/* ============================================================
   CSS Custom Properties (Design Tokens)
   ============================================================ */
:root {
    /* Colors */
    --color-bg-dark:        #111827;
    --color-bg-dark-alt:    #1F2937;
    --color-bg-light:       #F9FAFB;
    --color-bg-white:       #FFFFFF;
    --color-accent:         #2563EB;
    --color-accent-hover:   #1D4ED8;
    --color-accent-dark:    #1e40af;
    --color-accent-aws:     #FF9900;
    --color-success:        #10B981;
    --color-success-dark:   #065f46;
    --color-error:          #ef4444;
    --color-error-dark:     #991b1b;

    /* AWS feature card colors */
    --color-aws-bg-from:     #1a1200;
    --color-aws-bg-to:       #291c00;
    --color-aws-text-light:  #d4b483;
    --color-aws-text-mid:    #c8a96e;
    --color-aws-text-dark:   #a08040;

    --color-text-light:     #E5E7EB;
    --color-text-light-sub: #9CA3AF;
    --color-text-dark:      #1F2937;
    --color-text-body:      #374151;
    --color-text-sub-light: #6B7280;
    --color-placeholder:    #c4c9d4;

    --color-border-dark:    #374151;
    --color-border-light:   #E5E7EB;

    /* Typography */
    --font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs:   0.75rem;
    --font-size-sm:   0.875rem;
    --font-size-base: 1rem;
    --font-size-lg:   1.125rem;
    --font-size-xl:   1.25rem;
    --font-size-2xl:  1.5rem;
    --font-size-3xl:  2rem;
    --font-size-4xl:  2.5rem;
    --font-size-5xl:  clamp(2.5rem, 6vw, 4rem);

    /* Spacing */
    --spacing-xs:  0.5rem;
    --spacing-sm:  1rem;
    --spacing-md:  1.5rem;
    --spacing-lg:  2rem;
    --spacing-xl:  3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md:  0 4px 12px rgba(0, 0, 0, 0.10);
    --shadow-lg:  0 10px 30px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.25);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.6s ease;

    /* Layout */
    --container-max: 1100px;
    --header-height: 64px;
}


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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.8;
    color: var(--color-text-body);
    background-color: var(--color-bg-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
    color: var(--color-accent-hover);
}

ul,
ol {
    list-style: none;
}

/* ============================================================
   Accessibility: Skip Link
   ============================================================ */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    z-index: 9999;
    padding: 0.75rem 1.5rem;
    background-color: var(--color-accent);
    color: #fff;
    font-weight: 600;
    border-radius: 0 0 var(--radius-md) 0;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
    color: #fff;
}


/* ============================================================
   Responsive Utility: Breakpoint-specific line breaks
   ============================================================ */
/* SPのみ改行（768px未満で表示、それ以上は非表示） */
.sp-only {
    display: none;
}
@media (max-width: 767px) {
    .sp-only {
        display: inline;
    }
}

/* PCのみ改行（768px以上で表示、未満は非表示） */
.pc-only {
    display: inline;
}
@media (max-width: 767px) {
    .pc-only {
        display: none;
    }
}


/* ============================================================
   Layout
   ============================================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
}

.section {
    padding: var(--spacing-3xl) 0;
}

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

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.05em;
    color: var(--color-text-dark);
}

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

.section-lead {
    text-align: center;
    color: var(--color-text-sub-light);
    margin-bottom: var(--spacing-2xl);
    font-size: var(--font-size-lg);
    line-height: 1.8;
}

.section--dark .section-lead {
    color: var(--color-text-light-sub);
}

.section-cta {
    text-align: center;
    margin-top: var(--spacing-2xl);
}


/* ============================================================
   Scroll Progress Bar
   ============================================================ */
.scroll-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 2px;
    width: 0%;
    background-color: var(--color-accent);
    transition: width 0.1s linear;
    z-index: 10;
}


/* ============================================================
   Buttons
   ============================================================ */
.btn {
    display: inline-block;
    padding: 0.75em 2em;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: var(--font-size-base);
    letter-spacing: 0.04em;
    border: 2px solid transparent;
    cursor: pointer;
    transition:
        background-color var(--transition-base),
        color var(--transition-base),
        border-color var(--transition-base),
        transform var(--transition-base),
        box-shadow var(--transition-base);
    text-align: center;
    line-height: 1.5;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn--primary {
    background-color: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

