/* ========================================
   CSS Variables & Design Tokens
   ======================================== */
:root {
    /* Colors - Light Mode with Vibrant Accents */
    --color-bg: #fafbfc;
    --color-bg-secondary: #ffffff;
    --color-text-primary: #1a1a2e;
    --color-text-secondary: #4a4a68;
    --color-text-muted: #8888a0;

    /* Gradient Colors */
    --gradient-1: #667eea;
    --gradient-2: #764ba2;
    --gradient-3: #f093fb;
    --gradient-4: #f5576c;
    --gradient-5: #4facfe;
    --gradient-6: #00f2fe;

    /* Accent */
    --color-accent: #667eea;
    --color-accent-light: rgba(102, 126, 234, 0.1);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 60px rgba(102, 126, 234, 0.3);

    /* Typography */
    --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-2xl: 8rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Animated Background
   ======================================== */
.bg-container {
    position: fixed;
    inset: 0;
    z-index: -2;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, var(--gradient-3), var(--gradient-4));
    bottom: -150px;
    left: -100px;
    animation-delay: -7s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, var(--gradient-5), var(--gradient-6));
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    25% {
        transform: translate(30px, -30px) scale(1.05);
    }

    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }

    75% {
        transform: translate(-30px, -20px) scale(1.02);
    }
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(102, 126, 234, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(102, 126, 234, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

/* ========================================
   Particle Canvas
   ======================================== */
#particles {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
}

/* ========================================
   Main Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    position: relative;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }

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

/* ========================================
   Profile Section
   ======================================== */
.profile-section {
    margin-bottom: var(--space-xl);
}

.avatar-container {
    position: relative;
    width: 160px;
    height: 160px;
    margin: 0 auto;
}

.avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    position: relative;
    z-index: 2;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-bounce);
}

.avatar-container:hover .avatar {
    transform: scale(1.05);
}

.avatar-ring {
    position: absolute;
    inset: -8px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2), var(--gradient-3));
    z-index: 1;
    animation: spin 8s linear infinite;
}

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

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

.avatar-glow {
    position: absolute;
    inset: -20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    filter: blur(30px);
    opacity: 0.4;
    z-index: 0;
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 0.4;
        transform: scale(1);
    }

    50% {
        opacity: 0.6;
        transform: scale(1.1);
    }
}

/* ========================================
   Text Section
   ======================================== */
.text-section {
    margin-bottom: var(--space-xl);
}

.greeting {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
    animation: fadeInUp 1s ease-out 0.2s backwards;
}

.name {
    margin-bottom: var(--space-md);
    animation: fadeInUp 1s ease-out 0.3s backwards;
}

.name-main {
    display: block;
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 900;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2), var(--gradient-3));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.name-sub {
    display: block;
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    margin-top: var(--space-sm);
}

.title-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    animation: fadeInUp 1s ease-out 0.4s backwards;
}

.title-bracket {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--gradient-1);
    opacity: 0.6;
    font-family: 'SF Mono', 'Fira Code', monospace;
}

.title {
    font-size: clamp(1.25rem, 4vw, 1.75rem);
    font-weight: 600;
    color: var(--color-text-primary);
}

.title-text {
    position: relative;
}

.title-text::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--gradient-1), var(--gradient-2));
    border-radius: 2px;
    transform: scaleX(0);
    transform-origin: left;
    animation: underline 1s ease-out 1s forwards;
}

@keyframes underline {
    to {
        transform: scaleX(1);
    }
}

.tagline {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    animation: fadeInUp 1s ease-out 0.5s backwards;
}

.tagline-emphasis {
    font-weight: 700;
    background: linear-gradient(135deg, var(--gradient-4), var(--gradient-1));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.tagline-break {
    display: none;
}

@media (max-width: 480px) {
    .tagline-break {
        display: block;
        height: var(--space-xs);
    }
}

/* ========================================
   Social Links
   ======================================== */
.social-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
    animation: fadeInUp 1s ease-out 0.6s backwards;
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-secondary);
    border: 1px solid rgba(102, 126, 234, 0.1);
    border-radius: 100px;
    text-decoration: none;
    color: var(--color-text-primary);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.social-link:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md), 0 0 20px rgba(102, 126, 234, 0.15);
    border-color: var(--gradient-1);
}

.social-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
}

.social-link:hover .social-icon {
    transform: scale(1.1);
}

.social-icon svg {
    width: 18px;
    height: 18px;
}

.social-label {
    transition: color var(--transition-fast);
}

/* Special styling for wao link */
.social-link-wao {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
}

.social-link-wao:hover {
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    color: white;
}

/* Mobile: Hide labels */
@media (max-width: 600px) {
    .social-label {
        display: none;
    }

    .social-link {
        padding: var(--space-md);
        border-radius: 50%;
    }

    .social-icon {
        width: 28px;
        height: 28px;
    }

    .social-icon svg {
        width: 22px;
        height: 22px;
    }
}

/* ========================================
   Scroll Indicator
   ======================================== */
.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-muted);
    animation: fadeInUp 1s ease-out 0.8s backwards;
}

.scroll-text {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {

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

    50% {
        transform: translateY(8px);
    }
}

.scroll-arrow svg {
    width: 100%;
    height: 100%;
    stroke: var(--color-text-muted);
}

/* ========================================
   Corner Decorations
   ======================================== */
.corner-decoration {
    position: fixed;
    width: 150px;
    height: 150px;
    pointer-events: none;
    opacity: 0.3;
}

.corner-decoration::before,
.corner-decoration::after {
    content: '';
    position: absolute;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
}

