/* ============================================================
   Garden Paper Mart Academy — Shared Stylesheet
   O Level / IGCSE Mathematics (4024 / 0580)
   Additional Mathematics (4037)
   Version 1.0 — 2026
   Primary: Dark Blue #1a237e  Accent: Cyan/Light Blue #00acc1
   ============================================================ */

/* RESET & BASE */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: Georgia, 'Times New Roman', serif;
    background: #f4f6fb;
    color: #1a1a1a;
    line-height: 1.75;
}

/* HEADER */
header {
    background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
    color: white;
    padding: 22px 30px;
    border-bottom: 4px solid #00acc1;
}
.breadcrumb { font-size: 13px; margin-bottom: 8px; }
.breadcrumb a { color: #80cbc4; text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
header h1 { font-size: 26px; font-weight: bold; }
header p.subtitle {
    color: #b3c5f7;
    font-size: 14px;
    margin-top: 6px;
}

/* MAIN CONTAINER */
.container { max-width: 880px; margin: 30px auto; padding: 0 20px 60px; }

/* SECTIONS */
section {
    background: white;
    border-radius: 8px;
    padding: 24px 28px;
    margin-bottom: 24px;
    box-shadow: 0 1px 5px rgba(26,35,126,0.07);
    border-top: 3px solid #1a237e;
}

/* HEADINGS */
h2 {
    color: #1a237e;
    font-size: 20px;
    margin-bottom: 14px;
    border-bottom: 2px solid #e3e8f8;
    padding-bottom: 8px;
}
h3 {
    color: #1a237e;
    font-size: 17px;
    margin: 18px 0 10px;
}
h4 { color: #283593; margin-bottom: 6px; }

/* TYPOGRAPHY */
p { margin-bottom: 12px; }
ul, ol { margin: 10px 0 12px 22px; }
li { margin-bottom: 6px; }
strong { color: #1a237e; }

/* TABLES */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 14px;
    font-size: 15px;
}
th {
    background: #1a237e;
    color: white;
    padding: 10px 14px;
    text-align: left;
    border: 1px solid #c5cae9;
}
td {
    padding: 10px 14px;
    border: 1px solid #e3e8f8;
    vertical-align: top;
}
tr:nth-child(even) td { background: #e8eaf6; }

/* KEY CONCEPT BOX — Dark Blue */
.key-concept {
    background: #e8eaf6;
    padding: 13px 17px;
    border-left: 5px solid #1a237e;
    margin: 14px 0;
    border-radius: 0 6px 6px 0;
}
.key-concept strong { color: #1a237e; }

/* CYAN ACCENT BOX — for rules and laws */
.rule-box {
    background: #e0f7fa;
    padding: 13px 17px;
    border-left: 5px solid #00acc1;
    margin: 14px 0;
    border-radius: 0 6px 6px 0;
}
.rule-box strong { color: #00695c; }

/* FORMULA BOX */
.formula-box {
    background: #e8eaf6;
    border: 2px solid #3949ab;
    border-radius: 8px;
    padding: 14px 20px;
    margin: 14px 0;
    font-size: 15px;
    text-align: center;
}
.formula-box h4 {
    color: #1a237e;
    margin-bottom: 8px;
    font-size: 15px;
    text-align: left;
}
.formula-box .formula {
    font-size: 17px;
    font-weight: bold;
    color: #1a237e;
    font-family: 'Courier New', monospace;
    margin: 6px 0;
}

/* WORKED EXAMPLE BOX */
.worked-example {
    background: #f1f8e9;
    border: 1px solid #aed581;
    border-radius: 8px;
    padding: 16px 20px;
    margin: 16px 0;
}
.worked-example h4 {
    color: #33691e;
    font-size: 15px;
    margin-bottom: 10px;
    border-bottom: 1px solid #c5e1a5;
    padding-bottom: 6px;
}
.worked-example .step {
    display: flex;
    gap: 12px;
    margin-bottom: 8px;
    font-size: 14px;
    align-items: flex-start;
}
.step-num {
    background: #1a237e;
    color: white;
    border-radius: 50%;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
    flex-shrink: 0;
    margin-top: 2px;
}
.step-content { flex: 1; line-height: 1.6; }
.step-content .math {
    font-family: 'Courier New', monospace;
    background: #e8eaf6;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 14px;
    display: inline-block;
    margin: 2px 0;
}

/* TIP BOX */
.tip-box {
    background: #fff8e1;
    padding: 13px 17px;
    border-left: 5px solid #ffa000;
    margin: 14px 0;
    border-radius: 0 6px 6px 0;
    font-size: 14px;
}
.tip-box strong { color: #e65100; }