.btn--primary:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.btn--outline {
    background-color: transparent;
    color: var(--color-text-light);
    border-color: var(--color-text-light-sub);
}

.btn--outline:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-text-light);
    border-color: var(--color-text-light);
}

.btn--secondary {
    background-color: transparent;
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.btn--secondary:hover {
    background-color: var(--color-accent);
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.btn--full {
    display: block;
    width: 100%;
}


/* ============================================================
   Header / Navigation
   ============================================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background-color: rgba(17, 24, 39, 0.80);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transition: background-color var(--transition-base);
}

.site-header.is-scrolled {
    background-color: rgba(17, 24, 39, 0.98);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 100%;
    position: relative;
}

.nav-logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-light);
    letter-spacing: 0.1em;
    z-index: 1001;
}

.nav-logo:hover {
    color: var(--color-accent);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--color-text-light-sub);
    font-size: var(--font-size-sm);
    font-weight: 500;
    letter-spacing: 0.05em;
    transition: color var(--transition-base);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.is-active {
    color: var(--color-text-light);
}

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

.nav-link--cta {
    background-color: var(--color-accent);
    color: #fff !important;
    padding: 0.4em 1.2em;
    border-radius: var(--radius-sm);
    transition:
        background-color var(--transition-base),
        box-shadow var(--transition-base);
}

.nav-link--cta::after {
    display: none;
}

.nav-link--cta:hover {
    background-color: var(--color-accent-hover);
    color: #fff;
    box-shadow: var(--shadow-glow);
}

/* Hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
    width: 40px;
    height: 40px;
}

.nav-toggle-bar {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-light);
    border-radius: 2px;
    transition:
        transform var(--transition-base),
        opacity var(--transition-base);
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 767px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        inset: 0;
        flex-direction: column;
        justify-content: center;
        gap: var(--spacing-lg);
        background-color: var(--color-bg-dark);
        transform: translateX(100%);
        transition: transform var(--transition-slow);
        z-index: 1000;
    }

    .nav-menu.is-open {
        transform: translateX(0);
    }

    .nav-link {
        font-size: var(--font-size-xl);
        font-weight: 600;
    }

    .nav-link--cta {
        padding: 0.6em 2em;
        font-size: var(--font-size-lg);
    }

    .nav {
        padding: 0 var(--spacing-sm);
    }
}


/* ============================================================
   Hero
   ============================================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(
        135deg,
        #111827 0%,
        #1F2937 50%,
        #111827 100%
    );
    --cursor-x: 50%;
    --cursor-y: 50%;
}

/* カーソル追従の光演出 */
.hero-cursor-light {
    position: absolute;
    inset: 0;
    background: radial-gradient(
        600px circle at var(--cursor-x) var(--cursor-y),
        rgba(37, 99, 235, 0.12),
        transparent 70%
    );
    pointer-events: none;
    z-index: 0;
    transition: background 0.1s linear;
}

@media (pointer: coarse) {
    .hero-cursor-light {
        display: none;
    }
}

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

.hero-subtitle {
    color: var(--color-accent);
    font-size: var(--font-size-sm);
    font-weight: 500;
    letter-spacing: 0.15em;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--color-text-light);
    letter-spacing: 0.12em;
    line-height: 1.15;
    margin-bottom: var(--spacing-md);
}

.hero-tagline {
    color: var(--color-text-light-sub);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.8;
}

.hero-cta-group {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--color-success);
    padding: 0.4em 1em;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-success);
    flex-shrink: 0;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%       { opacity: 0.5; transform: scale(0.8); }
}

.hero-scroll {
    position: absolute;
    bottom: var(--spacing-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    z-index: 1;
}

.hero-scroll span {
    color: var(--color-text-light-sub);
    font-size: var(--font-size-xs);
    letter-spacing: 0.15em;
}

.hero-scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    animation: scrollLine 1.8s ease-in-out infinite;
}

@keyframes scrollLine {
    0%   { opacity: 1; transform: scaleY(1) translateY(0); }
    50%  { opacity: 0.4; transform: scaleY(0.6) translateY(8px); }
    100% { opacity: 1; transform: scaleY(1) translateY(0); }
}


/* ============================================================
   About
   ============================================================ */
.about {
    background-color: var(--color-bg-white);
}

.about-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

@media (max-width: 640px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }

    .about-avatar-wrap {
        display: flex;
        justify-content: center;
    }
}

/* イニシャルアバター */
.avatar-initial {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: #fff;
    letter-spacing: 0.05em;
    flex-shrink: 0;
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
}

