/* News article pages — Clear Professional (design-guidelines.md) */

:root {
    --ink: #172033;
    --muted: #657084;
    --line: #DFE5EE;
    --paper: #FFFFFF;
    --canvas: #F4F6FA;
    --navy-950: #031B68;
    --navy-800: #1E2D6E;
    --purple-700: #6C4DA4;
    --purple-100: #F1EDFB;
    --radius-sm: 6px;
    --radius-md: 8px;
    --shadow-tight: 0 8px 24px rgba(20, 32, 62, 0.10);
}

body {
    margin: 0;
    background: var(--canvas);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.8;
}

.news-article__inner {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}

.news-article__hero {
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 28px 0 32px;
}

.news-article__back {
    display: inline-block;
    margin-bottom: 16px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
}

.news-article__back:hover {
    color: var(--navy-800);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.news-article__tag {
    display: inline-flex;
    align-items: center;
    margin-bottom: 12px;
    padding: 4px 10px;
    border-radius: 999px;
    background: var(--purple-100);
    color: var(--navy-800);
    font-size: 11px;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.news-article__title {
    margin: 0 0 8px;
    color: var(--navy-950);
    font-size: clamp(1.75rem, 4vw, 2.125rem);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: 0;
}

.news-article__meta {
    margin: 0 0 24px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.4;
}

.news-article__figure {
    margin: 0;
}

.news-article__figure img {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-tight);
}

.news-article__body {
    background: var(--paper);
    padding: 32px 0 40px;
}

.news-article__body p {
    margin: 0 0 1.25em;
    color: var(--muted);
    font-size: 16px;
    line-height: 1.8;
}

.news-article__body p:last-child {
    margin-bottom: 0;
}

.news-article__study {
    padding: 8px 0 48px;
}

.news-study-card {
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-tight);
}

.news-study-card:last-child {
    margin-bottom: 0;
}

.news-study-card h2 {
    margin: 0 0 16px;
    color: var(--navy-950);
    font-size: 22px;
    font-weight: 700;
    line-height: 1.35;
}

.news-study-card ol {
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: study-item;
}

.news-study-card li {
    counter-increment: study-item;
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
    color: var(--muted);
    font-size: 15px;
    line-height: 1.65;
}

.news-study-card li:last-child {
    border-bottom: 0;
    padding-bottom: 0;
}

.news-study-card li::before {
    content: counter(study-item) ".";
    display: inline-block;
    min-width: 1.75em;
    color: var(--purple-700);
    font-weight: 700;
}

.news-vocab-head {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-right: 0.15em;
    vertical-align: baseline;
}

.news-vocab-list li strong {
    color: var(--ink);
    font-weight: 600;
}

.vocab-dict-btn {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: var(--navy-800);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    cursor: pointer;
    transition: background 0.15s ease;
}

.vocab-dict-btn:hover {
    background: var(--navy-950);
}

.vocab-dict-btn:focus-visible {
    outline: 2px solid var(--purple-700);
    outline-offset: 2px;
}

.vocab-audio__source {
    display: none;
}

.vocab-dict-btn svg {
    width: 11px;
    height: 11px;
}

.vocab-dict-btn .vocab-audio__icon-play {
    display: block !important;
}

.vocab-dict-btn .vocab-audio__icon-pause,
.vocab-dict-btn .vocab-audio__spinner,
.vocab-audio.is-playing .vocab-dict-btn .vocab-audio__icon-play,
.vocab-audio.is-loading .vocab-dict-btn .vocab-audio__icon-play,
.vocab-audio.is-loading .vocab-dict-btn .vocab-audio__icon-pause {
    display: none !important;
}

.vocab-audio.is-playing .vocab-dict-btn .vocab-audio__icon-pause,
.vocab-audio.is-loading .vocab-dict-btn .vocab-audio__spinner {
    display: block !important;
}

.vocab-audio__spinner {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-top-color: #fff;
    animation: vocab-audio-spin 0.7s linear infinite;
}

@keyframes vocab-audio-spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 640px) {
    .news-article__hero {
        padding: 20px 0 24px;
    }

    .news-article__body {
        padding: 24px 0 32px;
    }

    .news-study-card {
        padding: 20px 16px;
    }
}