/* ===== CSS Reset & Variables ===== */
:root {
    /* Colors */
    --color-primary: #000000;
    --color-secondary: #ffffff;
    --color-accent: #333333;
    --color-text: #1a1a1a;
    --color-text-light: #666666;
    --color-background: #ffffff;
    --color-background-alt: #f8f8f8;
    --color-border: #e0e0e0;
    
    /* Typography */
    --font-primary: 'Noto Sans JP', sans-serif;
    --font-secondary: 'Inter', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Transitions */
    --transition: all 0.3s ease;
    
    /* Z-index */
    --z-fixed: 100;
    --z-modal: 200;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-background);
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
}

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

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

/* ===== Utility Classes ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.br-pc {
    display: inline;
}

@media screen and (max-width: 768px) {
    .br-pc {
        display: none;
    }
}

/* ===== Header & Navigation ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    z-index: var(--z-fixed);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.nav__logo {
    display: flex;
    align-items: center;
}

.logo-image {
    height: 40px;
    width: auto;
    display: block;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo-text {
    color: var(--color-primary);
}

.nav__menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav__link {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--color-text);
    position: relative;
    padding: 0.5rem 0;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width 0.3s ease;
}

.nav__link:hover::after {
    width: 100%;
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.nav__toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    padding: 180px 0 120px;
    background: linear-gradient(135deg, #f8f8f8 0%, #ffffff 100%);
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.hero__content {
    animation: fadeInUp 0.8s ease;
}

.hero__title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.highlight {
    position: relative;
    display: inline-block;
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: 10px;
    left: 0;
    width: 100%;
    height: 20px;
    background-color: rgba(0, 0, 0, 0.1);
    z-index: -1;
}

.hero__description {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.hero__buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero__image {
    position: relative;
    height: 500px;
}

.hero__decoration {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 50%, #d4d4d4 100%);
    border-radius: 20px;
    position: relative;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.hero__decoration::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(0, 0, 0, 0.03) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

.hero__decoration::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -30%;
    width: 80%;
    height: 80%;
    background: radial-gradient(circle, rgba(0, 0, 0, 0.02) 0%, transparent 60%);
    animation: float 15s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    50% {
        transform: translate(-20px, -20px) scale(1.1);
    }
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-secondary);
}

.btn-primary:hover {
    background-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

.btn-block {
    width: 100%;
}

/* ===== Section Styles ===== */
.section__header {
    margin-bottom: var(--spacing-lg);
}

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

.section__title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.section__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    font-weight: 400;
}

/* ===== Services Section ===== */
.services {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-background);
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.service__card {
    background-color: var(--color-secondary);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: var(--spacing-md);
    transition: var(--transition);
}

.service__card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.service__icon {
    width: 60px;
    height: 60px;
    background-color: var(--color-background-alt);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.service__icon svg {
    width: 32px;
    height: 32px;
}

.service__title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.service__description {
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ===== About Section ===== */
.about {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-background-alt);
}

.about__wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.about__text {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-light);
    line-height: 1.8;
}

.about__info {
    margin-top: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.info__item {
    padding: var(--spacing-sm);
    background-color: var(--color-secondary);
    border-radius: 8px;
}

.info__label {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.info__value {
    font-size: 1rem;
    color: var(--color-text);
    font-weight: 500;
}

.about__visual {
    position: relative;
    height: 500px;
}

.about__decoration {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.02) 0%, rgba(0, 0, 0, 0.05) 100%);
    border-radius: 20px;
    position: relative;
}

.about__decoration::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-radius: 20px;
}

/* ===== Founder Section ===== */
.founder {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-background);
}

.founder__wrapper {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.founder__profile {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.founder__image-container {
    margin-bottom: var(--spacing-md);
}

.founder__image {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 20px;
    border: 1px solid var(--color-border);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.founder__image-placeholder {
    width: 100%;
    aspect-ratio: 1;
    background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
    border: 1px solid var(--color-border);
}

.founder__image-placeholder svg {
    width: 120px;
    height: 120px;
}

.founder__name-card {
    background-color: var(--color-secondary);
    padding: var(--spacing-md);
    border-radius: 16px;
    border: 1px solid var(--color-border);
    text-align: center;
}