.about-name {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.about-name-en {
    font-size: var(--font-size-sm);
    font-weight: 400;
    color: var(--color-text-sub-light);
    margin-left: var(--spacing-xs);
}

.about-role {
    color: var(--color-accent);
    font-weight: 600;
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

.about-text {
    color: var(--color-text-body);
    margin-bottom: var(--spacing-sm);
    line-height: 1.9;
}

.about-highlights {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

@media (max-width: 640px) {
    .about-highlights {
        justify-content: center;
    }
}

.about-highlight-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.about-highlight-num {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1.2;
}

.about-highlight-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-sub-light);
    text-align: center;
}


/* ============================================================
   Services
   ============================================================ */
.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

@media (max-width: 767px) {
    .services-grid {
        grid-template-columns: 1fr;
    }
}

.service-card {
    background-color: var(--color-bg-dark-alt);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    transition:
        border-color var(--transition-base),
        box-shadow var(--transition-base),
        transform var(--transition-base);
}

.service-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 0 24px rgba(37, 99, 235, 0.2);
    transform: translateY(-3px);
}

.service-card--featured {
    border-color: var(--color-accent);
    box-shadow: 0 0 16px rgba(37, 99, 235, 0.12);
    position: relative;
    grid-column: 1 / -1;
}

@media (max-width: 767px) {
    .service-card--featured {
        grid-column: auto;
    }
}

.service-card-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1;
}

.service-card-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.service-card-desc {
    color: var(--color-text-light-sub);
    font-size: var(--font-size-sm);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.service-card-target {
    font-size: var(--font-size-xs);
    color: var(--color-text-light-sub);
    background-color: rgba(37, 99, 235, 0.08);
    border-left: 2px solid var(--color-accent);
    padding: 0.5em 0.75em;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    line-height: 1.6;
    margin-top: auto;
}

.service-card-target-label {
    font-weight: 600;
    color: var(--color-accent);
    margin-right: 4px;
}


/* ============================================================
   Works
   ============================================================ */
.works {
    background-color: var(--color-bg-light);
}

.works-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

@media (max-width: 1023px) {
    .works-grid {
        grid-template-columns: 1fr;
    }
}

.work-card {
    background-color: var(--color-bg-white);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition:
        box-shadow var(--transition-base),
        transform var(--transition-base);
}

.work-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.work-card-header {
    background-color: var(--color-bg-dark);
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.work-card-title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text-light);
    line-height: 1.5;
}

.work-card-industry {
    font-size: var(--font-size-xs);
    color: var(--color-text-light-sub);
    background-color: rgba(255, 255, 255, 0.08);
    padding: 0.2em 0.6em;
    border-radius: var(--radius-full);
    align-self: flex-start;
}

.work-card-body {
    padding: var(--spacing-md);
}

.work-card-meta {
    margin-bottom: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.work-card-meta-row {
    display: grid;
    grid-template-columns: 5em 1fr;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.work-card-meta-row dt {
    color: var(--color-text-sub-light);
    font-weight: 500;
    flex-shrink: 0;
}

.work-card-meta-row dd {
    color: var(--color-text-dark);
    font-weight: 500;
}

.work-card-summary {
    font-size: var(--font-size-sm);
    color: var(--color-text-body);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.work-card-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tech-badge {
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-accent);
    background-color: rgba(37, 99, 235, 0.08);
    border: 1px solid rgba(37, 99, 235, 0.2);
    padding: 0.2em 0.6em;
    border-radius: var(--radius-full);
}


/* ============================================================
   Skills
   ============================================================ */
.skills-group {
    margin-bottom: var(--spacing-2xl);
}

.skills-group-label {
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-light-sub);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--color-border-dark);
}

/* Primary Stack */
.skills-primary-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

@media (min-width: 768px) {
    .skills-primary-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.skill-card-primary {
    background-color: var(--color-bg-dark-alt);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition:
        border-color var(--transition-base),
        transform var(--transition-base);
}

.skill-card-primary:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.skill-card-primary-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
    flex-wrap: wrap;
}

.skill-card-primary-header i {
    font-size: 1.6rem;
    line-height: 1;
}

.skill-name {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text-light);
}

.skill-years {
    font-size: var(--font-size-xs);
    color: var(--color-accent);
    background-color: rgba(37, 99, 235, 0.12);
    padding: 0.15em 0.5em;
    border-radius: var(--radius-full);
    margin-left: auto;
    white-space: nowrap;
}

