/* ════════════════════════════════════════════════════════════════════════════
   Employee Burnout Predictor — Premium Dark Theme
   ════════════════════════════════════════════════════════════════════════════ */

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

:root {
    --bg-primary: #0a0a0f;
    --bg-card: rgba(18, 18, 28, 0.85);
    --bg-card-border: rgba(255, 255, 255, 0.06);
    --bg-input: rgba(255, 255, 255, 0.04);

    --text-primary: #f0f0f5;
    --text-secondary: rgba(240, 240, 245, 0.6);
    --text-muted: rgba(240, 240, 245, 0.35);

    --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a855f7);
    --accent-solid: #8b5cf6;

    --risk-low: #22c55e;
    --risk-medium: #eab308;
    --risk-high: #f97316;
    --risk-critical: #ef4444;

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    --shadow-glow: 0 0 60px rgba(139, 92, 246, 0.15);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
}

/* ── Background Glow ────────────────────────────────────────────────────────── */
.bg-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    pointer-events: none;
    z-index: 0;
}
.bg-glow--1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.3), transparent 70%);
    top: -150px;
    left: -100px;
}
.bg-glow--2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.2), transparent 70%);
    bottom: -100px;
    right: -80px;
}

/* ── Container ──────────────────────────────────────────────────────────────── */
.container {
    position: relative;
    z-index: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: 3rem 1.5rem 2rem;
}

/* ── Hero ────────────────────────────────────────────────────────────────────── */
.hero {
    text-align: center;
    margin-bottom: 2.5rem;
    animation: fadeInUp 0.8s ease-out;
}

.hero__badge {
    display: inline-block;
    padding: 0.35rem 1rem;
    background: var(--accent-gradient);
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #fff;
    margin-bottom: 1.25rem;
}

.hero__title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
}

.hero__highlight {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ── Prediction Card ────────────────────────────────────────────────────────── */
.prediction-card {
    animation: fadeInUp 0.8s ease-out 0.15s both;
}

.prediction-card__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    box-shadow: var(--shadow-glow);
}

@media (max-width: 768px) {
    .prediction-card__inner {
        grid-template-columns: 1fr;
        padding: 1.5rem;
        border-radius: var(--radius-lg);
    }
}

/* ── Form Section ───────────────────────────────────────────────────────────── */
.form-section__title,
.results-section__title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 1.75rem;
}

/* ── Input Groups ───────────────────────────────────────────────────────────── */
.input-group {
    margin-bottom: 1.5rem;
}

.input-group__label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.input-group__label-text {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
}

.input-group__value {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-solid);
    background: rgba(139, 92, 246, 0.1);
    padding: 0.15rem 0.6rem;
    border-radius: var(--radius-sm);
    min-width: 2.5rem;
    text-align: center;
}

/* ── Slider Styling ─────────────────────────────────────────────────────────── */
.input-group__slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-input);
    border-radius: 100px;
    outline: none;
    cursor: pointer;
    transition: var(--transition);
}

.input-group__slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-solid);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.4);
    cursor: pointer;
    transition: var(--transition);
}

.input-group__slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.6);
}

.input-group__slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-solid);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.4);
    cursor: pointer;
}

.input-group__range {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
}

/* ── Toggle Switches ────────────────────────────────────────────────────────── */
.toggles-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

@media (max-width: 768px) {
    .toggles-row {
        grid-template-columns: 1fr;
    }
}

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

.toggle-group__label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 100%;
}

.toggle-switch__input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-switch__track {
    display: flex;
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    overflow: hidden;
    transition: var(--transition);
}

.toggle-switch__option {
    flex: 1;
    padding: 0.5rem 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
    text-align: center;
    color: var(--text-muted);
    transition: var(--transition);
    border-radius: calc(var(--radius-sm) - 1px);
}

/* Left option active when unchecked */
.toggle-switch__input:not(:checked) ~ .toggle-switch__track .toggle-switch__option--left {
    background: var(--accent-gradient);
    color: #fff;
}

/* Right option active when checked */
.toggle-switch__input:checked ~ .toggle-switch__track .toggle-switch__option--right {
    background: var(--accent-gradient);
    color: #fff;
}

/* ── Predict Button ─────────────────────────────────────────────────────────── */
.btn-predict {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.9rem 1.5rem;
    background: var(--accent-gradient);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-predict::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
    opacity: 0;
    transition: var(--transition);
}

.btn-predict:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(139, 92, 246, 0.35);
}

.btn-predict:hover::before {
    opacity: 1;
}

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

.btn-predict__icon {
    font-size: 1.2rem;
    transition: var(--transition);
}

.btn-predict:hover .btn-predict__icon {
    transform: translateX(4px);
}

/* ── Results Section ────────────────────────────────────────────────────────── */
.results-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* ── Gauge ──────────────────────────────────────────────────────────────────── */
.gauge-container {
    position: relative;
    width: 200px;
    height: 120px;
    margin-bottom: 1rem;
}

.gauge {
    width: 100%;
    height: 100%;
}

.gauge__fill {
    transition: stroke-dashoffset 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.gauge__center {
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    display: flex;
    align-items: baseline;
    gap: 2px;
}

.gauge__value {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.gauge__unit {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* ── Risk Badge ─────────────────────────────────────────────────────────────── */
.risk-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--bg-card-border);
    border-radius: 100px;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.risk-badge__dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: var(--transition);
}

.risk-badge__text {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    transition: var(--transition);
}

/* Risk Level Colors */
.risk-badge--low .risk-badge__dot { background: var(--risk-low); box-shadow: 0 0 8px var(--risk-low); }
.risk-badge--low .risk-badge__text { color: var(--risk-low); }

.risk-badge--medium .risk-badge__dot { background: var(--risk-medium); box-shadow: 0 0 8px var(--risk-medium); }
.risk-badge--medium .risk-badge__text { color: var(--risk-medium); }

.risk-badge--high .risk-badge__dot { background: var(--risk-high); box-shadow: 0 0 8px var(--risk-high); }
.risk-badge--high .risk-badge__text { color: var(--risk-high); }

.risk-badge--critical .risk-badge__dot { background: var(--risk-critical); box-shadow: 0 0 8px var(--risk-critical); }
.risk-badge--critical .risk-badge__text { color: var(--risk-critical); }

/* ── Result Description ─────────────────────────────────────────────────────── */
.results-section__description {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.6;
    max-width: 260px;
}

/* ── Model Info Footer ──────────────────────────────────────────────────────── */
.model-info {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    margin-top: 2rem;
    padding: 1.25rem 0;
    border-top: 1px solid var(--bg-card-border);
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

@media (max-width: 768px) {
    .model-info {
        flex-wrap: wrap;
        gap: 1rem;
    }
}

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

.model-info__label {
    display: block;
    font-size: 0.65rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.model-info__value {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ── Animations ─────────────────────────────────────────────────────────────── */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}