/* Static styles for course.html — dynamic :root variables remain in the template */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; background: var(--color-bg); font-family: var(--font-sans); }
body { display: block; padding: 40px 15px 0; }
@media (max-width: 768px) { body { padding: 15px 12px !important; } }

.faq-container { width: 100%; max-width: min(900px, calc(100vw - 30px)); margin: 0 auto; }
h1 { font-size: 28px; font-weight: 700; color: var(--color-text-primary); text-align: center; margin-bottom: 8px; letter-spacing: -0.02em; }
.faq-subtitle { text-align: center; color: var(--color-text-muted); font-size: 14px; margin-bottom: 32px; line-height: 1.5; }
.back-link { display: inline-block; color: #59636E; text-decoration: none; font-size: 13px; margin-bottom: 24px; }
.back-link:hover { color: #1F2328; }

.course-progress { background: var(--color-bg-secondary); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 16px 20px; margin-bottom: 24px; display: flex; align-items: center; gap: 14px; }
.course-progress .cp-label { font-size: 13px; font-weight: 600; color: var(--color-text-muted); white-space: nowrap; }
.course-progress .cp-bar { flex: 1; height: 8px; background: var(--color-border); border-radius: 4px; overflow: hidden; }
.course-progress .cp-fill { height: 100%; background: var(--color-accent); border-radius: 4px; transition: width 0.4s ease; width: 0%; }
.course-progress .cp-pct { font-size: 14px; font-weight: 700; color: var(--color-accent); min-width: 40px; text-align: right; }

.module-header { font-size: 15px; font-weight: 700; color: #374151; margin: 28px 0 12px; padding: 8px 16px; background: #F6F8FA; border-radius: var(--radius-sm); border: 1px solid var(--color-border); }
.module-header:first-of-type { margin-top: 0; }

.faq-item { border: 1px solid var(--color-border); border-radius: 6px; margin-bottom: 10px; overflow: hidden; background: white; transition: border-color var(--transition-fast); }
.faq-item.completed { border-left: 3px solid var(--color-success); }
.faq-item.active { border-color: #374151; box-shadow: var(--shadow-sm); }
.faq-item.test-item { border-left: 3px solid #d4a72c; }
.faq-item.test-item.active { border-color: #d4a72c; }
.faq-item.locked { opacity: 0.5; }
.faq-item.locked .faq-question { cursor: not-allowed; }

.faq-question { padding: 14px 20px; font-size: 14px; font-weight: 600; color: var(--color-text-primary); cursor: pointer; display: flex; justify-content: space-between; align-items: center; transition: background var(--transition-fast); gap: 12px; }
.faq-question:hover { background: var(--color-bg-secondary); }
.faq-question .q-left { display: flex; align-items: center; gap: 12px; min-width: 0; flex: 1; }
.faq-question .q-icon { width: 26px; height: 26px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 600; flex-shrink: 0; background: var(--color-border); color: var(--color-text-muted); }
.faq-item.active .q-icon { background: var(--color-accent); color: #fff; }
.faq-item.completed .q-icon { background: var(--color-success); color: #fff; }
.faq-item.test-item .q-icon { background: #d4a72c; color: #fff; }
.faq-item.completed.test-item .q-icon { background: var(--color-success); color: #fff; }
.faq-question .q-label { flex: 1; min-width: 0; }
.faq-question .q-label .q-num { font-size: 10px; color: var(--color-text-muted); font-weight: 400; display: block; }
.faq-question::after { content: '+'; font-size: 20px; font-weight: 400; color: var(--color-text-muted); flex-shrink: 0; margin-left: 4px; }
.faq-item.open .faq-question::after { content: '\2013'; }

.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-item.open .faq-answer { max-height: 3000px; }
.faq-answer-inner { padding: 0 20px 16px; font-size: 14px; color: var(--color-text-secondary); line-height: 1.7; }
.faq-answer-inner p { margin-bottom: 10px; }
.faq-answer-inner strong { color: var(--color-text-primary); }
.faq-answer-inner code { background: var(--color-bg-secondary); border: 1px solid var(--color-border); border-radius: 4px; padding: 1px 6px; font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace; font-size: 12px; color: var(--color-text-primary); }
.faq-answer-inner ul, .faq-answer-inner ol { padding-left: 20px; margin-bottom: 10px; }
.faq-answer-inner li { margin-bottom: 5px; }
.faq-answer-inner .highlight-box { background: var(--color-bg-secondary); border-left: 3px solid #374151; padding: 10px 14px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 10px 0; font-size: 13px; }
.faq-answer-inner .tip-box { background: #fff8e5; border-left: 3px solid #d4a72c; padding: 10px 14px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 10px 0; font-size: 13px; }

