/* Modern Portfolio Styles */

:root {
    color-scheme: light dark;

    --bg: #f6f7fb;
    --bg-accent-1: rgba(99, 102, 241, 0.10);
    --bg-accent-2: rgba(236, 72, 153, 0.08);
    --surface: rgba(255, 255, 255, 0.78);
    --surface-solid: #ffffff;
    --text: #0f172a;
    --muted: #475569;
    --muted-2: #64748b;
    --border: rgba(15, 23, 42, 0.12);
    --shadow: 0 18px 45px rgba(15, 23, 42, 0.10);
    --shadow-hover: 0 22px 70px rgba(15, 23, 42, 0.16);

    --accent: #6366f1;
    --accent-2: #a855f7;
    --radius: 18px;
    --radius-lg: 24px;
    --container: 1120px;
    --header-height: 72px;

    --focus-ring: 0 0 0 4px rgba(99, 102, 241, 0.18);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b1020;
        --bg-accent-1: rgba(99, 102, 241, 0.14);
        --bg-accent-2: rgba(236, 72, 153, 0.10);
        --surface: rgba(15, 23, 42, 0.72);
        --surface-solid: #0f172a;
        --text: #e2e8f0;
        --muted: #a8b4c4;
        --muted-2: #94a3b8;
        --border: rgba(226, 232, 240, 0.14);
        --shadow: 0 18px 55px rgba(0, 0, 0, 0.35);
        --shadow-hover: 0 24px 90px rgba(0, 0, 0, 0.45);
        --focus-ring: 0 0 0 4px rgba(99, 102, 241, 0.25);
    }
}

:root[data-theme="light"] {
    --bg: #f6f7fb;
    --bg-accent-1: rgba(99, 102, 241, 0.10);
    --bg-accent-2: rgba(236, 72, 153, 0.08);
    --surface: rgba(255, 255, 255, 0.78);
    --surface-solid: #ffffff;
    --text: #0f172a;
    --muted: #475569;
    --muted-2: #64748b;
    --border: rgba(15, 23, 42, 0.12);
    --shadow: 0 18px 45px rgba(15, 23, 42, 0.10);
    --shadow-hover: 0 22px 70px rgba(15, 23, 42, 0.16);
    --focus-ring: 0 0 0 4px rgba(99, 102, 241, 0.18);
}

:root[data-theme="dark"] {
    --bg: #0b1020;
    --bg-accent-1: rgba(99, 102, 241, 0.14);
    --bg-accent-2: rgba(236, 72, 153, 0.10);
    --surface: rgba(15, 23, 42, 0.72);
    --surface-solid: #0f172a;
    --text: #e2e8f0;
    --muted: #a8b4c4;
    --muted-2: #94a3b8;
    --border: rgba(226, 232, 240, 0.14);
    --shadow: 0 18px 55px rgba(0, 0, 0, 0.35);
    --shadow-hover: 0 24px 90px rgba(0, 0, 0, 0.45);
    --focus-ring: 0 0 0 4px rgba(99, 102, 241, 0.25);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    * {
        transition: none !important;
    }
}

body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, Arial, sans-serif;
    line-height: 1.65;
    color: var(--text);
    background:
        radial-gradient(1200px 700px at 10% -20%, var(--bg-accent-1), transparent 60%),
        radial-gradient(900px 650px at 110% 10%, var(--bg-accent-2), transparent 55%),
        var(--bg);
    min-height: 100vh;
}

a {
    color: inherit;
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.site-header,
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.45);
    background: color-mix(in srgb, var(--surface) 75%, transparent);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
}

.top-nav,
nav {
    min-height: var(--header-height);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 0.2px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.logo::before {
    content: "";
    width: 14px;
    height: 14px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 60%, rgba(236, 72, 153, 0.95) 120%);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.16);
}

.icon {
    width: 1.1em;
    height: 1.1em;
    display: inline-block;
    vertical-align: -0.15em;
    flex: 0 0 auto;
}

.title-with-icon {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.page-icon {
    width: 52px;
    height: 52px;
    margin: 0 auto 0.65rem;
    display: grid;
    place-items: center;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: color-mix(in srgb, var(--surface) 92%, transparent);
    box-shadow: var(--shadow);
    color: var(--accent);
}

.page-icon .icon {
    width: 26px;
    height: 26px;
}

.nav-links {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 22px;
    margin: 0;
    padding: 0;
}

.nav-links a {
    text-decoration: none;
    color: var(--muted);
    font-weight: 650;
    font-size: 0.95rem;
    padding: 10px 10px;
    border-radius: 12px;
    transition: background-color 180ms ease, color 180ms ease;
}

.nav-links a:hover {
    background: rgba(99, 102, 241, 0.08);
    color: var(--text);
}

