/*
Theme Name: South Portfolio
Theme URI: https://south-create.com
Author: south
Description: 明るく爽やかなモダンデザインの個人開発者向けポートフォリオテーマ
Version: 2.1.0
Text Domain: south-portfolio
*/

/* ===== CSS Variables ===== */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --bg-accent: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-purple: #8b5cf6;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
}

a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Header ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: all 0.3s ease;
}

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

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

.site-logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

.logo-bracket {
    font-weight: 600;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 48px;
}

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
    transition: width 0.3s ease;
}

.nav-menu a:hover {
    color: var(--accent-blue);
}

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

/* Mobile Menu */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    position: relative;
    width: 32px;
    height: 24px;
}

.menu-toggle span {
    display: block;
    position: absolute;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    left: 0;
}

.menu-toggle span:nth-child(1) { top: 0; }
.menu-toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.menu-toggle span:nth-child(3) { bottom: 0; }

.menu-toggle.active span:nth-child(1) {
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
}
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) {
    bottom: 50%;
    transform: translateY(50%) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding-top: 80px;
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 50%, #f093fb15 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.1), transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.1), transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(16, 185, 129, 0.05), transparent 70%);
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    animation: fadeInUp 1s ease-out;
}

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 50px;
    color: var(--accent-blue);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 32px;
    animation: pulse 2s infinite;
}

.hero-title {
    font-size: 5rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.text-gradient {
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #06b6d4 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradientShift 5s ease infinite;
    background-size: 200% 200%;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 48px;
    font-weight: 400;
}

.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 16px 32px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

.btn-outline:hover {
    border-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.05);
    transform: translateY(-2px);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--accent-blue), transparent);
    animation: scrollPulse 2s infinite;
}

/* ===== Section Common ===== */
section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-label {
    display: inline-block;
    color: var(--accent-blue);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 16px;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

/* ===== About ===== */
.about {
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: 24px;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.stat-item {
    text-align: center;
    padding: 32px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* ===== Skills ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.skill-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px 32px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateY(30px);
    box-shadow: var(--shadow-sm);
}

.skill-card.aos-animate {
    opacity: 1;
    transform: translateY(0);
}

.skill-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-blue);
    box-shadow: var(--shadow-xl);
}

.skill-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-radius: 16px;
    margin-bottom: 24px;
    color: var(--accent-blue);
}

.skill-icon svg {
    width: 32px;
    height: 32px;
}

.skill-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.skill-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tags span {
    padding: 6px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.skill-tags span:hover {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

/* ===== Works ===== */
.works {
    background: var(--bg-secondary);
}

.works-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.work-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: scale(0.95);
    box-shadow: var(--shadow-sm);
}

.work-card.aos-animate {
    opacity: 1;
    transform: scale(1);
}

.work-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.work-image {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.work-web { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.work-ai { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.work-video { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.work-extension { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }

.work-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(4px);
    transition: all 0.3s ease;
}

.work-card:hover .work-overlay {
    background: rgba(0, 0, 0, 0.4);
}

.work-category {
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 50px;
    color: var(--accent-blue);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.work-info {
    padding: 32px;
}

.work-info h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.work-info p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* ===== Blog ===== */
.blog {
    background: var(--bg-primary);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.blog-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.blog-image {
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--bg-secondary);
}

.blog-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.blog-card:hover .blog-image img {
    transform: scale(1.05);
}

.blog-content {
    padding: 24px;
}

.blog-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.blog-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.blog-content p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.blog-link {
    color: var(--accent-blue);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* ===== Contact ===== */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.contact-link:hover {
    border-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.05);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.contact-link svg {
    width: 24px;
    height: 24px;
}

/* ===== Footer ===== */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 60px 0;
}

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

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 20px;
}

.copyright {
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

@keyframes scrollPulse {
    0%, 100% {
        opacity: 0;
        transform: translateY(0);
    }
    50% {
        opacity: 1;
        transform: translateY(20px);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.8;
    }
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero-title { font-size: 4rem; }
    .section-title { font-size: 2.5rem; }
    .about-content { gap: 60px; }
}

@media (max-width: 768px) {
    .menu-toggle { display: block; }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 32px 24px;
        gap: 0;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active { display: flex; }
    .nav-menu li { border-bottom: 1px solid var(--border); }
    .nav-menu li:last-child { border-bottom: none; }
    .nav-menu a { display: block; padding: 20px 0; font-size: 1.1rem; }
    .nav-menu a::after { display: none; }
    
    .hero-title { font-size: 2.5rem; }
    .hero-description { font-size: 1rem; }
    .hero-actions { flex-direction: column; align-items: stretch; }
    
    section { padding: 80px 0; }
    .section-header { margin-bottom: 60px; }
    .section-title { font-size: 2rem; }
    
    .about-content { grid-template-columns: 1fr; gap: 48px; }
    .about-stats { grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .stat-item { padding: 24px 12px; }
    .stat-number { font-size: 1.75rem; }
    
    .skills-grid { grid-template-columns: 1fr; }
    .works-grid { grid-template-columns: 1fr; }
    .blog-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .section-title { font-size: 1.75rem; }
    .about-stats { grid-template-columns: 1fr; }
}