/* ═══════════════════════════════════════════════════════════════════════════
   SIGNDEAF — BSL Learning Guide
   Complete style sheet for template-bsl-learning-guide.php
   ═══════════════════════════════════════════════════════════════════════════ */

:root {
    --sdlg-ink:     #0f1b35;
    --sdlg-muted:   #4a6a9b;
    --sdlg-line:    #cdd9f5;
    --sdlg-bg:      #f0f5ff;
    --sdlg-white:   #ffffff;
    --sdlg-blue:    #1971c2;
    --sdlg-cyan:    #1cb0f6;
    --sdlg-gold:    #ffd900;
    --sdlg-dark:    #0f1b35;
    --sdlg-radius:  20px;
    --sdlg-shadow:  0 4px 24px rgba(25,113,194,.1);
    --sdlg-max:     900px;
}

/* ── Base ───────────────────────────────────────────────────────────────── */
.sdlg-page { min-height: 100vh; background: #f8faff; }

.sdlg-container {
    max-width: var(--sdlg-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ── Breadcrumb ─────────────────────────────────────────────────────────── */
.sdlg-breadcrumb {
    background: var(--sdlg-white);
    border-bottom: 1px solid var(--sdlg-line);
    padding: 10px 0;
}
.sdlg-breadcrumb ol {
    list-style: none;
    padding: 0; margin: 0;
    display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
    font-size: 12px; color: var(--sdlg-muted);
}
.sdlg-breadcrumb a { color: var(--sdlg-muted); text-decoration: none; transition: color .15s; }
.sdlg-breadcrumb a:hover { color: var(--sdlg-blue); }
.sdlg-breadcrumb [aria-current="page"] { color: var(--sdlg-ink); font-weight: 600; }
.sdlg-breadcrumb li[aria-hidden="true"] { opacity: .4; }

/* ── Hero ───────────────────────────────────────────────────────────────── */
.sdlg-hero {
    background: linear-gradient(160deg, #1c2f6b 0%, #0f1b35 100%);
    padding: 64px 0 72px;
    position: relative;
    overflow: hidden;
}
.sdlg-hero::before {
    content: '';
    position: absolute; inset: 0; pointer-events: none;
    background:
        radial-gradient(ellipse 70% 50% at 15% 50%, rgba(28,176,246,.12), transparent),
        radial-gradient(ellipse 45% 60% at 85% 25%, rgba(255,217,0,.08), transparent);
}
.sdlg-hero-inner { position: relative; }

.sdlg-hero-kicker {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(255,217,0,.15);
    border: 1px solid rgba(255,217,0,.3);
    border-radius: 999px;
    padding: 6px 16px;
    font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
    color: var(--sdlg-gold);
    margin-bottom: 24px;
}
.sdlg-hero-h1 {
    font-size: clamp(28px, 5vw, 52px);
    font-weight: 900; color: #fff;
    line-height: 1.08; letter-spacing: -.025em;
    margin: 0 0 18px;
}
.sdlg-hero-h1 em { font-style: normal; color: var(--sdlg-gold); }
.sdlg-hero-sub {
    font-size: 17px; color: rgba(255,255,255,.65);
    line-height: 1.65; margin: 0 0 36px;
    max-width: 640px;
}

/* Stats bar */
.sdlg-stats-bar {
    display: flex; gap: 12px; flex-wrap: wrap;
    margin-bottom: 36px;
}
.sdlg-stat {
    background: rgba(255,255,255,.08);
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 16px; padding: 16px 22px; text-align: center; min-width: 100px;
}
.sdlg-stat-num {
    display: block; font-size: 26px; font-weight: 900; color: #fff; line-height: 1; margin-bottom: 4px;
}
.sdlg-stat-label {
    font-size: 11px; color: rgba(255,255,255,.5);
    font-weight: 600; text-transform: uppercase; letter-spacing: .05em;
}

/* Quick nav */
.sdlg-quicknav {
    display: flex; gap: 8px; flex-wrap: wrap;
}
.sdlg-quicknav-link {
    display: inline-block;
    padding: 8px 18px;
    background: rgba(255,255,255,.1);
    border: 1px solid rgba(255,255,255,.18);
    border-radius: 999px;
    font-size: 13px; font-weight: 600; color: rgba(255,255,255,.8);
    text-decoration: none;
    transition: background .15s, color .15s, border-color .15s;
}
.sdlg-quicknav-link:hover {
    background: rgba(255,255,255,.2);
    color: #fff;
    border-color: rgba(255,255,255,.3);
    text-decoration: none;
}

