:root {
    /* Enhanced Spacing Scale */
    --space-xxs: 0.125rem;
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-xxl: 3rem;
    --space-xxxl: 4rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-xxl: 2rem;
    --font-size-hero: 2.5rem;

    /* Borders */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --border-radius-round: 50%;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.16);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    background-color: var(--background-color);
}

:root {
    transition: background-color 0.3s ease, color 0.3s ease;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    min-height: 100vh;
    background-color: var(--background-color);
    color: var(--text-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Layout Components */
.header-controls {
    position: fixed;
    top: var(--space-md);
    right: var(--space-md);
    display: flex;
    gap: var(--space-md);
    align-items: center;
    z-index: 1000;
}

/* Language Switcher */
.language-switcher {
    display: flex;
    background: var(--card-bg);
    border-radius: 20px;
    padding: 4px;
    backdrop-filter: blur(10px);
    height: 32px;
    border: 1px solid var(--shadow-color);
    box-shadow: var(--shadow-sm);
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    padding: 4px 12px;
    border-radius: 16px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.8em;
    transition: all var(--transition-fast);
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lang-btn.active {
    background: var(--primary-color);
    color: var(--on-primary-color);
}

/* Theme Toggle Switch */
.theme-toggle {
    position: relative;
    width: 60px;
    height: 32px;
    background: var(--card-bg);
    border: 1px solid var(--shadow-color);
    border-radius: 30px;
    cursor: pointer;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

/* Sun icon (left side) */
.theme-toggle::before {
    content: '☀️';
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    transition: all var(--transition-normal);
    z-index: 1;
}

/* Moon icon (right side) */
.theme-toggle::after {
    content: '🌙';
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    transition: all var(--transition-normal);
    z-index: 1;
}

/* Moving circle */
.theme-toggle .toggle-handle {
    position: absolute;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    top: 4px;
    left: 4px;
    background: var(--primary-color);
    transition: all var(--transition-normal);
    z-index: 2;
}

[data-theme="dark"] .theme-toggle .toggle-handle {
    transform: translateX(28px);
    background: var(--primary-color);
}

/* Hero Section */
.hero-section {
    min-height: 70vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-xxl) var(--space-lg);
    position: relative;
    background-color: var(--background-color);
}

.profile-container {
    margin-bottom: var(--space-xl);
}

.profile-frame {
    width: 280px;
    height: 280px;
    border-radius: var(--border-radius-round);
    padding: 8px;
    position: relative;
    margin: 0 auto;
    box-shadow: var(--shadow-xl);
    border: 4px solid var(--primary-color);
    animation: none;
    background: var(--card-bg);
}

.profile-image {
    width: 100%;
    height: 100%;
    border-radius: var(--border-radius-round);
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.page-developer .profile-image,
.page-home .profile-image {
    object-position: 50% 25%;
}

.profile-frame:hover .profile-image {
    transform: scale(1.05);
}

/* Content sections */
.content-section {
    padding: var(--space-xl) var(--space-lg);
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--background-color);
}

.material-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--space-xl);
    margin: var(--space-lg) auto;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 1px solid var(--shadow-color);
    color: var(--text-primary);
}

.material-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.material-card h2 {
    margin-bottom: var(--space-md);
    font-size: var(--font-size-xl);
    color: var(--primary-color);
    line-height: 1.3;
}

.material-card h3 {
    margin-bottom: var(--space-md);
    font-size: var(--font-size-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    line-height: 1.4;
    color: var(--text-primary);
}

.material-card h4 {
    margin: var(--space-lg) 0 var(--space-md) 0;
    font-size: var(--font-size-base);
    color: var(--text-secondary);
}

.material-card p {
    margin-bottom: var(--space-md);
    line-height: 1.7;
    color: var(--text-secondary);
}

.material-card ul,
.material-card ol {
    margin: var(--space-md) 0 var(--space-lg) 0;
    padding-left: var(--space-lg);
}

.material-card li {
    margin-bottom: var(--space-sm);
    line-height: 1.6;
    padding-left: var(--space-xs);
    color: var(--text-secondary);
}

.material-card li strong {
    color: var(--primary-color);
}

/* Skills list */
.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin: var(--space-md) 0;
}

.skill-chip {
    background: var(--primary-color);
    color: var(--on-primary-color);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--border-radius-xl);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.skill-chip:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* Highlighted text styles */
.developer-text {
    color: #1a365d;
    font-weight: 700;
}

.scout-text {
    color: #EA4335;
    font-weight: 700;
}

.builder-text {
    color: #d69e2e;
    font-weight: 700;
}

/* For dark mode support */
[data-theme="dark"] .developer-text { color: #90cdf4; }
[data-theme="dark"] .scout-text { color: #f28b82; }
[data-theme="dark"] .builder-text { color: #faf089; }

/* Page-specific animation containers */
.binary-rain,
.phoenix-fire,
.construction-dust {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    border-radius: 50%;
    overflow: hidden;
    z-index: 2;
}

/* Footer */
.main-footer {
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
    background: var(--surface-color);
    margin-top: var(--space-xxl);
    color: var(--text-primary);
}

.nav-footer {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin: 0 0 var(--space-lg) 0;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
    background: transparent;
}

.footer-link:hover,
.footer-link.active {
    background: var(--primary-color);
    color: var(--on-primary-color);
}

/* Story Section */
.story-section {
    line-height: 1.6;
}

.story-section ul {
    margin: var(--space-md) 0;
    padding-left: var(--space-lg);
}