.question-block { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--color-border); }
.question-text { font-size: 14px; font-weight: 600; margin-bottom: 12px; color: var(--color-text-primary); }
.options-list { display: flex; flex-direction: column; gap: 6px; }

.option-btn { display: flex; align-items: center; gap: 10px; padding: 10px 14px; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; cursor: pointer; font-size: 13px; color: var(--color-text-secondary); transition: all var(--transition-fast); text-align: left; font-family: inherit; }
.option-btn:hover { border-color: #374151; background: #F6F8FA; }
.option-btn .opt-letter { width: 24px; height: 24px; border-radius: 50%; background: var(--color-bg-secondary); display: flex; align-items: center; justify-content: center; font-size: 11px; font-weight: 600; color: var(--color-text-muted); flex-shrink: 0; transition: all var(--transition-fast); }
.option-btn:hover .opt-letter { background: #374151; color: #fff; }
.option-btn.selected { border-color: #374151; background: #F0F2F5; }
.option-btn.selected .opt-letter { background: var(--color-accent); color: #fff; }
.option-btn.correct { border-color: var(--color-success); background: var(--color-success-bg); }
.option-btn.correct .opt-letter { background: var(--color-success); color: #fff; }
.option-btn.incorrect { border-color: var(--color-error); background: var(--color-error-bg); }
.option-btn.incorrect .opt-letter { background: var(--color-error); color: #fff; }
.option-btn.disabled { cursor: default; opacity: 0.8; }

.feedback-block { margin-top: 12px; padding: 10px 14px; border-radius: var(--radius-md); font-size: 13px; line-height: 1.5; display: none; }
.feedback-block.show { display: block; }
.feedback-block.correct { background: var(--color-success-bg); border: 1px solid var(--color-success); color: #1a3d1a; }
.feedback-block.incorrect { background: var(--color-error-bg); border: 1px solid var(--color-error); color: #5c1a1a; }

.nav-buttons { display: flex; justify-content: space-between; margin-top: 14px; gap: 10px; flex-wrap: wrap; }
.btn { padding: 8px 18px; border-radius: var(--radius-sm); font-size: 13px; font-weight: 500; cursor: pointer; transition: all var(--transition-fast); border: 1px solid var(--color-border); background: #fff; color: var(--color-text-secondary); font-family: inherit; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; }
.btn:hover { background: var(--color-bg-secondary); border-color: var(--color-text-muted); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: #374151; color: #fff; border-color: #374151; }
.btn-primary:hover { background: #4B5563; border-color: #4B5563; }
.btn-success { background: var(--color-success); color: #fff; border-color: var(--color-success); }
.btn-success:hover { opacity: 0.9; }

.test-result { text-align: center; padding: 24px 16px; }
.test-result .tr-score { font-size: 48px; font-weight: 800; color: var(--color-accent); margin-bottom: 8px; }
.test-result .tr-label { font-size: 18px; font-weight: 600; margin-bottom: 4px; }
.test-result .tr-detail { font-size: 13px; color: var(--color-text-muted); margin-bottom: 16px; }
.test-result .tr-grade { display: inline-block; padding: 4px 16px; border-radius: 20px; font-size: 13px; font-weight: 600; margin-bottom: 16px; }
.test-result .tr-grade.excellent { background: var(--color-success-bg); color: var(--color-success); }
.test-result .tr-grade.good { background: #ddf4ff; color: #0969da; }
.test-result .tr-grade.average { background: #fff8e5; color: #9a7b1a; }
.test-result .tr-grade.poor { background: var(--color-error-bg); color: var(--color-error); }

.generating-card { text-align: center; padding: 48px 24px; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: white; }
.gen-spinner { width: 40px; height: 40px; border: 4px solid var(--color-border); border-top-color: var(--color-accent); border-radius: 50%; animation: spin 0.8s linear infinite; margin: 0 auto 16px; }
@keyframes spin { to { transform: rotate(360deg); } }
.gen-spinner + h3 { font-size: 18px; margin-bottom: 8px; }
.gen-spinner + h3 + p { font-size: 13px; color: var(--color-text-muted); }
.gen-progress-bar { width: 100%; max-width: 320px; height: 4px; background: var(--color-border); border-radius: 2px; margin: 16px auto 0; overflow: hidden; }
.gen-progress-fill { height: 100%; background: var(--color-accent); border-radius: 2px; animation: progressPulse 1.8s ease-in-out infinite; width: 30%; }
@keyframes progressPulse { 0% { width: 10%; } 50% { width: 60%; } 100% { width: 10%; } }

