/* ============================================
   Sola-AI Academy — 강의안 전용 스타일
   A4 인쇄 최적화 + 반응형
   ============================================ */

:root {
    --lec-primary: #1a1a2e;
    --lec-accent: #c9a96e;
    --lec-accent-light: #e4d5b7;
    --lec-accent-dark: #a07c3e;
    --lec-text: #2c2c2c;
    --lec-text-light: #6b6b6b;
    --lec-bg: #faf9f6;
    --lec-bg-warm: #f5f0e8;
    --lec-border: #e8e2d6;
    --lec-white: #ffffff;
    --lec-font-serif: 'Noto Serif KR', Georgia, serif;
    --lec-font-sans: 'Noto Sans KR', -apple-system, sans-serif;
}

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

body {
    font-family: var(--lec-font-sans);
    color: var(--lec-text);
    background: var(--lec-bg);
    line-height: 1.8;
    font-size: 15px;
}

/* Auth Loading Screen */
.auth-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    font-size: 1.1rem;
    color: var(--lec-text-light);
}

/* Top Navigation */
.lec-nav {
    background: var(--lec-primary);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.lec-nav-logo {
    font-family: var(--lec-font-serif);
    color: var(--lec-white);
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: none;
}

.lec-nav-logo .cross { color: var(--lec-accent); margin-right: 6px; }

.lec-nav-links {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lec-nav-links a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.3s;
}

.lec-nav-links a:hover { color: var(--lec-accent); }

.lec-nav-user {
    color: var(--lec-accent-light);
    font-size: 0.82rem;
    font-weight: 600;
}

/* Page Container */
.lec-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 32px 80px;
}

/* Cover / Header */
.lec-cover {
    text-align: center;
    padding: 48px 24px;
    margin-bottom: 48px;
    background: linear-gradient(135deg, var(--lec-primary), #16213e);
    border-radius: 16px;
    color: var(--lec-white);
    position: relative;
    overflow: hidden;
}

.lec-cover::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 60% 50% at 50% 40%, rgba(201,169,110,0.12) 0%, transparent 70%);
}

.lec-cover-agent {
    display: inline-block;
    background: rgba(201,169,110,0.2);
    border: 1px solid rgba(201,169,110,0.4);
    color: var(--lec-accent-light);
    font-size: 0.8rem;
    font-weight: 700;
    padding: 5px 18px;
    border-radius: 30px;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.lec-cover-num {
    font-family: var(--lec-font-serif);
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--lec-accent);
    margin-bottom: 8px;
    position: relative;
    z-index: 1;
}

.lec-cover-title {
    font-family: var(--lec-font-serif);
    font-size: 1.6rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}

.lec-cover-subtitle {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.7);
    position: relative;
    z-index: 1;
}

.lec-cover-meta {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 20px;
    font-size: 0.82rem;
    color: rgba(255,255,255,0.5);
    position: relative;
    z-index: 1;
}

/* Section */
.lec-section {
    margin-bottom: 40px;
}

.lec-section-title {
    font-family: var(--lec-font-serif);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--lec-primary);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--lec-accent);
    display: flex;
    align-items: center;
    gap: 10px;
}

.lec-section-title .icon { font-size: 1.2rem; }

/* Objectives */
.lec-objectives {
    background: var(--lec-bg-warm);
    border-left: 4px solid var(--lec-accent);
    border-radius: 0 12px 12px 0;
    padding: 20px 24px;
    margin-bottom: 24px;
}

.lec-objectives li {
    margin-bottom: 8px;
    padding-left: 8px;
    font-size: 0.95rem;
    line-height: 1.7;
}

.lec-objectives li strong {
    color: var(--lec-accent-dark);
}

/* Content Block */
.lec-content-block {
    margin-bottom: 32px;
}

.lec-content-block h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--lec-primary);
    margin-bottom: 12px;
    padding-left: 12px;
    border-left: 3px solid var(--lec-accent);
}

.lec-content-block p {
    margin-bottom: 12px;
    line-height: 1.85;
}

.lec-content-block ul, .lec-content-block ol {
    padding-left: 24px;
    margin-bottom: 12px;
}

.lec-content-block li {
    margin-bottom: 6px;
    line-height: 1.75;
}

/* Prompt Box */
.lec-prompt-box {
    background: #1a1a2e;
    color: #e4d5b7;
    border-radius: 12px;
    padding: 24px;
    margin: 20px 0;
    font-family: 'Courier New', monospace;
    font-size: 0.88rem;
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-word;
    position: relative;
    overflow-x: auto;
}

