl: 24px;
    --font-size-xxl: 32px;

    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-normal: 300ms ease-out;
    --transition-slow: 500ms ease-out;

    /* Z-indices */
    --z-base: 1;
    --z-controls: 100;
    --z-detail-panel: 200;
    --z-overlay: 300;
}

/* ===== Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-md);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

/* ===== Layout ===== */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1600px;
    margin: 0 auto;
    padding-bottom: 120px; /* Space for fixed controls */
}

/* ===== Header ===== */
.app-header {
    padding: var(--spacing-lg) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-bg-light) 0%, var(--color-bg-lighter) 100%);
    border-bottom: 2px solid var(--color-primary);
    text-align: center;
}

.app-header h1 {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    color: var(--color-text-bright);
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    font-size: var(--font-size-md);
    color: var(--color-text-dim);
    margin-bottom: var(--spacing-lg);
    display: block;
}

.header-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
button {
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    cursor: pointer;
    border: none;
    outline: none;
    transition: all var(--transition-fast);
}

.btn-primary {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-primary);
    color: var(--color-text-bright);
    border-radius: var(--radius-md);
    font-weight: 600;
}

.btn-primary:hover {
    background: #3A7BC8;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(0);
}

.mode-toggle-btn,
.technical-toggle-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-lighter);
    color: var(--color-text);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-pill);
    font-weight: 500;
}

.mode-toggle-btn:hover,
.technical-toggle-btn:hover {
    background: var(--color-primary);
    color: var(--color-text-bright);
}

.mode-toggle-btn.active,
body.technical-mode .technical-toggle-btn {
    background: var(--color-primary);
    color: var(--color-text-bright);
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

/* ===== Sections ===== */
section {
    background: var(--color-bg-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-bg-lighter);
}

.section-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-bright);
}

.section-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-dim);
}

/* ===== Input Section ===== */
.input-controls {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.prompt-input {
    flex: 1;
    min-width: 200px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg);
    border: 2px solid var(--color-bg-lighter);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
}

.prompt-input:focus {
    border-color: var(--color-primary);
    outline: none;
}

.example-select {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg);
    border: 2px solid var(--color-bg-lighter);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: var(--font-size-sm);
    cursor: pointer;
}

.example-select:focus {
    border-color: var(--color-primary);
    outline: none;
}

/* ===== Output & Probability Container ===== */
.output-probability-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(30, 30, 46, 0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: var(--z-overlay);
}

.loading-overlay[hidden] {
    display: none;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-bg-lighter);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-overlay p {
    margin-top: var(--spacing-md);
    color: var(--color-text-dim);
    font-size: var(--font-size-lg);
}

/* ===== Responsive Design ===== */

/* Tablet (768px and up) */
@media (min-width: 768px) {
    .app-header h1 {
        font-size: 2.5rem;
    }

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

    .output-probability-container {
        grid-template-columns: 1fr 1fr;
    }
}

/* Desktop (1024px and up) */
@media (min-width: 1024px) {
    .app-container {
        padding-bottom: 100px;
    }

    .main-content {
        gap: var(--spacing-xl);
    }

    .section-header h2 {
        font-size: var(--font-size-xl);
    }

    .input-controls {
        flex-wrap: nowrap;
    }
}

/* Large Desktop (1440px and up) */
@media (min-width: 1440px) {
    .main-content {
        padding: var(--spacing-xxl) var(--spacing-xl);
    }
}

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.text-center {
    text-align: center;
}

.text-dim {
    color: var(--color-text-dim);
}

.text-bright {
    color: var(--color-text-bright);
}

/* ===== Focus Styles (Accessibility) ===== */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===== Scrollbar Styling ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-bg-lighter);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* ===== Display Mode (1920x1080 Dashboard) ===== */
body.display-mode {
    overflow: hidden;
}

body.display-mode .app-container {
    height: 100vh;
    max-height: 1080px;
    padding-bottom: 70px; /* Smaller controls */
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* Compact header */
body.display-mode .app-header {
    padding: var(--spacing-sm) var(--spacing-lg);
    flex-shrink: 0;
}

body.display-mode .app-header h1 {
    font-size: 24px;
    margin-bottom: 2px;
}

body.display-mode .subtitle {
    font-size: 13px;
    margin-bottom: 0;
}

body.display-mode .header-controls {
    display: none;
}

/* Main content uses remaining space */
body.display-mode .main-content {
    padding: var(--spacing-md) var(--spacing-lg);
    gap: var(--spacing-md);
    flex: 1;
    overflow: hidden;
    display: grid;
    grid-template-rows: auto 1fr;
    grid-template-columns: 1fr;
}