/* WARNING BOX */
.warn-box {
    background: #fce4ec;
    padding: 13px 17px;
    border-left: 5px solid #e91e63;
    margin: 14px 0;
    border-radius: 0 6px 6px 0;
    font-size: 14px;
}
.warn-box strong { color: #880e4f; }

/* GRID LAYOUTS */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 14px;
}
.grid-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 14px;
    margin-top: 14px;
}

/* CARDS */
.card {
    background: #e8eaf6;
    border: 1px solid #c5cae9;
    border-radius: 6px;
    padding: 14px 16px;
}
.card h4 { color: #1a237e; margin-bottom: 6px; font-size: 15px; }

/* CYAN CARD */
.card-cyan {
    background: #e0f7fa;
    border: 1px solid #80deea;
    border-radius: 6px;
    padding: 14px 16px;
}
.card-cyan h4 { color: #006064; margin-bottom: 6px; font-size: 15px; }

/* DIAGRAM / SVG BOX */
.diagram-box {
    background: #f8f9fe;
    border: 2px dashed #9fa8da;
    border-radius: 8px;
    padding: 18px;
    text-align: center;
    margin: 14px 0;
}

/* EXAM PRACTICE SECTION */
.quiz-section {
    background: #e8eaf6;
    padding: 24px 28px;
    border-radius: 8px;
    margin-bottom: 24px;
    border-top: 3px solid #00acc1;
}
.quiz-section h3 { color: #1a237e; margin-bottom: 14px; }

.q-block {
    background: white;
    border-radius: 6px;
    padding: 16px 20px;
    margin-bottom: 16px;
    border: 1px solid #c5cae9;
}
.q-block p { margin-bottom: 6px; }

.answer {
    background: #e8f5e9;
    border-radius: 4px;
    padding: 10px 14px;
    margin-top: 10px;
    border-left: 3px solid #2e7d32;
    font-size: 14px;
    font-family: Georgia, serif;
}
.answer .math-ans {
    font-family: 'Courier New', monospace;
    background: #c8e6c9;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: bold;
}

.exam-tip {
    background: #fff3e0;
    border-radius: 4px;
    padding: 10px 14px;
    margin-top: 8px;
    border-left: 3px solid #ef6c00;
    font-size: 13px;
}

/* NAVIGATION BUTTONS */
.lesson-nav {
    text-align: center;
    margin-top: 10px;
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}
.btn {
    display: inline-block;
    background: #1a237e;
    color: white;
    padding: 12px 28px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 15px;
}
.btn:hover { background: #0d1757; }
.btn-cyan {
    display: inline-block;
    background: #00acc1;
    color: white;
    padding: 12px 28px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 15px;
}
.btn-cyan:hover { background: #007c91; }
.btn-outline {
    display: inline-block;
    background: white;
    color: #1a237e;
    border: 2px solid #1a237e;
    padding: 11px 28px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 15px;
}
.btn-outline:hover { background: #e8eaf6; }

/* SYLLABUS REFERENCE BADGE */
.syllabus-ref {
    display: inline-block;
    background: #1a237e;
    color: white;
    font-size: 11px;
    padding: 2px 10px;
    border-radius: 20px;
    margin-left: 8px;
    vertical-align: middle;
}
.syllabus-ref-cyan {
    display: inline-block;
    background: #00acc1;
    color: white;
    font-size: 11px;
    padding: 2px 10px;
    border-radius: 20px;
    margin-left: 8px;
    vertical-align: middle;
}

/* PROGRESS INDICATOR */
.lesson-progress {
    background: white;
    border-radius: 8px;
    padding: 14px 20px;
    margin-bottom: 20px;
    box-shadow: 0 1px 5px rgba(26,35,126,0.07);
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    font-size: 13px;
    color: #555;
}
.progress-bar-wrap {
    flex: 1;
    background: #e3e8f8;
    border-radius: 20px;
    height: 8px;
    min-width: 120px;
}
.progress-bar-fill {
    background: linear-gradient(90deg, #1a237e, #00acc1);
    height: 8px;
    border-radius: 20px;
}

/* FOOTER */
footer {
    text-align: center;
    padding: 20px;
    color: #666;
    font-size: 13px;
    border-top: 1px solid #e3e8f8;
    background: white;
}

/* RESPONSIVE */
@media(max-width:600px) {
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    header h1 { font-size: 20px; }
    .container { padding: 0 12px 40px; }
    .step { flex-direction: column; gap: 6px; }
}