/* CSS Variables */
:root {
    --color-primary: #1a365d;
    --color-primary-light: #2c5282;
    --color-primary-dark: #0f2040;
    --color-accent: #c5a47e;
    --color-text: #2d3748;
    --color-text-light: #718096;
    --color-background: #ffffff;
    --color-background-alt: #f7fafc;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    --border-radius: 8px;
    --border-radius-full: 9999px;
    --shadow: 0 1px 3px 0 rgba(0,0,0,0.1), 0 1px 2px 0 rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; font-size: 16px; line-height: 1.6; color: var(--color-text); background-color: var(--color-background); }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-xl); }

/* Navigation */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background-color: var(--color-background); box-shadow: var(--shadow); }
.nav-container { display: flex; align-items: center; justify-content: space-between; max-width: 1200px; margin: 0 auto; padding: var(--spacing-md) var(--spacing-xl); }
.nav-logo { font-size: 1.5rem; font-weight: 700; color: var(--color-primary); }
.nav-menu { display: flex; align-items: center; gap: var(--spacing-xl); }
.nav-link { font-size: 0.9375rem; font-weight: 500; color: var(--color-text); transition: color var(--transition-fast); }
.nav-link:hover { color: var(--color-primary); }
.nav-toggle { display: none; padding: var(--spacing-xs); }
.hamburger { display: block; width: 24px; height: 2px; background-color: var(--color-text); position: relative; }
.hamburger::before, .hamburger::after { content: ''; position: absolute; width: 24px; height: 2px; background-color: var(--color-text); }
.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

/* Hero */
.hero { min-height: 100vh; display: flex; align-items: center; background: linear-gradient(135deg, var(--color-background) 0%, var(--color-background-alt) 100%); position: relative; overflow: hidden; }
.hero-content { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-4xl); align-items: center; max-width: 1200px; margin: 0 auto; padding: var(--spacing-4xl) var(--spacing-xl); }
.hero-subtitle { font-size: 0.875rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-accent); margin-bottom: var(--spacing-md); }
.hero-title { font-size: 3.5rem; font-weight: 700; color: var(--color-primary); line-height: 1.1; margin-bottom: var(--spacing-lg); }
.hero-description { font-size: 1.125rem; color: var(--color-text-light); margin-bottom: var(--spacing-xl); max-width: 540px; }
.hero-actions { display: flex; gap: var(--spacing-md); flex-wrap: wrap; }

/* Buttons */
.btn { display: inline-flex; padding: var(--spacing-md) var(--spacing-xl); font-size: 0.9375rem; font-weight: 600; border-radius: var(--border-radius-full); transition: all var(--transition-base); }
.btn-primary { background-color: var(--color-primary); color: white; }
.btn-primary:hover { background-color: var(--color-primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline { background-color: transparent; color: var(--color-primary); border: 2px solid var(--color-primary); }
.btn-outline:hover { background-color: var(--color-primary); color: white; transform: translateY(-2px); }

/* Hero Shapes */
.hero-visual { display: flex; justify-content: center; align-items: center; }
.hero-shapes { position: relative; width: 400px; height: 400px; }
.shape { position: absolute; border-radius: var(--border-radius); opacity: 0.1; }
.shape-1 { width: 100%; height: 100%; background-color: var(--color-primary); animation: float 6s ease-in-out infinite; }
.shape-2 { width: 80%; height: 80%; background-color: var(--color-accent); top: 10%; left: 10%; animation: float 8s ease-in-out infinite reverse; }
.shape-3 { width: 60%; height: 60%; background-color: var(--color-primary-light); top: 20%; left: 20%; animation: float 10s ease-in-out infinite; }

/* Sections */
section { padding: var(--spacing-4xl) 0; }
.section-header { text-align: center; margin-bottom: var(--spacing-3xl); }
.section-subtitle { display: inline-block; font-size: 0.875rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-accent); margin-bottom: var(--spacing-md); }
.section-title { font-size: 2.5rem; font-weight: 700; color: var(--color-primary); }

/* About */
.about-content { display: grid; grid-template-columns: 2fr 1fr; gap: var(--spacing-3xl); align-items: start; }
.about-bio { font-size: 1.125rem; line-height: 1.8; color: var(--color-text-light); text-align: justify; }
.about-stats { display: flex; flex-direction: column; gap: var(--spacing-lg); }
.stat-item { display: flex; align-items: center; gap: var(--spacing-md); padding: var(--spacing-lg); background-color: var(--color-background-alt); border-radius: var(--border-radius); }
.stat-number { font-size: 2rem; font-weight: 700; color: var(--color-primary); }
.stat-label { font-size: 0.9375rem; color: var(--color-text-light); }

/* Projects */
.projects { background-color: var(--color-background-alt); }
.projects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-xl); }
.project-card { background-color: var(--color-background); border-radius: var(--border-radius); overflow: hidden; box-shadow: var(--shadow); transition: all var(--transition-base); }
.project-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.project-image { height: 200px; background-color: var(--color-background-alt); display: flex; align-items: center; justify-content: center; }
.project-placeholder { font-size: 4rem; }
.project-content { padding: var(--spacing-xl); }
.project-title { font-size: 1.25rem; font-weight: 600; color: var(--color-primary); margin-bottom: var(--spacing-sm); }
.project-description { font-size: 0.9375rem; color: var(--color-text-light); margin-bottom: var(--spacing-md); line-height: 1.6; }
.project-tags { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); }
.tag { font-size: 0.75rem; font-weight: 500; padding: var(--spacing-xs) var(--spacing-sm); background-color: var(--color-background-alt); color: var(--color-text-light); border-radius: var(--border-radius-full); }

/* Skills */
.skills-content { display: grid; gap: var(--spacing-2xl); }
.skills-category { padding: var(--spacing-xl); background-color: var(--color-background-alt); border-radius: var(--border-radius); }
.category-title { font-size: 1.25rem; font-weight: 600; color: var(--color-primary); margin-bottom: var(--spacing-lg); }
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--spacing-md); }
.skill-item { display: flex; align-items: center; gap: var(--spacing-sm); padding: var(--spacing-md); background-color: var(--color-background); border-radius: 4px; font-size: 0.9375rem; color: var(--color-text); }
.skill-icon { font-size: 1.25rem; }

/* Contact */
.contact { background-color: var(--color-background-alt); }
.contact-content { max-width: 600px; margin: 0 auto; text-align: center; }
.contact-description { font-size: 1.125rem; color: var(--color-text-light); margin-bottom: var(--spacing-xl); }
.contact-links { display: flex; justify-content: center; gap: var(--spacing-xl); flex-wrap: wrap; }
.contact-link { display: flex; align-items: center; gap: var(--spacing-sm); padding: var(--spacing-md) var(--spacing-xl); background-color: var(--color-background); border-radius: var(--border-radius); color: var(--color-primary); font-weight: 500; transition: all var(--transition-base); }
.contact-link:hover { background-color: var(--color-primary); color: white; transform: translateY(-3px); box-shadow: var(--shadow-md); }

/* Footer */
.footer { background-color: var(--color-primary); padding: var(--spacing-2xl) 0; color: white; }
.footer-content { text-align: center; }
.footer-text { font-size: 0.875rem; color: rgba(255,255,255,0.7); margin-bottom: var(--spacing-sm); }
.footer-managed { font-size: 0.875rem; color: rgba(255,255,255,0.8); display: flex; align-items: center; justify-content: center; gap: var(--spacing-sm); }
.openclaw-badge { font-size: 1.125rem; }

/* Animations */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-20px); } }