.nav-right {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.icon-btn {
    appearance: none;
    border: 1px solid var(--border);
    background: var(--surface);
    background: color-mix(in srgb, var(--surface) 88%, transparent);
    color: var(--text);
    border-radius: 14px;
    padding: 10px 12px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.icon-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.icon-btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

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

.nav-toggle {
    display: none;
}

/* Hero */
.hero {
    padding: 6.5rem 0 5.25rem;
}

.hero-content {
    background: linear-gradient(
        135deg,
        rgba(99, 102, 241, 0.16) 0%,
        rgba(168, 85, 247, 0.14) 50%,
        rgba(236, 72, 153, 0.10) 100%
    );
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 3.2rem 0;
}

.hero h1 {
    font-size: clamp(2.2rem, 4vw, 3.25rem);
    line-height: 1.12;
    margin: 0 0 1rem;
    letter-spacing: -0.02em;
}

.hero p {
    margin: 0.25rem 0 0;
    font-size: 1.1rem;
    color: var(--muted);
}

.hero .subtitle {
    margin-top: 1rem;
    font-size: 1.05rem;
    color: var(--muted);
}

.hero .container {
    text-align: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.95rem 1.35rem;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 750;
    letter-spacing: 0.2px;
    border: 1px solid var(--border);
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 55%, rgba(236, 72, 153, 0.90) 130%);
    color: white;
    box-shadow: var(--shadow);
    transition: transform 160ms ease, box-shadow 160ms ease, filter 160ms ease;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-hover);
    filter: saturate(1.05);
}

.btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
    margin-left: 0.75rem;
    box-shadow: none;
}

.btn-secondary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.hero .btn {
    margin-top: 1.8rem;
}

.cta-box .btn {
    margin-top: 1.1rem;
}

/* Sections */
section {
    padding: 4.25rem 0;
}

section[id] {
    scroll-margin-top: calc(var(--header-height) + 16px);
}

.section-tight {
    padding: 2.25rem 0 1.5rem;
}

.section-topless {
    padding-top: 0;
}

.section-title {
    text-align: center;
    font-size: clamp(1.9rem, 3vw, 2.35rem);
    margin: 0 0 0.75rem;
    font-weight: 820;
    letter-spacing: -0.02em;
}

.section-subtitle {
    text-align: center;
    color: var(--muted);
    margin: 0 0 2.5rem;
    font-size: 1.02rem;
}

/* Cards / Grids */
.grid-2,
.grid-3,
.grid-4 {
    display: grid;
    gap: 18px;
}

.grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card,
.project-card,
.skill-card,
.content,
.contact-form {
    background: var(--surface);
    background: color-mix(in srgb, var(--surface) 92%, transparent);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.project-card,
.skill-card {
    text-decoration: none;
    color: inherit;
    display: block;
    overflow: hidden;
    transition: transform 160ms ease, box-shadow 160ms ease;
}

.project-card:hover,
.skill-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.skill-card {
    padding: 1.4rem;
}

.skill-card h3 {
    margin: 0 0 0.8rem;
    font-size: 1.15rem;
    letter-spacing: -0.01em;
}

.skill-card ul {
    margin: 0.75rem 0 0;
    padding: 0;
    list-style: none;
}

.skill-card li {
    color: var(--muted);
    padding: 0.35rem 0;
    padding-left: 1.25rem;
    position: relative;
}

.skill-card li::before {
    content: "•";
    position: absolute;
    left: 0;
    top: 0.35rem;
    color: var(--accent);
}

.card-link {
    display: inline-flex;
    margin-top: 0.9rem;
    font-weight: 700;
    color: var(--accent);
}

.project-image {
    width: 100%;
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    background: var(--badge-bg, linear-gradient(135deg, rgba(99, 102, 241, 0.28) 0%, rgba(168, 85, 247, 0.24) 65%, rgba(236, 72, 153, 0.20) 120%));
    border-bottom: 1px solid var(--border);
    color: rgba(255, 255, 255, 0.95);
}

.project-image .icon {
    width: 44px;
    height: 44px;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.18));
}

.project-content {
    padding: 1.4rem;
}

.project-content h3 {
    margin: 0 0 0.55rem;
    font-size: 1.18rem;
    letter-spacing: -0.01em;
}

.project-content p {
    margin: 0.5rem 0 0;
    color: var(--muted);
}

.project-content strong {
    color: var(--text);
}

/* Content blocks */
.content {
    max-width: 920px;
    margin: 0 auto;
    padding: 2.2rem;
}

.content p {
    font-size: 1.06rem;
    color: var(--muted);
    margin: 0 0 1.1rem;
}

