/* --- Material Design 3 Color Tokens (Dark Theme) --- */
:root {
    /* Primary: 高貴な深紫 (#D0BCFF はダークテーマ用の明るい紫) */
    --m3-primary: #D0BCFF;
    --m3-on-primary: #381E72;
    --m3-primary-container: #4F378B;
    --m3-on-primary-container: #EADDFF;

    /* Secondary: 落ち着いた補色 */
    --m3-secondary: #CCC2DC;
    --m3-on-secondary: #332D41;

    /* Surface & Background: CachyOSに合う深いグレー/黒 */
    --m3-background: #1C1B1F;
    --m3-on-background: #E6E1E5;
    --m3-surface: #1C1B1F;
    --m3-surface-variant: #49454F;
    --m3-on-surface-variant: #CAC4D0;

    /* Error: 警告用 */
    --m3-error: #F2B8B5;
    --m3-on-error: #601410;
    --m3-error-container: #8C1D18;
    --m3-on-error-container: #F9DEDC;

    /* Elevation & Shape */
    --m3-radius-xl: 28px;
    --m3-radius-m: 12px;
    --transition: all 0.3s cubic-bezier(0.2, 0, 0, 1);
}

/* --- Base Styles --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--m3-background);
    color: var(--m3-on-background);
    font-family: 'Roboto', 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- App Bar --- */
.app-bar {
    height: 64px;
    display: flex;
    align-items: center;
    background-color: var(--m3-surface);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--m3-surface-variant);
}

.logo-text {
    font-size: 22px;
    font-weight: 500;
    color: var(--m3-primary);
}

/* --- Hero Section --- */
.hero-section {
    text-align: center;
    padding: 64px 0;
}

.hero-icon {
    width: 160px;
    height: 160px;
    margin-bottom: 24px;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.3));
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--m3-on-surface-variant);
    margin-bottom: 32px;
}

/* --- M3 Components --- */

/* Buttons */
.m3-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0 24px;
    height: 40px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.m3-button.primary {
    background-color: var(--m3-primary);
    color: var(--m3-on-primary);
}

.m3-button:hover {
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
    opacity: 0.9;
}

/* Cards */
.m3-card {
    background-color: var(--m3-surface-variant);
    color: var(--m3-on-surface-variant);
    border-radius: var(--m3-radius-m);
    padding: 20px;
    margin-bottom: 16px;
}

.m3-card.outline {
    background-color: transparent;
    border: 1px solid var(--m3-surface-variant);
}

.error-container {
    background-color: var(--m3-error-container);
    color: var(--m3-on-error-container);
}

/* Status Badge */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--m3-primary-container);
    color: var(--m3-on-primary-container);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
}

/* Accordion (Details/Summary) */
.m3-accordion {
    background-color: var(--m3-surface-variant);
    margin-bottom: 8px;
    border-radius: var(--m3-radius-m);
    overflow: hidden;
}

.m3-accordion summary {
    padding: 16px;
    font-weight: 500;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
}

.m3-accordion summary::after {
    content: 'expand_more';
    font-family: 'Material Icons Sharp';
}

.m3-accordion[open] summary::after {
    content: 'expand_less';
}

.details-content {
    padding: 0 16px 16px 16px;
    color: var(--m3-on-background);
}

/* Code block */
code {
    display: block;
    background: #000;
    color: #0f0; /* Terminal feel */
    padding: 12px;
    border-radius: 8px;
    font-family: monospace;
    margin: 12px 0;
}

/* --- Footer --- */
.footer {
    text-align: center;
    padding: 48px 0;
    color: var(--m3-on-surface-variant);
    font-size: 0.8rem;
}