/* Base Variables */
:root {
    --navy: #1a2a4a;
    --navy-light: #2c3e63;
    --navy-dark: #0f1a2e;
    --lime: #FFB84D;
    --lime-dark: #F59E0B;
    --cyan: #4169E1;
    --cyan-dark: #2E4EC9;
    --purple: #2d3561;
    --white: #ffffff;
    --gray-50: #fafbfc;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --text-dark: #212529;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.8;
    color: var(--text-dark);
    background-color: var(--white);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', 'Noto Sans JP', sans-serif;
    line-height: 1.3;
    color: var(--navy);
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.5rem;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.25rem;
    }

    h2 {
        font-size: 2rem;
    }

    h3 {
        font-size: 1.5rem;
    }
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow);
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
    padding: 0 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 3rem;
    margin-left: auto;
}

.nav-menu .cta-button {
    margin-left: 2rem;
    padding: 0.8rem 1.5rem;
    background-color: var(--lime);
    color: var(--navy);
    border-radius: 25px;
    font-weight: 600;
    transition: var(--transition);
}

.nav-menu .cta-button:hover {
    background-color: var(--lime-dark);
    transform: translateY(-2px);
}

.logo h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--navy);
    letter-spacing: -0.03em;
    font-family: 'Poppins', sans-serif;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    font-weight: 500;
    color: var(--navy);
    position: relative;
}

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

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

.menu-toggle {
    display: none;
}

/* Hero Section */
.hero {
    height: 100vh;
    background-image: url('../images/header.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 20px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 42, 74, 0.3) 0%, rgba(44, 62, 99, 0.3) 100%);
}

.hero-content {
    max-width: 800px;
    color: var(--white);
    position: relative;
    z-index: 1;
}

.main-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    color: var(--white);
    font-weight: 700;
    line-height: 1.2;
}

.subtitle {
    font-size: 1.5rem;
    margin-bottom: 2.5rem;
    color: var(--white);
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    letter-spacing: 0.02em;
}

/* Buttons & CTAs */
.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    text-align: center;
}

.cta-button.primary {
    background-color: var(--lime);
    color: var(--navy);
}

.cta-button.primary:hover {
    background-color: var(--lime-dark);
    transform: translateY(-2px);
}

.cta-button.secondary {
    background-color: transparent;
    border: 2px solid var(--lime);
    color: var(--lime);
}

.cta-button.secondary:hover {
    background-color: var(--lime);
    color: var(--navy);
}

/* Sections */
.section {
    padding: 100px 0;
}

.section-dark {
    background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 100%);
    color: var(--white);
}

.section-dark .section-title {
    color: var(--white);
}

.section-dark .section-title::after {
    background-color: var(--cyan);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--lime);
    margin: 1rem auto 0;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

.about-content {
    font-size: 1.1rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.strength-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.strength-card {
    background: linear-gradient(135deg, #ffffff 0%, var(--gray-50) 100%);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    border: 2px solid var(--gray-200);
}

.strength-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--lime);
}

.strength-card i {
    font-size: 3rem;
    color: var(--lime);
    margin-bottom: 1.5rem;
    display: inline-block;
    transition: var(--transition);
}

.strength-card:hover i {
    transform: scale(1.1);
    color: var(--cyan);
}

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

/* Services Section */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

@media (min-width: 1200px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .services-grid {
        grid-template-columns: 1fr;
        padding: 1rem;
        gap: 2rem;
    }
}

.service-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    padding: 3rem 2.5rem;
    text-align: center;
    border: 2px solid var(--gray-200);
    min-height: 420px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    position: relative;
    gap: 1.5rem;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--cyan);
    background: #ffffff;
}

.service-image {
    width: 200px;
    height: 160px;
    object-fit: contain;
    margin: 0 auto;
    padding: 1.5rem;
    background: linear-gradient(135deg, #ffffff 0%, var(--gray-50) 100%);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 2px solid var(--gray-200);
}

.service-card:hover .service-image {
    transform: scale(1.08) translateY(-6px);
    box-shadow: 0 12px 24px rgba(0, 212, 255, 0.15);
    border-color: var(--cyan);
    background: linear-gradient(135deg, rgba(197, 255, 0, 0.05) 0%, rgba(0, 212, 255, 0.05) 100%);
}

.service-card h3 {
    font-size: 1.6rem;
    color: var(--navy);
    margin: 0;
    font-weight: 700;
}

.service-card p {
    font-size: 1rem;
    color: var(--gray-700);
    margin: 0;
    line-height: 1.7;
    flex-grow: 1;
}

.github-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--navy) 0%, var(--purple) 100%);
    color: var(--white);
    border-radius: 25px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    margin-top: auto;
}

