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

:root {
    --color-black: #000000;
    --color-white: #ffffff;
    --color-gray: #333333;
    --color-gray-light: #666666;
    --color-gray-lighter: #999999;
    --font-primary: 'Montserrat', sans-serif;
    --font-secondary: 'Noto Sans JP', sans-serif;
    --transition-speed: 0.3s;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-secondary);
    background-color: var(--color-black);
    color: var(--color-white);
    line-height: 1.8;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===========================
   Navigation
   =========================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all var(--transition-speed) ease;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(255, 255, 255, 0.1);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.nav-logo a {
    display: flex;
    align-items: center;
    gap: 15px;
    text-decoration: none;
}

.nav-logo img {
    height: 40px;
    transition: all var(--transition-speed) ease;
}

.nav-logo-text {
    font-family: var(--font-primary);
    font-size: 24px;
    font-weight: 800;
    letter-spacing: 3px;
    color: var(--color-white);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-link {
    color: var(--color-white);
    text-decoration: none;
    font-family: var(--font-primary);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 1px;
    position: relative;
    transition: all var(--transition-speed) ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-white);
    transition: width var(--transition-speed) ease;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-white);
    transition: all var(--transition-speed) ease;
}

.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);
}

/* ===========================
   Page Header
   =========================== */
.page-header {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.page-header-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.page-header-content {
    position: relative;
    z-index: 2;
    text-align: center;
}

.page-title {
    font-family: var(--font-primary);
    font-size: clamp(48px, 10vw, 100px);
    font-weight: 800;
    letter-spacing: 10px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #ffffff 0%, #999999 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease-out;
}

.page-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    font-weight: 300;
    color: var(--color-gray-lighter);
    animation: fadeInUp 1s ease-out 0.2s both;
}

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

/* ===========================
   Page Main Content (with fixed background)
   =========================== */
.philosophy-main,
.business-main,
.recruit-main,
.faq-main,
.contact-main,
.about-main {
    position: relative;
    z-index: 1;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background: rgba(255, 255, 255, 0.02);
    padding: 60px 0 30px;
    margin-top: 100px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-logo img {
    height: 35px;
    width: auto;
    object-fit: contain;
}

.footer-logo p {
    font-family: var(--font-primary);
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--color-gray-lighter);
}

.footer-nav {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.footer-nav a {
    color: var(--color-gray-lighter);
    text-decoration: none;
    font-family: var(--font-primary);
    font-size: 12px;
    letter-spacing: 1px;
    transition: color var(--transition-speed) ease;
}

.footer-nav a:hover {
    color: var(--color-white);
}

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

.footer-bottom p {
    font-family: var(--font-primary);
    font-size: 12px;
    color: var(--color-gray-lighter);
    letter-spacing: 1px;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 1024px) {
    .nav-container {
        padding: 0 30px;
    }

    .nav-menu {
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: rgba(0, 0, 0, 0.98);
        flex-direction: column;
        gap: 0;
        padding: 30px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-speed) ease;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-menu li {
        padding: 15px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

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

    .page-title {
        letter-spacing: 5px;
    }

    .footer-content {
        flex-direction: column;
        gap: 30px;
        text-align: center;
    }

    .footer-nav {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 20px;
    }
}