/* ============================================
   LINEAR DESIGN SYSTEM - Design Tokens
   ============================================ */

@tailwind base;
@tailwind components;
@tailwind utilities;

/* CSS Custom Properties - Design Tokens */
:root {
    /* Background Colors */
    --background-deep: #020203;
    --background-base: #050506;
    --background-elevated: #0a0a0c;
    
    /* Surface Colors */
    --surface: rgba(255, 255, 255, 0.05);
    --surface-hover: rgba(255, 255, 255, 0.08);
    
    /* Text Colors */
    --foreground: #EDEDEF;
    --foreground-muted: #8A8F98;
    --foreground-subtle: rgba(255, 255, 255, 0.60);
    
    /* Accent Colors */
    --accent: #5E6AD2;
    --accent-bright: #6872D9;
    --accent-glow: rgba(94, 106, 210, 0.3);
    
    /* Border Colors */
    --border-default: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.10);
    --border-accent: rgba(94, 106, 210, 0.30);
    
    /* Typography */
    --font-sans: 'Aptos', 'Segoe UI Variable Display', 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'Cascadia Mono', 'SF Mono', 'Fira Code', 'Consolas', monospace;
    
    /* Animation Easings */
    --ease-expo-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out: cubic-bezier(0.0, 0.0, 0.2, 1);
    
    /* Animation Durations */
    --duration-fast: 200ms;
    --duration-normal: 300ms;
    --duration-slow: 600ms;
    color-scheme: dark;
}

:root[data-theme='light'] {
    --background-deep: #e9eef8;
    --background-base: #FAFAFA;
    --background-elevated: #ffffff;

    --surface: rgba(15, 23, 42, 0.03);
    --surface-hover: rgba(15, 23, 42, 0.06);

    --foreground: #0F172A;
    --foreground-muted: #64748B;
    --foreground-subtle: rgba(15, 23, 42, 0.62);

    --accent: #0052FF;
    --accent-bright: #4D7CFF;
    --accent-glow: rgba(0, 82, 255, 0.24);

    --border-default: #E2E8F0;
    --border-hover: #CBD5E1;
    --border-accent: rgba(0, 82, 255, 0.35);
    color-scheme: light;
}

/* ============================================
   BASE STYLES
   ============================================ */

* {
    box-sizing: border-box;
}

html {
    margin: 0;
    padding: 0;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--background-base);
    color: var(--foreground);
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    transition: background-color var(--duration-normal) var(--ease-expo-out), color var(--duration-normal) var(--ease-expo-out);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    background: color-mix(in srgb, var(--background-base) 84%, transparent);
    border-bottom: 1px solid var(--border-default);
}

.site-header-inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.site-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    color: var(--foreground);
    text-decoration: none;
}

.site-logo-mark {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    flex: 0 0 auto;
    box-shadow: 0 14px 28px rgba(5, 22, 59, 0.2);
}

.site-logo-image {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.site-logo-text {
    font-weight: 700;
    letter-spacing: -0.01em;
    font-size: 1rem;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.site-header-actions {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
}

.language-selector {
    position: relative;
}

.language-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    border-radius: 999px;
    border: 1px solid var(--border-default);
    background: var(--surface);
    color: var(--foreground);
    padding: 0.42rem 0.7rem;
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    font-weight: 700;
    line-height: 1;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-expo-out);
}

.language-toggle:hover,
.language-toggle:focus-visible {
    border-color: var(--border-hover);
    outline: none;
}

.language-menu {
    position: absolute;
    right: 0;
    top: calc(100% + 0.4rem);
    min-width: 164px;
    border: 1px solid var(--border-default);
    border-radius: 12px;
    background: var(--background-elevated);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.24);
    padding: 0.35rem;
    z-index: 60;
}

.language-option {
    width: 100%;
    border: 1px solid transparent;
    background: transparent;
    color: var(--foreground);
    border-radius: 8px;
    font-size: 0.78rem;
    text-align: left;
    padding: 0.4rem 0.45rem;
    cursor: pointer;
}

.language-option:hover,
.language-option:focus-visible {
    background: var(--surface);
    border-color: var(--border-default);
    outline: none;
}

.header-donate-link {
    display: inline-flex;
    align-items: center;
    line-height: 0;
}

.site-nav-link {
    color: var(--foreground-muted);
    text-decoration: none;
    font-size: 0.82rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 0.4rem 0.65rem;
    border-radius: 999px;
    border: 1px solid transparent;
    transition: all var(--duration-fast) var(--ease-expo-out);
}