.content h1 {
    margin: 0;
}

.content h2 {
    margin: 2rem 0 0.75rem;
    font-size: 1.6rem;
    letter-spacing: -0.02em;
}

.content h3 {
    margin: 1.35rem 0 0.55rem;
    font-size: 1.2rem;
    color: var(--text);
}

.content ul,
.content ol {
    margin: 0.6rem 0 1.15rem;
    padding-left: 1.25rem;
}

.content li {
    margin: 0.35rem 0;
    color: var(--muted);
}

.page-intro {
    text-align: center;
    margin-bottom: 2rem;
}

.page-icon {
    font-size: 3.2rem;
    margin-bottom: 0.5rem;
}

.project-logo {
    display: block;
    width: 280px;
    max-width: 80%;
    height: auto;
    margin: 0 auto 1.25rem;
}

/* ダークモードでは黒文字ロゴを白反転 */
@media (prefers-color-scheme: dark) {
    .project-logo.logo-invert {
        filter: invert(1) hue-rotate(180deg);
    }
}
:root[data-theme="dark"] .project-logo.logo-invert {
    filter: invert(1) hue-rotate(180deg);
}

.page-title {
    font-size: clamp(1.9rem, 3vw, 2.35rem);
    margin: 0 0 0.35rem;
    letter-spacing: -0.02em;
}

.page-lead {
    margin: 0;
    color: var(--muted);
    font-weight: 650;
}

.page-tags {
    justify-content: center;
    margin-top: 1.1rem;
}

.cta-box {
    text-align: center;
    margin-top: 2.2rem;
    padding: 1.6rem;
    border-radius: var(--radius);
    background: linear-gradient(
        135deg,
        rgba(99, 102, 241, 0.12) 0%,
        rgba(168, 85, 247, 0.10) 55%,
        rgba(236, 72, 153, 0.08) 100%
    );
    border: 1px solid var(--border);
}

/* Form */
.contact-form {
    max-width: 760px;
    margin: 0 auto;
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.6rem;
    color: var(--text);
    font-weight: 700;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.9rem 1rem;
    border: 1px solid var(--border);
    border-radius: 14px;
    font-size: 1rem;
    background: var(--surface-solid);
    background: color-mix(in srgb, var(--surface-solid) 80%, transparent);
    color: var(--text);
    transition: box-shadow 160ms ease, border-color 160ms ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: rgba(99, 102, 241, 0.55);
    box-shadow: var(--focus-ring);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.submit-btn {
    width: 100%;
    padding: 1rem 1.2rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 1rem;
    font-weight: 780;
    cursor: pointer;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 55%, rgba(236, 72, 153, 0.90) 130%);
    color: white;
    box-shadow: var(--shadow);
    transition: transform 160ms ease, box-shadow 160ms ease, filter 160ms ease;
}

.submit-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-hover);
    filter: saturate(1.05);
}

.submit-btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* Breadcrumb */
.breadcrumb {
    font-size: 0.92rem;
    color: var(--muted-2);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb a {
    color: var(--muted);
    text-decoration: none;
    border-bottom: 1px dashed transparent;
}

.breadcrumb a:hover {
    color: var(--text);
    border-bottom-color: var(--border);
}

.breadcrumb span {
    color: var(--muted-2);
}

/* Tags */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.8rem;
}

.tag {
    background: var(--surface-solid);
    background: color-mix(in srgb, var(--surface-solid) 80%, transparent);
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 0.35rem 0.65rem;
    border-radius: 999px;
    font-size: 0.86rem;
    font-weight: 650;
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 2.5rem 0;
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
    margin-bottom: 1.1rem;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    text-decoration: none;
    color: var(--muted);
    padding: 0.65rem 0.9rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--surface);
    background: color-mix(in srgb, var(--surface) 88%, transparent);
    transition: transform 160ms ease, box-shadow 160ms ease, color 160ms ease;
}

.social-link:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
    color: var(--text);
}

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

.footer-note {
    text-align: center;
    color: var(--muted-2);
    margin: 0;
}

/* A11y */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Responsive */
@media (max-width: 980px) {
    .grid-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .grid-3 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-content {
        padding: 2.5rem 0;
    }

    .btn {
        width: 100%;
    }

    .btn-secondary {
        margin-left: 0;
        margin-top: 0.75rem;
    }

    .nav-toggle {
        display: inline-flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: calc(100% + 8px);
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 6px;
        padding: 12px;
        border-radius: 16px;
        background: color-mix(in srgb, var(--surface) 92%, transparent);
        border: 1px solid var(--border);
        box-shadow: var(--shadow);
    }

    body.nav-open .nav-links {
        display: flex;
    }

    .nav-links a {
        padding: 12px 12px;
    }

    .grid-4 {
        grid-template-columns: 1fr;
    }
}