/* ===== Design Tokens ===== */
:root {
    --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --color-bg: #F5F1EA;
    --color-surface: #FFFFFF;
    --color-text: #1A1A1A;
    --color-text-secondary: #3A3A3A;
    --color-text-muted: #6B6560;
    --color-rule: #1A1A1A;
    --color-rule-light: #C8C2B8;
    --color-accent: #8B2500;
    --color-accent-hover: #A63000;
    --color-link: #2A5A8D;
    --color-link-hover: #1D4068;
    --color-border: #DDD8CF;
    --color-error: #8B2500;

    --max-w: 760px;
    --transition: 200ms ease;
}

[hidden] { display: none !important; }

/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100dvh;
    -webkit-font-smoothing: antialiased;
}

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

/* ===== Rules (horizontal lines) ===== */
.rule {
    border: none;
    background: var(--color-rule);
}
.rule.thick { height: 3px; }
.rule.thin { height: 1px; }

/* ===== Login Screen ===== */
.login-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100dvh;
    padding: 2rem;
    background: var(--color-bg);
}

.login-card {
    width: 100%;
    max-width: 360px;
    text-align: center;
    animation: fadeIn 0.6s ease;
}

.login-rule {
    height: 2px;
    background: var(--color-rule);
    margin: 1rem 0;
}

.login-title {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 900;
    letter-spacing: -0.02em;
    margin: 0.75rem 0 0.25rem;
}

.login-edition {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

.login-form {
    margin-top: 1.5rem;
}

.login-form input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition);
}

.login-form input:focus {
    border-color: var(--color-rule);
}

.login-form input::placeholder {
    color: var(--color-text-muted);
}

.login-btn {
    width: 100%;
    margin-top: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--color-text);
    color: var(--color-bg);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: background var(--transition);
}

.login-btn:hover {
    background: var(--color-accent);
}

.login-error {
    color: var(--color-error);
    font-size: 0.85rem;
    margin-top: 0.75rem;
    animation: shake 0.4s ease;
}

/* ===== Masthead ===== */
.masthead {
    background: var(--color-bg);
    padding: 0.75rem 1.25rem 0;
}

.masthead-inner {
    max-width: var(--max-w);
    margin: 0 auto;
}

.masthead-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.masthead-edition {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-text-muted);
}

.logout-btn {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    transition: color var(--transition);
}

.logout-btn:hover {
    color: var(--color-accent);
}

.masthead-title {
    font-family: var(--font-serif);
    font-size: 2.8rem;
    font-weight: 900;
    text-align: center;
    letter-spacing: -0.02em;
    padding: 0.4rem 0 0.3rem;
}

.masthead-date {
    text-align: center;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-text-muted);
    padding: 0.5rem 0 0.75rem;
}

/* ===== Section Navigation ===== */
.section-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg);
    border-top: 1px solid var(--color-rule);
    border-bottom: 1px solid var(--color-rule);
}

.section-nav-inner {
    display: flex;
    max-width: var(--max-w);
    margin: 0 auto;
}

.section-tab {
    flex: 1;
    padding: 0.75rem 0.5rem;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    text-align: center;
    border-bottom: 2px solid transparent;
    transition: color var(--transition), border-color var(--transition);
}

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

.section-tab.active {
    color: var(--color-text);
    border-bottom-color: var(--color-accent);
}

.section-tab + .section-tab {
    border-left: 1px solid var(--color-rule-light);
}

/* ===== Date Navigation ===== */
.date-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 1.25rem 1.25rem 0.25rem;
}

.nav-arrow {
    font-size: 1.75rem;
    line-height: 1;
    color: var(--color-text-muted);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: color var(--transition), background var(--transition);
}

.nav-arrow:hover {
    color: var(--color-text);
    background: rgba(0,0,0,0.05);
}

.nav-arrow:disabled {
    opacity: 0.25;
    pointer-events: none;
}

.date-label {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    min-width: 220px;
    text-align: center;
}

/* ===== Content Area ===== */
.content-area {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0.5rem 1.25rem 2.5rem;
}

/* ===== News Cards ===== */
.news-card {
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem 0;
    animation: fadeSlideUp 0.35s ease backwards;
}

.news-card:last-child {
    border-bottom: none;
}

.card-top-line {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.card-category {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    padding: 0.2rem 0.5rem;
    border: 1px solid;
    margin-bottom: 0.5rem;
}