.site-nav-link:hover {
    color: var(--foreground);
    border-color: var(--border-default);
    background: var(--surface);
}

.site-nav-link-active {
    color: var(--foreground);
    border-color: var(--border-accent);
    background: color-mix(in srgb, var(--accent) 14%, transparent);
}

.theme-toggle {
    position: static;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border-radius: 999px;
    border: 1px solid var(--border-default);
    background: var(--surface);
    color: var(--foreground);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    padding: 0.5rem 0.875rem;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 600;
    transition: all var(--duration-fast) var(--ease-expo-out);
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.18);
}

.api-model-select {
    min-width: 230px;
    max-width: 280px;
}

.model-tooltip-wrap {
    margin-top: 0.55rem;
    display: inline-flex;
    align-items: flex-start;
    gap: 0.5rem;
    max-width: 100%;
}

.model-info-trigger {
    width: 1.2rem;
    height: 1.2rem;
    border-radius: 999px;
    border: 1px solid var(--border-default);
    background: var(--surface);
    color: var(--foreground-muted);
    font-size: 0.72rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    cursor: help;
    flex-shrink: 0;
    margin-top: 0.05rem;
}

.model-info-trigger:hover,
.model-info-trigger:focus-visible {
    color: var(--foreground);
    border-color: var(--border-hover);
    outline: none;
}

.model-info-text {
    font-size: 0.75rem;
    line-height: 1.45;
    color: var(--foreground-muted);
    border: 1px solid var(--border-default);
    background: var(--surface);
    border-radius: 10px;
    padding: 0.45rem 0.6rem;
}

.prompt-examples-list {
    margin: 0.65rem 0 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 0.45rem;
}

.prompt-examples-item {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.6rem;
    border: 1px solid var(--border-default);
    border-radius: 10px;
    background: var(--surface);
    padding: 0.5rem 0.6rem;
}

.prompt-examples-text {
    font-size: 0.75rem;
    line-height: 1.45;
    color: var(--foreground);
}

.prompt-examples-use {
    border: 1px solid var(--border-default);
    background: var(--background-elevated);
    color: var(--foreground-muted);
    border-radius: 8px;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 0.3rem 0.45rem;
    cursor: pointer;
    flex-shrink: 0;
}

.prompt-examples-use:hover,
.prompt-examples-use:focus-visible {
    color: var(--foreground);
    border-color: var(--border-hover);
    outline: none;
}

#improved-prompt {
    position: relative;
    font-size: 0.95rem;
    line-height: 1.8;
    letter-spacing: 0.005em;
    word-break: break-word;
    tab-size: 4;
    overflow-y: auto;
    transition: border-color var(--duration-fast) var(--ease-expo-out), box-shadow var(--duration-fast) var(--ease-expo-out), background var(--duration-fast) var(--ease-expo-out);
}

#improved-prompt.streaming-active {
    border-color: var(--border-accent);
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 16%, transparent), inset 0 1px 0 rgba(255, 255, 255, 0.04);
    background:
        linear-gradient(180deg, color-mix(in srgb, var(--accent) 8%, transparent), transparent 26%),
        linear-gradient(90deg, rgba(255, 255, 255, 0.015), rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.015));
}

#improved-prompt.streaming-active::after {
    content: '';
    display: inline-block;
    width: 0.62ch;
    height: 1.05em;
    margin-left: 0.16ch;
    vertical-align: -0.14em;
    border-radius: 2px;
    background: var(--accent-bright);
    box-shadow: 0 0 18px var(--accent-glow);
    animation: improved-prompt-caret 1s steps(1, end) infinite;
}

@keyframes improved-prompt-caret {
    0%, 48% {
        opacity: 1;
    }
    49%, 100% {
        opacity: 0;
    }
}

.theme-toggle:hover {
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.theme-toggle:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.mode-chip {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 0.25rem 0.75rem;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.11em;
    font-weight: 700;
    border: 1px solid transparent;
}

.mode-chip-analysis {
    color: #86efac;
    background: rgba(34, 197, 94, 0.12);
    border-color: rgba(34, 197, 94, 0.35);
}

.mode-chip-rewrite {
    color: #93c5fd;
    background: rgba(59, 130, 246, 0.12);
    border-color: rgba(59, 130, 246, 0.35);
}

.issue-icon {
    color: #f59e0b;
}

.metric-tile {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.metric-tile:hover {
    border-color: rgba(255, 255, 255, 0.12);
    transform: translateY(-1px);
}

