:root {
    --color-bg-dark: #050510;
    --color-bg-card: #0F1020;
    --color-primary: #E60050;
    --color-primary-glow: rgba(230, 0, 80, 0.6);
    --color-accent: #1e3a8a;
    --color-text-main: #FFFFFF;
    --color-text-muted: #A0A0B0;
    --font-main: 'Inter', sans-serif;
    --font-jp: 'Noto Sans JP', sans-serif;
    --transition-speed: 0.3s;
}

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

body {
    background-color: var(--color-bg-dark);
    color: var(--color-text-main);
    font-family: var(--font-main), var(--font-jp);
    line-height: 1.6;
    overflow-x: hidden;
    scroll-behavior: smooth;
    background-image:
        radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        radial-gradient(circle at 10% 20%, rgba(230, 0, 80, 0.05) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(30, 58, 138, 0.05) 0%, transparent 20%);
    background-size: 24px 24px, auto, auto;
    background-attachment: fixed;
}

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

ul {
    list-style: none;
}

/* Background Effect */
.cursor-glow {
    position: fixed;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 60%);
    border-radius: 50%;
    pointer-events: none;
    transform: translate(-50%, -50%);
    z-index: -1;
    opacity: 0.4;
    transition: top 0.08s ease-out, left 0.08s ease-out;
}

/* Header */
#header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 50px;
    background: rgba(5, 5, 16, 0.7);
    backdrop-filter: blur(15px);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    transition: padding 0.3s ease, background 0.3s ease;
}

#header.scrolled {
    padding: 15px 50px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
    background: linear-gradient(45deg, #fff, var(--color-primary));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: transform 0.3s;
}

.logo:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-item {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-text-muted);
    position: relative;
    padding: 5px 0;
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition-speed);
    box-shadow: 0 0 10px var(--color-primary);
}

.nav-item:hover,
.nav-item.active {
    color: var(--color-text-main);
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
}

.nav-item:hover::after,
.nav-item.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background-color: var(--color-text-main);
}

/* Hero Section */
#hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    padding-top: 60px;
    overflow: hidden;
}

#hero::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: radial-gradient(transparent, var(--color-bg-dark)), url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjAiIGhlaWdodD0iMjAiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PGNpcmNsZSBjeD0iMiIgY3k9IjIiIHI9IjEiIGZpbGw9InJnYmEoMjU1LDI1NSwyNTUsMC4wNSkiLz48L3N2Zz4=');
    opacity: 0.5;
    animation: rotateBg 60s linear infinite;
    z-index: -2;
}

@keyframes rotateBg {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.hero-content h1 {
    font-size: 5rem;
    font-weight: 800;
    margin-bottom: 10px;
    letter-spacing: -2px;
    background: linear-gradient(135deg, #fff 70%, var(--color-primary) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 10px 40px rgba(0, 0, 0, 0.8), 0 0 20px rgba(230, 0, 80, 0.3);
    opacity: 0;
    animation: fadeInUp 1s forwards 0.2s;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--color-text-muted);
    margin-bottom: 30px;
    font-weight: 300;
    opacity: 0;
    animation: fadeInUp 1s forwards 0.4s;
}

.profile-summary {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
    opacity: 0;
    animation: fadeInUp 1s forwards 0.6s;
}

.hobbies {
    display: flex;
    gap: 20px;
    font-size: 1.1rem;
}

.hobbies span {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    padding: 8px 15px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition-speed);
}

.hobbies span:hover {
    background: rgba(230, 0, 80, 0.1);
    border-color: var(--color-primary);
    transform: translateY(-3px);
}

.hobbies span i {
    color: var(--color-primary);
    margin-right: 8px;
}

.scroll-down {
    position: absolute;
    bottom: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    animation: bounce 2s infinite;
    cursor: pointer;
    transition: color 0.3s;
}

.scroll-down:hover {
    color: var(--color-primary);
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(-10px);
    }