/* ── Section wrappers ───────────────────────────────────────────────────── */
.sdlg-section { padding: 64px 0; }
.sdlg-section--white { background: var(--sdlg-white); }
.sdlg-section--tinted { background: #f0f5ff; }
.sdlg-section--dark {
    background: linear-gradient(160deg, #1c2f6b 0%, #0f1b35 100%);
    color: rgba(255,255,255,.85);
}

.sdlg-section-label {
    font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
    color: var(--sdlg-blue); margin-bottom: 10px;
}
.sdlg-section-label--light { color: rgba(255,217,0,.8); }

.sdlg-section-h2 {
    font-size: clamp(22px, 3.5vw, 34px);
    font-weight: 900; color: var(--sdlg-ink);
    letter-spacing: -.02em; margin: 0 0 14px; line-height: 1.1;
}
.sdlg-h2--light { color: #fff; }

.sdlg-section-lead {
    font-size: 16px; color: var(--sdlg-muted);
    line-height: 1.7; margin: 0 0 40px; max-width: 700px;
}
.sdlg-lead--light { color: rgba(255,255,255,.65); }

/* ── Progress note ──────────────────────────────────────────────────────── */
.sdlg-progress-note {
    display: flex; align-items: center; gap: 12px;
    background: linear-gradient(135deg, #f0fdf4, #dcfce7);
    border: 1px solid #86efac; border-radius: 14px;
    padding: 14px 18px;
    font-size: 14px; color: #15803d;
    margin-bottom: 32px;
}

/* ── CEFR Roadmap ───────────────────────────────────────────────────────── */
.sdlg-roadmap {
    display: flex; flex-direction: column; gap: 20px;
}
.sdlg-level-card {
    background: var(--lv-bg, #f8faff);
    border: 2px solid var(--lv-border, #cdd9f5);
    border-radius: var(--sdlg-radius);
    padding: 28px;
    transition: box-shadow .2s, transform .2s;
}
.sdlg-level-card:hover {
    box-shadow: 0 8px 32px rgba(25,113,194,.12);
    transform: translateY(-2px);
}
.sdlg-level-head {
    display: flex; align-items: flex-start;
    justify-content: space-between; gap: 16px;
    margin-bottom: 14px; flex-wrap: wrap;
}
.sdlg-level-badge {
    display: flex; align-items: center; gap: 12px;
}
.sdlg-level-badge-icon { font-size: 32px; line-height: 1; flex-shrink: 0; }
.sdlg-level-code {
    display: block;
    font-size: 22px; font-weight: 900;
    color: var(--lv-color); line-height: 1;
}
.sdlg-level-name {
    display: block;
    font-size: 13px; font-weight: 600;
    color: var(--sdlg-muted); margin-top: 2px;
}
.sdlg-level-meta {
    display: flex; gap: 8px; flex-wrap: wrap; align-items: center;
}
.sdlg-level-meta-pill {
    display: inline-flex; align-items: center; gap: 5px;
    background: rgba(255,255,255,.7);
    border: 1px solid var(--sdlg-line);
    border-radius: 999px; padding: 4px 12px;
    font-size: 12px; font-weight: 600; color: var(--sdlg-muted);
    white-space: nowrap;
}
.sdlg-level-goal {
    font-size: 15px; color: var(--sdlg-ink); line-height: 1.6;
    margin: 0 0 18px;
    padding-bottom: 18px; border-bottom: 1px solid var(--lv-border, #cdd9f5);
}
.sdlg-level-cats { margin-bottom: 16px; }
.sdlg-level-cats-label {
    font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .07em;
    color: var(--sdlg-muted); margin-bottom: 8px;
}
.sdlg-level-cats-list {
    list-style: none; padding: 0; margin: 0;
    display: flex; flex-wrap: wrap; gap: 6px;
}
.sdlg-level-cats-list li {
    background: rgba(255,255,255,.8);
    border: 1px solid var(--lv-border, #cdd9f5);
    border-radius: 8px; padding: 4px 10px;
    font-size: 12px; color: var(--sdlg-ink); font-weight: 500;
}
.sdlg-level-tip {
    display: flex; align-items: flex-start; gap: 8px;
    background: rgba(255,255,255,.6);
    border-left: 3px solid var(--lv-color);
    border-radius: 0 10px 10px 0;
    padding: 10px 14px;
    font-size: 13px; color: var(--sdlg-muted);
    line-height: 1.5; margin-bottom: 20px;
}
.sdlg-level-tip svg { flex-shrink: 0; margin-top: 2px; stroke: var(--lv-color); }
.sdlg-level-actions { display: flex; gap: 10px; flex-wrap: wrap; }