.metric-label {
    color: var(--foreground-muted);
}

.metric-value {
    color: var(--foreground);
    letter-spacing: -0.01em;
}

.quality-breakdown {
    margin-bottom: 1rem;
    border: 1px solid var(--border-default);
    border-radius: 12px;
    padding: 0.75rem;
    background: var(--surface);
}

.quality-breakdown-title {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--foreground-muted);
    margin-bottom: 0.55rem;
}

.quality-breakdown-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.35rem;
}

.quality-breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.78rem;
    color: var(--foreground);
}

.quality-breakdown-main {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    min-width: 0;
}

.quality-breakdown-info {
    position: relative;
    width: 1.1rem;
    height: 1.1rem;
    border-radius: 999px;
    border: 1px solid var(--border-default);
    background: var(--surface);
    color: var(--foreground-muted);
    font-size: 0.68rem;
    font-weight: 700;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: help;
    padding: 0;
    flex-shrink: 0;
}

.quality-breakdown-info:hover,
.quality-breakdown-info:focus-visible {
    color: var(--foreground);
    border-color: var(--border-hover);
    outline: none;
}

.quality-breakdown-tooltip {
    position: absolute;
    left: 50%;
    bottom: calc(100% + 0.5rem);
    transform: translateX(-50%) translateY(6px);
    width: min(260px, 70vw);
    padding: 0.7rem 0.8rem;
    border-radius: 10px;
    border: 1px solid var(--border-default);
    background: color-mix(in srgb, var(--background-elevated) 92%, transparent);
    color: var(--foreground);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.24);
    font-size: 0.72rem;
    line-height: 1.45;
    text-align: left;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--duration-fast) var(--ease-expo-out), transform var(--duration-fast) var(--ease-expo-out), visibility var(--duration-fast) var(--ease-expo-out);
    z-index: 20;
}

.quality-breakdown-tooltip::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 100%;
    transform: translateX(-50%);
    border-width: 6px;
    border-style: solid;
    border-color: rgba(10, 10, 12, 0.92) transparent transparent transparent;
}

:root[data-theme='light'] .quality-breakdown-tooltip::after {
    border-color: rgba(255, 255, 255, 0.92) transparent transparent transparent;
}

.quality-breakdown-info:hover .quality-breakdown-tooltip,
.quality-breakdown-info:focus-visible .quality-breakdown-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.quality-breakdown-bar {
    width: 112px;
    height: 8px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--foreground-muted) 18%, transparent);
    overflow: hidden;
    flex-shrink: 0;
    border: 1px solid var(--border-default);
}

.quality-breakdown-bar-fill {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--accent), var(--accent-bright));
}

.quality-breakdown-bar-good {
    background: linear-gradient(90deg, #10b981, #34d399);
}

.quality-breakdown-bar-medium {
    background: linear-gradient(90deg, #f59e0b, #fbbf24);
}

.quality-breakdown-bar-low {
    background: linear-gradient(90deg, #ef4444, #fb7185);
}

.site-footer-grid {
    display: grid;
    grid-template-columns: repeat(1, minmax(0, 1fr));
    gap: 1.5rem;
    text-align: left;
}

@media (min-width: 900px) {
    .site-footer-grid {
        grid-template-columns: 1.2fr repeat(3, minmax(0, 1fr));
    }
}

.site-footer-title {
    margin: 0 0 0.65rem;
    font-size: 0.76rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--foreground);
}

.site-footer-copy {
    margin: 0;
    line-height: 1.6;
}

.site-footer-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.4rem;
}

.site-footer-link {
    color: var(--foreground-muted);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-expo-out);
}

.site-footer-link:hover {
    color: var(--foreground);
}

.site-footer-bottom {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-default);
    font-size: 0.75rem;
    color: var(--foreground-muted);
}

.section-title {
    font-size: clamp(2rem, 3.2vw, 2.7rem);
    line-height: 1.12;
    letter-spacing: -0.02em;
}

.hero-title {
    font-size: clamp(2.3rem, 4.2vw, 3.4rem);
}

.hero-shell {
    padding: 2.25rem;
    background: linear-gradient(135deg, rgba(94, 106, 210, 0.12), rgba(255, 255, 255, 0.02));
}

.hero-preview-stack {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 0.9rem;
    align-items: center;
}

.hero-preview-card {
    min-height: 198px;
}

.hero-preview-label {
    letter-spacing: 0.1em;
}

.hero-preview-body {
    font-size: 0.84rem;
    line-height: 1.45;
}

.hero-preview-meta {
    opacity: 0.85;
}

.hero-preview-arrow {
    color: var(--accent);
    opacity: 0.85;
}

.hero-separator {
    position: relative;
    z-index: 10;
    height: 30px;
    margin-top: -10px;
    background: linear-gradient(to bottom, rgba(94, 106, 210, 0.12), transparent 70%);
}

