/* FitBuddy.fun - Liquid Glass Design System */

/* ==================== CSS VARIABLES ==================== */
:root {
    /* Fitness Theme Colors - Energetic Orange & Green Gradients */
    --primary-gradient: linear-gradient(135deg, #FF6B35 0%, #F7931E 100%);
    --secondary-gradient: linear-gradient(135deg, #52C69D 0%, #6FE3B8 100%);
    --accent-gradient: linear-gradient(135deg, #FF6B35 0%, #52C69D 100%);
    
    /* Glass Effect Colors */
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: rgba(0, 0, 0, 0.1);
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.8);
    --text-tertiary: rgba(255, 255, 255, 0.6);
    
    /* Background */
    --bg-dark: #0a0a0a;
    --bg-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius - Only 2 Values Allowed */
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ==================== GLOBAL RESET ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-gradient);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* ==================== FLOATING BACKGROUND SHAPES ==================== */
.bg-shape {
    position: fixed;
    border-radius: var(--radius-full);
    z-index: 0;
    pointer-events: none;
    filter: blur(80px);
    opacity: 0.3;
}

.shape-1 {
    width: 500px;
    height: 500px;
    background: var(--primary-gradient);
    top: -100px;
    left: -100px;
    animation: float 20s ease-in-out infinite;
}

.shape-2 {
    width: 400px;
    height: 400px;
    background: var(--secondary-gradient);
    top: 30%;
    right: -100px;
    animation: float 25s ease-in-out infinite reverse;
}

.shape-3 {
    width: 350px;
    height: 350px;
    background: var(--accent-gradient);
    bottom: 10%;
    left: 10%;
    animation: float 22s ease-in-out infinite;
}

.shape-4 {
    width: 300px;
    height: 300px;
    background: var(--primary-gradient);
    bottom: -50px;
    right: 20%;
    animation: float 18s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

/* ==================== NAVIGATION ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    backdrop-filter: blur(20px) saturate(180%);
    background: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 4px 30px var(--glass-shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
}

.logo-icon {
    font-size: 1.8rem;
}

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

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s var(--transition-smooth);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: width 0.3s var(--transition-smooth);
    border-radius: var(--radius-full);
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link:hover::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    transition: all 0.3s var(--transition-smooth);
}

/* ==================== CONTAINER & SECTIONS ==================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    position: relative;
    z-index: 1;
}

section {
    padding: var(--spacing-2xl) 0;
    position: relative;
    z-index: 1;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ==================== HERO SECTION ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

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

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-2xl);
}

.btn {
    padding: 1rem 2rem;
    border-radius: var(--radius-2xl);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s var(--transition-smooth);
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 10px 30px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(255, 107, 53, 0.4);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--glass-border);
}

.btn-outline:hover {
    background: var(--glass-bg);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ==================== FEATURES SECTION ==================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-lg);
    transition: all 0.4s var(--transition-smooth);
    position: relative;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-2xl);
    padding: 1px;
    background: var(--accent-gradient);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.4s var(--transition-smooth);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(255, 107, 53, 0.2);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ==================== GENERATOR SECTION ==================== */
.fitness-form {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    box-shadow: 0 20px 60px var(--glass-shadow);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

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

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.875rem 1.25rem;
    border-radius: var(--radius-2xl);
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s var(--transition-smooth);
    backdrop-filter: blur(10px);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: rgba(255, 107, 53, 0.5);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-tertiary);
}

.form-actions {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-lg);
}

/* ==================== RESULTS SECTION ==================== */
.results {
    background: linear-gradient(180deg, transparent 0%, rgba(255, 107, 53, 0.05) 100%);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.results-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.plan-content {
    display: grid;
    gap: var(--spacing-lg);
}

.plan-overview {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-lg);
}

.plan-week {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-lg);
}

.day-card {
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.day-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.exercise-list {
    list-style: none;
    padding: 0;
}

.exercise-item {
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-2xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.exercise-name {
    font-weight: 600;
    color: var(--text-primary);
}

.exercise-details {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ==================== HOW IT WORKS ==================== */
.steps-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr auto 1fr;
    gap: var(--spacing-md);
    align-items: center;
}

.step-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    text-align: center;
    position: relative;
    transition: all 0.4s var(--transition-smooth);
}

.step-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(82, 198, 157, 0.2);
}

.step-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: var(--secondary-gradient);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.25rem;
}

.step-icon {
    font-size: 3rem;
    margin: var(--spacing-md) 0;
}

.step-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.step-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

.step-connector {
    width: 50px;
    height: 2px;
    background: var(--glass-border);
    position: relative;
}

.step-connector::after {
    content: '→';
    position: absolute;
    right: -10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
}

/* ==================== ABOUT SECTION ==================== */
.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.about-text p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-text strong {
    color: var(--text-primary);
}

.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 1;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-icon {
    font-size: 8rem;
}

/* ==================== FOOTER ==================== */
.footer {
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--glass-border);
    padding: var(--spacing-2xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

.footer-heading {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s var(--transition-smooth);
}

.footer-links a:hover {
    color: var(--text-primary);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--glass-border);
    color: var(--text-tertiary);
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 968px) {
    .steps-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .step-connector {
        display: none;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(10, 10, 10, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-sm);
        transform: translateY(-200%);
        transition: transform 0.3s var(--transition-smooth);
        border-bottom: 1px solid var(--glass-border);
    }
    
    .nav-menu.active {
        transform: translateY(0);
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .results-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .results-actions {
        width: 100%;
        flex-direction: column;
    }
    
    .results-actions .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
}

/* ==================== UTILITY CLASSES ==================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s var(--transition-smooth);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

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

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }