/* 
   ==========================================================================
   Base Variables & Resets
   ========================================================================== */
:root {
    /* Color Palette */
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #0ea5e9;
    --dark: #0f172a;
    --light: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-400: #94a3b8;
    --gray-600: #475569;
    --gray-800: #1e293b;
    --white: #ffffff;
    
    /* Typography */
    --font-sans: 'Inter', 'Noto Sans JP', sans-serif;
    
    /* Transitios & Shadows */
    --transition: all 0.3s ease-in-out;
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* 
   ==========================================================================
   Typography & Utilities
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 800;
    line-height: 1.2;
    color: var(--dark);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-padding {
    padding: 6rem 0;
}

.bg-light {
    background-color: var(--gray-100);
}

.bg-dark {
    background-color: var(--dark);
}

.text-white, .text-white h2, .text-white p {
    color: var(--white);
}

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

.section-title {
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    position: relative;
    display: inline-block;
}

.underline {
    height: 4px;
    width: 60px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
}

.underline-center {
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    text-align: center;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--dark);
    border: 2px solid var(--dark);
}

.btn-secondary:hover {
    background: var(--dark);
    color: var(--white);
}

/* 
   ==========================================================================
   Navbar
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 5%;
    box-shadow: var(--shadow-sm);
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--dark);
    letter-spacing: -1px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 600;
    font-size: 1rem;
    color: var(--gray-800);
    position: relative;
    transition: var(--transition);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0%;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--primary);
}

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

.hamburger {
    display: none;
    cursor: pointer;
}

.hamburger .bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    transition: all 0.3s ease;
    background-color: var(--dark);
}

/* 
   ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: var(--white);
    overflow: hidden;
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4rem;
    position: relative;
    z-index: 10;
}

.hero-content {
    flex: 1;
    text-align: left;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: 5rem;
    line-height: 1.1;
    margin-bottom: 1rem;
    letter-spacing: -2px;
}

.hero-title span {
    font-size: 2.5rem;
    font-weight: 300;
    color: var(--gray-600);
    display: block;
    margin-top: 0.5rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 2.5rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.hero-socials .social-icon {
    transition: var(--transition);
}

.hero-socials .social-icon:hover {
    color: var(--primary) !important;
    transform: translateY(-3px);
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: flex-start;
}

.hero-image-wrapper {
    flex: 1;
    position: relative;
    animation: fadeInUp 1.2s ease-out;
    display: flex;
    justify-content: flex-end;
}

.hero-image {
    width: 100%;
    max-width: 550px;
    height: auto;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    object-fit: cover;
    transform: rotate(2deg);
    transition: var(--transition);
}

.hero-image:hover {
    transform: rotate(0deg) scale(1.02);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
    font-size: 1.5rem;
    color: var(--gray-400);
}

/* Abstract Shapes */
.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    z-index: 1;
    opacity: 0.5;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: var(--primary);
    top: -100px;
    right: -100px;
    animation: float 8s ease-in-out infinite alternate;
}

.shape-2 {
    width: 300px;
    height: 300px;
    background: var(--secondary);
    bottom: 50px;
    left: -50px;
    animation: float 6s ease-in-out infinite alternate-reverse;
}

/* 
   ==========================================================================
   About Section
   ========================================================================== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--gray-600);
    font-size: 1.1rem;
}

.personal-info {
    margin-top: 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
}

.info-item i {
    color: var(--primary);
    font-size: 1.2rem;
}

.about-image {
    position: relative;
}

.image-placeholder {
    width: 100%;
    height: 500px;
    background: var(--gray-100);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--gray-400);
    border: 2px dashed var(--gray-400);
}

.image-placeholder i {
    font-size: 5rem;
    margin-bottom: 1rem;
}

.experience-badge {
    position: absolute;
    bottom: -30px;
    left: -30px;
    background: var(--white);
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 15px;
    animation: float 5s ease-in-out infinite alternate;
}

.experience-badge .years {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
}

.experience-badge .label {
    font-weight: 600;
    line-height: 1.2;
    color: var(--gray-600);
}

