/* ==========================================
   DESIGN SYSTEM & CUSTOM VARIABLES
   ========================================== */
:root {
    --bg-dark: #080a10;
    --bg-surface: rgba(15, 18, 28, 0.7);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.16);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Base theme hue (default purple, overrides dynamically in cards/panels) */
    --accent-hue: 260; 
    --color-accent: hsl(var(--accent-hue), 85%, 58%);
    --color-accent-glow: hsla(var(--accent-hue), 85%, 58%, 0.15);
    --color-accent-border: hsla(var(--accent-hue), 85%, 58%, 0.25);
    --color-accent-deep: hsl(var(--accent-hue), 80%, 45%);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
    --glass-blur: blur(20px);
    
    --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================
   RESET & LAYOUT FOUNDATIONS
   ========================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Background floating glow blobs */
.glow-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.glow-sphere {
    position: absolute;
    border-radius: 50%;
    filter: blur(140px);
    opacity: 0.25;
    mix-blend-mode: screen;
    animation: float-glow 25s infinite alternate;
}

.sphere-1 {
    top: -10%;
    right: 10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.8) 0%, rgba(0,0,0,0) 70%);
}

.sphere-2 {
    bottom: -10%;
    left: 10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(236, 72, 153, 0.7) 0%, rgba(0,0,0,0) 70%);
    animation-duration: 35s;
    animation-delay: -5s;
}

.sphere-3 {
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, rgba(20, 184, 166, 0.6) 0%, rgba(0,0,0,0) 70%);
    animation-duration: 30s;
    animation-delay: -10s;
}

@keyframes float-glow {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(80px, 50px) scale(1.2); }
}

/* ==========================================
   TYPOGRAPHY
   ========================================== */
h1, h2, h3, h4, h5 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h1 {
    font-size: 2.8rem;
    line-height: 1.2;
    background: linear-gradient(135deg, #ffffff 30%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

p {
    color: var(--text-secondary);
}

/* ==========================================
   COMPONENTS: APP HEADER & FOOTER
   ========================================== */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2.5rem;
    background: rgba(10, 12, 22, 0.5);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
}

.logo-icon {
    color: var(--color-accent);
    filter: drop-shadow(0 0 8px var(--color-accent-border));
    transition: transform var(--transition-fast);
}

.header-logo:hover .logo-icon {
    transform: rotate(15deg) scale(1.1);
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo-accent {
    color: var(--color-accent);
}

.nav-status-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: #10b981;
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.2);
    padding: 0.35rem 0.75rem;
    border-radius: 100px;
}

.status-indicator-dot {
    width: 6px;
    height: 6px;
    background-color: #10b981;
    border-radius: 50%;
    box-shadow: 0 0 8px #10b981;
    animation: pulse 1.8s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.9); opacity: 0.6; }
    50% { transform: scale(1.2); opacity: 1; box-shadow: 0 0 12px #10b981; }
    100% { transform: scale(0.9); opacity: 0.6; }
}

.app-footer {
    text-align: center;
    padding: 2.5rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: auto;
}

/* ==========================================
   WORKSPACE & GENERAL PANELS
   ========================================== */
.app-workspace {
    flex: 1;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 3rem 2rem;
    position: relative;
}

.view-section {
    display: none;
    opacity: 0;
    transform: translateY(15px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.view-section.active-view {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================
   VIEW: HOME DASHBOARD GRID
   ========================================== */
.hero-section {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3.5rem auto;
}

.hero-subtitle {
    margin-top: 1rem;
    font-size: 1.1rem;
    line-height: 1.5;
}

.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    padding: 0.5rem;
}

/* Glowing Interactive Cards */
.model-card {
    position: relative;
    background: var(--bg-surface);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    cursor: pointer;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.model-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.model-card:hover {
    transform: translateY(-6px);
    border-color: var(--color-accent-border);
    box-shadow: var(--shadow-lg), 0 10px 30px var(--color-accent-glow);
}

.model-card:hover::before {
    transform: scaleX(1);
}

/* Radial hover glow element */
.card-glow {
    position: absolute;
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 60%);
    top: -100px;
    right: -100px;
    pointer-events: none;
    opacity: 0.4;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.model-card:hover .card-glow {
    opacity: 1;
    transform: scale(1.15);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-icon-wrapper {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    background: hsla(var(--accent-hue), 85%, 58%, 0.1);
    border: 1px solid var(--color-accent-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
}

.card-badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.65rem;
    border-radius: 100px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.type-classification {
    color: #f43f5e;
    background: rgba(244, 63, 94, 0.08);
    border: 1px solid rgba(244, 63, 94, 0.15);
}

.type-clustering {
    color: #a855f7;
    background: rgba(168, 85, 247, 0.08);
    border: 1px solid rgba(168, 85, 247, 0.15);
}

.type-nlp {
    color: #06b6d4;
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.15);
}

.type-regression {
    color: #eab308;
    background: rgba(234, 179, 8, 0.08);
    border: 1px solid rgba(234, 179, 8, 0.15);
}

.type-forecasting {
    color: #14b8a6;
    background: rgba(20, 184, 166, 0.08);
    border: 1px solid rgba(20, 184, 166, 0.15);
}

.model-card h3 {
    font-size: 1.35rem;
}

.card-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
    flex-grow: 1;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.5rem;
}

.status-tag {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.status-tag::before {
    content: '';
    width: 8px;
    height: 8px;
    background-color: #10b981;
    border-radius: 50%;
    display: inline-block;
}

.btn {
    font-family: var(--font-heading);
    font-weight: 600;
    cursor: pointer;
    border-radius: 12px;
    outline: none;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.btn-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.model-card:hover .btn-card {
    background: var(--color-accent);
    border-color: var(--color-accent);
    box-shadow: 0 4px 15px var(--color-accent-glow);
}

