:root {
    --font-serif: 'Cormorant Garamond', serif;
    --font-sans: 'Noto Sans JP', 'Inter', sans-serif;
    --font-accent: 'Inter', sans-serif;
    --color-text: #2a2a2a;
    --color-text-light: #8a8a8a;
    --color-bg: #fafaf8;
    --color-bg-alt: #f0efeb;
    --color-border: #d4d0c8;
    --color-accent: #3d3d3d;
    --transition-base: 0.4s cubic-bezier(0.25, 0.1, 0.25, 1);
    --section-padding: clamp(80px, 10vw, 140px);
    --content-width: 1100px;
}

/* ===== Loader ===== */
#loader {
    position: fixed;
    inset: 0;
    background: var(--color-bg);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

#loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-inner {
    text-align: center;
}

.loader-text {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 300;
    letter-spacing: 0.3em;
    color: var(--color-text);
    margin-bottom: 2rem;
}

.loader-bar-track {
    width: 160px;
    height: 2px;
    background: var(--color-border);
    margin: 0 auto;
    overflow: hidden;
    position: relative;
}

.loader-bar-fill {
    height: 100%;
    width: 0%;
    background: var(--color-text);
    transition: width 0.05s linear;
}

/* ===== Reset & Base ===== */
html {
    scroll-behavior: auto;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.9;
    letter-spacing: 0.04em;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

a:hover {
    opacity: 0.6;
}

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

.pc-only {
    display: none;
}

::-webkit-scrollbar {
    display: none;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 5000;
    background: transparent;
    transition: background 0.4s ease, box-shadow 0.4s ease;
}

.header.scrolled {
    background: rgba(250, 250, 248, 0.92);
    backdrop-filter: blur(10px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}

.header-inner {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 clamp(20px, 4vw, 40px);
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-logo {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 400;
    letter-spacing: 0.25em;
    color: var(--color-text);
}

.header-nav {
    display: none;
    gap: 2.5rem;
}

.header-nav-link {
    font-family: var(--font-accent);
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.08em;
    color: var(--color-text);
    position: relative;
}

.header-nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-text);
    transition: width 0.3s ease;
}

.header-nav-link:hover {
    opacity: 1;
}

.header-nav-link:hover::after {
    width: 100%;
}

/* Hamburger */
.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    gap: 6px;
    padding: 0;
    z-index: 6000;
}

.hamburger-line {
    display: block;
    width: 22px;
    height: 1.5px;
    background: var(--color-text);
    transition: all 0.35s ease;
    transform-origin: center;
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* SP Menu */
.sp-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: min(320px, 85vw);
    height: 100vh;
    background: #fff;
    z-index: 5500;
    transform: translateX(100%);
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 3rem;
}

.sp-menu.active {
    transform: translateX(0);
}

.sp-menu-nav {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.sp-menu-link {
    font-family: var(--font-accent);
    font-size: 1.1rem;
    font-weight: 300;
    letter-spacing: 0.1em;
    padding: 1rem 0;
    border-bottom: 1px solid #eee;
    color: var(--color-text);
}

.sp-menu-link:first-child {
    border-top: 1px solid #eee;
}

.sp-menu-social {
    display: flex;
    gap: 1.5rem;
    margin-top: 2.5rem;
}

.sp-menu-social a {
    font-family: var(--font-accent);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    color: var(--color-text-light);
}

/* Menu overlay */
.menu-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.25);
    z-index: 5400;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ===== Main Content ===== */
.main-content {
    opacity: 0;
    transition: opacity 0.8s ease 0.2s;
}

.main-content.visible {
    opacity: 1;
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 0 clamp(20px, 4vw, 40px);
}

.hero-inner {
    text-align: center;
    width: 100%;
    max-width: var(--content-width);
}

.hero-text-block {
    margin-bottom: 3rem;
}

.hero-title {
    font-family: var(--font-sans);
    font-size: clamp(1.4rem, 4vw, 2.8rem);
    font-weight: 300;
    line-height: 2;
    letter-spacing: 0.12em;
    color: var(--color-text);
}

.hero-line {
    display: block;
    opacity: 0;
    transform: translateY(30px);
}

.hero-line.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.9s ease, transform 0.9s ease;
}

.hero-sub {
    font-family: var(--font-accent);
    font-size: 0.75rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    color: var(--color-text-light);
    margin-top: 1.5rem;
    opacity: 0;
}