.github-link:hover {
    background: linear-gradient(135deg, var(--purple) 0%, var(--navy) 100%);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(26, 42, 74, 0.3);
}

.github-link i {
    font-size: 1.1rem;
}

/* Achievements Section */
.achievements-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.achievement-card {
    background: linear-gradient(135deg, #ffffff 0%, var(--gray-50) 100%);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow);
    border: 2px solid var(--gray-200);
    transition: var(--transition);
}

.achievement-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--lime);
}

.achievement-card h3 {
    margin-bottom: 1.5rem;
    color: var(--navy);
    font-size: 1.5rem;
}

.achievement-card ul {
    list-style: none;
}

.achievement-card li {
    margin-bottom: 1.2rem;
    padding-left: 1.5rem;
    position: relative;
}

.achievement-card li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--lime);
    font-weight: bold;
}

.achievement-card a {
    color: var(--navy);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    border-bottom: 2px solid transparent;
}

.achievement-card a:hover {
    color: var(--cyan);
    border-bottom-color: var(--cyan);
}

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

.contact-content p {
    margin-bottom: 2rem;
}

/* Footer */
.footer {
    background-color: var(--navy);
    color: var(--white);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
}

.footer-info h3 {
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-links {
    font-size: 1.5rem;
}

.footer-links a {
    color: var(--white);
    margin-left: 1rem;
}

.footer-links a:hover {
    color: var(--lime);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Profile Section */
.profile-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.profile-text h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--white);
}

.profile-role {
    font-size: 1.1rem;
    color: var(--cyan);
    margin-bottom: 2rem;
    font-weight: 500;
}

.profile-text p {
    font-size: 1.1rem;
    line-height: 1.9;
    margin-bottom: 2rem;
    color: var(--gray-200);
}

.profile-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.profile-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    background-color: var(--lime);
    color: var(--navy);
    border-radius: 25px;
    font-weight: 600;
    transition: var(--transition);
}

.profile-link:hover {
    background-color: var(--lime-dark);
    transform: translateY(-2px);
}

/* Tech Stack Section */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.tech-category {
    background: rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: 16px;
    border: 2px solid rgba(197, 255, 0, 0.2);
    transition: var(--transition);
}

.tech-category:hover {
    border-color: var(--lime);
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-4px);
}

.tech-category h3 {
    color: var(--lime);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tech-category h3 i {
    font-size: 1.5rem;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tech-tag {
    background: rgba(197, 255, 0, 0.15);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid rgba(197, 255, 0, 0.3);
    transition: var(--transition-fast);
}

.tech-tag:hover {
    background: var(--lime);
    color: var(--navy);
    border-color: var(--lime);
}

/* Vision Section */
.section-vision {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
}

.vision-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.vision-statement {
    font-size: 2rem;
    color: var(--navy);
    margin-bottom: 2rem;
    font-weight: 700;
    font-family: 'Poppins', sans-serif;
    letter-spacing: -0.02em;
}

.vision-content p {
    font-size: 1.1rem;
    line-height: 1.9;
    color: var(--gray-700);
}

/* Award Badge */
.award-badge {
    display: inline-block;
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    color: var(--navy);
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin: 0.5rem 0;
    box-shadow: 0 2px 8px rgba(255, 215, 0, 0.3);
}

/* Service Content */
.service-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.service-links {
    display: flex;
    gap: 0.75rem;
    margin-top: auto;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--cyan) 0%, var(--cyan-dark) 100%);
    color: var(--white);
    border-radius: 25px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.service-link:hover {
    background: linear-gradient(135deg, var(--cyan-dark) 0%, var(--cyan) 100%);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 212, 255, 0.3);
}

.service-link i {
    font-size: 1rem;
}

/* Use Cases Section */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.use-case-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 2.5rem;
    border-radius: 16px;
    border: 2px solid rgba(197, 255, 0, 0.2);
    transition: var(--transition);
    text-align: center;
}

.use-case-card:hover {
    border-color: var(--lime);
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-6px);
    box-shadow: 0 12px 24px rgba(197, 255, 0, 0.15);
}

.use-case-card i {
    font-size: 3rem;
    color: var(--lime);
    margin-bottom: 1.5rem;
    display: block;
}

.use-case-card h3 {
    color: var(--white);
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.use-case-card p {
    color: var(--gray-200);
    line-height: 1.8;
}

/* Certifications Section */
.cert-grid {
    max-width: 900px;
    margin: 0 auto 3rem;
}