.founder__name {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.founder__name-en {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-secondary);
}

.founder__title {
    font-size: 0.95rem;
    color: var(--color-text);
    font-weight: 500;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}

.founder__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.founder__intro {
    background-color: var(--color-background-alt);
    padding: var(--spacing-md);
    border-radius: 16px;
    border-left: 4px solid var(--color-primary);
}

.founder__subtitle {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.founder__description {
    color: var(--color-text);
    line-height: 1.8;
}

.founder__experience {
    background-color: var(--color-secondary);
    padding: var(--spacing-md);
    border-radius: 16px;
    border: 1px solid var(--color-border);
}

.experience__timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.experience__item {
    padding: var(--spacing-sm);
    background-color: var(--color-background-alt);
    border-radius: 12px;
    position: relative;
    padding-left: var(--spacing-sm);
    padding-top: calc(var(--spacing-sm) + 35px);
    transition: var(--transition);
}

.experience__item:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

.experience__item--current {
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.03) 0%, rgba(0, 0, 0, 0.01) 100%);
    border: 2px solid var(--color-primary);
}

/* Featured/Main Card (Brilligent) */
.experience__item--featured {
    padding: var(--spacing-md);
    padding-top: calc(var(--spacing-md) + 40px);
    margin-bottom: var(--spacing-md);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.experience__item--featured .experience__company {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.experience__item--featured .experience__role {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}

.experience__item--featured .experience__description {
    font-size: 1rem;
}

/* Grid for smaller cards */
.experience__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

/* Small card style */
.experience__item--small {
    padding: var(--spacing-sm);
    padding-top: calc(var(--spacing-sm) + 30px);
}

.experience__item--small:hover {
    transform: translateY(-5px);
}

.experience__item--small .experience__company {
    font-size: 0.95rem;
}

.experience__item--small .experience__role {
    font-size: 0.85rem;
}

.experience__item--small .experience__description {
    font-size: 0.85rem;
}

.experience__item--small .experience__badge {
    font-size: 0.65rem;
    padding: 0.25rem 0.65rem;
}

.experience__badge {
    position: absolute;
    left: var(--spacing-sm);
    top: var(--spacing-sm);
    background-color: var(--color-accent);
    color: var(--color-secondary);
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.experience__badge--current {
    background-color: var(--color-primary);
}

.experience__company {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--color-text);
}

.experience__role {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.experience__description {
    font-size: 0.9rem;
    color: var(--color-text);
    line-height: 1.7;
}

.founder__expertise {
    background-color: var(--color-secondary);
    padding: var(--spacing-md);
    border-radius: 16px;
    border: 1px solid var(--color-border);
}

.expertise__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: var(--spacing-md);
}

.expertise__tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--color-background-alt);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    transition: var(--transition);
}

.expertise__tag:hover {
    background-color: var(--color-primary);
    color: var(--color-secondary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

/* ===== Contact Section ===== */
.contact {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-background);
}

.contact__container {
    max-width: 700px;
    margin: 0 auto;
}

.contact__form {
    background-color: var(--color-secondary);
    padding: var(--spacing-md);
    border-radius: 16px;
    border: 1px solid var(--color-border);
}

.form__group {
    margin-bottom: var(--spacing-sm);
}

.form__label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--color-text);
}

.required {
    color: #e74c3c;
}

.form__input,
.form__textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: var(--font-primary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: var(--transition);
    background-color: var(--color-background-alt);
}

.form__input:focus,
.form__textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    background-color: var(--color-secondary);
}

.form__textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== Footer ===== */
.footer {
    background-color: var(--color-primary);
    color: var(--color-secondary);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer__content {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.footer__logo {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.logo-image--footer {
    height: 50px;
    width: auto;
    filter: brightness(0) invert(1);
}

.footer__logo .logo-icon {
    color: var(--color-secondary);
}

.footer__logo .logo-text {
    color: var(--color-secondary);
}

.footer__text {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-md);
}

.footer__nav {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.footer__link {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
    transition: var(--transition);
}