    60% {
        transform: translateY(-5px);
    }
}

/* Sections General */
.section-padding {
    padding: 100px 50px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

.section-title {
    font-size: 3rem;
    margin-bottom: 80px;
    text-align: center;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translate(-50%, 30px);
    opacity: 0;
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.section-title.visible {
    opacity: 1;
    transform: translate(-50%, 0);
}

.section-title::before {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 120%;
    height: 4px;
    background-color: var(--color-primary);
    border-radius: 2px;
    box-shadow: 0 0 15px var(--color-primary);
    transition: width 0.3s ease;
}

.section-title:hover::before {
    width: 140%;
}

/* Bio Text */
.bio-text {
    font-size: 1.1rem;
    line-height: 2;
    color: #ddd;
    text-align: justify;
}

.bio-paragraph {
    opacity: 0;
    transform: translateX(-20px);
    transition: all 0.8s ease-out;
    margin-bottom: 20px;
}

.bio-paragraph.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 30px;
    text-align: center;
}

.skill-card {
    background: var(--color-bg-card);
    padding: 30px 20px;
    border-radius: 15px;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid rgba(255, 255, 255, 0.05);
    opacity: 0;
    /* JS handles fade in */
    transform: translateY(20px);
}

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

.skill-card:hover {
    transform: translateY(-15px) scale(1.03);
    box-shadow: 0 15px 30px rgba(230, 0, 80, 0.15);
    border-color: var(--color-primary);
    background: linear-gradient(145deg, #151628, #0e0f1d);
}

.skill-card i,
.skill-icon {
    font-size: 3rem;
    height: 3rem;
    /* For images */
    width: auto;
    /* Maintain aspect ratio */
    margin-bottom: 15px;
    display: inline-block;
    transition: transform 0.3s;
}

.skill-card:hover i,
.skill-card:hover .skill-icon {
    transform: scale(1.2) rotate(5deg);
}

.icon-custom {
    color: var(--color-text-main);
}

.skill-card h3 {
    font-size: 1rem;
    font-weight: 500;
}

/* History */
.history-timeline {
    border-left: 3px solid rgba(230, 0, 80, 0.3);
    padding-left: 30px;
    margin-left: 10px;
}

.timeline-item {
    margin-bottom: 40px;
    position: relative;
    opacity: 0;
    transform: translateX(-20px);
    transition: all 0.6s ease-out;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -44.5px;
    top: 31px;
    width: 20px;
    height: 20px;
    background: var(--color-bg-dark);
    border: 3px solid var(--color-primary);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--color-primary);
    transition: background 0.3s, box-shadow 0.3s;
}

.timeline-item:hover::before {
    background: var(--color-primary);
    box-shadow: 0 0 20px var(--color-primary);
}

.date {
    font-size: 0.9rem;
    color: var(--color-primary);
    font-weight: 700;
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 1px;
    /* Optional: Indent date to distinguish from title? No, user didn't ask. */
}

.timeline-item .content h3 {
    font-size: 1.3rem;
    margin-bottom: 5px;
}

.timeline-item .content p {
    color: var(--color-text-muted);
}

.link-text {
    color: var(--color-primary);
    text-decoration: underline;
    transition: color 0.3s;
}

.link-text:hover {
    color: #fff;
    text-shadow: 0 0 5px var(--color-primary);
}

/* Products */
.subsection-title {
    font-size: 1.5rem;
    margin-bottom: 30px;
    margin-top: 50px;
    border-left: 4px solid var(--color-primary);
    padding-left: 15px;
    opacity: 0;
    transform: translateX(-20px);
}

.subsection-title.visible {
    opacity: 1;
    transform: translateX(0);
    transition: 0.6s ease;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.product-card {
    background: var(--color-bg-card);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
}

.product-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.product-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom right, rgba(230, 0, 80, 0.1), transparent);
    opacity: 0;
    transition: opacity 0.4s;
}

.product-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-primary);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.product-card:hover::after {
    opacity: 1;
}