.card-date-badge {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Category colors — subtle, editorial */
.cat-forschung { border-color: #2A5A8D; color: #2A5A8D; }
.cat-gesundheit { border-color: #5A7A3A; color: #5A7A3A; }
.cat-training { border-color: #8B5E3C; color: #8B5E3C; }
.cat-ernaehrung { border-color: #2E7D6A; color: #2E7D6A; }
.cat-verhalten { border-color: #7A3B6A; color: #7A3B6A; }
.cat-default { border-color: var(--color-text-muted); color: var(--color-text-muted); }

.card-headline {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.card-summary {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
}

.card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.card-source {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition);
}

a.card-source:hover {
    color: var(--color-link);
}

.details-toggle {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    transition: color var(--transition);
}

.details-toggle:hover {
    color: var(--color-accent-hover);
}

/* ===== Card Details (expandable) ===== */
.card-details {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--color-border);
    animation: fadeIn 0.3s ease;
}

.card-details-body {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
}

.card-details-body p {
    margin-bottom: 0.75rem;
}

.card-details-body p:last-child {
    margin-bottom: 0;
}

.card-details-body h3,
.card-details-body h4 {
    font-family: var(--font-serif);
    font-weight: 700;
    margin: 1.25rem 0 0.5rem;
    color: var(--color-text);
}

.card-details-body h3 { font-size: 1.1rem; }
.card-details-body h4 { font-size: 1rem; }

.card-details-body ul, .card-details-body ol {
    margin: 0.5rem 0 0.75rem 1.25rem;
    line-height: 1.75;
}

.card-details-body li {
    margin-bottom: 0.25rem;
}

.card-details-body blockquote {
    border-left: 2px solid var(--color-accent);
    padding: 0.5rem 1rem;
    margin: 0.75rem 0;
    font-style: italic;
    color: var(--color-text-muted);
}

/* ===== Category Bar ===== */
.category-bar {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 1rem 1.25rem 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.cat-pill {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 0.4rem 0.85rem;
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    background: transparent;
    transition: all var(--transition);
}

.cat-pill:hover {
    border-color: var(--color-text-muted);
    color: var(--color-text);
}

.cat-pill.active {
    background: var(--color-text);
    color: var(--color-bg);
    border-color: var(--color-text);
}

/* ===== Weekly Article ===== */
.article {
    animation: fadeIn 0.4s ease;
}

.article-header {
    text-align: center;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 1.5rem;
}

.article-title {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

.article-summary {
    font-size: 1.05rem;
    font-style: italic;
    color: var(--color-text-muted);
    line-height: 1.6;
    max-width: 580px;
    margin: 0 auto;
}

.article-body h2 {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 700;
    margin: 2.25rem 0 0.75rem;
    color: var(--color-text);
}

.article-body h3 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 700;
    margin: 1.75rem 0 0.5rem;
    color: var(--color-text);
}

.article-body p {
    margin-bottom: 1rem;
    line-height: 1.85;
    color: var(--color-text-secondary);
}

.article-body ul, .article-body ol {
    margin: 0.75rem 0 1rem 1.5rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
}

.article-body li {
    margin-bottom: 0.375rem;
}

.article-body blockquote {
    border-left: 2px solid var(--color-accent);
    padding: 0.75rem 1.25rem;
    margin: 1.25rem 0;
    font-style: italic;
    color: var(--color-text-muted);
}

.article-body strong {
    font-weight: 600;
    color: var(--color-text);
}

.article-sources {
    margin-top: 2.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--color-border);
}

.article-sources h3 {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

.article-sources ul {
    list-style: none;
}

.article-sources li {
    margin-bottom: 0.5rem;
}

.article-sources a {
    font-size: 0.875rem;
    color: var(--color-link);
    text-decoration: none;
    transition: color var(--transition);
}

.article-sources a:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

/* ===== Empty / Loading States ===== */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    font-style: italic;
}

.loading {
    text-align: center;
    padding: 3rem 1rem;
}

.loading-spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-text-muted);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeSlideUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    50% { transform: translateX(5px); }
    75% { transform: translateX(-3px); }
}

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

/* ===== Responsive ===== */
@media (max-width: 480px) {
    .masthead-title {
        font-size: 2rem;
    }

    .section-tab {
        font-size: 0.7rem;
        padding: 0.65rem 0.25rem;
        letter-spacing: 0.04em;
    }

    .card-headline {
        font-size: 1.15rem;
    }

    .date-label {
        font-size: 0.75rem;
        min-width: 180px;
    }

    .article-title {
        font-size: 1.6rem;
    }

    .category-bar {
        gap: 0.4rem;
    }

    .cat-pill {
        font-size: 0.7rem;
        padding: 0.3rem 0.65rem;
    }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}