/* ========================================
   ROUA Website Styles
   Color Palette: Dark Navy + Blue accents
   ======================================== */

/* ---- CSS Variables ---- */
:root {
    /* Colors */
    --color-bg: #0a1628;
    --color-bg-light: #0f1f35;
    --color-bg-card: #162032;
    --color-primary: #0693e3;
    --color-primary-light: #7ec8e3;
    --color-accent: #00d4ff;
    --color-text: #ffffff;
    --color-text-muted: #a0aec0;
    --color-text-dim: #64748b;
    --color-border: #1e3a5f;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0693e3 0%, #00d4ff 100%);
    --gradient-bg: linear-gradient(180deg, #0a1628 0%, #0f1f35 100%);

    /* Typography */
    --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

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

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

ul,
ol {
    list-style: none;
}

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

/* ---- Container ---- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ---- Typography ---- */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
}

.section-label {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: var(--space-lg);
}

.highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(6, 147, 227, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

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

.btn-full {
    width: 100%;
}

/* ---- Navigation ---- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-sm) 0;
    background: rgba(10, 22, 40, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-base);
}

.nav.scrolled {
    border-bottom-color: var(--color-border);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.nav-logo img {
    height: 32px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-links a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-text);
}

.lang-switch {
    padding: 0.25rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.lang-switch:hover {
    border-color: var(--color-primary);
    color: var(--color-primary) !important;
}

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

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-fast);
}

/* ---- Hero Section ---- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl) var(--container-padding);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    background-image: url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(6, 147, 227, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(0, 212, 255, 0.1) 0%, transparent 50%);
}

.hero-particles {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(1px 1px at 20% 30%, rgba(255, 255, 255, 0.3) 0%, transparent 50%),
        radial-gradient(1px 1px at 40% 70%, rgba(255, 255, 255, 0.2) 0%, transparent 50%),
        radial-gradient(1px 1px at 60% 40%, rgba(255, 255, 255, 0.3) 0%, transparent 50%),
        radial-gradient(1px 1px at 80% 80%, rgba(255, 255, 255, 0.2) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
}

.hero-cta {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-text-dim);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    animation: scrollPulse 2s infinite;
}

@keyframes scrollPulse {

    0%,
    100% {
        opacity: 0.3;
        transform: scaleY(0.5);
    }

    50% {
        opacity: 1;
        transform: scaleY(1);
    }
}

/* ---- Projects Section ---- */
.projects {
    position: relative;
    padding: var(--space-2xl) 0;
    background: var(--color-bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.project-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-primary);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.project-image {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.project-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-light) 100%);
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
    opacity: 0.3;
}

.project-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 22, 40, 0.9);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--gradient-primary);
    color: var(--color-bg);
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: transform var(--transition-fast);
}

.project-link:hover {
    transform: scale(1.05);
}

.project-content {
    padding: var(--space-md);
}

.project-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-xs);
}

.project-title {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.project-desc {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

/* Projects decoration */
.projects-decoration {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.decoration-star {
    position: absolute;
    color: var(--color-primary);
    font-size: 1.5rem;
    opacity: 0.3;
    animation: twinkle 3s infinite;
}

.star-1 {
    top: 10%;
    left: 5%;
    animation-delay: 0s;
}

.star-2 {
    top: 30%;
    right: 8%;
    animation-delay: 1s;
}

.decoration-circle {
    position: absolute;
    bottom: -50px;
    left: -50px;
    width: 200px;
    height: 200px;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    opacity: 0.3;
}

@keyframes twinkle {

    0%,
    100% {
        opacity: 0.3;
        transform: scale(1);
    }

    50% {
        opacity: 0.6;
        transform: scale(1.2);
    }
}

/* ---- About Section ---- */
.about {
    padding: var(--space-2xl) 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.about-text {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.about-text strong {
    color: var(--color-text);
}

.about-values {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.value-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
}

.value-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    background: rgba(6, 147, 227, 0.1);
    border: 1px solid rgba(6, 147, 227, 0.2);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.value-text h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.value-text p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.about-visual {
    display: flex;
    justify-content: center;
}

.about-card {
    position: relative;
    width: 100%;
    max-width: 400px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    /* グロウ効果 */
    box-shadow:
        0 0 0 1px rgba(6, 147, 227, 0.2),
        0 0 40px rgba(6, 147, 227, 0.12),
        0 20px 60px rgba(0, 0, 0, 0.4);
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.about-card:hover {
    transform: translateY(-6px);
    box-shadow:
        0 0 0 1px rgba(0, 212, 255, 0.4),
        0 0 60px rgba(6, 147, 227, 0.25),
        0 30px 80px rgba(0, 0, 0, 0.5);
}

/* 画像エリア */
.card-image-area {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
}

.card-image-area img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    background: linear-gradient(135deg,
            rgba(6, 147, 227, 0.15) 0%,
            rgba(0, 212, 255, 0.08) 50%,
            rgba(10, 22, 40, 0.9) 100%);
    border-bottom: 1px solid var(--color-border);
}

.card-image-icon {
    font-size: 3rem;
    opacity: 0.5;
}

.card-image-label {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--color-primary);
    opacity: 0.6;
    text-transform: uppercase;
}

/* バッジ（EST. 2019） */
.card-badge {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    padding: 0.25rem 0.75rem;
    background: rgba(10, 22, 40, 0.85);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    backdrop-filter: blur(8px);
}

/* カードコンテンツ */
.card-content {
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.card-quote {
    font-size: 1.1rem;
    font-weight: 600;
    font-style: italic;
    text-align: center;
    color: var(--color-text);
    line-height: 1.5;
}

/* タグピル */
.card-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}

.card-tag-pill {
    padding: 0.3rem 0.75rem;
    background: rgba(6, 147, 227, 0.1);
    border: 1px solid rgba(6, 147, 227, 0.25);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    color: var(--color-primary-light);
}


/* ---- Join Section ---- */
.join {
    position: relative;
    padding: var(--space-2xl) 0;
    background: var(--color-bg-light);
}

.join-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.join-text {
    font-size: 1.0625rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.join-looking {
    text-align: left;
    padding: var(--space-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-xl);
}

.join-looking h3 {
    font-size: 1rem;
    margin-bottom: var(--space-md);
}

.looking-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.looking-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-muted);
}

.list-icon {
    color: var(--color-primary);
    font-weight: 500;
}

.join-form {
    text-align: left;
}

.join-form h3 {
    font-size: 1.125rem;
    margin-bottom: var(--space-md);
    text-align: center;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.form-group input,
.form-group textarea {
    padding: 0.875rem 1rem;
    font-family: inherit;
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Join decoration */
.join-decoration {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.star-3 {
    top: 20%;
    right: 10%;
    animation-delay: 0.5s;
}

.star-4 {
    bottom: 30%;
    left: 5%;
    animation-delay: 1.5s;
    font-size: 1rem;
}

/* ---- Footer ---- */
.footer {
    padding: var(--space-xl) 0 var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.footer-logo {
    font-size: 1.25rem;
    font-weight: 700;
}

.footer-tagline {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.social-link:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.social-text {
    font-size: 0.875rem;
    font-weight: 500;
}

.footer-lang {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
}

.lang-link {
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.lang-link:hover {
    color: var(--color-primary);
}

.lang-current {
    color: var(--color-text);
    font-weight: 500;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: 0.8125rem;
    color: var(--color-text-dim);
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .about-visual {
        order: -1;
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        padding: var(--space-md);
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-cta .btn {
        width: 100%;
        max-width: 280px;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

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

/* ---- Animations ---- */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---- Utility ---- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}