.sdlg-level-btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 10px 20px; border-radius: 999px;
    font-size: 13px; font-weight: 700;
    text-decoration: none; transition: transform .15s, box-shadow .15s;
}
.sdlg-level-btn:hover { transform: translateY(-2px); text-decoration: none; }
.sdlg-level-btn--dict {
    background: var(--sdlg-white);
    border: 2px solid var(--lv-color);
    color: var(--lv-color);
}
.sdlg-level-btn--dict:hover {
    background: var(--lv-bg);
    color: var(--lv-color);
}
.sdlg-level-btn--practice {
    background: var(--lv-color);
    color: #fff;
    box-shadow: 0 4px 14px rgba(25,113,194,.25);
}
.sdlg-level-btn--practice:hover { color: #fff; }
.sdlg-level-btn--lock {
    background: var(--sdlg-white);
    border: 2px solid var(--sdlg-line);
    color: var(--sdlg-muted);
}

/* ── Grammar cards ──────────────────────────────────────────────────────── */
.sdlg-grammar-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}
.sdlg-grammar-card {
    background: var(--sdlg-white);
    border: 1px solid var(--sdlg-line);
    border-radius: var(--sdlg-radius); padding: 28px;
    position: relative;
}
.sdlg-grammar-num {
    position: absolute; top: 24px; right: 24px;
    font-size: 40px; font-weight: 900;
    color: rgba(25,113,194,.07);
    line-height: 1; user-select: none;
}
.sdlg-grammar-h3 {
    font-size: 16px; font-weight: 800; color: var(--sdlg-ink);
    margin: 0 0 12px; line-height: 1.3; padding-right: 48px;
}
.sdlg-grammar-card p, .sdlg-grammar-card ul {
    font-size: 14px; color: var(--sdlg-muted); line-height: 1.7;
    margin: 0 0 12px;
}
.sdlg-grammar-card p:last-child, .sdlg-grammar-card ul:last-child { margin-bottom: 0; }
.sdlg-grammar-card ul { padding-left: 18px; }
.sdlg-grammar-card li { margin-bottom: 6px; }
.sdlg-grammar-example {
    background: #f0f5ff;
    border-left: 3px solid var(--sdlg-blue);
    border-radius: 0 12px 12px 0;
    padding: 12px 14px;
    font-size: 13px; color: var(--sdlg-muted);
    margin-top: 14px; line-height: 1.5;
}
.sdlg-ex-label {
    display: block;
    font-size: 10px; font-weight: 700; text-transform: uppercase;
    letter-spacing: .08em; color: var(--sdlg-blue); margin-bottom: 4px;
}
.sdlg-grammar-note {
    display: flex; align-items: flex-start; gap: 12px;
    background: linear-gradient(135deg, #fffbeb, #fef9e7);
    border: 1px solid #fcd34d; border-radius: 14px;
    padding: 18px 20px;
    font-size: 14px; color: #78350f; line-height: 1.6;
}
.sdlg-grammar-note svg { stroke: #b45309; flex-shrink: 0; margin-top: 2px; }

/* ── Fingerspelling ──────────────────────────────────────────────────────── */
.sdlg-fs-tips-row {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px; margin-bottom: 36px;
}
.sdlg-fs-tip {
    display: flex; align-items: flex-start; gap: 14px;
    background: #f0f5ff; border: 1px solid var(--sdlg-line);
    border-radius: 16px; padding: 18px;
}
.sdlg-fs-tip-icon { font-size: 24px; flex-shrink: 0; line-height: 1; margin-top: 2px; }
.sdlg-fs-tip strong { display: block; font-size: 13px; font-weight: 700; color: var(--sdlg-ink); margin-bottom: 4px; }
.sdlg-fs-tip div { font-size: 13px; color: var(--sdlg-muted); line-height: 1.55; }

