/* =========================================================================
   # Design Tokens
   ========================================================================= */

:root {
    --color-bg: #f8f8f8;
    --color-text: #1a1a1a;
    --color-accent: #000000;
    --color-white: #ffffff;
    --color-overlay: rgba(0, 0, 0, 0.4);
    --color-overlay-dark: rgba(0, 0, 0, 0.6);

    --font-jp: 'Noto Sans JP', sans-serif;
    --font-en: 'Josefin Sans', sans-serif;

    --transition-smooth: all 1.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: all 0.3s ease;
}

/* =========================================================================
   # Reset & Base
   ========================================================================= */

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-jp);
    line-height: 2;
    letter-spacing: 0.08em;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

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

.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 5%;
}

.container.narrow {
    max-width: 800px;
}

.section {
    padding: 180px 0;
}

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

/* =========================================================================
   # Typography
   ========================================================================= */

.vertical {
    writing-mode: vertical-rl;
    text-orientation: mixed;
}

.section-label {
    font-family: var(--font-en);
    font-weight: 300;
    font-size: 0.85rem;
    letter-spacing: 0.5em;
    margin-bottom: 2.5rem;
    text-transform: uppercase;
    opacity: 0.5;
}

.section-heading {
    font-size: 2.8rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    margin-bottom: 2rem;
    line-height: 1.4;
}

/* =========================================================================
   # Header
   ========================================================================= */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 40px 0;
    transition: padding 0.5s ease, background 0.5s ease;
}

.header.scrolled {
    padding: 20px 0;
    background: rgba(248, 248, 248, 0.9);
    backdrop-filter: blur(10px);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5%;
}

.logo {
    display: flex;
    flex-direction: column;
}

.logo-en {
    font-family: var(--font-en);
    font-weight: 300;
    font-size: 1.4rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.logo-jp {
    font-size: 0.75rem;
    letter-spacing: 0.35em;
    margin-top: -6px;
}

.nav {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-link {
    font-family: var(--font-en);
    font-weight: 300;
    font-size: 0.85rem;
    letter-spacing: 0.2em;
}

.nav-link:hover {
    opacity: 0.5;
}

.nav-contact {
    font-family: var(--font-en);
    font-weight: 400;
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    border: 1px solid var(--color-text);
    padding: 10px 25px;
    transition: var(--transition-fast);
}

.nav-contact:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
}

/* =========================================================================
   # Hero
   ========================================================================= */

.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    overflow: hidden;
}

.hero-video-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Ken Burns Effect */
.ken-burns {
    animation: kenBurns 40s linear infinite alternate;
}

@keyframes kenBurns {
    from { transform: scale(1); }
    to { transform: scale(1.15); }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-overlay);
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 80px;
    z-index: 10;
}

.hero-copy-wrapper {
    display: flex;
    gap: 50px;
}

.hero-title {
    font-size: 4rem;
    font-weight: 500;
    line-height: 1.4;
}

.hero-subtitle {
    font-size: 1.4rem;
    font-weight: 400;
    line-height: 1.8;
    margin-top: 30px;
}

.btn-primary {
    display: inline-block;
    padding: 18px 50px;
    background-color: var(--color-white);
    color: var(--color-text);
    font-weight: 500;
    letter-spacing: 0.2em;
    transition: var(--transition-fast);
}

.btn-primary:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
}

/* =========================================================================
   # About
   ========================================================================= */

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 100px;
    align-items: center;
}

.about-image {
    width: 100%;
    height: auto;
    box-shadow: 20px 20px 0 rgba(0,0,0,0.03);
}

/* =========================================================================
   # Service
   ========================================================================= */

.service {
    background-color: #fff;
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 60px;
    margin-top: 80px;
}

.service-item {
    padding: 40px;
    border-left: 1px solid rgba(0,0,0,0.05);
}

.service-num {
    font-family: var(--font-en);
    font-size: 3rem;
    font-weight: 200;
    opacity: 0.1;
    display: block;
    margin-bottom: 20px;
}

.service-title {
    font-family: var(--font-en);
    font-size: 1.6rem;
    font-weight: 300;
    margin-bottom: 20px;
    letter-spacing: 0.1em;
}

.service-desc {
    font-size: 0.95rem;
    color: #666;
}

/* =========================================================================
   # Works (Fullscreen Section)
   ========================================================================= */

.fullscreen-section {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.work-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.work-parallax-img {
    width: 100%;
    height: 120%;
    object-fit: cover;
    transform: translateY(0);
    transition: transform 0.1s linear;
}

.work-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, rgba(0,0,0,0.6) 0%, rgba(0,0,0,0.2) 50%, rgba(0,0,0,0) 100%);
}

.work-content {
    color: var(--color-white);
    z-index: 10;
}

.work-text-block {
    max-width: 600px;
}

.work-en {
    font-family: var(--font-en);
    font-weight: 300;
    letter-spacing: 0.4em;
    margin-bottom: 20px;
    opacity: 0.7;
}

.work-name {
    font-family: var(--font-en);
    font-size: 4rem;
    font-weight: 200;
    margin-bottom: 30px;
    letter-spacing: 0.1em;
}

.work-desc {
    font-size: 1.1rem;
    line-height: 2;
    font-weight: 300;
}

/* =========================================================================
   # Contact Form
   ========================================================================= */

.contact-form {
    margin-top: 60px;
    text-align: left;
}

.form-group {
    margin-bottom: 30px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 0;
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(0,0,0,0.1);
    font-family: var(--font-jp);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    border-bottom-color: var(--color-accent);
}

.form-button-wrapper {
    margin-top: 50px;
    text-align: center;
}

.btn-large {
    display: inline-block;
    padding: 22px 100px;
    background-color: var(--color-accent);
    color: var(--color-white);
    font-family: var(--font-en);
    font-weight: 400;
    letter-spacing: 0.4em;
    border: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-large:hover {
    background-color: #333;
    transform: translateY(-3px);
}

/* =========================================================================
   # Footer
   ========================================================================= */

.footer {
    padding: 80px 0;
    background-color: var(--color-bg);
}

/* =========================================================================
   # Reveal Animations
   ========================================================================= */

.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: var(--transition-smooth);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================================================
   # Responsive
   ========================================================================= */

@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .service-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 120px 0;
    }

    .hero-title {
        font-size: 3rem;
    }

    .work-name {
        font-size: 2.8rem;
    }

    .nav {
        display: none;
    }

    .section-heading {
        font-size: 2rem;
    }

    .btn-large {
        padding: 20px 50px;
        width: 100%;
    }
}