/* ==========================================
   VIEW: PREDICTOR INTERACTION WORKSPACE
   ========================================== */
.back-nav-container {
    margin-bottom: 2rem;
}

.btn-back {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.btn-back:hover {
    color: var(--color-accent);
    transform: translateX(-4px);
}

.predictor-header {
    margin-bottom: 3rem;
}

.predictor-header h2 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

.workspace-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

@media (max-width: 992px) {
    .workspace-grid {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--bg-surface);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.panel-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-header h3 {
    font-size: 1.2rem;
}

.tag {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.65rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.tag-accent {
    color: var(--color-accent);
    border-color: var(--color-accent-border);
    background: var(--color-accent-glow);
}

.panel-body {
    padding: 2rem;
}

/* ==========================================
   INTERACTIVE FORM STYLING
   ========================================== */
.model-form-fields {
    display: none;
    flex-direction: column;
    gap: 1.5rem;
}

.model-form-fields.active-fields {
    display: flex;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-row {
    display: flex;
    gap: 1.5rem;
}

.col-6 {
    flex: 1;
}

.field-label {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.val-display {
    color: var(--color-accent);
    background: var(--color-accent-glow);
    padding: 0.15rem 0.5rem;
    border-radius: 6px;
    font-family: monospace;
    font-size: 0.85rem;
    border: 1px solid var(--color-accent-border);
}

.form-control {
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.85rem 1rem;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

select.form-control {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.1rem;
    padding-right: 2.5rem;
}

.txt-area {
    resize: none;
    line-height: 1.5;
}

.field-help {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Sleek Slider Styling */
.form-range {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    margin: 10px 0;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 3px solid var(--bg-dark);
    cursor: pointer;
    box-shadow: 0 0 12px var(--color-accent-deep);
    transition: transform var(--transition-fast);
}

.form-range::-webkit-slider-thumb:hover {
    transform: scale(1.25);
}

.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Sample texts bar */
.sample-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: -0.5rem;
}

.sample-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.btn-sample {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.25rem 0.65rem;
    font-size: 0.75rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.btn-sample:hover {
    border-color: var(--color-accent-border);
    background: var(--color-accent-glow);
    color: var(--text-primary);
}

.asset-section-divider {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin: 1rem 0 0.5rem 0;
}

.form-submit-container {
    margin-top: 2.5rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

.btn-primary {
    background: var(--color-accent);
    border: 1px solid var(--color-accent);
    color: #ffffff;
    box-shadow: 0 4px 15px var(--color-accent-glow);
    padding: 0.85rem 2rem;
    font-size: 1rem;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    background: var(--color-accent-deep);
    border-color: var(--color-accent-deep);
    box-shadow: 0 6px 20px var(--color-accent-glow);
    transform: translateY(-2px);
}

.submit-icon {
    transition: transform var(--transition-fast);
}

.btn-primary:hover .submit-icon {
    transform: translate(2px, -2px);
}

/* Spinner */
.spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #ffffff;
    animation: spin 0.8s linear infinite;
}

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

/* ==========================================
   RESULTS PANEL STYLING
   ========================================== */
.results-panel {
    min-height: 480px;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
}

.empty-state, .loading-state {
    text-align: center;
    max-width: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.empty-icon-wrapper {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.empty-state h4, .loading-state h4 {
    font-size: 1.15rem;
}

.empty-state p, .loading-state p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Pulse animation loader */
.circle-loader {
    width: 60px;
    height: 60px;
    border: 3px solid var(--color-accent-glow);
    border-radius: 50%;
    border-top-color: var(--color-accent);
    animation: spin 1s cubic-bezier(0.55, 0.25, 0.25, 0.7) infinite;
}

.hidden {
    display: none !important;
}

/* RESULT CONTENT CARD styling */
.prediction-highlight-card {
    background: radial-gradient(circle at top left, rgba(255, 255, 255, 0.03) 0%, transparent 60%);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.75rem;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.prediction-highlight-card::after {
    content: '';
    position: absolute;
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 75%);
    bottom: -75px;
    right: -75px;
}

.pred-label {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.75rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-muted);
}

.pred-value {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 2.2rem;
    line-height: 1.2;
    color: var(--color-accent);
    text-shadow: 0 0 15px var(--color-accent-border);
}

.confidence-container {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.confidence-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.confidence-bar-bg {
    height: 8px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 100px;
    overflow: hidden;
}

.confidence-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent-deep), var(--color-accent));
    border-radius: 100px;
    width: 0;
    transition: width var(--transition-slow);
}

/* User friendly Explanation card */
.explanation-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card-section-title {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    color: var(--text-primary);
}

.explanation-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Probability Bar Chart for News Classification */
.prob-bar-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 0.5rem;
}

.prob-row {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.prob-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    font-weight: 500;
}

.prob-bar-bg {
    height: 6px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 100px;
    overflow: hidden;
}

.prob-bar-fill {
    height: 100%;
    background: var(--color-accent);
    border-radius: 100px;
    width: 0;
    transition: width var(--transition-normal);
}

/* Advanced JSON Details Accordion */
.tech-details-details {
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.tech-details-summary {
    padding: 1rem;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    transition: background-color var(--transition-fast);
}

.tech-details-summary:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

.tech-details-summary::-webkit-details-marker {
    display: none;
}

.accordion-arrow {
    font-size: 0.65rem;
    transition: transform var(--transition-fast);
}

.tech-details-details[open] .accordion-arrow {
    transform: rotate(180deg);
}

.tech-details-content {
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    max-height: 250px;
    overflow-y: auto;
}

.tech-details-content pre {
    margin: 0;
}

.tech-details-content code {
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: pre-wrap;
    word-break: break-all;
}