.skill-desc {
    font-size: var(--font-size-xs);
    color: var(--color-text-light-sub);
    line-height: 1.7;
}

/* Infrastructure & Tools */
.skills-infra-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

@media (min-width: 640px) {
    .skills-infra-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.skill-card-infra {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 4px;
    background-color: var(--color-bg-dark-alt);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-sm);
    transition: border-color var(--transition-base);
}

.skill-card-infra:hover {
    border-color: var(--color-accent);
}

.skill-card-infra i {
    font-size: 2rem;
    line-height: 1;
    margin-bottom: 4px;
}

.skill-card-infra .skill-name {
    font-size: var(--font-size-sm);
}

.skill-card-infra .skill-years {
    margin-left: 0;
}

.skill-desc-sm {
    font-size: var(--font-size-xs);
    color: var(--color-text-light-sub);
    line-height: 1.5;
    margin-top: 4px;
}

/* Also Work With */
.skills-also-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.skill-badge {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-light-sub);
    background-color: var(--color-bg-dark-alt);
    border: 1px solid var(--color-border-dark);
    padding: 0.3em 0.8em;
    border-radius: var(--radius-full);
    transition:
        color var(--transition-base),
        border-color var(--transition-base);
}

.skill-badge:hover {
    color: var(--color-text-light);
    border-color: var(--color-accent);
}


/* ============================================================
   Certifications
   ============================================================ */
.certs {
    background-color: var(--color-bg-white);
}

/* AWS 3冠 フィーチャーカード */
.cert-feature {
    background: linear-gradient(135deg, var(--color-aws-bg-from) 0%, var(--color-aws-bg-to) 100%);
    border: 2px solid var(--color-accent-aws);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg) var(--spacing-xl);
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--spacing-lg);
    align-items: start;
    margin-bottom: var(--spacing-2xl);
    box-shadow: 0 0 32px rgba(255, 153, 0, 0.15);
}

@media (max-width: 640px) {
    .cert-feature {
        grid-template-columns: 1fr;
        padding: var(--spacing-md);
    }
}

.cert-feature-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: var(--color-accent-aws);
    font-weight: 700;
    font-size: var(--font-size-sm);
    min-width: 80px;
}

.cert-feature-badge i {
    font-size: 3rem;
    line-height: 1;
}

.cert-feature-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-accent-aws);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.cert-feature-desc {
    color: var(--color-aws-text-light);
    font-size: var(--font-size-sm);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.cert-feature-list {
    list-style: disc;
    padding-left: 1.2em;
    margin-bottom: var(--spacing-sm);
}

.cert-feature-list li {
    font-size: var(--font-size-sm);
    color: var(--color-aws-text-mid);
    line-height: 1.7;
}

.cert-feature-date {
    font-size: var(--font-size-sm);
    color: var(--color-aws-text-dark);
    font-weight: 500;
}

/* 高度情報処理 */
.certs-group-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--color-text-sub-light);
    text-transform: uppercase;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--color-border-light);
}

.certs-advanced {
    margin-bottom: var(--spacing-2xl);
}

.certs-advanced-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

@media (max-width: 767px) {
    .certs-advanced-grid {
        grid-template-columns: 1fr;
    }
}

.cert-card {
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition:
        box-shadow var(--transition-base),
        border-color var(--transition-base);
}

.cert-card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
}

.cert-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}

.cert-card-name {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text-dark);
    line-height: 1.4;
}

.cert-card-date {
    font-size: var(--font-size-xs);
    color: var(--color-text-sub-light);
    white-space: nowrap;
    flex-shrink: 0;
}

.cert-card-comment {
    font-size: var(--font-size-sm);
    color: var(--color-text-sub-light);
    line-height: 1.7;
}

/* その他の資格 (details) */
.certs-others {
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.certs-others-summary {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-body);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background-color: var(--color-bg-light);
    transition: background-color var(--transition-fast);
}

.certs-others-summary::-webkit-details-marker {
    display: none;
}

.certs-others-summary::before {
    content: '+';
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-accent);
    transition: transform var(--transition-base);
    line-height: 1;
}

.certs-others[open] .certs-others-summary::before {
    transform: rotate(45deg);
}

.certs-others-summary:hover {
    background-color: var(--color-border-light);
}

.certs-others-list {
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    background-color: var(--color-bg-white);
}

.certs-others-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.4em 0;
    border-bottom: 1px solid var(--color-border-light);
    font-size: var(--font-size-sm);
}

