/* Prime Time Endurance - Unified CSS Design System */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@400;500;600;700;800;900&display=swap');

:root {
    /* Color Palette */
    --bg-base: #0b0f19;
    --bg-surface: #131b2e;
    --bg-surface-elevated: #1e293b;
    --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;
    
    /* Brand Gradients */
    --color-prime-start: #f43f5e;
    --color-prime-end: #ec4899;
    --gradient-prime: linear-gradient(135deg, var(--color-prime-start), var(--color-prime-end));
    --glow-prime: 0 0 25px rgba(244, 63, 94, 0.4);
    
    --color-ruck-start: #0d9488;
    --color-ruck-end: #14b8a6;
    --gradient-ruck: linear-gradient(135deg, var(--color-ruck-start), var(--color-ruck-end));
    --glow-ruck: 0 0 25px rgba(13, 148, 136, 0.4);
    
    --gradient-accent: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --glow-accent: 0 0 25px rgba(59, 130, 246, 0.4);
    
    /* Layout & Spacing */
    --container-max-width: 1200px;
    --header-height: 80px;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    
    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    -webkit-font-smoothing: antialiased;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography elements */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.25;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
}

h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    margin-bottom: 24px;
    text-align: center;
}

h3 {
    font-size: clamp(1.3rem, 2.5vw, 1.75rem);
}

p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 16px;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

/* Header & Navigation */
header.site-header {
    background: rgba(11, 15, 25, 0.8);
    backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: var(--transition-normal);
}

header.site-header.scrolled {
    background: rgba(11, 15, 25, 0.95);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    height: 70px;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-prime-start), var(--color-ruck-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 8px 0;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--gradient-prime);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-normal);
}

.nav-link:hover::after, .nav-link.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 1001;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
}

.btn-prime {
    background: var(--gradient-prime);
    color: white;
}

.btn-prime:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-prime);
}

.btn-ruck {
    background: var(--gradient-ruck);
    color: white;
}

.btn-ruck:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-ruck);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.btn-link {
    background: transparent;
    color: var(--text-secondary);
    padding: 8px 16px;
    font-size: 0.95rem;
}

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

/* Hero Section */
.hero-section {
    padding-top: calc(var(--header-height) + 60px);
    padding-bottom: 80px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(244, 63, 94, 0.1) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

.hero-section::after {
    content: '';
    position: absolute;
    bottom: -10%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(20, 184, 166, 0.08) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
}

.hero-text h1 span {
    background: linear-gradient(135deg, var(--color-prime-start), #f472b6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text p.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 640px;
}

.hero-cover {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    justify-content: center;
}

.hero-cover img {
    max-width: 280px;
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
    transition: transform var(--transition-slow);
}

.hero-cover img:hover {
    transform: scale(1.03) rotate(1deg);
}

/* Book Details Page Showcase */
.book-showcase-section {
    padding: 80px 0;
    border-top: 1px solid var(--border-color);
}

.book-card-featured {
    background: linear-gradient(135deg, rgba(19, 27, 46, 0.5), rgba(30, 41, 59, 0.5));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px;
    backdrop-filter: blur(10px);
}

.book-card-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 48px;
    align-items: center;
}

/* Cards & Grid Layouts */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    margin-top: 48px;
}

.glass-card {
    background: rgba(19, 27, 46, 0.6);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px;
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    transform: translateY(-6px);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.glass-card i.card-icon {
    font-size: 2.25rem;
    margin-bottom: 24px;
    display: inline-block;
    background: var(--gradient-prime);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.glass-card.ruck-card i.card-icon {
    background: var(--gradient-ruck);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.glass-card h3 {
    margin-bottom: 16px;
    font-size: 1.4rem;
}

.glass-card p {
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 0;
}

/* Calculators Hub Section */
.calculators-section {
    padding: 80px 0;
    border-top: 1px solid var(--border-color);
}

.calc-preview-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.calc-preview-card.prime-calc:hover {
    box-shadow: var(--glow-prime);
    border-color: var(--color-prime-start);
}

.calc-preview-card.ruck-calc:hover {
    box-shadow: var(--glow-ruck);
    border-color: var(--color-ruck-start);
}

.calc-preview-card .card-footer {
    margin-top: auto;
    padding-top: 24px;
}

/* Newsletter Subscription Section */
.newsletter-section {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-base) 0%, #0d1527 100%);
    border-top: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.newsletter-container {
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
    z-index: 1;
    position: relative;
}