/* Compact input section - single row */
body.display-mode .input-section {
    padding: var(--spacing-sm) var(--spacing-md);
    grid-row: 1;
    min-height: auto;
}

body.display-mode .input-section .section-header {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    border-bottom: none;
    padding-bottom: 0;
}

body.display-mode .input-section .section-header h2 {
    font-size: 14px;
    font-weight: 600;
}

body.display-mode .input-section .section-subtitle {
    font-size: 11px;
}

body.display-mode .input-controls {
    display: none;
}

body.display-mode .input-panel {
    min-height: auto;
}

body.display-mode .input-panel .token-container {
    padding: var(--spacing-xs) var(--spacing-sm);
    gap: var(--spacing-xs);
    min-height: auto;
}

/* Hide thinking section entirely */
body.display-mode .thinking-section {
    display: none;
}

/* Main simulation area - 2 columns */
body.display-mode .output-probability-container {
    grid-row: 2;
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: var(--spacing-md);
    height: 100%;
    overflow: hidden;
}

/* Large output section */
body.display-mode .output-section {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

body.display-mode .output-section .section-header {
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    flex-shrink: 0;
}

body.display-mode .output-section .section-header h2 {
    font-size: 20px;
}

body.display-mode .output-section .section-subtitle {
    font-size: 13px;
}

body.display-mode .output-panel {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
}

body.display-mode .output-panel .token-container {
    gap: var(--spacing-sm);
    padding: 0;
}

/* Large probability section */
body.display-mode .probability-section {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

body.display-mode .probability-section .section-header {
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    flex-shrink: 0;
}

body.display-mode .probability-section .section-header h2 {
    font-size: 20px;
}

body.display-mode .probability-section .section-subtitle {
    font-size: 13px;
}

body.display-mode .probability-chart {
    flex: 1;
    overflow-y: auto;
}

body.display-mode .probability-bars {
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
}

body.display-mode .probability-bar-container {
    padding: var(--spacing-sm) var(--spacing-md);
    gap: var(--spacing-xs);
}

body.display-mode .bar-label {
    font-size: 14px;
}

body.display-mode .bar-track {
    height: 24px;
}

/* Larger tokens in display mode */
body.display-mode .token {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 16px;
    font-weight: 500;
}

body.display-mode .output-panel .token {
    font-size: 18px;
    padding: var(--spacing-sm) var(--spacing-md);
}

/* Compact controls */
body.display-mode .controls-container {
    padding: var(--spacing-xs) var(--spacing-lg);
    flex-shrink: 0;
}

body.display-mode .controls-panel {
    padding: var(--spacing-sm) var(--spacing-md);
    gap: var(--spacing-md);
}

body.display-mode .control-btn {
    width: 36px;
    height: 36px;
    font-size: 16px;
}

body.display-mode .control-btn.play-btn {
    width: 48px;
    height: 48px;
    font-size: 20px;
}

body.display-mode .speed-controls {
    gap: var(--spacing-xs);
}

body.display-mode .speed-label {
    font-size: 12px;
}

body.display-mode .speed-display {
    font-size: 14px;
}

body.display-mode .progress-text {
    font-size: 12px;
}

/* Hide controls completely */
body.hide-controls .controls-container {
    display: none;
}

body.hide-controls .app-container {
    padding-bottom: 0;
}

body.hide-controls .main-content {
    height: calc(100vh - 70px); /* Just header */
}

/* Add status indicator for thinking phase */
body.display-mode .output-section .section-header::after {
    content: attr(data-phase);
    margin-left: auto;
    padding: 4px 12px;
    background: var(--color-primary);
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0;
    transition: opacity 300ms;
}

body.display-mode .output-section .section-header.processing::after {
    opacity: 1;
}