.lec-prompt-label {
    display: inline-block;
    background: var(--lec-accent);
    color: var(--lec-primary);
    font-family: var(--lec-font-sans);
    font-size: 0.72rem;
    font-weight: 700;
    padding: 3px 12px;
    border-radius: 4px;
    margin-bottom: 12px;
    letter-spacing: 0.05em;
}

/* Step Guide */
.lec-steps {
    counter-reset: step-counter;
    padding: 0;
    list-style: none;
}

.lec-steps li {
    counter-increment: step-counter;
    padding: 16px 16px 16px 56px;
    margin-bottom: 12px;
    background: var(--lec-white);
    border: 1px solid var(--lec-border);
    border-radius: 10px;
    position: relative;
    line-height: 1.7;
}

.lec-steps li::before {
    content: counter(step-counter);
    position: absolute;
    left: 16px;
    top: 16px;
    width: 28px;
    height: 28px;
    background: var(--lec-accent);
    color: var(--lec-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.82rem;
    font-weight: 700;
}

.lec-steps li strong {
    color: var(--lec-primary);
}

/* Info Table */
.lec-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 0.9rem;
}

.lec-table th {
    background: var(--lec-primary);
    color: var(--lec-white);
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    font-size: 0.82rem;
}

.lec-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--lec-border);
}

.lec-table tr:nth-child(even) td {
    background: var(--lec-bg-warm);
}

/* Handout Box */
.lec-handout {
    background: linear-gradient(135deg, rgba(201,169,110,0.08), rgba(201,169,110,0.03));
    border: 1px solid rgba(201,169,110,0.2);
    border-radius: 12px;
    padding: 20px 24px;
    margin: 24px 0;
}

.lec-handout-title {
    font-weight: 700;
    color: var(--lec-accent-dark);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.lec-handout li {
    font-size: 0.9rem;
    margin-bottom: 4px;
}

/* Assignment / Next */
.lec-assignment {
    background: var(--lec-white);
    border: 2px dashed var(--lec-accent);
    border-radius: 12px;
    padding: 24px;
    margin: 24px 0;
}

.lec-assignment h3 {
    color: var(--lec-accent-dark);
    margin-bottom: 12px;
    border: none;
    padding: 0;
}

/* Footer */
.lec-footer {
    text-align: center;
    padding: 32px 24px;
    border-top: 1px solid var(--lec-border);
    color: var(--lec-text-light);
    font-size: 0.8rem;
    line-height: 1.8;
}

/* Pagination */
.lec-pagination {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--lec-border);
}

.lec-pagination a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--lec-primary);
    color: var(--lec-accent-light);
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.88rem;
    font-weight: 600;
    transition: background 0.3s;
}

.lec-pagination a:hover {
    background: #16213e;
}

/* Tip / Warning Box */
.lec-tip {
    background: #e8f5e9;
    border-left: 4px solid #2d6a4f;
    padding: 14px 18px;
    border-radius: 0 8px 8px 0;
    margin: 16px 0;
    font-size: 0.9rem;
}

.lec-warning {
    background: #fff3e0;
    border-left: 4px solid #e65100;
    padding: 14px 18px;
    border-radius: 0 8px 8px 0;
    margin: 16px 0;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .lec-container { padding: 24px 16px 60px; }
    .lec-cover { padding: 32px 16px; }
    .lec-cover-num { font-size: 2.5rem; }
    .lec-cover-title { font-size: 1.3rem; }
    .lec-cover-meta { flex-direction: column; gap: 8px; }
    .lec-prompt-box { font-size: 0.8rem; padding: 16px; }
    .lec-pagination { flex-direction: column; }
}

/* Print Styles */
@media print {
    @page { size: A4; margin: 20mm 15mm; }
    body { font-size: 11pt; line-height: 1.6; background: white; }
    .lec-nav, .lec-pagination, .auth-loading { display: none !important; }
    .lec-container { max-width: 100%; padding: 0; }
    .lec-cover {
        background: white !important;
        color: black !important;
        border: 2px solid #333;
        page-break-after: avoid;
    }
    .lec-cover-agent { border-color: #333; color: #333; }
    .lec-cover-num { color: #333; }
    .lec-cover-subtitle, .lec-cover-meta { color: #666 !important; }
    .lec-prompt-box {
        background: #f5f5f5 !important;
        color: #333 !important;
        border: 1px solid #ccc;
    }
    .lec-section { page-break-inside: avoid; }
    a { color: inherit; text-decoration: none; }
}