.cert-category h3 {
    color: var(--navy);
    margin-bottom: 2rem;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.cert-timeline {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.cert-item {
    display: flex;
    align-items: flex-start;
    gap: 2rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, #ffffff 0%, var(--gray-50) 100%);
    border-radius: 12px;
    border-left: 4px solid var(--lime);
    transition: var(--transition);
}

.cert-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow);
}

.cert-year {
    font-weight: 700;
    color: var(--navy);
    font-size: 1.1rem;
    min-width: 60px;
    font-family: 'Poppins', sans-serif;
}

.cert-name {
    color: var(--gray-700);
    line-height: 1.6;
}

.tech-section-subtitle {
    text-align: center;
    margin: 3rem 0 2rem;
    font-size: 2rem;
    color: var(--navy);
}

/* Profile Links Enhancement */
.profile-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.profile-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.7rem 1.3rem;
    background-color: var(--lime);
    color: var(--navy);
    border-radius: 25px;
    font-weight: 600;
    transition: var(--transition);
    font-size: 0.9rem;
}

.profile-link:hover {
    background-color: var(--lime-dark);
    transform: translateY(-2px);
}

.profile-link i {
    font-size: 1rem;
}

/* Achievement Card Enhancement */
.achievement-card {
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(197, 255, 0, 0.2);
}

.achievement-card:hover {
    border-color: var(--lime);
    background: rgba(255, 255, 255, 0.08);
}

.achievement-card h3 {
    color: var(--lime);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.achievement-card ul {
    list-style: none;
}

.achievement-card li {
    margin-bottom: 1.5rem;
    padding-left: 0;
    color: var(--gray-200);
}

.achievement-card li::before {
    content: '';
    display: none;
}

.achievement-card strong {
    color: var(--white);
    font-size: 1.1rem;
}

.achievement-card a {
    color: var(--white);
    border-bottom-color: transparent;
}

.achievement-card a:hover {
    color: var(--lime);
    border-bottom-color: var(--lime);
}

/* Achievements CTA: prevent text color change on hover */
#achievements .achievement-card .cta-button:hover {
    color: var(--navy);
    border-bottom-color: transparent;
}

/* Footer Links Enhancement */
.footer-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    font-size: 1.5rem;
    transition: var(--transition);
}

/* Cookie Notice */
.cookie-notice {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--navy);
    color: var(--white);
    padding: 1rem;
    text-align: center;
    z-index: 1000;
    display: none;
}

.cookie-notice.show {
    display: block;
}

.cookie-button {
    display: inline-block;
    padding: 0.5rem 1rem;
    margin-left: 1rem;
    border: none;
    border-radius: 5px;
    background-color: var(--lime);
    color: var(--navy);
    cursor: pointer;
    transition: var(--transition);
}

.cookie-button:hover {
    background-color: var(--lime-dark);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .main-title {
        font-size: 2.2rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .section {
        padding: 60px 0;
    }

    .hero-cta {
        display: flex;
        flex-direction: column;
        gap: 1rem;
        width: 100%;
        max-width: 300px;
        margin: 0 auto;
    }

    .hero-cta .cta-button {
        width: 100%;
    }

    .vision-statement {
        font-size: 1.5rem;
    }

    .strength-cards {
        grid-template-columns: 1fr;
    }

    .tech-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .profile-text h3 {
        font-size: 1.75rem;
    }

    .profile-role {
        font-size: 1rem;
    }

    .profile-links {
        flex-direction: column;
        align-items: stretch;
    }

    .profile-link {
        width: 100%;
        justify-content: center;
    }

    .achievement-card {
        padding: 1.5rem;
    }

    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    .cert-item {
        flex-direction: column;
        gap: 0.5rem;
    }

    .service-links {
        flex-direction: column;
    }

    .service-link {
        width: 100%;
        justify-content: center;
    }

    .menu-toggle {
        display: block;
        width: 30px;
        height: 30px;
        background: none;
        border: none;
        cursor: pointer;
        padding: 0;
        position: relative;
        z-index: 1000;
    }

    .menu-toggle span {
        display: block;
        width: 25px;
        height: 2px;
        background-color: var(--navy);
        margin: 5px auto;
        transition: all 0.3s ease-in-out;
        position: relative;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--white);
        flex-direction: column;
        align-items: center;
        padding: 2rem 0;
        gap: 1.5rem;
        transform: translateY(-100%);
        opacity: 0;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
    }

    .nav-menu .cta-button {
        margin-left: 0;
    }

    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 2rem;
    }

    .service-card {
        min-height: auto;
        padding: 2rem 1.5rem;
    }

    .service-image {
        width: 160px;
        height: 130px;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }

    .strength-cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .profile-links {
        max-width: 600px;
        margin: 0 auto;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 1s ease forwards;
}