.certs-others-list li:last-child {
    border-bottom: none;
}

.certs-others-name {
    color: var(--color-text-body);
    font-weight: 500;
}

.certs-others-date {
    color: var(--color-text-sub-light);
    font-size: var(--font-size-xs);
    white-space: nowrap;
}


/* ============================================================
   Career / Timeline
   ============================================================ */
.timeline {
    position: relative;
    padding-left: var(--spacing-xl);
    max-width: 720px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(
        to bottom,
        var(--color-accent),
        rgba(37, 99, 235, 0.2)
    );
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-2xl);
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: calc(-1 * var(--spacing-xl) - 5px);
    top: 8px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--color-accent);
    border: 2px solid var(--color-bg-dark);
    box-shadow: 0 0 8px rgba(37, 99, 235, 0.5);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    flex-wrap: wrap;
}

.timeline-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-light);
    line-height: 1.4;
}

.timeline-period {
    font-size: var(--font-size-xs);
    color: var(--color-accent);
    font-weight: 500;
    white-space: nowrap;
    background-color: rgba(37, 99, 235, 0.12);
    padding: 0.2em 0.7em;
    border-radius: var(--radius-full);
}

.timeline-role {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-light-sub);
    margin-bottom: var(--spacing-xs);
}

.timeline-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-light-sub);
    line-height: 1.8;
}


/* ============================================================
   Contact
   ============================================================ */
.contact {
    background-color: var(--color-bg-light);
}

.contact-sub {
    text-align: center;
    color: var(--color-text-sub-light);
    font-size: var(--font-size-sm);
    margin-top: calc(-1 * var(--spacing-lg));
    margin-bottom: var(--spacing-2xl);
}

.contact-inner {
    max-width: 640px;
    margin: 0 auto;
}

.contact-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.25);
    color: var(--color-success);
    padding: 0.4em 1em;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
}

.contact-form {
    background-color: var(--color-bg-white);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

@media (max-width: 640px) {
    .contact-form {
        padding: var(--spacing-md);
    }
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-dark);
    margin-bottom: 6px;
}

.form-required {
    color: var(--color-error);
    margin-left: 4px;
}

.form-control {
    width: 100%;
    padding: 0.65em 0.9em;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    color: var(--color-text-dark);
    background-color: var(--color-bg-light);
    transition:
        border-color var(--transition-fast),
        box-shadow var(--transition-fast);
    outline: none;
    line-height: 1.6;
}

.form-control::placeholder {
    color: var(--color-placeholder);
}

.form-control:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    background-color: var(--color-bg-white);
}

.form-control.is-invalid {
    border-color: var(--color-error);
}

.form-control.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.12); /* --color-error に対応 */
}

.form-control--textarea {
    resize: vertical;
    min-height: 140px;
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236B7280' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.9em center;
    padding-right: 2.5em;
    cursor: pointer;
}

select.form-control:invalid {
    color: var(--color-text-sub-light);
}

.form-error {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--color-error);
    margin-top: 4px;
    min-height: 1em;
}

.form-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-align: center;
    display: none;
}

.form-message.is-success {
    display: block;
    background-color: rgba(16, 185, 129, 0.1);  /* --color-success に対応 */
    border: 1px solid rgba(16, 185, 129, 0.3);  /* --color-success に対応 */
    color: var(--color-success-dark);
}

.form-message.is-error {
    display: block;
    background-color: rgba(239, 68, 68, 0.08);  /* --color-error に対応 */
    border: 1px solid rgba(239, 68, 68, 0.25);  /* --color-error に対応 */
    color: var(--color-error-dark);
}

/* Confirm Modal */
.confirm-modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.confirm-modal-overlay.is-visible {
    opacity: 1;
}

.confirm-modal {
    background-color: var(--color-bg-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    max-width: 480px;
    width: 100%;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95);
    transition: transform var(--transition-base);
}

.confirm-modal-overlay.is-visible .confirm-modal {
    transform: scale(1);
}

.confirm-modal-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-md);
}

.confirm-modal-body {
    font-size: var(--font-size-sm);
    color: var(--color-text-body);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.confirm-modal-lead {
    margin-bottom: 0.75em;
}

.confirm-modal-message {
    white-space: pre-wrap;
}

.confirm-modal-body dl {
    background-color: var(--color-bg-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.confirm-modal-body dt {
    font-size: var(--font-size-xs);
    color: var(--color-text-sub-light);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: var(--spacing-xs);
}

