/**
 * IDOL TOKYO NEO
 * Reset, Base Styles & Decorative Backgrounds
 */

/* ==========================================================================
   1. BOX RESET & BASE HTML
   ========================================================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--bg-base);
    background-image: url('../images/bg-sky.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    color: var(--text-main);
    font-family: var(--font-jp);
    line-height: 24px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
    transition: background-color 0.5s ease, color 0.5s ease;
}

img, svg, video, iframe {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ==========================================================================
   2. WING PARALLAX BACKGROUND CONTAINER
   ========================================================================== */
#wing-bg-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
    background-image: url('../images/wing-bg.png');
    background-repeat: repeat;
    background-size: 100% auto;
    background-position: center top;
    filter: blur(1px);
    opacity: 0.6;
    will-change: background-position, opacity;
    transition: background-position 0.6s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.3s ease;
}

/* スマホ表示時：羽画像の拡大最適化 */
@media (max-width: 767px) {
    #wing-bg-container {
        background-size: 150% auto;
    }
}

@media (max-width: 480px) {
    #wing-bg-container {
        background-size: 180% auto;
    }
}

/* ==========================================================================
   3. BASIC ELEMENT SETTINGS
   ========================================================================== */
a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease, opacity 0.3s ease;
}

ul, ol {
    list-style: none;
}

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

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0;
    position: relative;
    z-index: 2;
    box-sizing: border-box;
}

/* ==========================================================================
   4. CUSTOM SCROLLBARS (LIGHT & DARK DUAL THEME)
   ========================================================================== */
.scroll-container,
.schedule-tabs,
.filter-controls,
.system-tabs,
.system-cards-container,
.form-course-tabs,
.weekly-cards-scroll-container,
.gantt-chart-scroll-wrap {
    scrollbar-width: thin;
    scrollbar-color: var(--accent-main) var(--bg-surface);
}

.scroll-container::-webkit-scrollbar,
.schedule-tabs::-webkit-scrollbar,
.filter-controls::-webkit-scrollbar,
.system-tabs::-webkit-scrollbar,
.system-cards-container::-webkit-scrollbar,
.form-course-tabs::-webkit-scrollbar,
.weekly-cards-scroll-container::-webkit-scrollbar,
.gantt-chart-scroll-wrap::-webkit-scrollbar {
    height: 8px;
    width: 8px;
}

.scroll-container::-webkit-scrollbar-track,
.schedule-tabs::-webkit-scrollbar-track,
.filter-controls::-webkit-scrollbar-track,
.system-tabs::-webkit-scrollbar-track,
.system-cards-container::-webkit-scrollbar-track,
.form-course-tabs::-webkit-scrollbar-track,
.weekly-cards-scroll-container::-webkit-scrollbar-track,
.gantt-chart-scroll-wrap::-webkit-scrollbar-track {
    background: var(--bg-surface);
    border-radius: 4px;
}

.scroll-container::-webkit-scrollbar-thumb,
.schedule-tabs::-webkit-scrollbar-thumb,
.filter-controls::-webkit-scrollbar-thumb,
.system-tabs::-webkit-scrollbar-thumb,
.system-cards-container::-webkit-scrollbar-thumb,
.form-course-tabs::-webkit-scrollbar-thumb,
.weekly-cards-scroll-container::-webkit-scrollbar-thumb,
.gantt-chart-scroll-wrap::-webkit-scrollbar-thumb {
    background: var(--accent-main);
    border-radius: 4px;
}

/* 黒背景ライブ空間上でのスクロールバートラック調整 */
#schedule .schedule-tabs::-webkit-scrollbar-track,
#cast .filter-controls::-webkit-scrollbar-track,
.idol-diary-wrapper .system-tabs::-webkit-scrollbar-track,
.idol-diary-wrapper .system-cards-container::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

.idol-diary-wrapper .system-tabs::-webkit-scrollbar-thumb,
.idol-diary-wrapper .system-cards-container::-webkit-scrollbar-thumb {
    background: var(--dark-accent);
}