/* ==========================================
   Buildings and under the railway Font
   ========================================== */
@font-face {
    font-family: 'BUR';
    src: url('Buildingsandundertherailwaytracksfree_ver.otf') format('opentype');
    font-display: swap;
}

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

:root {
    --color-bg: #c8c8c8;
    --color-text: #000;
    --color-white: #fff;
    --color-black: #000;
    --font-primary: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    overflow: hidden;
    transition: background-color 0.8s var(--transition-smooth);
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
    color: inherit;
    font-size: inherit;
}

/* ==========================================
   Loading Screen - ANRI Style (Black with rotating circle)
   ========================================== */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

#loading-screen.loaded {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Center video - appears FIRST */
.loader-video {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 300px;
    max-height: 200px;
    width: auto;
    height: auto;
    opacity: 0;
    animation: loaderVideoIn 0.6s ease 0.1s forwards;
    z-index: 2;
}

@keyframes loaderVideoIn {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.9);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

/* Keep text styles for other pages */
.loader-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #000;
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    white-space: nowrap;
    opacity: 0;
    animation: loaderTextIn 0.6s ease 0.1s forwards;
    z-index: 2;
}

@keyframes loaderTextIn {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.9);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

.loader-text .text-bold {
    font-weight: 700;
}

.loader-text .text-italic {
    font-style: italic;
    font-weight: 400;
}

/* Orbit container - perfect circle like ANRI */
.loader-orbit {
    position: absolute;
    width: 90vmin;
    height: 90vmin;
    opacity: 0;
    animation: loaderOrbitIn 0.8s ease 0.5s forwards;
}

@keyframes loaderOrbitIn {
    0% {
        opacity: 0;
        transform: scale(0.8);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* Circle border - solid thin line like ANRI */
.loader-orbit::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-radius: 50%;
    box-sizing: border-box;
    animation: orbitCircleRotate 8s linear infinite;
}

@keyframes orbitCircleRotate {
    from { transform: rotateZ(0deg); }
    to { transform: rotateZ(360deg); }
}

/* Percentage indicators - appear AFTER circle */
.loader-percent {
    position: absolute;
    color: #000;
    font-size: 1.1rem;
    font-weight: 700;
    font-style: italic;
    opacity: 0;
    white-space: nowrap;
}

/* Initial positions - will be overridden by JS */
.loader-percent.top-right {
    top: 50%;
    left: 50%;
}

.loader-percent.bottom-left {
    top: 50%;
    left: 50%;
}

/* Hide old loader-circle */
.loader-circle {
    display: none;
}

.loader-bar {
    display: none;
}

.loader-progress {
    display: none;
}

@keyframes fadeInText {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================
   Header
   ========================================== */
.header {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6px 25px;
    background: var(--color-white);
    border-radius: 50px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    gap: 25px;
    opacity: 0;
    animation: fadeInDown 0.8s ease 2.2s forwards;
    white-space: nowrap;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

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

.logo-img {
    height: 24px;
    width: auto;
    display: block;
}

.logo-text {
    font-family: 'BUR', 'Noto Sans JP', sans-serif;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.nav-center {
    display: flex;
    align-items: center;
    gap: 20px;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.85rem;
    font-weight: 500;
}

.lang {
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

.lang.active {
    opacity: 1;
    font-weight: 700;
}

.lang-divider {
    opacity: 0.3;
}

.nav-link {
    font-size: 0.75rem;
    font-weight: 500;
    position: relative;
    padding: 3px 0;
    transition: opacity 0.3s ease;
}

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

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

.nav-link.active {
    font-weight: 700;
}

.nav-divider {
    opacity: 0.3;
    margin: 0 5px;
}

.story-of {
    font-style: italic;
    font-size: 0.7rem;
    opacity: 0.7;
}

.featured-company {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border: 1px solid rgba(0, 0, 0, 0.2);
    border-radius: 15px;
    font-size: 0.7rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.featured-company:hover {
    background: var(--color-black);
    color: var(--color-white);
}

.featured-company .arrow {
    font-size: 0.6rem;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 10px;
}