.donation-widget-wrap {
    width: 100%;
    max-width: 346px;
    border: 1px solid var(--border-default);
    border-radius: 14px;
    overflow: hidden;
    background: var(--background-elevated);
}

.donation-widget-wrap iframe {
    display: block;
    width: 100%;
    border: 0;
}

.donation-widget-frame {
    overflow-y: hidden;
}

#score-progress {
    width: 0%;
}

.donation-btn {
    display: inline-block;
    max-width: 170px;
    height: auto;
}

.donation-btn-dark {
    display: inline-block;
}

.donation-btn-light {
    display: none;
}

:root[data-theme='light'] .donation-btn-dark {
    display: none;
}

:root[data-theme='light'] .donation-btn-light {
    display: inline-block;
}

.analyzer-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 1100px) {
    .analyzer-layout {
        grid-template-columns: minmax(0, 1.35fr) minmax(360px, 0.95fr);
        align-items: stretch;
    }

    #input-card {
        display: flex;
        flex-direction: column;
        height: 100%;
    }

    #prompt-input {
        flex: 1;
        min-height: 360px;
    }

    .analyzer-side {
        position: sticky;
        top: 88px;
    }
}

.workflow-rail {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.5rem;
}

@media (min-width: 768px) {
    .workflow-rail {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

.workflow-step {
    border: 1px solid var(--border-default);
    border-radius: 999px;
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--foreground-muted);
    background: var(--surface);
    text-align: center;
    transition: all var(--duration-fast) var(--ease-expo-out);
}

.workflow-step-active {
    color: #ffffff;
    background: linear-gradient(135deg, var(--accent), var(--accent-bright));
    border-color: transparent;
    box-shadow: 0 8px 20px var(--accent-glow);
}

.workflow-step-complete {
    color: #86efac;
    border-color: rgba(34, 197, 94, 0.35);
    background: rgba(34, 197, 94, 0.1);
}

.top-fix-item {
    border: 1px solid var(--border-default);
    background: rgba(255, 255, 255, 0.04);
    border-radius: 12px;
    padding: 0.875rem;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--foreground);
}

.top-fix-item-success {
    border-color: rgba(34, 197, 94, 0.4);
    background: rgba(34, 197, 94, 0.12);
    color: #bbf7d0;
}

@media (max-width: 768px) {
    .site-header-inner {
        min-height: 60px;
        gap: 0.45rem;
    }

    .site-logo-text {
        display: none;
    }

    .site-nav {
        gap: 0.15rem;
        overflow-x: auto;
    }

    .site-nav::-webkit-scrollbar {
        display: none;
    }

    .site-nav-link {
        font-size: 0.68rem;
        padding: 0.35rem 0.5rem;
        white-space: nowrap;
    }

    .site-header-actions {
        gap: 0.4rem;
    }

    .language-toggle {
        padding: 0.38rem 0.58rem;
        font-size: 0.66rem;
    }

    .language-toggle span:last-child {
        display: none;
    }

    .header-donate-link {
        display: none;
    }

    .theme-toggle {
        padding: 0.45rem 0.7rem;
        font-size: 0.65rem;
        letter-spacing: 0.06em;
    }

    .theme-toggle span:last-child {
        display: none;
    }

    .workflow-rail {
        grid-template-columns: 1fr;
        gap: 0.4rem;
    }

    .workflow-step {
        font-size: 0.65rem;
        padding: 0.45rem 0.6rem;
    }

    #input-card,
    #model-card,
    .analyzer-side .card,
    #results-area .card {
        padding: 1.15rem;
        border-radius: 14px;
    }

    .hero-shell {
        padding: 1.15rem;
    }

    .hero-title {
        font-size: clamp(2rem, 7.8vw, 2.5rem);
    }

    .hero-preview-stack {
        grid-template-columns: 1fr;
    }

    .hero-preview-arrow {
        display: none;
    }

    #toggle-ai-options-btn {
        width: 100%;
    }

    #model-card .flex-wrap {
        width: 100%;
    }

    #model-selector,
    #load-model-btn,
    #upgrade-pro-btn,
    #delete-cache-btn {
        width: 100%;
    }

    #top-fixes-summary {
        font-size: 0.8125rem;
        line-height: 1.45;
    }