.sdlg-alphabet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 10px;
    margin-bottom: 48px;
}
.sdlg-alpha-card {
    background: var(--sdlg-white);
    border: 1px solid var(--sdlg-line);
    border-radius: 14px; padding: 16px;
    text-align: center;
    transition: box-shadow .15s, transform .15s;
}
.sdlg-alpha-card:hover {
    box-shadow: 0 6px 20px rgba(25,113,194,.12);
    transform: translateY(-2px);
}
.sdlg-alpha-letter {
    font-size: 42px; font-weight: 900; color: var(--sdlg-blue);
    line-height: 1; margin-bottom: 10px;
    font-family: Georgia, serif;
}
.sdlg-alpha-desc {
    font-size: 11px; color: var(--sdlg-muted);
    line-height: 1.5; margin: 0; text-align: left;
}

.sdlg-fs-numbers { border-top: 1px solid var(--sdlg-line); padding-top: 40px; }
.sdlg-fs-numbers-h3 {
    font-size: 20px; font-weight: 800; color: var(--sdlg-ink);
    margin: 0 0 8px;
}
.sdlg-fs-numbers-note {
    font-size: 14px; color: var(--sdlg-muted); margin: 0 0 24px; line-height: 1.6;
}
.sdlg-numbers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 10px;
}
.sdlg-num-card {
    background: var(--sdlg-white);
    border: 1px solid var(--sdlg-line);
    border-radius: 14px; padding: 16px; text-align: center;
}
.sdlg-num-digit {
    font-size: 36px; font-weight: 900; color: var(--sdlg-blue);
    line-height: 1; margin-bottom: 8px;
}
.sdlg-num-desc {
    font-size: 11px; color: var(--sdlg-muted);
    line-height: 1.5; margin: 0; text-align: left;
}

/* ── Phrases ────────────────────────────────────────────────────────────── */
.sdlg-phrases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}
.sdlg-phrase-group {
    background: var(--sdlg-white);
    border: 1px solid var(--sdlg-line);
    border-radius: var(--sdlg-radius); overflow: hidden;
}
.sdlg-phrase-group-header {
    display: flex; align-items: center; gap: 12px;
    background: #f0f5ff; padding: 16px 20px;
    border-bottom: 1px solid var(--sdlg-line);
}
.sdlg-phrase-group-icon { font-size: 22px; flex-shrink: 0; }
.sdlg-phrase-group-header h3 {
    font-size: 15px; font-weight: 800; color: var(--sdlg-ink); margin: 0;
}
.sdlg-phrase-list {
    list-style: none; padding: 0; margin: 0;
}
.sdlg-phrase-list li {
    padding: 10px 20px;
    border-bottom: 1px solid #f0f5ff;
    font-size: 13px; color: var(--sdlg-muted); line-height: 1.55;
}
.sdlg-phrase-list li:last-child { border-bottom: none; }
.sdlg-sign-name {
    display: inline-block;
    background: #e0ebff;
    border-radius: 5px; padding: 1px 7px;
    font-size: 11px; font-weight: 700; font-family: monospace;
    color: var(--sdlg-blue); letter-spacing: .04em;
    margin-right: 4px; vertical-align: baseline;
}
.sdlg-phrases-note {
    font-size: 13px; color: var(--sdlg-muted); line-height: 1.6;
    background: #f8faff; border: 1px solid var(--sdlg-line);
    border-radius: 12px; padding: 14px 18px;
}
.sdlg-phrases-note a { color: var(--sdlg-blue); text-decoration: none; font-weight: 600; }
.sdlg-phrases-note a:hover { text-decoration: underline; }