.hero-sub.visible {
    opacity: 1;
    transition: opacity 1.2s ease 0.6s;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0;
}

.hero-scroll-indicator.visible {
    opacity: 1;
    transition: opacity 1s ease 1.2s;
}

.hero-scroll-text {
    font-family: var(--font-accent);
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    color: var(--color-text-light);
    writing-mode: vertical-lr;
}

.hero-scroll-line {
    width: 1px;
    height: 40px;
    background: var(--color-border);
    position: relative;
    overflow: hidden;
}

.hero-scroll-line::after {
    content: '';
    position: absolute;
    top: -100%;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-text);
    animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
    0% { top: -100%; }
    50% { top: 100%; }
    100% { top: 100%; }
}

/* ===== Sections (Common) ===== */
.section {
    padding: var(--section-padding) 0;
}

.section-inner {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 clamp(20px, 4vw, 40px);
}

.section-heading {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 300;
    letter-spacing: 0.15em;
    text-align: center;
    margin-bottom: clamp(3rem, 6vw, 5rem);
    color: var(--color-text);
}

/* Fade-in animation */
.fade-in-up {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ===== About ===== */
.about-content {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    align-items: center;
}

.about-image {
    width: 100%;
    max-width: 360px;
}

.about-image-wrapper {
    position: relative;
    overflow: hidden;
}

.about-image-placeholder {
    width: 100%;
    aspect-ratio: 4 / 5;
    background: var(--color-bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-image-placeholder span {
    font-family: var(--font-accent);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    color: var(--color-text-light);
}

.about-photo {
    width: 75%;
    aspect-ratio: 4 / 5;
    object-fit: cover;
    object-position: center top;
    display: block;
}

.about-text {
    max-width: 520px;
    text-align: center;
}

.about-name {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 400;
    letter-spacing: 0.2em;
    margin-bottom: 0.3rem;
}

.about-role {
    font-family: var(--font-accent);
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    color: var(--color-text-light);
    margin-bottom: 2rem;
}

.about-description {
    font-size: 0.85rem;
    line-height: 2.2;
    color: var(--color-text);
    margin-bottom: 1.2rem;
}

.about-description:last-child {
    margin-bottom: 0;
}

/* ===== Service ===== */
.service {
    background: var(--color-bg-alt);
}

.service-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
}

.service-card {
    padding: 2.5rem 2rem;
    background: #fff;
    position: relative;
}

.service-number {
    font-family: var(--font-serif);
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 0.1em;
    color: var(--color-text-light);
    display: block;
    margin-bottom: 1rem;
}

.service-title {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 400;
    letter-spacing: 0.08em;
    margin-bottom: 0.2rem;
}

.service-label {
    font-size: 0.7rem;
    color: var(--color-text-light);
    letter-spacing: 0.08em;
    margin-bottom: 1.5rem;
}

.service-desc {
    font-size: 0.82rem;
    line-height: 2;
    color: var(--color-text);
}

/* ===== Works ===== */
.works-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
}

.works-item {
    display: block;
    transition: transform var(--transition-base);
}

.works-item:hover {
    opacity: 1;
    transform: translateY(-4px);
}

.works-image {
    overflow: hidden;
    margin-bottom: 1rem;
}

.works-image-placeholder {
    width: 100%;
    aspect-ratio: 16 / 10;
    background: var(--color-bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.6s ease;
}

.works-item:hover .works-image-placeholder {
    transform: scale(1.03);
}

.works-image-placeholder span {
    font-family: var(--font-accent);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    color: var(--color-text-light);
}

/* Works プレビュー iframe */
.works-preview-wrap {
    width: 100%;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    position: relative;
    background: var(--color-bg-alt);
    pointer-events: none;
}

.works-preview-frame {
    position: absolute;
    top: 0;
    left: 0;
    width: 1280px;
    height: 800px;
    border: none;
    transform-origin: top left;
    transform: scale(0.25); /* JSが動く前のフォールバック */
}

.works-info {
    padding: 0 0.2rem;
}

.works-title {
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.3rem;
    letter-spacing: 0.03em;
}

.works-category {
    font-family: var(--font-accent);
    font-size: 0.7rem;
    color: var(--color-text-light);
    letter-spacing: 0.05em;
}