    .top-fix-item {
        padding: 0.75rem;
        font-size: 0.8125rem;
    }

    #results-area .grid.grid-cols-1.lg\:grid-cols-2 {
        gap: 1rem;
    }

    #results-area .grid.grid-cols-2.gap-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0.55rem;
    }

    .metric-tile {
        padding: 0.65rem;
    }

    .metric-value {
        font-size: 0.95rem;
    }

    .model-cache-section {
        flex-direction: column;
        align-items: stretch;
    }

    .model-clear-cache-btn,
    .model-retry-btn {
        width: 100%;
    }

    .donation-widget-wrap {
        max-width: 100%;
    }

    .site-footer {
        padding-top: 3rem;
        padding-bottom: 3rem;
        margin-top: 4rem;
    }
}

/* ============================================
   AMBIENT BACKGROUND SYSTEM
   ============================================ */

.ambient-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

/* Layer 1: Radial Gradient Base */
.ambient-background::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at top, #0a0a0f 0%, #050506 50%, #020203 100%);
}

:root[data-theme='light'] .ambient-background::before {
    background: radial-gradient(ellipse at top, #ffffff 0%, #f4f8ff 52%, #edf3ff 100%);
}

:root[data-theme='light'] .ambient-background::after {
    opacity: 0.01;
}

:root[data-theme='light'] .blob-1,
:root[data-theme='light'] .blob-2,
:root[data-theme='light'] .blob-3,
:root[data-theme='light'] .blob-4 {
    opacity: 0.12;
}

/* Layer 2: Noise Texture */
.ambient-background::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.015;
}

/* Animated Gradient Blobs */
.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0;
    animation: float 10s ease-in-out infinite;
}

.blob-1 {
    width: 900px;
    height: 1400px;
    background: var(--accent);
    opacity: 0.25;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    filter: blur(150px);
}

.blob-2 {
    width: 600px;
    height: 800px;
    background: linear-gradient(135deg, #8B5CF6 0%, #EC4899 100%);
    opacity: 0.15;
    top: 200px;
    left: -100px;
    filter: blur(120px);
    animation-delay: -2s;
}

.blob-3 {
    width: 500px;
    height: 700px;
    background: linear-gradient(135deg, #5E6AD2 0%, #3B82F6 100%);
    opacity: 0.12;
    top: 400px;
    right: -150px;
    filter: blur(100px);
    animation-delay: -4s;
}

.blob-4 {
    width: 400px;
    height: 400px;
    background: var(--accent);
    opacity: 0.10;
    bottom: 200px;
    left: 50%;
    transform: translateX(-50%);
    filter: blur(80px);
    animation: pulse 8s ease-in-out infinite;
}

/* Mobile: keep atmosphere but avoid expensive blur layers during first paint. */
@media (max-width: 768px) {
    .site-header {
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
    }

    .ambient-background::after,
    .ambient-background .blob,
    .ambient-background > .absolute {
        display: none !important;
    }

    .ambient-background::before {
        background: linear-gradient(180deg, #0a0a0f 0%, #050506 58%, #020203 100%);
    }

    :root[data-theme='light'] .ambient-background::before {
        background: linear-gradient(180deg, #ffffff 0%, #f4f8ff 60%, #edf3ff 100%);
    }
}

@media (prefers-reduced-motion: reduce) {
    .blob,
    .text-gradient-accent {
        animation: none !important;
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(1deg);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.10;
        transform: translateX(-50%) scale(1);
    }
    50% {
        opacity: 0.15;
        transform: translateX(-50%) scale(1.05);
    }
}



.text-gradient {
    background: linear-gradient(to bottom, #FFFFFF 0%, rgba(255, 255, 255, 0.95) 50%, rgba(255, 255, 255, 0.70) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-gradient-accent {
    background: linear-gradient(90deg, var(--accent) 0%, #818CF8 50%, var(--accent) 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 3s linear infinite;
}

@keyframes shimmer {
    0% {
        background-position: 0% center;
    }
    100% {
        background-position: 200% center;
    }
}

/* ============================================
   COMPONENT STYLES
   ============================================ */

/* Card Component with Glass Effect */
.card {
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
    border: 1px solid var(--border-default);
    border-radius: 16px;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    transition: all var(--duration-normal) var(--ease-expo-out);
    box-shadow: 
        0 0 0 1px rgba(255, 255, 255, 0.06),
        0 2px 20px rgba(0, 0, 0, 0.4),
        0 0 40px rgba(0, 0, 0, 0.2);
}