.product-card h4 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: #fff;
    position: relative;
    z-index: 1;
}

.product-card.has-badge h4 {
    padding-right: 80px;
}

.product-card p {
    position: relative;
    z-index: 1;
    color: var(--color-text-muted);
}

.badge {
    position: absolute;
    top: 25px;
    /* Center with title */
    right: 20px;
    background: var(--color-primary);
    color: white;
    font-size: 0.7rem;
    padding: 3px 8px;
    border-radius: 20px;
    z-index: 2;
    box-shadow: 0 2px 10px rgba(230, 0, 80, 0.4);
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.video-item {
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
    transition: transform 0.3s, border-color 0.3s;
    border: 1px solid transparent;
}

.video-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.video-item:hover {
    border-color: var(--color-primary);
    transform: scale(1.02);
}

.video-item p {
    padding: 15px;
    font-size: 0.9rem;
    text-align: center;
    color: #ccc;
    background: var(--color-bg-card);
}

/* Info / Footer */
.social-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.social-btn {
    width: 60px;
    height: 60px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    font-size: 1.5rem;
    transition: all 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    position: relative;
    overflow: hidden;
    color: var(--color-text-main);
}

.social-icon-img {
    width: 28px;
    height: 28px;
    object-fit: contain;
    transition: transform 0.3s;
}

.social-btn i,
.social-btn img {
    position: relative;
    z-index: 10;
}

.social-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    background: var(--color-primary);
    border-radius: 50%;
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
    transition: transform 0.4s ease, opacity 0.4s ease;
    z-index: 0;
}

.social-btn:hover::before {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
}

.social-btn:hover {
    border-color: var(--color-primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(230, 0, 80, 0.3);
}

.footer {
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 40px 0;
    color: #555;
    font-size: 0.9rem;
}

/* Animations Support Classes */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

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

/* Responsive */
@media (max-width: 768px) {
    #header {
        padding: 15px 20px;
    }

    .hero-content h1 {
        font-size: 3rem;
    }

    .section-padding {
        padding: 80px 20px;
    }

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

/* Video Link Cards */
.video-link-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 30px;
    padding: 0;
    list-style: none;
}

.video-link-list li {
    margin: 0;
    padding: 0;
}

.video-link-list li::before {
    display: none;
}

.video-link-list a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--color-bg-card);
    padding: 20px 25px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: #fff;
    text-decoration: none;
    transition: all 0.3s ease;
    font-family: var(--font-code);
    font-size: 0.95rem;
}

.video-link-list a:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    color: #fff;
}

.video-link-list a i {
    color: var(--color-primary);
    font-size: 0.9rem;
    transition: transform 0.3s;
}

.video-link-list a:hover i {
    transform: translateX(5px) scale(1.1);
}

/* Flower Animation */
#flower-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.flower-petal {
    position: absolute;
    top: -50px;
    background-color: var(--color-primary);
    opacity: 0.8;
    border-radius: 50% 0 50% 0;
    /* Durations will be overridden by JS */
    animation: fall 10s linear infinite, sway 3s ease-in-out infinite alternate, rotate 5s linear infinite;
    transform-style: preserve-3d;
}

@keyframes fall {
    0% {
        top: -10%;
    }

    100% {
        top: 110%;
    }
}

@keyframes sway {
    0% {
        margin-left: -30px;
    }

    100% {
        margin-left: 30px;
    }
}

@keyframes rotate {
    0% {
        transform: rotateX(0deg) rotateY(0deg) rotateZ(0deg);
    }

    100% {
        transform: rotateX(360deg) rotateY(360deg) rotateZ(360deg);
    }
}

/* Repository Icon */
.repo-icon {
    font-size: 1.2rem;
    margin-left: 8px;
    color: var(--color-text-muted);
    transition: all 0.3s ease;
    vertical-align: middle;
}

.product-card:hover .repo-icon {
    color: var(--color-primary);
    transform: rotate(15deg) scale(1.1);
}