/* ===================================
   優 (yuu) - 歌い手 Portfolio
   Dark × Orange | Classic Design
   =================================== */

/* --- CSS Custom Properties --- */
:root {
    /* Colors */
    --color-bg: #0d0d0d;
    --color-bg-card: #1a1a1a;
    --color-text: #e8e8e8;
    --color-text-muted: #888888;
    --color-accent: #d4803f;
    --color-accent-light: #e89c5a;
    --color-border: #333333;
    --color-border-accent: #d4803f;

    /* Typography */
    --font-heading: 'Noto Serif JP', serif;
    --font-body: 'Noto Sans JP', sans-serif;
    --font-accent: 'Cormorant Garamond', serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;

    /* Borders */
    --radius-sm: 4px;
    --border-thin: 1px solid var(--color-border);
    --border-accent: 1px solid var(--color-accent);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text);
    background-color: var(--color-bg);
    position: relative;
}

/* Background noise texture */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.03;
}

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 500;
    line-height: 1.4;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--color-accent-light);
}

/* --- Layout --- */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    position: relative;
    z-index: 1;
}

section {
    padding: var(--space-xl) 0;
    border-bottom: var(--border-thin);
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(13, 13, 13, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: var(--border-thin);
    padding: var(--space-sm) 0;
}

.nav__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav__logo {
    font-family: var(--font-accent);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text);
    letter-spacing: 0.1em;
}

.nav__links {
    display: flex;
    gap: var(--space-sm);
    list-style: none;
}

.nav__link {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    padding: 0.5rem;
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav__link:hover {
    color: var(--color-text);
}

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

/* --- Hero --- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding-top: 80px;
    border-bottom: var(--border-thin);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('hero-bg.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0.15;
    z-index: -1;
}

.hero__content {
    max-width: 600px;
}

.hero__title {
    font-family: var(--font-accent);
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 400;
    letter-spacing: 0.2em;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.hero__subtitle {
    font-family: var(--font-accent);
    font-size: 1.25rem;
    color: var(--color-accent);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.hero__tagline {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    border-top: var(--border-thin);
    border-bottom: var(--border-thin);
    padding: var(--space-sm) 0;
}

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

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border: var(--border-accent);
    background: transparent;
    color: var(--color-accent);
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: var(--radius-sm);
}

.btn:hover {
    background: var(--color-accent);
    color: var(--color-bg);
    box-shadow: 0 0 20px rgba(212, 128, 63, 0.3);
}

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

.btn--primary:hover {
    background: var(--color-accent-light);
    box-shadow: 0 0 30px rgba(212, 128, 63, 0.4);
}

.btn--icon {
    width: 20px;
    height: 20px;
}

.btn--square {
    padding: 0;
    width: 50px;
    height: 50px;
    justify-content: center;
}

.btn--square .btn--icon {
    width: 24px;
    height: 24px;
}



/* --- Section Header --- */
.section-header {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.section-header__title {
    font-family: var(--font-accent);
    font-size: 2.5rem;
    font-weight: 400;
    letter-spacing: 0.3em;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

.section-header__line {
    width: 60px;
    height: 1px;
    background: var(--color-accent);
    margin: 0 auto;
}

/* --- Latest Video --- */
.latest__video {
    max-width: 800px;
    margin: 0 auto;
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border: var(--border-thin);
    border-radius: var(--radius-sm);
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* --- Video Cards (Picks & Collab) --- */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
}

.video-card {
    border: var(--border-thin);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: all 0.3s ease;
    background: var(--color-bg-card);
}

.video-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 0 20px rgba(212, 128, 63, 0.1);
}

.video-card__thumbnail {
    position: relative;
    padding-bottom: 56.25%;
    background: var(--color-bg);
}

.video-card__thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-card__content {
    padding: var(--space-sm);
}

.video-card__title {
    font-size: 0.875rem;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-card__link {
    font-size: 0.75rem;
    color: var(--color-accent);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.video-card__link::after {
    content: '→';
    transition: transform 0.3s ease;
}

.video-card__link:hover::after {
    transform: translateX(4px);
}

/* --- About --- */
.about__content {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-lg);
    align-items: start;
    max-width: 700px;
    margin: 0 auto;
}

.about__image {
    border: var(--border-thin);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.about__image img {
    width: 100%;
    height: auto;
    display: block;
}

.about__text {
    padding-top: var(--space-sm);
}

.about__name {
    font-family: var(--font-accent);
    font-size: 1.75rem;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-xs);
}

.about__role {
    font-size: 0.75rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin-bottom: var(--space-sm);
}

.about__desc {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    margin-bottom: var(--space-md);
}

.about__links {
    display: flex;
    gap: var(--space-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: var(--border-thin);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    transition: all 0.3s ease;
}

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

.social-link svg {
    width: 18px;
    height: 18px;
}

/* --- Contact --- */
.contact__content {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

.contact__desc {
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    font-size: 0.9375rem;
}

/* --- Footer --- */
.footer {
    text-align: center;
    padding: var(--space-md) 0;
    color: var(--color-text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    border-bottom: none;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    :root {
        --space-lg: 3rem;
        --space-xl: 4rem;
    }

    .nav__links {
        display: none;
    }

    .hero__title {
        letter-spacing: 0.1em;
    }

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

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .about__content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .about__image {
        max-width: 180px;
        margin: 0 auto;
    }

    .about__links {
        justify-content: center;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }

    .section-header__title {
        font-size: 1.75rem;
        letter-spacing: 0.15em;
    }
}