.menu-line {
    width: 24px;
    height: 2px;
    background: var(--color-black);
    transition: all 0.3s ease;
}

/* ==========================================
   Mobile Menu
   ========================================== */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-white);
    z-index: 999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 40px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
}

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

.mobile-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.mobile-nav-link {
    font-size: 2rem;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.mobile-nav-link.active {
    font-weight: 700;
}

.mobile-lang {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
}

/* ==========================================
   Main & Hero Section
   ========================================== */
.main {
    width: 100%;
    height: 100vh;
    position: relative;
    overflow: hidden;
}

.hero {
    width: 100%;
    height: 100vh;
    position: absolute;
    top: 0;
    left: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

.hero.active {
    opacity: 1;
    visibility: visible;
}

.hero:first-of-type {
    opacity: 1;
    visibility: visible;
}

#three-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* ==========================================
   Hero Content
   ========================================== */
.hero-content {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    text-align: center;
    opacity: 0;
    animation: fadeInUp 1s ease 2.5s forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.hero-title {
    display: flex;
    flex-direction: row;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 0;
    white-space: nowrap;
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
}

.title-line {
    font-size: inherit;
    line-height: 1.1;
}

.title-single {
    font-weight: 500;
    letter-spacing: 0.1em;
}

.title-bold {
    font-weight: 700;
    letter-spacing: 0.02em;
}

.title-italic {
    font-style: italic;
    font-weight: 400;
    letter-spacing: 0.02em;
}

/* 3D Logo */
.logo-3d {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
}

.logo-letter {
    font-size: clamp(4rem, 15vw, 10rem);
    font-weight: 900;
    color: transparent;
    -webkit-text-stroke: 2px var(--color-black);
    text-stroke: 2px var(--color-black);
    position: relative;
    display: inline-block;
    animation: letterFloat 3s ease-in-out infinite;
    animation-delay: calc(var(--i) * 0.2s);
}

.logo-letter:nth-child(1) { --i: 0; }
.logo-letter:nth-child(2) { --i: 1; }
.logo-letter:nth-child(3) { --i: 2; }
.logo-letter:nth-child(4) { --i: 3; }

@keyframes letterFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-10px) rotate(-2deg); }
    75% { transform: translateY(10px) rotate(2deg); }
}

/* ==========================================
   Navigation Circles (Prev/Next)
   ========================================== */
.nav-circle {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 120px;
    height: 120px;
    background: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 600;
    font-style: italic;
    z-index: 100;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.4s var(--transition-smooth);
    opacity: 0;
    animation: fadeIn 0.8s ease 2.8s forwards;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

.nav-prev {
    left: 30px;
}

.nav-next {
    right: 30px;
}

.nav-circle:hover {
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.15);
}

.nav-arrow {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.nav-prev:hover .nav-arrow {
    transform: translateX(-5px);
}

.nav-next:hover .nav-arrow {
    transform: translateX(5px);
}

/* ==========================================
   Bottom Navigation
   ========================================== */
.bottom-nav {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 40px;
    z-index: 100;
    opacity: 0;
    animation: fadeIn 0.8s ease 3s forwards;
}

.bottom-link {
    font-size: 1rem;
    font-weight: 400;
    opacity: 0.3;
    transition: all 0.3s ease;
}

.bottom-link.prev-page,
.bottom-link.next-page {
    min-width: 100px;
    text-align: center;
}

.bottom-link.prev-page {
    text-align: right;
}

.bottom-link.next-page {
    text-align: left;
}

.bottom-link.current-page {
    font-size: 2.5rem;
    font-weight: 700;
    opacity: 1;
}

.bottom-link:hover {
    opacity: 0.7;
}

/* ==========================================
   Scroll Indicator
   ========================================== */
.scroll-indicator {
    position: fixed;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    opacity: 0;
    animation: fadeIn 0.8s ease 3.2s forwards, bounce 2s ease-in-out infinite 3.5s;
}

.scroll-text {
    font-size: 0.9rem;
    font-weight: 400;
    font-style: italic;
    letter-spacing: 0.05em;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