:root[data-theme='light'] .card {
    background: linear-gradient(to bottom, #ffffff, #f8fbff);
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08), 0 2px 8px rgba(15, 23, 42, 0.04);
}

:root[data-theme='light'] .card:hover {
    box-shadow: 0 16px 34px rgba(15, 23, 42, 0.12), 0 4px 12px rgba(0, 82, 255, 0.08);
}

:root[data-theme='light'] .mode-chip-analysis {
    color: #166534;
    background: rgba(34, 197, 94, 0.16);
    border-color: rgba(22, 101, 52, 0.36);
}

:root[data-theme='light'] .mode-chip-rewrite {
    color: #1d4ed8;
    background: rgba(0, 82, 255, 0.14);
    border-color: rgba(29, 78, 216, 0.35);
}

:root[data-theme='light'] .issue-icon {
    color: #b45309;
}

:root[data-theme='light'] .workflow-step {
    background: #ffffff;
    border-color: var(--border-default);
}

:root[data-theme='light'] .workflow-step-active {
    color: #ffffff;
}

:root[data-theme='light'] .workflow-step-complete {
    color: #166534;
    border-color: rgba(22, 101, 52, 0.35);
    background: rgba(34, 197, 94, 0.14);
}

:root[data-theme='light'] .top-fix-item {
    background: #ffffff;
    border-color: var(--border-default);
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.06);
}

:root[data-theme='light'] .top-fix-item-success {
    color: #166534;
    border-color: rgba(22, 101, 52, 0.35);
    background: rgba(34, 197, 94, 0.12);
}

:root[data-theme='light'] .metric-tile {
    background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
    border-color: var(--border-default);
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05);
}

:root[data-theme='light'] .hero-shell {
    background: linear-gradient(135deg, rgba(0, 82, 255, 0.08), rgba(255, 255, 255, 0.92));
}

:root[data-theme='light'] .hero-separator {
    background: linear-gradient(to bottom, rgba(0, 82, 255, 0.12), transparent 72%);
}

:root[data-theme='light'] .metric-tile:hover {
    border-color: var(--border-hover);
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.1);
}

:root[data-theme='light'] #score-progress {
    box-shadow: 0 0 0 1px rgba(0, 82, 255, 0.14) inset;
}

:root[data-theme='light'] #issues-list li.text-emerald-400 {
    color: #166534 !important;
}

:root[data-theme='light'] #issues-list li .text-orange-500 {
    color: #b45309 !important;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

.card:hover {
    border-color: var(--border-hover);
    box-shadow: 
        0 0 0 1px rgba(255, 255, 255, 0.1),
        0 8px 40px rgba(0, 0, 0, 0.5),
        0 0 80px rgba(94, 106, 210, 0.1);
    transform: translateY(-4px);
}

/* Mouse-tracking Spotlight Effect */
.spotlight-card {
    position: relative;
}

.spotlight-card::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-fast) var(--ease-out);
    transform: translate(-50%, -50%);
}

.spotlight-card:hover::after {
    opacity: 0.15;
}

/* Primary Button with Glow */
.btn-primary {
    background: var(--accent);
    color: white;
    font-weight: 600;
    padding: 1rem 2rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all var(--duration-fast) var(--ease-expo-out);
    box-shadow: 
        0 0 0 1px rgba(94, 106, 210, 0.5),
        0 4px 12px rgba(94, 106, 210, 0.3),
        inset 0 1px 0 0 rgba(255, 255, 255, 0.2);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--duration-slow) var(--ease-expo-out);
}

.btn-primary:hover {
    background: var(--accent-bright);
    box-shadow: 
        0 0 0 1px rgba(94, 106, 210, 0.6),
        0 6px 20px rgba(94, 106, 210, 0.4),
        inset 0 1px 0 0 rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.btn-primary:active {
    scale: 0.98;
    box-shadow: 
        0 0 0 1px rgba(94, 106, 210, 0.4),
        0 2px 8px rgba(94, 106, 210, 0.2),
        inset 0 1px 0 0 rgba(255, 255, 255, 0.1);
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:active {
    transform: translateY(0) scale(0.98);
    box-shadow: 
        0 0 0 1px rgba(94, 106, 210, 0.5),
        0 2px 8px rgba(94, 106, 210, 0.3);
}

/* Secondary Button */
.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--foreground);
    font-weight: 600;
    padding: 1rem 2rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    position: relative;
    transition: all var(--duration-fast) var(--ease-expo-out);
    box-shadow: 
        inset 0 0 0 1px rgba(255, 255, 255, 0.06);
}