.confirm-modal-body dd {
    color: var(--color-text-dark);
    font-weight: 500;
    word-break: break-all;
}

.confirm-modal-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}


/* ============================================================
   Footer
   ============================================================ */
.site-footer {
    background-color: var(--color-bg-dark);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border-dark);
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    text-align: center;
}

.footer-copy {
    color: var(--color-text-light-sub);
    font-size: var(--font-size-xs);
}

/* Back to Top ボタン */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 900;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--color-accent);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition:
        background-color var(--transition-base),
        opacity var(--transition-base),
        transform var(--transition-base);
    opacity: 0;
    transform: translateY(12px);
}

.back-to-top:not([hidden]) {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
}


/* ============================================================
   Footer Links
   ============================================================ */
.footer-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.footer-link {
    color: var(--color-text-light-sub);
    font-size: var(--font-size-xs);
    font-weight: 500;
    transition: color var(--transition-base);
}

.footer-link:hover {
    color: var(--color-accent);
}


/* ============================================================
   Contact: Privacy Note
   ============================================================ */
.form-privacy-note {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-sub-light);
    text-align: center;
    line-height: 1.6;
}

.form-privacy-note a {
    color: var(--color-accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.form-privacy-note a:hover {
    color: var(--color-accent-hover);
}


/* ============================================================
   Privacy Policy Page
   ============================================================ */
.body--dark {
    background-color: var(--color-bg-dark);
}

.privacy-main {
    padding-top: calc(var(--header-height) + var(--spacing-2xl));
    padding-bottom: var(--spacing-3xl);
    min-height: 100vh;
}

.privacy {
    max-width: 760px;
    margin: 0 auto;
}

.privacy-header {
    margin-bottom: var(--spacing-2xl);
    border-bottom: 1px solid var(--color-border-dark);
    padding-bottom: var(--spacing-lg);
}

.privacy-eyebrow {
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.privacy-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-text-light);
    line-height: 1.3;
    margin-bottom: var(--spacing-xs);
}

.privacy-date {
    font-size: var(--font-size-sm);
    color: var(--color-text-light-sub);
}

.privacy-body {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.privacy-intro {
    font-size: var(--font-size-base);
    color: var(--color-text-light-sub);
    line-height: 1.9;
    border-left: 3px solid var(--color-accent);
    padding-left: var(--spacing-md);
}

.privacy-section {
    /* セクション間はbody側のgapで制御 */
}

.privacy-section-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--color-border-dark);
}

.privacy-text {
    font-size: var(--font-size-base);
    color: var(--color-text-light-sub);
    line-height: 1.9;
    margin-bottom: var(--spacing-xs);
}

.privacy-text:last-child {
    margin-bottom: 0;
}

.privacy-text a {
    color: var(--color-accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.privacy-text a:hover {
    color: var(--color-accent-hover);
}

.privacy-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.privacy-list li {
    font-size: var(--font-size-base);
    color: var(--color-text-light-sub);
    padding-left: 1.2em;
    position: relative;
    line-height: 1.7;
}

.privacy-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.65em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--color-accent);
}

.privacy-dl {
    display: grid;
    grid-template-columns: 6em 1fr;
    gap: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-bg-dark-alt);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.privacy-dl dt {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-light-sub);
    align-self: center;
}

.privacy-dl dd {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.privacy-dl dd a {
    color: var(--color-accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.privacy-dl dd a:hover {
    color: var(--color-accent-hover);
}

.privacy-back {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border-dark);
    text-align: center;
}

@media (max-width: 640px) {
    .privacy-title {
        font-size: var(--font-size-2xl);
    }

    .privacy-dl {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }

    .privacy-dl dt {
        margin-top: var(--spacing-xs);
    }

    .privacy-dl dt:first-child {
        margin-top: 0;
    }
}


/* ============================================================
   Scroll Fade Animation
   ============================================================ */
.scroll-fade {
    opacity: 0;
    transform: translateY(24px);
    transition:
        opacity var(--transition-slow),
        transform var(--transition-slow);
}

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

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    html {
        scroll-behavior: auto;
    }

    .scroll-fade {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .hero-scroll-line,
    .hero-badge-dot {
        animation: none;
    }

    .btn:hover,
    .work-card:hover,
    .service-card:hover,
    .skill-card-primary:hover,
    .back-to-top:hover {
        transform: none;
    }
}