/* ==========================================
   Page Dots
   ========================================== */
.page-dots {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 100;
    opacity: 0;
    animation: fadeIn 0.8s ease 3.4s forwards;
}

.dot {
    width: 8px;
    height: 8px;
    background: var(--color-black);
    border-radius: 50%;
    opacity: 0.3;
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot.active {
    opacity: 1;
    transform: scale(1.2);
}

.dot:hover {
    opacity: 0.7;
}

/* モバイルのみ表示する4つ目のドット(会社概要用) */
.dot.mobile-only {
    display: none;
}

@media (max-width: 768px) {
    .dot.mobile-only {
        display: block;
    }
}

/* ==========================================
   View Button
   ========================================== */
.view-button {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    background: var(--color-black);
    color: var(--color-white);
    font-size: 1rem;
    font-weight: 500;
    border-radius: 0;
    transition: all 0.3s ease;
    z-index: 100;
}

.view-button:hover {
    background: #333;
}

.view-page {
    margin: 0 5px;
}

.view-arrow {
    margin-left: 10px;
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 1024px) {
    .nav-circle {
        width: 80px;
        height: 80px;
        font-size: 0.85rem;
    }

    .nav-prev {
        left: 15px;
    }

    .nav-next {
        right: 15px;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 10px 20px;
    }

    .nav-center {
        display: none;
    }

    /* モバイルメニューボタン非表示（Viewボタンで遷移するため不要） */
    .menu-toggle {
        display: none;
    }

    .mobile-menu {
        display: none;
    }

    .nav-circle {
        width: 45px;
        height: 45px;
        font-size: 0;
    }

    .nav-arrow {
        font-size: 1.5rem;
    }

    .nav-text {
        display: none;
    }

    .bottom-nav {
        gap: 15px;
        flex-wrap: nowrap;
    }

    .bottom-link {
        font-size: 0.75rem;
        white-space: nowrap;
    }

    .bottom-link.prev-page,
    .bottom-link.next-page {
        min-width: 80px;
    }

    .bottom-link.current-page {
        font-size: 1.4rem;
    }

    .view-button {
        padding: 12px 20px;
        font-size: 0.85rem;
        gap: 5px;
        white-space: nowrap;
        bottom: 60px;
    }

    .view-page {
        margin: 0 3px;
    }

    .view-arrow {
        margin-left: 5px;
    }

    .hero-title .title-line {
        font-size: 2rem;
    }

    .logo-letter {
        font-size: 4rem;
    }
}

@media (max-width: 480px) {
    .header {
        width: auto;
        padding: 8px 15px;
        justify-content: center;
    }

    .nav-circle {
        width: 38px;
        height: 38px;
    }

    .nav-prev {
        left: 10px;
    }

    .nav-next {
        right: 10px;
    }

    .bottom-nav {
        gap: 10px;
        padding: 0 10px;
    }

    .bottom-link {
        font-size: 0.7rem;
    }

    .bottom-link.prev-page,
    .bottom-link.next-page {
        min-width: 70px;
    }

    .bottom-link.current-page {
        font-size: 1.2rem;
    }

    .view-button {
        padding: 10px 15px;
        font-size: 0.75rem;
        bottom: 50px;
    }

    .logo-letter {
        font-size: 3rem;
        -webkit-text-stroke: 1px var(--color-black);
    }
}

/* ==========================================
   Menu Toggle Animation
   ========================================== */
.menu-toggle.active .menu-line:first-child {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active .menu-line:last-child {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ==========================================
   Page Transition
   ========================================== */
.page-transition {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-black);
    z-index: 9999;
    transform: translateY(100%);
    transition: transform 0.6s var(--transition-smooth);
}

.page-transition.active {
    transform: translateY(0);
}

/* ==========================================
   3D Objects Animation Classes
   ========================================== */
.float-object {
    position: absolute;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(5deg);
    }
}

/* Glass effect */
.glass-object {
    opacity: 0.7;
    filter: blur(0.5px);
}

/* Metal effect */
.metal-object {
    filter: contrast(1.2) brightness(1.1);
}