/* ── Study Science ──────────────────────────────────────────────────────── */
.sdlg-study-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
}
.sdlg-study-card {
    background: #f8faff;
    border: 1px solid var(--sdlg-line);
    border-radius: var(--sdlg-radius); padding: 28px;
}
.sdlg-study-card--feature {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, #f0f5ff, #e8f2ff);
    border-color: #93c5fd;
}
.sdlg-study-card-icon { font-size: 32px; margin-bottom: 14px; display: block; line-height: 1; }
.sdlg-study-card h3 {
    font-size: 16px; font-weight: 800; color: var(--sdlg-ink);
    margin: 0 0 12px;
}
.sdlg-study-card p {
    font-size: 14px; color: var(--sdlg-muted); line-height: 1.7; margin: 0 0 12px;
}
.sdlg-study-card p:last-child { margin-bottom: 0; }
.sdlg-study-highlight {
    background: linear-gradient(135deg, #1971c2, #1cb0f6);
    color: #fff;
    border-radius: 12px; padding: 14px 16px;
    font-size: 14px; font-weight: 600; line-height: 1.5;
    margin-top: 14px;
}
.sdlg-study-routine {
    list-style: none; padding: 0; margin: 0;
    display: flex; flex-direction: column; gap: 8px;
}
.sdlg-study-routine li {
    font-size: 13px; color: var(--sdlg-muted); line-height: 1.55;
    padding: 10px 14px;
    background: rgba(255,255,255,.8);
    border-radius: 10px;
    border-left: 3px solid var(--sdlg-blue);
}

/* ── Deaf Culture ───────────────────────────────────────────────────────── */
.sdlg-culture-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}
.sdlg-culture-card {
    background: rgba(255,255,255,.08);
    border: 1px solid rgba(255,255,255,.12);
    border-radius: var(--sdlg-radius); padding: 28px;
}
.sdlg-culture-card h3 {
    font-size: 16px; font-weight: 800; color: #fff;
    margin: 0 0 12px;
}
.sdlg-culture-card p {
    font-size: 14px; color: rgba(255,255,255,.65);
    line-height: 1.7; margin: 0 0 10px;
}
.sdlg-culture-card p:last-child { margin-bottom: 0; }
.sdlg-etiquette-list {
    list-style: none; padding: 0; margin: 0;
    display: flex; flex-direction: column; gap: 8px;
}
.sdlg-etiquette-list li {
    font-size: 13px; color: rgba(255,255,255,.65); line-height: 1.55;
    padding-left: 16px; position: relative;
}
.sdlg-etiquette-list li::before {
    content: '→';
    position: absolute; left: 0;
    color: var(--sdlg-gold); font-weight: 700;
}
.sdlg-culture-quote {
    border-top: 1px solid rgba(255,255,255,.12);
    padding-top: 32px;
}
.sdlg-culture-quote blockquote {
    margin: 0; max-width: 640px;
}
.sdlg-culture-quote p {
    font-size: 18px; font-style: italic; color: rgba(255,255,255,.8);
    line-height: 1.6; margin: 0 0 12px;
}
.sdlg-culture-quote cite {
    font-size: 13px; color: rgba(255,255,255,.45); font-style: normal;
}

/* ── Resources ──────────────────────────────────────────────────────────── */
.sdlg-resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}
.sdlg-resource-group h3 {
    font-size: 15px; font-weight: 800; color: var(--sdlg-ink);
    margin: 0 0 16px; padding-bottom: 10px;
    border-bottom: 2px solid var(--sdlg-blue);
    display: inline-block;
}
.sdlg-resource-list {
    list-style: none; padding: 0; margin: 0;
    display: flex; flex-direction: column; gap: 14px;
}
.sdlg-resource-list li {
    font-size: 13px; color: var(--sdlg-muted); line-height: 1.6;
    padding-left: 16px; position: relative;
}
.sdlg-resource-list li::before {
    content: '';
    position: absolute; left: 0; top: 8px;
    width: 6px; height: 6px;
    background: var(--sdlg-blue); border-radius: 50%;
}
.sdlg-resource-list strong { color: var(--sdlg-ink); }
.sdlg-resource-list a { color: var(--sdlg-blue); text-decoration: none; font-weight: 600; }
.sdlg-resource-list a:hover { text-decoration: underline; }

/* ── FAQ ────────────────────────────────────────────────────────────────── */
.sdlg-faq-container { max-width: 720px; }
.sdlg-faq {
    display: flex; flex-direction: column; gap: 0;
}
.sdlg-faq-item {
    border-top: 1px solid var(--sdlg-line);
    padding: 22px 0;
}
.sdlg-faq-item:last-child { border-bottom: 1px solid var(--sdlg-line); }
.sdlg-faq dt {
    font-size: 16px; font-weight: 800; color: var(--sdlg-ink);
    margin: 0 0 8px; line-height: 1.3;
}
.sdlg-faq dd {
    font-size: 14px; color: var(--sdlg-muted);
    line-height: 1.7; margin: 0;
}