/* 
   ==========================================================================
   Skills Section
   ========================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-card {
    background: var(--white);
    padding: 2.5rem 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    text-align: center;
}

.skill-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.skill-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--gray-100);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    color: var(--primary);
    transition: var(--transition);
}

.skill-card:hover .skill-icon {
    background: var(--primary);
    color: var(--white);
}

.skill-card h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.skill-card p {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* 
   ==========================================================================
   Projects Section
   ========================================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.project-card {
    background: var(--white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.project-img {
    height: 220px;
    position: relative;
    overflow: hidden;
}

.img-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-weight: 600;
    font-size: 1.2rem;
}

.bg-gradient-1 { background: linear-gradient(135deg, #10b981, #3b82f6); }
.bg-gradient-2 { background: linear-gradient(135deg, #f43f5e, #8b5cf6); }
.bg-gradient-3 { background: linear-gradient(135deg, #f59e0b, #ec4899); }

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.view-project {
    width: 50px;
    height: 50px;
    background: var(--white);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--primary);
    font-size: 1.2rem;
    transform: scale(0.5);
    transition: var(--transition);
}

.project-card:hover .view-project {
    transform: scale(1);
}

.view-project:hover {
    background: var(--primary);
    color: var(--white);
}

.project-info {
    padding: 2rem;
}

.project-info h3 {
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.project-info p {
    color: var(--gray-600);
    margin-bottom: 1.5rem;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tags span {
    padding: 0.3rem 0.8rem;
    background: var(--gray-100);
    color: var(--gray-600);
    font-size: 0.8rem;
    border-radius: 50px;
    font-weight: 600;
}

/* 
   ==========================================================================
   Note Articles Section
   ========================================================================== */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.article-card {
    background: var(--white);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 0, 0, 0.06);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: rgba(0, 0, 0, 0.12);
}

.article-date {
    font-size: 0.9rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

.article-title {
    font-size: 1.25rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.article-link {
    color: var(--gray-600);
    font-size: 0.95rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

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

/* 
   ==========================================================================
   Contact Section
   ========================================================================== */
.contact-subtitle {
    max-width: 600px;
    margin: 1.5rem auto 0;
    color: var(--gray-400);
}

.contact-content {
    max-width: 700px;
    margin: 0 auto;
}

.contact-form {
    background: var(--gray-800);
    padding: 3rem;
    border-radius: 20px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    color: var(--white);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-400);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.15);
}

.submit-btn {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    border-radius: 10px;
    padding: 1.2rem;
}

/* 
   ==========================================================================
   Footer
   ========================================================================== */
footer {
    background: #0b1120;
    color: var(--gray-400);
    padding: 3rem 0;
    text-align: center;
}

.social-links {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--white);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) translateX(-50%);
    }
    40% {
        transform: translateY(-20px) translateX(-50%);
    }
    60% {
        transform: translateY(-10px) translateX(-50%);
    }
}

@keyframes float {
    0% {
        transform: translateY(0px) rotate(0deg);
    }
    100% {
        transform: translateY(-20px) rotate(5deg);
    }
}

/* Reveal Animation Class */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* 
   ==========================================================================
   Media Queries (Responsive)
   ========================================================================== */
@media screen and (max-width: 968px) {
    .hero-container {
        flex-direction: column-reverse;
        text-align: center;
        margin-top: 6rem;
    }
    
    .hero-content {
        text-align: center;
    }
    
    .hero-socials {
        justify-content: center !important;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-image-wrapper {
        justify-content: center;
    }
    
    .hero-image {
        max-width: 80%;
    }

    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        margin-top: 3rem;
    }
    
    .hero-title {
        font-size: 4rem;
    }
}

@media screen and (max-width: 768px) {
    .nav-links {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-links.active {
        left: 0;
    }

    .nav-links a {
        display: block;
        padding: 1rem 0;
    }

    .hamburger {
        display: block;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero-title {
        font-size: 3rem;
    }

    .hero-title span {
        font-size: 1.8rem;
    }

    .personal-info {
        grid-template-columns: 1fr;
    }
    
    .contact-form {
        padding: 2rem;
    }
}