/* ===== Blog ===== */
.blog {
    background: var(--color-bg-alt);
}

.blog-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.blog-card {
    display: flex;
    gap: 1.2rem;
    align-items: flex-start;
    transition: transform var(--transition-base);
}

.blog-card:hover {
    opacity: 1;
    transform: translateX(4px);
}

.blog-image {
    flex-shrink: 0;
    width: 100px;
    overflow: hidden;
}

.blog-image-placeholder {
    width: 100%;
    aspect-ratio: 1;
    background: #ddd;
}

.blog-body {
    flex: 1;
    min-width: 0;
}

.blog-date {
    font-family: var(--font-accent);
    font-size: 0.68rem;
    color: var(--color-text-light);
    letter-spacing: 0.06em;
    display: block;
    margin-bottom: 0.4rem;
}

.blog-title {
    font-size: 0.82rem;
    font-weight: 500;
    line-height: 1.7;
    letter-spacing: 0.02em;
}

/* ===== Contact ===== */
.contact {
    text-align: center;
    padding-bottom: clamp(60px, 8vw, 100px);
    background: var(--color-bg-alt);
}

.contact-content {
    max-width: 500px;
    margin: 0 auto;
}

.contact-text {
    font-size: 0.88rem;
    line-height: 2.2;
    margin-bottom: 2.5rem;
    color: var(--color-text);
}

.contact-button {
    display: inline-block;
    font-family: var(--font-accent);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    padding: 1rem 3.5rem;
    border: 1px solid var(--color-text);
    color: var(--color-text);
    background: transparent;
    transition: background var(--transition-base), color var(--transition-base);
}

.contact-button:hover {
    background: var(--color-text);
    color: #fff;
    opacity: 1;
}

/* ===== Footer ===== */
.footer {
    border-top: 1px solid var(--color-border);
    padding: 3rem 0;
}

.footer-inner {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 clamp(20px, 4vw, 40px);
    text-align: center;
}

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

.footer-links a {
    font-family: var(--font-accent);
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    color: var(--color-text);
}

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

.footer-social a {
    font-family: var(--font-accent);
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    color: var(--color-text-light);
}

.footer-copy {
    font-family: var(--font-accent);
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    color: var(--color-text-light);
}

/* ===== PC (min-width: 768px) ===== */
@media (min-width: 768px) {
    .pc-only {
        display: inline;
    }

    .header-nav {
        display: flex;
    }

    .hamburger {
        display: none;
    }

    .header-inner {
        height: 80px;
    }

    /* About */
    .about-content {
        flex-direction: row;
        gap: clamp(3rem, 6vw, 6rem);
        align-items: flex-start;
    }

    .about-image {
        flex-shrink: 0;
        width: 300px;
    }

    .about-text {
        text-align: left;
    }

    /* Service */
    .service-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }

    .service-card {
        padding: 2.5rem 2rem;
    }

    /* Works */
    .works-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 3rem 2rem;
    }

    /* Blog */
    .blog-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }

    .blog-card {
        flex-direction: column;
        gap: 0;
    }

    .blog-image {
        width: 100%;
        margin-bottom: 1rem;
    }

    .blog-image-placeholder {
        aspect-ratio: 3 / 2;
    }
}

/* ===== Large screens ===== */
@media (min-width: 1200px) {
    .about-image {
        width: 380px;
    }

    .service-card {
        padding: 3rem 2.5rem;
    }

    .works-grid {
        gap: 3.5rem 2.5rem;
    }
}

/* ===== Works Modal ===== */
.works-modal {
    position: fixed;
    inset: 0;
    z-index: 8000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s ease, visibility 0.35s ease;
}

.works-modal.open {
    opacity: 1;
    visibility: visible;
}

.works-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
}

.works-modal-inner {
    position: relative;
    width: 90vw;
    height: 85vh;
    background: #fff;
    z-index: 1;
    transform: scale(0.96);
    transition: transform 0.35s ease;
}

.works-modal.open .works-modal-inner {
    transform: scale(1);
}

.works-modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 1.6rem;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 2;
    line-height: 1;
    color: var(--color-text);
    transition: opacity 0.2s ease;
}

.works-modal-close:hover {
    opacity: 0.5;
}

.works-modal-frame {
    width: 100%;
    height: 100%;
    border: none;
}