.welcome-card { text-align: center; padding: 40px 24px; }
.welcome-card h1 { font-size: 26px; margin-bottom: 12px; }
.welcome-card p { font-size: 14px; color: var(--color-text-secondary); line-height: 1.7; max-width: 520px; margin: 0 auto 20px; }
.welcome-features { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin: 20px 0; }
.welcome-feature { background: var(--color-bg-secondary); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 10px 16px; font-size: 13px; color: var(--color-text-secondary); display: flex; align-items: center; gap: 8px; }
.welcome-feature span { font-size: 16px; }

.completion-card { text-align: center; padding: 40px 24px; }
.completion-card .big-icon { font-size: 56px; margin-bottom: 12px; }
.completion-card h2 { font-size: 22px; font-weight: 700; margin-bottom: 8px; }
.completion-card p { color: var(--color-text-secondary); font-size: 14px; margin-bottom: 6px; }
.completion-stats { display: flex; gap: 20px; justify-content: center; margin: 20px 0; }
.completion-stat { text-align: center; }
.completion-stat .num { font-size: 28px; font-weight: 800; color: var(--color-accent); }
.completion-stat .label { font-size: 11px; color: var(--color-text-muted); }

.gen-next-cta { text-align: center; margin: 24px 0; padding: 20px; border: 2px dashed var(--color-border); border-radius: var(--radius-md); background: var(--color-bg-secondary); }
.gen-next-cta p { font-size: 13px; color: var(--color-text-muted); margin-bottom: 12px; }

.auth-required { text-align: center; padding: 40px 24px; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: white; }
.auth-required .auth-icon { font-size: 40px; margin-bottom: 12px; }
.auth-required h3 { font-size: 18px; margin-bottom: 8px; }
.auth-required p { font-size: 13px; color: var(--color-text-muted); max-width: 400px; margin: 0 auto 16px; }

.error-card { text-align: center; padding: 40px 24px; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: white; }
.error-card .err-icon { font-size: 40px; margin-bottom: 12px; }
.error-card h3 { font-size: 18px; margin-bottom: 8px; }
.error-card p { font-size: 13px; color: var(--color-text-muted); margin-bottom: 16px; }

.test-nav { display: flex; justify-content: center; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.reset-btn { display: block; margin: 32px auto 0; padding: 6px 14px; font-size: 11px; color: var(--color-text-muted); background: rgba(255,255,255,0.92); border: 1px solid var(--color-border); border-radius: var(--radius-sm); cursor: pointer; transition: all var(--transition-fast); font-family: inherit; }
.reset-btn:hover { color: #374151; border-color: #374151; }

.footer-links { text-align: center; margin-top: 100px; padding-top: 24px; padding-bottom: 24px; color: #6C727F; font-size: 13px; }
.footer-links a { color: #59636E; text-decoration: none; margin-right: 16px; }
.footer-links a:hover { color: #1F2328; }
@media (max-width: 600px) {
    .footer-links a { display: inline-block; margin: 0 8px 8px; }
}

.paid-badge {
    display: inline-block;
    font-size: 10px;
    font-weight: 600;
    color: #FFFFFF;
    background: #E67E22;
    border-radius: 4px;
    padding: 1px 6px;
    margin-left: 6px;
    vertical-align: middle;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.paywall {
    text-align: center;
    padding: 60px 24px;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-secondary);
    margin-bottom: 24px;
}
.paywall-icon { font-size: 48px; margin-bottom: 16px; }
.paywall-title { font-size: 22px; font-weight: 700; margin-bottom: 12px; color: var(--color-text-primary); }
.paywall-desc { font-size: 14px; color: var(--color-text-secondary); line-height: 1.6; max-width: 480px; margin: 0 auto 20px; }
.paywall-price { font-size: 36px; font-weight: 800; color: #374151; margin-bottom: 20px; }
.paywall-btn {
    display: inline-block;
    padding: 12px 32px;
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    background: #374151;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
    font-family: inherit;
}
.paywall-btn:hover { background: #4B5563; }
.paywall-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.paywall-hint { font-size: 12px; color: var(--color-text-muted); margin-top: 12px; }

