:root {
    --bg-color: #fbfbfb;
    /* Subtle off-white */
    --text-primary: #1d1d1f;
    /* Near black */
    --text-secondary: #6e6e73;
    /* Modern gray */
    --accent-color: #2c3e50;
    /* Subtle professional blue-gray */
    --accent-light: #f5f7fa;
    --border-color: #e5e5e7;
    --white: #ffffff;
    --nav-height: 70px;
    --container-width: 1000px;
    --transition-subtle: all 0.3s ease-out;
    --shadow-subtle: 0 2px 12px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Montserrat', 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography */
h1,
h2,
h3 {
    font-weight: 600;
    letter-spacing: -0.01em;
}

.section-title {
    font-size: 1.75rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    padding-bottom: 0.8rem;
    display: inline-block;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 4px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.8rem;
    border-radius: 6px;
    /* Slightly more professional than fully rounded */
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-subtle);
    cursor: pointer;
    font-size: 0.9rem;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--white);
    border: 1px solid var(--accent-color);
}

.btn-primary:hover {
    background-color: #1a252f;
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--accent-light);
    border-color: var(--accent-color);
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-hover);
}

/* Navbar */
.navbar {
    position: sticky;
    top: 0;
    height: var(--nav-height);
    background: rgba(251, 251, 251, 0.85);
    /* Matching off-white with transparency */
    backdrop-filter: saturate(180%) blur(20px);
    z-index: 1000;
    display: flex;
    align-items: center;
    border-bottom: 1px solid transparent;
    transition: var(--transition-subtle);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.8rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition-subtle);
}

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

.nav-resume {
    color: var(--accent-color) !important;
    font-weight: 600 !important;
}

.nav-right {
    display: flex;
    align-items: center;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    margin-left: 0.5rem;
}

.lang-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-weight: 500;
}

.lang-btn.active {
    color: var(--text-primary);
    font-weight: 700;
}

/* Status Indicator */
.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-left: 1rem;
    position: relative;
    cursor: pointer;
    transition: var(--transition-subtle);
}

.status-dot.green {
    background-color: #2ecc71;
    box-shadow: 0 0 8px rgba(46, 204, 113, 0.4);
}

.status-dot.red {
    background-color: #e74c3c;
    box-shadow: 0 0 8px rgba(231, 76, 60, 0.4);
}

.status-dot::after {
    content: attr(data-tooltip);
    position: absolute;
    top: calc(100% + 12px);
    right: -5px;
    background: var(--accent-color);
    color: var(--white);
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    pointer-events: none;
}

/* Tooltip Arrow */
.status-dot::before {
    content: '';
    position: absolute;
    top: calc(100% + 4px);
    right: 1px;
    border: 4px solid transparent;
    border-bottom-color: var(--accent-color);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.status-dot:hover::after,
.status-dot:hover::before {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.status-dot:hover {
    transform: scale(1.2);
}

/* Hero Section */
.hero {
    min-height: 60vh;
    display: flex;
    align-items: center;
    padding-top: var(--nav-height);
}

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

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 550px;
    margin-bottom: 2rem;
    font-weight: 400;
}

.hero-btns {
    display: flex;
    gap: 1rem;
}

/* About Section */
section {
    padding: 50px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    align-items: flex-start;
}

.profile-img-container {
    width: 100%;
    aspect-ratio: 1;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border-color);
}

.profile-img-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.about-quote {
    font-style: italic;
    font-weight: 550;
    color: var(--text-primary) !important;
    font-size: 1.15rem !important;
    margin-top: 2rem;
    padding-left: 1.5rem;
    border-left: 3px solid var(--accent-color);
}

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

.work-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition-subtle);
}

.work-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
    border-color: var(--accent-color);
}

.work-thumb {
    width: 100%;
    aspect-ratio: 16/10;
    overflow: hidden;
    background: var(--accent-light);
}

.work-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.work-card:hover .work-thumb img {
    transform: scale(1.05);
}

.work-info {
    padding: 2rem;
}

.work-points {
    list-style: none;
    margin-top: 1.5rem;
}

.work-points li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.work-points li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}


.work-info h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.work-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Education Section */
.timeline {
    border-left: 2px solid var(--border-color);
    padding-left: 2rem;
}

.timeline-item {
    margin-bottom: 3rem;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-2rem - 7px);
    top: 0.5rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--white);
    border: 2px solid var(--accent-color);
}

.time {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.info h3 {
    font-size: 1.15rem;
    margin-bottom: 0.2rem;
}

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

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
}

.skill-category h3 {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.skill-list {
    list-style: none;
}

.skill-item {
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
}

.skill-item:last-child {
    border-bottom: none;
}

/* Contact Section */
.contact-container {
    max-width: 600px;
    margin: 0 auto;
}

.contact-form {
    display: grid;
    gap: 1.2rem;
}

.form-input {
    width: 100%;
    padding: 0.85rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--white);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition-subtle);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.1);
}

/* Footer */
footer {
    padding: 3rem 0;
    background-color: #f2f2f3;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.footer-socials {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.footer-socials a {
    text-decoration: none;
    color: var(--text-secondary);
    transition: var(--transition-subtle);
}

.footer-socials a:hover {
    color: var(--accent-color);
    transform: translateY(-2px);
}

.footer-socials a i {
    margin-right: 8px;
    font-size: 1.1rem;
}

/* Responsive */
@media (max-width: 992px) {
    .hero-container {
        flex-direction: column-reverse;
        text-align: center;
        gap: 2rem;
    }

    .hero-btns {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 1.5rem;
    }
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
    will-change: opacity, transform;
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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