.newsletter-container h2 {
    margin-bottom: 16px;
}

.newsletter-container p {
    font-size: 1.15rem;
    margin-bottom: 36px;
}

/* Embed Kit Form Style Override */
.newsletter-container iframe {
    width: 100% !important;
    border: none;
    overflow: hidden;
}

/* Forms & Calculators Page Styling */
.calculator-page-section {
    padding-top: calc(var(--header-height) + 40px);
    padding-bottom: 80px;
}

.calc-container {
    max-width: 800px;
    margin: 0 auto;
}

.calculator-wrapper {
    background: rgba(19, 27, 46, 0.75);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    backdrop-filter: blur(16px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
    margin-top: 32px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.input-control {
    width: 100%;
    padding: 14px 18px;
    background-color: rgba(11, 15, 25, 0.6);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.input-control:focus {
    outline: none;
    border-color: var(--color-prime-start);
    background-color: rgba(11, 15, 25, 0.85);
    box-shadow: 0 0 10px rgba(244, 63, 94, 0.15);
}

.calc-wrapper-ruck .input-control:focus {
    border-color: var(--color-ruck-start);
    box-shadow: 0 0 10px rgba(13, 148, 136, 0.15);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

/* Calculator Results Panel */
.result-panel {
    margin-top: 36px;
    padding: 24px;
    border-radius: var(--radius-md);
    background: rgba(11, 15, 25, 0.5);
    border: 1px solid var(--border-color);
    display: none;
    animation: fadeIn var(--transition-normal) forwards;
}

.result-panel.show {
    display: block;
}

.result-panel.success {
    border-left: 4px solid var(--color-prime-start);
}

.calc-wrapper-ruck .result-panel.success {
    border-left: 4px solid var(--color-ruck-start);
}

.result-title {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.result-value {
    font-family: var(--font-heading);
    font-size: 2.25rem;
    font-weight: 900;
    line-height: 1.1;
}

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

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

.result-explanation {
    margin-top: 12px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.result-panel.error {
    border-left: 4px solid #ef4444;
    background: rgba(239, 68, 68, 0.05);
}

.result-panel.error .result-title {
    color: #f87171;
}

.result-panel.error .result-value {
    color: #ef4444;
    font-size: 1.25rem;
    font-weight: 500;
    -webkit-text-fill-color: initial;
    background: none;
}

/* Incline Dashboard Results Grid */
.results-dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.dashboard-stat-box {
    background: rgba(11, 15, 25, 0.4);
    border: 1px solid var(--border-color);
    padding: 16px;
    border-radius: var(--radius-sm);
    text-align: center;
}

.dashboard-stat-box.featured-stat {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.1), rgba(11, 15, 25, 0.4));
    border-color: rgba(13, 148, 136, 0.3);
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.featured-stat .stat-label {
    color: var(--text-secondary);
}

.stat-value {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-primary);
}

.featured-stat .stat-value {
    font-size: 2rem;
    color: var(--color-ruck-end);
    text-shadow: 0 0 10px rgba(20, 184, 166, 0.2);
}

/* Footer Section */
footer.site-footer {
    background-color: #060911;
    border-top: 1px solid var(--border-color);
    padding: 48px 0 32px 0;
    color: var(--text-secondary);
    margin-top: auto;
}

.footer-grid {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
    margin-bottom: 32px;
}

.footer-logo {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.footer-nav {
    display: flex;
    gap: 24px;
    list-style: none;
}

.footer-link {
    font-size: 0.9rem;
}

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

.footer-divider {
    border: none;
    border-top: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.footer-copyright {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
    flex-wrap: wrap;
    gap: 12px;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive Styles */
@media (max-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 36px;
    }
    
    .hero-text p.subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .book-card-grid {
        grid-template-columns: 1fr;
        gap: 32px;
        text-align: center;
    }

    .book-card-featured {
        padding: 32px;
    }

    .hero-cover img {
        max-width: 240px;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--bg-base);
        flex-direction: column;
        padding: 48px 24px;
        gap: 24px;
        transform: translateX(100%);
        transition: transform var(--transition-normal);
        border-top: 1px solid var(--border-color);
    }

    .nav-menu.open {
        transform: translateX(0);
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .footer-grid {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-nav {
        flex-direction: column;
        gap: 16px;
    }
    
    .footer-copyright {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }
}