/* ── Bottom CTA ─────────────────────────────────────────────────────────── */
.sdlg-cta-section {
    background: linear-gradient(160deg, #1c2f6b 0%, #0f1b35 100%);
    padding: 72px 0;
    position: relative; overflow: hidden;
}
.sdlg-cta-section::before {
    content: ''; position: absolute; inset: 0; pointer-events: none;
    background: radial-gradient(ellipse 60% 80% at 80% 50%, rgba(28,176,246,.1), transparent);
}
.sdlg-cta-inner {
    position: relative;
    display: flex; align-items: center;
    gap: 48px; flex-wrap: wrap;
}
.sdlg-cta-text { flex: 1; min-width: 280px; }
.sdlg-cta-kicker { font-size: 42px; display: block; margin-bottom: 16px; line-height: 1; }
.sdlg-cta-h2 {
    font-size: clamp(22px, 3.5vw, 34px);
    font-weight: 900; color: #fff;
    line-height: 1.15; margin: 0 0 12px; letter-spacing: -.02em;
}
.sdlg-cta-sub {
    font-size: 16px; color: rgba(255,255,255,.6); margin: 0; line-height: 1.65;
}
.sdlg-cta-buttons {
    display: flex; flex-direction: column; gap: 12px;
    min-width: 220px;
}
.sdlg-cta-btn {
    display: inline-flex; align-items: center; gap: 8px; justify-content: center;
    padding: 16px 28px; border-radius: 999px;
    font-size: 15px; font-weight: 700; text-decoration: none;
    transition: transform .15s, box-shadow .15s;
}
.sdlg-cta-btn:hover { transform: translateY(-2px); text-decoration: none; }
.sdlg-cta-btn--primary {
    background: linear-gradient(135deg, #1971c2, #1cb0f6);
    color: #fff;
    box-shadow: 0 6px 24px rgba(25,113,194,.45);
}
.sdlg-cta-btn--primary:hover { color: #fff; box-shadow: 0 10px 32px rgba(25,113,194,.55); }
.sdlg-cta-btn--secondary {
    background: rgba(255,255,255,.1);
    border: 1px solid rgba(255,255,255,.2);
    color: rgba(255,255,255,.85);
}
.sdlg-cta-btn--secondary:hover { background: rgba(255,255,255,.18); color: #fff; }
.sdlg-cta-btn--outline {
    background: transparent;
    border: 2px solid rgba(255,255,255,.2);
    color: rgba(255,255,255,.55);
    font-size: 13px; padding: 12px 24px;
}
.sdlg-cta-btn--outline:hover { border-color: rgba(255,255,255,.4); color: rgba(255,255,255,.75); }

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 700px) {
    .sdlg-hero { padding: 48px 0 56px; }
    .sdlg-hero-h1 { font-size: 30px; }
    .sdlg-section { padding: 48px 0; }

    .sdlg-stats-bar { gap: 8px; }
    .sdlg-stat { padding: 12px 14px; min-width: 80px; }
    .sdlg-stat-num { font-size: 20px; }

    .sdlg-quicknav { gap: 6px; }
    .sdlg-quicknav-link { font-size: 11px; padding: 6px 12px; }

    .sdlg-grammar-grid { grid-template-columns: 1fr; }
    .sdlg-alphabet-grid { grid-template-columns: repeat(3, 1fr); }
    .sdlg-phrases-grid { grid-template-columns: 1fr; }
    .sdlg-study-grid { grid-template-columns: 1fr; }
    .sdlg-culture-grid { grid-template-columns: 1fr; }
    .sdlg-resources-grid { grid-template-columns: 1fr; }

    .sdlg-level-head { flex-direction: column; gap: 10px; }
    .sdlg-level-card { padding: 20px; }

    .sdlg-cta-inner { flex-direction: column; gap: 32px; text-align: center; }
    .sdlg-cta-buttons { width: 100%; }
    .sdlg-cta-btn { width: 100%; }
}

@media (max-width: 400px) {
    .sdlg-alphabet-grid { grid-template-columns: repeat(2, 1fr); }
}