/* Danone Category Manager Training Hub - World-Class Design */

:root {
    /* Danone Brand Colors - Refined */
    --primary-blue: #0052CC;
    --primary-blue-light: #4285F4;
    --primary-blue-dark: #002952;
    --accent-blue: #E3F2FD;
    --accent-green: #00C853;
    --accent-green-light: #69F0AE;
    
    /* Neutral Palette */
    --white: #FFFFFF;
    --gray-50: #FAFBFC;
    --gray-100: #F4F6F8;
    --gray-200: #E5E8EC;
    --gray-300: #C1C7D0;
    --gray-400: #97A0AF;
    --gray-500: #6B778C;
    --gray-600: #505F79;
    --gray-700: #42526E;
    --gray-800: #253858;
    --gray-900: #091E42;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(9, 30, 66, 0.08);
    --shadow-md: 0 4px 12px rgba(9, 30, 66, 0.12);
    --shadow-lg: 0 8px 24px rgba(9, 30, 66, 0.16);
    --shadow-xl: 0 16px 48px rgba(9, 30, 66, 0.20);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-700);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Typography System */
.text-display-xl {
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.text-display-lg {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.text-heading-xl {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 600;
    line-height: 1.3;
}

.text-heading-lg {
    font-size: clamp(1.25rem, 2.5vw, 1.875rem);
    font-weight: 600;
    line-height: 1.4;
}

.text-body-lg {
    font-size: 1.125rem;
    line-height: 1.7;
}

.text-body {
    font-size: 1rem;
    line-height: 1.6;
}

/* Layout System */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.section {
    padding: var(--space-4xl) 0;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--gray-200);
    transition: all var(--transition-base);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    color: var(--gray-900);
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.8;
}

.logo img {
    height: 28px;
    width: auto;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-2xl);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    list-style: none;
}

.nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    position: relative;
    transition: color var(--transition-fast);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width var(--transition-base);
}

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

.cta-button {
    background: var(--primary-blue);
    color: var(--white);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.cta-button:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--gray-600);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--space-xs);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    height: 100%;
    background: linear-gradient(135deg, var(--accent-blue) 0%, rgba(66, 133, 244, 0.1) 100%);
    clip-path: polygon(20% 0%, 100% 0%, 100% 100%, 0% 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    align-items: center;
    width: 100%;
}

.hero-text {
    max-width: 600px;
}

.hero-title {
    color: var(--gray-900);
    margin-bottom: var(--space-lg);
    font-family: var(--font-display);
}

.hero-subtitle {
    color: var(--gray-600);
    margin-bottom: var(--space-2xl);
    max-width: 500px;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.btn-primary {
    background: var(--primary-blue);
    color: var(--white);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--gray-700);
    padding: var(--space-md) var(--space-xl);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
}

.btn-secondary:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
    transform: translateY(-2px);
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-card {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-xl);
    max-width: 400px;
    position: relative;
    z-index: 3;
}

.hero-card-title {
    color: var(--gray-900);
    margin-bottom: var(--space-md);
    font-size: 1.25rem;
    font-weight: 600;
}

.hero-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-blue);
    display: block;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.progress-bar {
    background: var(--gray-100);
    border-radius: var(--radius-sm);
    height: 8px;
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.progress-fill {
    background: linear-gradient(90deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    height: 100%;
    border-radius: var(--radius-sm);
    transition: width 1s ease-out;
}

/* Content Sections */
.content-section {
    background: var(--white);
    border-bottom: 1px solid var(--gray-100);
}

.section-header {
    padding: var(--space-2xl) 0;
    cursor: pointer;
    transition: all var(--transition-base);
    border-bottom: 1px solid transparent;
}

.section-header:hover {
    border-bottom-color: var(--gray-200);
}

.section-header-content {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.section-icon {
    width: 60px;
    height: 60px;
    background: var(--accent-blue);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.section-title {
    flex: 1;
    color: var(--gray-900);
}

.section-toggle {
    width: 40px;
    height: 40px;
    background: var(--gray-100);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
    transition: all var(--transition-base);
}

.section-toggle:hover {
    background: var(--gray-200);
    color: var(--primary-blue);
}

.section-content {
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-slow);
}

.section-content.active {
    max-height: 5000px;
    padding-bottom: var(--space-3xl);
}

.section-content.active .section-toggle {
    transform: rotate(180deg);
    background: var(--primary-blue);
    color: var(--white);
}

/* Subsections */
.subsection {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    margin-bottom: var(--space-xl);
    border-left: 4px solid var(--primary-blue);
    transition: all var(--transition-base);
}

.subsection:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.subsection:last-child {
    margin-bottom: 0;
}

.subsection-title {
    color: var(--gray-900);
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.subsection-title i {
    color: var(--primary-blue);
}

.subsection-content {
    color: var(--gray-600);
}

.subsection-content p {
    margin-bottom: var(--space-md);
}

.subsection-content ul {
    margin-left: var(--space-lg);
    margin-top: var(--space-md);
}

.subsection-content li {
    margin-bottom: var(--space-sm);
    color: var(--gray-600);
}

.subsection-content li::marker {
    color: var(--primary-blue);
}

/* Category Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
}

.category-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue-light);
}

.category-title {
    color: var(--gray-900);
    margin-bottom: var(--space-xl);
    text-align: center;
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.category-card .subsection {
    background: rgba(66, 133, 244, 0.04);
    border-left-color: var(--primary-blue-light);
    margin-bottom: var(--space-lg);
    padding: var(--space-lg);
}

.category-card .subsection-title {
    font-size: 1rem;
    margin-bottom: var(--space-md);
}

.category-card .subsection-content {
    font-size: 0.9rem;
}

/* Highlight Boxes */
.highlight-box {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    color: var(--white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    margin: var(--space-lg) 0;
    position: relative;
    overflow: hidden;
}

.highlight-box::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transform: rotate(45deg);
}

.highlight-box.warning {
    background: linear-gradient(135deg, #FF6B35 0%, #F7931E 100%);
}

.highlight-box.info {
    background: linear-gradient(135deg, var(--accent-green) 0%, var(--accent-green-light) 100%);
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--space-3xl) 0;
    text-align: center;
}

.footer p {
    margin-bottom: var(--space-sm);
}

.footer p:last-child {
    margin-bottom: 0;
    color: var(--gray-400);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
        text-align: center;
    }
    
    .hero::before {
        display: none;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    .header-content {
        height: 70px;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: var(--space-lg);
        box-shadow: var(--shadow-lg);
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .btn-primary,
    .btn-secondary {
        padding: var(--space-sm) var(--space-lg);
        font-size: 0.9rem;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .section-header-content {
        gap: var(--space-md);
    }
    
    .section-icon {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    .hero {
        min-height: 80vh;
    }
    
    .hero-card {
        padding: var(--space-lg);
        margin: 0 var(--space-md);
    }
    
    .subsection {
        padding: var(--space-lg);
    }
    
    .category-card {
        padding: var(--space-lg);
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Print Styles */
@media print {
    .header,
    .footer {
        background: var(--white) !important;
        color: var(--gray-900) !important;
        box-shadow: none !important;
    }
    
    .section-content {
        max-height: none !important;
        padding-bottom: var(--space-lg) !important;
    }
    
    .content-section {
        break-inside: avoid;
        border: 1px solid var(--gray-300);
        margin-bottom: var(--space-lg);
    }
}