/* ============================================================
   MIE LLC — common.css
   全ページ共通スタイル
   ============================================================ */

/* ── CSS VARIABLES ── */
:root {
    --font-serif-jp: 'Noto Serif JP', serif;
    --font-sans-jp:  'Noto Sans JP', sans-serif;
    --font-en:       'Inter', 'Montserrat', sans-serif;
    --color-text:    #1a1a1a;
    --color-sub:     #555555;
    --color-muted:   #999999;
    --color-border:  #e8e8e8;
    --color-bg:      #f7f7f7;
    --color-accent:  #FFF700;
}

/* ── RESET / BASE ── */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans-jp);
    color: var(--color-text);
    background: #ffffff;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ── TYPOGRAPHY ── */
.font-serif { font-family: var(--font-serif-jp); }
.font-sans  { font-family: var(--font-sans-jp); }
.font-en    { font-family: var(--font-en); }

.section-label {
    font-family: var(--font-en);
    font-size: 0.65rem;
    letter-spacing: 0.35em;
    text-transform: uppercase;
    color: var(--color-muted);
}

/* ── NAV LINK ── */
.nav-link {
    color: rgba(17,17,17,0.55);
    text-decoration: none;
    transition: color 0.25s;
    position: relative;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: #FFF700;
    transition: width 0.25s;
}
.nav-link:hover {
    color: #111111;
}
.nav-link:hover::after {
    width: 100%;
}

/* ── HEADER ── */
#site-header {
    transition: background 0.4s, box-shadow 0.4s;
}
#site-header.scrolled {
    background: rgba(255,255,255,0.97) !important;
    backdrop-filter: blur(20px);
    box-shadow: 0 1px 24px rgba(0,0,0,0.07);
}
#site-header.scrolled .dropdown-trigger {
    color: #555555 !important;
}

/* ── DROPDOWN ── */
.dropdown { position: relative; }
.dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 14px);
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    border: 1px solid #ebebeb;
    border-radius: 6px;
    padding: 8px 0;
    min-width: 200px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.1);
    white-space: nowrap;
    z-index: 100;
}
.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 6px solid #ebebeb;
}
.dropdown-menu::after {
    content: '';
    position: absolute;
    top: -5px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 6px solid rgba(255,255,255,0.98);
}
.dropdown:hover .dropdown-menu,
.dropdown:focus-within .dropdown-menu {
    display: block;
    animation: fadeDropdown 0.2s ease;
}
@keyframes fadeDropdown {
    from { opacity: 0; transform: translateX(-50%) translateY(-6px); }
    to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}
.dropdown-item {
    display: block;
    padding: 10px 20px;
    font-family: var(--font-sans-jp);
    font-size: 0.7rem;
    color: #555;
    text-decoration: none;
    transition: background 0.15s, color 0.15s;
    letter-spacing: 0.05em;
}
.dropdown-item:hover {
    background: #f8f8f8;
    color: #1a1a1a;
}
.dropdown-divider {
    height: 1px;
    background: #e8e8e8;
    margin: 4px 0;
}

/* ── MOBILE MENU ── */
.mobile-sub {
    display: none;
    background: #fafafa;
    border-left: 2px solid var(--color-accent);
    margin-left: 1.5rem;
}
.mobile-sub.open { display: block; }
.mobile-sub-item {
    display: block;
    padding: 10px 24px;
    font-family: var(--font-sans-jp);
    font-size: 0.72rem;
    color: #777;
    text-decoration: none;
    transition: color 0.15s;
}
.mobile-sub-item:hover { color: #1a1a1a; }

/* ── SCROLL REVEAL ── */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.85s ease, transform 0.85s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ── PAGE HERO (サブページ共通) ── */
.page-hero { background: #0d0d0d; }

/* ── ACCORDION ── */
.accordion-body {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.45s cubic-bezier(0.4,0,0.2,1), opacity 0.35s ease;
    opacity: 0;
}
.accordion-body.open {
    grid-template-rows: 1fr;
    opacity: 1;
}
.accordion-inner { overflow: hidden; }
.accordion-trigger {
    cursor: pointer;
    transition: color 0.2s;
}
.accordion-trigger:hover { color: #1a1a1a; }
.accordion-chevron {
    transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
    flex-shrink: 0;
}
.accordion-trigger.open .accordion-chevron { transform: rotate(180deg); }

/* ── FOOTER LINK ── */
.footer-link {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.35);
    text-decoration: none;
    transition: color 0.2s;
    position: relative;
    padding-left: 0;
}
.footer-link::before {
    content: '';
    display: inline-block;
    width: 0;
    height: 1px;
    background: #FFF700;
    vertical-align: middle;
    margin-right: 0;
    transition: width 0.25s, margin-right 0.25s;
}
.footer-link:hover {
    color: #FFF700;
}
.footer-link:hover::before {
    width: 1rem;
    margin-right: 0.5rem;
}

/* ── FORM FIELD ── */
.form-field {
    width: 100%;
    padding: 1rem 1.25rem;
    background: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: 2px;
    font-family: var(--font-sans-jp);
    font-size: 0.875rem;
    color: var(--color-text);
    outline: none;
    transition: border-color 0.25s;
}
.form-field:focus { border-color: #1a1a1a; }
.form-field::placeholder { color: #bbbbbb; }