/* AI Course Assistant (minimal inline) */
.course-ai-section {
    margin: 32px 0 16px;
    border: 1px solid #E8ECEF;
    border-radius: 10px;
    overflow: hidden;
    background: #fff;
}
.course-ai-header {
    padding: 10px 14px;
    background: #F8F9FA;
    border-bottom: 1px solid #E8ECEF;
    font-size: 13px;
    font-weight: 600;
    color: #1F2328;
    display: flex;
    align-items: center;
    gap: 6px;
}
.course-ai-header .ai-clear-btn {
    margin-left: auto;
    background: none;
    border: none;
    padding: 4px 6px;
    font-size: 11px;
    color: #8C959F;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 3px;
    border-radius: 4px;
    font-family: inherit;
}
.course-ai-header .ai-clear-btn:hover {
    color: #1F2328;
    background: #E8ECEF;
}
.course-ai-body {
    padding: 10px 14px;
    max-height: 340px;
    overflow-y: auto;
    background: #fff;
}
.course-ai-body .message {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding-bottom: 12px;
    margin-bottom: 12px;
    border-bottom: 1px solid #F6F8FA;
}
.course-ai-body .message:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: none; }
.course-ai-body .message.user {
    flex-direction: row-reverse;
}
.course-ai-body .message-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: #F6F8FA;
    border: 2px solid #E8ECEF;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: #8C959F;
    overflow: hidden;
}
.course-ai-body .message-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    image-rendering: auto;
}
.course-ai-body .message-content {
    flex: 1;
    min-width: 0;
}
.course-ai-body .message-text {
    font-size: 14px;
    line-height: 1.7;
    color: var(--color-text-secondary);
    padding: 8px 12px;
    border-radius: 8px;
    word-wrap: break-word;
    width: 100%;
    box-sizing: border-box;
}
.course-ai-body .message.user .message-text {
    background: transparent;
}
.course-ai-body .message.ai .message-text {
    background: transparent;
}
.course-ai-body .message-text p { margin: 0 0 10px; }
.course-ai-body .message-text p:last-child { margin-bottom: 0; }
.course-ai-body .message-text p:empty { display: none; margin: 0; }
.course-ai-body .message-text code {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 12px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    color: var(--color-text-primary);
}
.course-ai-body .message-text pre {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 10px;
    overflow-x: auto;
    margin: 6px 0;
}
.course-ai-body .message-text pre code { background: none; padding: 0; border: none; }
.course-ai-body .message-text ul, .course-ai-body .message-text ol {
    margin: 3px 0 10px 0;
    padding-left: 20px;
}
.course-ai-body .message-text li {
    margin-bottom: 5px;
    line-height: 1.7;
}
.course-ai-body .message-text a {
    color: #068487;
    text-decoration: underline;
}
.course-ai-body .message-text strong {
    font-weight: 600;
    color: var(--color-text-primary);
}
.course-ai-body .message-text h1,
.course-ai-body .message-text h2,
.course-ai-body .message-text h3,
.course-ai-body .message-text h4,
.course-ai-body .message-text h5 {
    font-size: 1em;
    font-weight: 600;
    margin: 4px 0 2px 0;
    color: var(--color-text-primary);
}
.course-ai-body .message-text blockquote {
    border-left: 3px solid #068487;
    margin: 6px 0;
    padding: 2px 10px;
    color: var(--color-text-muted);
    font-style: italic;
}
.course-ai-body .message-text hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 8px 0;
}
.course-ai-body .message-text img {
    max-width: 100%;
    border-radius: 8px;
    margin: 8px 0;
    display: block;
}
.course-ai-body .message.ai .ai-thinking {
    color: #8C959F;
    font-style: italic;
    font-size: 12px;
}
.course-ai-footer {
    padding: 10px 12px;
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: 8px;
    align-items: center;
    background: #fff;
}
.course-ai-footer input {
    flex: 1;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: 8px 14px;
    font-size: 14px;
    font-weight: 400;
    color: var(--color-text-primary);
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition-fast);
    background: var(--color-bg-secondary);
}
.course-ai-footer input:focus {
    border-color: var(--color-accent, #374151);
    background: #fff;
}
.course-ai-footer .ai-send {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: var(--color-accent, #374151);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background var(--transition-fast), transform var(--transition-fast);
}
.course-ai-footer .ai-send:hover { transform: scale(1.06); }
.course-ai-footer .ai-send:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.course-ai-footer .ai-voice {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: #fff;
    color: #374151;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}
.course-ai-footer .ai-voice:hover { border-color: var(--color-accent, #374151); background: var(--color-bg-secondary); }
.course-ai-footer .ai-voice.recording {
    background: #fee2e2;
    border-color: #ef4444;
    color: #ef4444;
    animation: pulse 1s infinite;
}
.course-ai-footer .ai-voice.hidden { display: none; }
.course-ai-error {
    padding: 8px 12px;
    background: var(--color-error-bg);
    color: var(--color-error);
    font-size: 12px;
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    display: none;
}
.course-ai-error.show { display: block; }