.top-left {
    top: 20px;
    left: 20px;
}

.top-left::before {
    width: 80px;
    height: 2px;
    top: 0;
    left: 0;
}

.top-left::after {
    width: 2px;
    height: 80px;
    top: 0;
    left: 0;
}

.top-right {
    top: 20px;
    right: 20px;
}

.top-right::before {
    width: 80px;
    height: 2px;
    top: 0;
    right: 0;
}

.top-right::after {
    width: 2px;
    height: 80px;
    top: 0;
    right: 0;
}

.bottom-left {
    bottom: 20px;
    left: 20px;
}

.bottom-left::before {
    width: 80px;
    height: 2px;
    bottom: 0;
    left: 0;
}

.bottom-left::after {
    width: 2px;
    height: 80px;
    bottom: 0;
    left: 0;
}

.bottom-right {
    bottom: 20px;
    right: 20px;
}

.bottom-right::before {
    width: 80px;
    height: 2px;
    bottom: 0;
    right: 0;
}

.bottom-right::after {
    width: 2px;
    height: 80px;
    bottom: 0;
    right: 0;
}

/* Hide on mobile */
@media (max-width: 768px) {
    .corner-decoration {
        display: none;
    }
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 768px) {
    .hero {
        padding: var(--space-md);
    }

    .avatar-container {
        width: 120px;
        height: 120px;
    }

    .profile-section {
        margin-bottom: var(--space-lg);
    }

    .text-section {
        margin-bottom: var(--space-lg);
    }

    .gradient-orb {
        opacity: 0.3;
    }

    .orb-1 {
        width: 400px;
        height: 400px;
    }

    .orb-2 {
        width: 350px;
        height: 350px;
    }

    .orb-3 {
        width: 300px;
        height: 300px;
    }
}

@media (max-width: 480px) {
    .name-sub {
        font-size: 1rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .social-links {
        gap: var(--space-sm);
    }
}

/* ========================================
   Accessibility & Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .gradient-orb {
        animation: none;
    }

    .avatar-ring {
        animation: none;
    }
}

/* Focus styles for accessibility */
.social-link:focus-visible {
    outline: 3px solid var(--gradient-1);
    outline-offset: 3px;
}

/* Selection styling */
::selection {
    background: rgba(102, 126, 234, 0.2);
    color: var(--color-text-primary);
}

/* ========================================
   Skills Section
   ======================================== */
.skills-section {
    min-height: 100vh;
    padding: var(--space-2xl) var(--space-lg);
    position: relative;
    background: linear-gradient(180deg, var(--color-bg) 0%, rgba(102, 126, 234, 0.03) 100%);
}

.skills-container {
    max-width: 900px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: var(--space-xl);
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

.section-title.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Primary Skills Cards */
.primary-skills {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.skill-card {
    background: var(--color-bg-secondary);
    border-radius: 20px;
    padding: var(--space-lg);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(102, 126, 234, 0.1);
    transition: all var(--transition-base);
    opacity: 0;
    transform: translateY(40px);
}

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

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--gradient-1), var(--gradient-2), var(--gradient-3));
}

.skill-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(102, 126, 234, 0.15);
}

.skill-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
    color: white;
    transition: transform var(--transition-bounce);
}

.skill-card:hover .skill-icon {
    transform: scale(1.1) rotate(-5deg);
}

.skill-icon svg {
    width: 28px;
    height: 28px;
}

.skill-content {
    margin-bottom: var(--space-sm);
}

.skill-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.skill-desc {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.skill-badge {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 100px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Technology Cloud */
.tech-cloud-wrapper {
    text-align: center;
    margin-bottom: var(--space-xl);
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out 0.2s;
}

.tech-cloud-wrapper.visible {
    opacity: 1;
    transform: translateY(0);
}

.tech-cloud-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-lg);
}

.tech-cloud {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
    max-width: 700px;
    margin: 0 auto;
}

.tech-tag {
    display: inline-block;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-secondary);
    border: 1px solid rgba(102, 126, 234, 0.15);
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-primary);
    transition: all var(--transition-base);
    cursor: default;
    opacity: 0;
    transform: scale(0.8);
    animation: tagAppear 0.5s ease-out forwards;
    animation-delay: calc(var(--delay) * 0.08s + 0.5s);
}

@keyframes tagAppear {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.tech-tag:hover {
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    color: white;
    border-color: transparent;
    transform: scale(1.08);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

/* Philosophy Quote */
.philosophy {
    text-align: center;
    padding: var(--space-xl) 0;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out 0.4s;
}

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

.philosophy-quote {
    font-size: clamp(1.1rem, 3vw, 1.4rem);
    font-weight: 400;
    color: var(--color-text-secondary);
    font-style: italic;
    line-height: 1.8;
    max-width: 500px;
    margin: 0 auto;
    position: relative;
    padding: var(--space-lg);
}

.philosophy-quote::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--gradient-1), var(--gradient-3));
    border-radius: 2px;
}

/* Skills Section Responsive */
@media (max-width: 768px) {
    .skills-section {
        padding: var(--space-xl) var(--space-md);
    }

    .primary-skills {
        grid-template-columns: 1fr;
    }

    .skill-card {
        padding: var(--space-md);
    }

    .skill-icon {
        width: 48px;
        height: 48px;
    }

    .skill-icon svg {
        width: 24px;
        height: 24px;
    }

    .skill-name {
        font-size: 1.25rem;
    }

    .tech-tag {
        font-size: 0.8rem;
        padding: var(--space-xs) var(--space-sm);
    }
}

@media (max-width: 480px) {
    .philosophy-quote {
        font-size: 1rem;
        padding: var(--space-md);
    }
}