:root[data-theme='light'] .btn-secondary {
    background: #ffffff;
    box-shadow: inset 0 0 0 1px var(--border-default);
}

:root[data-theme='light'] .btn-secondary:hover {
    background: #f8fbff;
    box-shadow: inset 0 0 0 1px var(--border-hover), 0 6px 20px rgba(15, 23, 42, 0.08);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 
        inset 0 0 0 1px rgba(255, 255, 255, 0.1),
        0 0 20px rgba(255, 255, 255, 0.05);
    transform: translateY(-2px);
}

.btn-secondary:active {
    transform: translateY(0) scale(0.98);
}

/* Input Fields */
.input-field {
    width: 100%;
    padding: 1.5rem;
    background: #0F0F12;
    border: 1px solid rgba(255, 255, 255, 0.10);
    border-radius: 8px;
    color: var(--foreground);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    resize: vertical;
    transition: all var(--duration-normal) var(--ease-expo-out);
}

:root[data-theme='light'] .input-field {
    background: #ffffff;
    border-color: var(--border-default);
    color: var(--foreground);
}

:root[data-theme='light'] .input-field::placeholder {
    color: var(--foreground-muted);
    opacity: 0.75;
}

:root[data-theme='light'] .themed-select {
    background: #ffffff !important;
    border-color: var(--border-default) !important;
    color: var(--foreground) !important;
}

:root[data-theme='light'] #hero-section h1,
:root[data-theme='light'] #hero-section p,
:root[data-theme='light'] #hero-section li,
:root[data-theme='light'] #hero-section span {
    color: var(--foreground);
}

:root[data-theme='light'] #analyzer,
:root[data-theme='light'] main,
:root[data-theme='light'] footer {
    color: var(--foreground);
}

:root[data-theme='light'] #improved-prompt {
    background: #ffffff !important;
    color: var(--foreground) !important;
    border-color: var(--border-default) !important;
}

:root[data-theme='light'] #results-area [id^='ui-metric-'],
:root[data-theme='light'] #results-area #ui-qualityScore,
:root[data-theme='light'] #results-area #ui-optimizedVersion,
:root[data-theme='light'] #results-area #role-score,
:root[data-theme='light'] #results-area #output-score,
:root[data-theme='light'] #results-area #constraints-score,
:root[data-theme='light'] #results-area #context-score,
:root[data-theme='light'] #results-area #completeness-score,
:root[data-theme='light'] #results-area #consistency-score,
:root[data-theme='light'] #ui-issuesTitle {
    color: var(--foreground) !important;
}

:root[data-theme='light'] #issues-list,
:root[data-theme='light'] #model-info,
:root[data-theme='light'] #progress-text {
    color: var(--foreground-muted) !important;
}

:root[data-theme='light'] footer {
    background: rgba(255, 255, 255, 0.72) !important;
    border-top-color: var(--border-default) !important;
}

.input-field::placeholder {
    color: var(--foreground-muted);
    opacity: 0.5;
}

.input-field:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 
        0 0 0 3px rgba(94, 106, 210, 0.1),
        0 0 20px rgba(94, 106, 210, 0.2);
}

/* Spinner */
.spinner {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   ADDITIONAL ENHANCEMENTS
   ============================================ */

/* Smooth Scroll Behavior */
html {
    scroll-behavior: smooth;
}

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

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

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* Selection Color */
::selection {
    background: rgba(94, 106, 210, 0.3);
    color: white;
}

/* Optimized Transitions */
.card,
.btn-primary,
.btn-secondary,
.input-field {
    will-change: transform, box-shadow;
}

/* Mobile Touch Improvements */
@media (hover: none) and (pointer: coarse) {
    .card:hover,
    .btn-primary:hover,
    .btn-secondary:hover {
        transform: none;
    }
    
    .spotlight-card::after {
        display: none;
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .card {
        border-width: 0.5px;
    }
}

/* Print Styles */
@media print {
    .ambient-background,
    .grid-overlay,
    .blob {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}

/* Loading State Shimmer */
@keyframes loading-shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

.loading-shimmer {
    background: linear-gradient(90deg, 
        rgba(255, 255, 255, 0.05) 0%, 
        rgba(255, 255, 255, 0.1) 50%, 
        rgba(255, 255, 255, 0.05) 100%);
    background-size: 200% 100%;
    animation: loading-shimmer 1.5s infinite;
}

/* Glow Pulse for Active States */
@keyframes glow-pulse {
    0%, 100% {
        box-shadow: 0 0 20px rgba(94, 106, 210, 0.3);
    }
    50% {
        box-shadow: 0 0 30px rgba(94, 106, 210, 0.5);
    }
}