.story-section li {
    margin-bottom: var(--space-sm);
}

blockquote {
    background: var(--surface-color);
    padding: var(--space-lg);
    border-radius: var(--border-radius-md);
    margin: var(--space-lg) 0;
    border-left: 4px solid var(--primary-color);
    font-style: italic;
    line-height: 1.6;
    color: var(--text-primary);
}

.hero-content h1 {
    font-size: var(--font-size-hero);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-text {
    font-size: var(--font-size-lg);
    line-height: 1.6;
    margin: var(--space-md) 0;
    color: var(--text-primary);
    max-width: 600px;
}

.highlight {
    font-weight: 600;
}

/* Buttons */
.button-group {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    margin: var(--space-xl) 0;
    flex-wrap: wrap;
}

.btn {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    font-family: var(--font-family);
    cursor: pointer;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

/* Persona Navigation */
.persona-nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    max-width: 1000px;
    margin: var(--space-xxl) auto;
    padding: 0 var(--space-xl);
    background-color: var(--background-color);
}

.nav-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-xl);
    border-radius: var(--border-radius-xl);
    text-decoration: none;
    transition: all var(--transition-normal);
    background: var(--card-bg);
    box-shadow: var(--shadow-md);
    text-align: center;
    color: var(--text-primary);
    border: 1px solid var(--shadow-color);
}

.nav-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.nav-icon {
    font-size: 3rem;
    margin-bottom: var(--space-sm);
}

.nav-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.nav-card p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* About Section */
.about-section {
    padding: var(--space-xxl) var(--space-xl);
    background: var(--surface-color);
}

.about-card {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    padding: var(--space-xl);
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    color: var(--text-primary);
}

/* Footer */
.main-footer {
    text-align: center;
    padding: var(--space-xl);
    background: var(--surface-color);
    margin-top: var(--space-xxl);
    color: var(--text-primary);
}

.social-links {
    display: flex;
    gap: var(--space-lg);
    justify-content: center;
    margin-bottom: var(--space-lg);
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--border-radius-md);
}

.social-link:hover {
    color: var(--primary-color);
    background: var(--card-bg);
}

.copyright {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Smooth scroll behavior */
html {
    scroll-behavior: smooth;
}

body.loading * {
    transition: none !important;
}

/* List styling */
.material-card ul {
    list-style: none;
    padding-left: 0;
}

.material-card ul li {
    position: relative;
    padding-left: var(--space-lg);
}

.material-card ul li::before {
    content: '•';
    color: var(--primary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

.btn {
    margin-top: var(--space-sm);
}

/* Blockquote styling */
blockquote {
    position: relative;
}

/* Animations */
.slide-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.slide-in-from-top {
    opacity: 0;
    transform: translateY(-50px);
    animation: slideFromTop 0.8s ease forwards;
}

.slide-in-from-bottom {
    opacity: 0;
    transform: translateY(50px);
    animation: slideFromBottom 0.8s ease forwards 0.3s;
}

.slide-in-from-left {
    opacity: 0;
    transform: translateX(-50px);
    animation: slideFromLeft 0.8s ease forwards;
}

.slide-in-from-right {
    opacity: 0;
    transform: translateX(50px);
    animation: slideFromRight 0.8s ease forwards 0.3s;
}

@keyframes slideFromTop {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideFromBottom {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideFromLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideFromRight {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive improvements */
@media (max-width: 768px) {
    .hero-section {
        min-height: 60vh;
        padding: var(--space-xl) var(--space-md);
    }

    .content-section {
        padding: var(--space-lg) var(--space-md);
    }

    .material-card {
        padding: var(--space-lg);
        margin: var(--space-md) auto;
    }

    .material-card h2 {
        font-size: var(--font-size-lg);
    }

    .material-card h3 {
        font-size: var(--font-size-base);
    }

    .profile-frame {
        width: 240px;
        height: 240px;
    }

    .nav-footer {
        gap: var(--space-md);
    }

    .hero-content h1 {
        font-size: var(--font-size-xxl);
    }

    .button-group {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 220px;
        justify-content: center;
    }

    .persona-nav {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .header-controls {
        top: var(--space-sm);
        right: var(--space-sm);
    }
}

@media (max-width: 480px) {
    .hero-section {
        min-height: 50vh;
        padding: var(--space-lg) var(--space-sm);
    }

    .content-section {
        padding: var(--space-md) var(--space-sm);
    }

    .material-card {
        padding: var(--space-md);
        margin: var(--space-sm) auto;
    }

    .profile-frame {
        width: 200px;
        height: 200px;
    }

    .nav-footer {
        gap: var(--space-sm);
    }

    .footer-link {
        padding: var(--space-xs) var(--space-sm);
        font-size: var(--font-size-sm);
    }

    .skills-list {
        gap: var(--space-xs);
    }

    .skill-chip {
        padding: var(--space-xxs) var(--space-sm);
        font-size: 0.8rem;
    }

    .hero-content h1 {
        font-size: var(--font-size-xl);
    }

    .nav-card {
        padding: var(--space-lg);
    }

    .social-links {
        flex-direction: column;
        gap: var(--space-md);
    }

    .header-controls {
        gap: var(--space-sm);
    }

    .language-switcher {
        height: 28px;
    }

    .lang-btn {
        padding: 2px 10px;
        font-size: 0.75em;
    }

    .theme-toggle {
        width: 55px;
        height: 28px;
    }

    .theme-toggle .toggle-handle {
        width: 22px;
        height: 22px;
        top: 2px;
        left: 2px;
    }

    [data-theme="dark"] .theme-toggle .toggle-handle {
        transform: translateX(27px);
    }
}