.footer__link:hover {
    color: var(--color-secondary);
}

.footer__bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__copyright {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
}

/* ===== Page Header ===== */
.page-header {
    padding: 140px 0 var(--spacing-lg);
    background: linear-gradient(135deg, #f8f8f8 0%, #ffffff 100%);
    text-align: center;
}

.page-header__title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.page-header__subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    font-weight: 400;
}

/* ===== About Page Specific Styles ===== */
.about--page {
    padding-top: 0;
}

.about__intro {
    margin-bottom: var(--spacing-lg);
}

.about__intro-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.about__vision-card {
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.02) 0%, rgba(0, 0, 0, 0.01) 100%);
    padding: var(--spacing-md);
    border-radius: 16px;
    border-left: 4px solid var(--color-primary);
    text-align: center;
}

.vision__title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    font-family: var(--font-secondary);
}

.vision__subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.vision__description {
    color: var(--color-text);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.vision__description:last-child {
    margin-bottom: 0;
}

.info__item--full {
    grid-column: 1 / -1;
}

.business-fields {
    margin-top: var(--spacing-xl);
    text-align: center;
}

.business-fields__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.business-field__card {
    background-color: var(--color-secondary);
    padding: var(--spacing-md);
    border-radius: 16px;
    border: 1px solid var(--color-border);
    text-align: left;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.business-field__card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.business-field__number {
    position: absolute;
    top: -10px;
    right: var(--spacing-sm);
    font-size: 4rem;
    font-weight: 700;
    color: rgba(0, 0, 0, 0.03);
    font-family: var(--font-secondary);
}

.business-field__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.business-field__description {
    color: var(--color-text-light);
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

/* ===== Founder Page Specific Styles ===== */
.founder__philosophy {
    background-color: var(--color-secondary);
    padding: var(--spacing-md);
    border-radius: 16px;
    border: 1px solid var(--color-border);
}

.philosophy__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.philosophy__text {
    color: var(--color-text);
    line-height: 1.8;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Responsive Design ===== */
@media screen and (max-width: 968px) {
    .hero__title {
        font-size: 2.5rem;
    }
    
    .section__title {
        font-size: 2rem;
    }
    
    .hero__container,
    .about__wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .hero__image,
    .about__visual {
        height: 300px;
    }
    
    .founder__wrapper {
        grid-template-columns: 1fr;
    }
    
    .founder__profile {
        position: static;
    }
}

@media screen and (max-width: 768px) {
    .nav__menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        background-color: var(--color-background);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        transition: left 0.3s ease;
        gap: 0;
    }
    
    .nav__menu.active {
        left: 0;
    }
    
    .nav__item {
        width: 100%;
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav__link {
        display: block;
        padding: var(--spacing-sm) 0;
    }
    
    .nav__toggle {
        display: flex;
    }
    
    .nav__toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(7px, 7px);
    }
    
    .nav__toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav__toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero__title {
        font-size: 2rem;
    }
    
    .hero__description {
        font-size: 1rem;
    }
    
    .hero__buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .services__grid {
        grid-template-columns: 1fr;
    }
    
    .section__title {
        font-size: 1.75rem;
    }
    
    .experience__item {
        padding-left: var(--spacing-sm);
        padding-top: calc(var(--spacing-sm) + 30px);
    }
    
    .experience__badge {
        left: var(--spacing-sm);
        top: var(--spacing-sm);
    }
    
    .experience__grid {
        grid-template-columns: 1fr;
    }
    
    .experience__item--featured {
        padding: var(--spacing-sm);
        padding-top: calc(var(--spacing-sm) + 35px);
    }
    
    .experience__item--featured .experience__company {
        font-size: 1.25rem;
    }
    
    .experience__item--featured .experience__role {
        font-size: 1rem;
    }
    
    .experience__item--featured .experience__description {
        font-size: 0.95rem;
    }
}

@media screen and (max-width: 480px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero__title {
        font-size: 1.75rem;
    }
    
    .logo-image {
        height: 32px;
    }
    
    .nav__logo {
        font-size: 1.25rem;
    }
    
    .logo-icon {
        width: 28px;
        height: 28px;
    }
}