.glow-active {
    animation: glow-pulse 2s ease-in-out infinite;
}

/* Backdrop Blur for Modals/Overlays */
.backdrop-blur-linear {
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    backdrop-filter: blur(12px) saturate(180%);
}

/* Gradient Border Animation */
@keyframes gradient-border {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

.gradient-border {
    position: relative;
}

/* ============================================
   MODEL STATUS UI (Token-based)
   ============================================ */

.model-status-container {
    padding: 1.25rem;
}

.model-progress-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.model-progress-bar-container {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-default);
    border-radius: 999px;
    overflow: hidden;
}

.model-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #818CF8);
    transition: width var(--duration-normal) var(--ease-expo-out);
}

.model-progress-text {
    font-size: 0.875rem;
    color: var(--foreground-muted);
}

.model-source-info {
    font-size: 0.75rem;
    color: var(--foreground-subtle);
    font-family: var(--font-mono);
}

.model-status-message {
    margin-top: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    font-size: 0.875rem;
    border: 1px solid var(--border-default);
    background: rgba(255, 255, 255, 0.03);
}

.model-status-message.status-info {
    color: #A5B4FC;
    border-color: rgba(99, 102, 241, 0.4);
    background: rgba(99, 102, 241, 0.12);
}

.model-status-message.status-warning {
    color: #FCD34D;
    border-color: rgba(245, 158, 11, 0.4);
    background: rgba(245, 158, 11, 0.12);
}

.model-status-message.status-error {
    color: #FCA5A5;
    border-color: rgba(239, 68, 68, 0.45);
    background: rgba(239, 68, 68, 0.12);
}

.model-status-message.status-success {
    color: #86EFAC;
    border-color: rgba(34, 197, 94, 0.4);
    background: rgba(34, 197, 94, 0.12);
}

.fallback-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    font-size: 0.875rem;
    color: #FCD34D;
    border: 1px solid rgba(245, 158, 11, 0.4);
    background: rgba(245, 158, 11, 0.12);
}

.model-error-container {
    margin-top: 0.75rem;
    padding: 0.875rem 1rem;
    border-radius: 10px;
    border: 1px solid rgba(239, 68, 68, 0.45);
    background: rgba(239, 68, 68, 0.12);
}

.model-error-message {
    color: #FCA5A5;
    font-size: 0.875rem;
}

.model-retry-btn {
    margin-top: 0.75rem;
}

.model-cache-section {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-default);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    justify-content: space-between;
    flex-wrap: wrap;
}

.model-cache-info {
    font-size: 0.8125rem;
    color: var(--foreground-muted);
}

.model-clear-cache-btn {
    padding: 0.625rem 0.875rem;
    font-size: 0.8125rem;
}

.gradient-border::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, 
        var(--accent) 0%, 
        transparent 50%, 
        var(--accent) 100%);
    background-size: 200% 200%;
    -webkit-mask: 
        linear-gradient(#fff 0 0) content-box, 
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask: 
        linear-gradient(#fff 0 0) content-box, 
        linear-gradient(#fff 0 0);
    mask-composite: exclude;
    animation: gradient-border 3s ease infinite;
    opacity: 0;
    transition: opacity var(--duration-normal) var(--ease-expo-out);
}

.gradient-border:hover::before {
    opacity: 1;
}

/* Improved Focus Visible */
.focus-ring:focus-visible {
    outline: none;
    box-shadow: 
        0 0 0 2px var(--background-base),
        0 0 0 4px var(--accent);
}

/* Smooth Image Loading */
img {
    opacity: 1;
    transition: opacity var(--duration-normal) var(--ease-out);
}

img[data-loading="true"] {
    opacity: 0;
}

/* Better Text Rendering */
body {
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Ensure proper z-index layering */
.z-background { z-index: 0; }
.z-content { z-index: 10; }
.z-overlay { z-index: 20; }
.z-modal { z-index: 30; }
.z-tooltip { z-index: 40; }

/* Staggered Reveal Initial State */
.stagger-reveal-initial {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity var(--duration-slow) var(--ease-expo-out), transform var(--duration-slow) var(--ease-expo-out);
}

.animate-in {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */

/* ============================================
   Loading Dots Animation
   ============================================ */

.loading-dots::after {
    content: '...';
    display: inline-block;
    animation: blink-dots 1.5s infinite;
}

@keyframes blink-dots {
    0% { content: '.'; }
    33% { content: '..'; }
    66% { content: '...'; }
}