/* =============================================
   PolyPredict — Premium CSS Design System
   ============================================= */

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --surface: rgba(255, 255, 255, 0.03);
    --surface-hover: rgba(255, 255, 255, 0.06);
    --border: rgba(255, 255, 255, 0.08);
    --border-focus: rgba(99, 102, 241, 0.5);
    --text-primary: #f0f0f5;
    --text-secondary: #8b8b9e;
    --text-muted: #5a5a6e;
    --accent-start: #6366f1;
    --accent-end: #a855f7;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --success: #22c55e;
    --error: #ef4444;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* =============================================
   Animated Background Orbs
   ============================================= */
.bg-orbs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    top: -150px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #a855f7, #ec4899);
    bottom: -100px;
    left: -100px;
    animation-delay: -7s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #3b82f6, #6366f1);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -40px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(40px, 30px) scale(1.02); }
}

/* =============================================
   Navbar
   ============================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 32px;
    background: rgba(10, 10, 15, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

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

.brand-icon {
    font-size: 20px;
    background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-text {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--text-primary);
}

.nav-badge {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    padding: 5px 14px;
    border-radius: 100px;
    background: var(--accent-glow);
    color: var(--accent-start);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* =============================================
   Main Container
   ============================================= */
.main-container {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
    padding-top: 80px;
}

/* =============================================
   Hero Section
   ============================================= */
.hero {
    text-align: center;
    padding: 80px 0 60px;
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

.hero-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-start);
    margin-bottom: 20px;
    padding: 6px 16px;
    background: var(--accent-glow);
    border-radius: 100px;
    border: 1px solid rgba(99, 102, 241, 0.15);
}

.hero-title {
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -1.5px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-start), var(--accent-end), #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
    font-weight: 400;
}

/* =============================================
   Glass Card
   ============================================= */
.glass-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: border-color var(--transition-smooth);
}

.glass-card:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

/* =============================================
   Prediction Card
   ============================================= */
.prediction-section {
    margin-bottom: 60px;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.prediction-card {
    padding: 40px;
}

.card-header {
    text-align: center;
    margin-bottom: 36px;
}

.card-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
    color: white;
    margin-bottom: 16px;
}

.card-title {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
}

.card-description {
    font-size: 14px;
    color: var(--text-secondary);
}

/* =============================================
   Form Styles
   ============================================= */
.predict-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.input-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper input {
    width: 100%;
    padding: 16px 70px 16px 20px;
    font-size: 18px;
    font-weight: 500;
    font-family: var(--font-family);
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    outline: none;
    transition: all var(--transition-fast);
    -moz-appearance: textfield;
}

.input-wrapper input::-webkit-inner-spin-button,
.input-wrapper input::-webkit-outer-spin-button {
    -webkit-appearance: none;
}

.input-wrapper input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

.input-wrapper input::placeholder {
    color: var(--text-muted);
}

.input-unit {
    position: absolute;
    right: 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    pointer-events: none;
}

/* Range Slider */
.input-range {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--text-muted);
}

.input-range input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.input-range input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
    transition: transform var(--transition-fast);
}

.input-range input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Predict Button */
.btn-predict {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 16px 32px;
    font-size: 16px;
    font-weight: 600;
    font-family: var(--font-family);
    color: white;
    background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn-predict::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.btn-predict:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

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

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

.btn-predict:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-arrow {
    transition: transform var(--transition-fast);
}

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

.spinner {
    animation: spin 1s linear infinite;
}

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

/* =============================================
   Result Display
   ============================================= */
.result-container {
    margin-top: 32px;
    animation: fadeInUp 0.5s var(--transition-spring);
}

.result-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
    margin-bottom: 32px;
}

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

.result-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.result-value {
    font-size: clamp(36px, 5vw, 48px);
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(135deg, var(--success), #4ade80);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: countUp 0.6s ease-out;
}

.result-meta {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 8px;
}

@keyframes countUp {
    from { opacity: 0; transform: translateY(20px) scale(0.9); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Error Display */
.error-container {
    margin-top: 24px;
    padding: 16px 20px;
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: shake 0.4s ease-in-out;
}

.error-icon {
    font-size: 18px;
}

.error-text {
    font-size: 14px;
    color: var(--error);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

/* =============================================
   Info Cards
   ============================================= */
.info-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 60px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.info-card {
    padding: 28px 24px;
    text-align: center;
    transition: all var(--transition-smooth);
}

.info-card:hover {
    transform: translateY(-4px);
    background: var(--surface-hover);
}

.info-icon {
    font-size: 32px;
    margin-bottom: 14px;
    display: block;
}

.info-card h3 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.3px;
}

.info-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* =============================================
   Footer
   ============================================= */
.footer {
    text-align: center;
    padding: 40px 0;
    border-top: 1px solid var(--border);
}

.footer p {
    font-size: 13px;
    color: var(--text-muted);
}

/* =============================================
   Animations
   ============================================= */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =============================================
   Responsive
   ============================================= */
@media (max-width: 768px) {
    .navbar {
        padding: 14px 20px;
    }

    .main-container {
        padding: 0 16px;
        padding-top: 70px;
    }

    .hero {
        padding: 50px 0 40px;
    }

    .prediction-card {
        padding: 28px 20px;
    }

    .info-section {
        grid-template-columns: 1fr;
        gap: 12px;
    }
}