@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;600;700;800&display=swap');

/* ===========================
   CSS Variables
   =========================== */
:root {
    --primary-color: #67A3B3;
    --secondary-color: #0b5565;
    --accent-color: #7a4b00;
    --text-color: #2f3a3d;
    --light-bg: #f7fbfc;
    --white: #ffffff;
    --border-color: #d9e7ec;
    --card-border: #e3eef2;
    --discussion-bg: #fff6e8;
    --discussion-border: #ffe1b5;
    --shadow: 0 2px 5px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

/* ===========================
   Base Styles
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Open Sans', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: var(--secondary-color);
    transition: var(--transition);
}

a:hover {
    color: var(--primary-color);
}

/* ===========================
   Layout
   =========================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

main {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 clamp(0.75rem, 3vw, 3rem);
    overflow: visible;
}

/* ===========================
   Typography
   =========================== */
h1 {
    font-size: clamp(32px, 6vw, 48px);
}

h2 {
    font-size: clamp(22px, 3.6vw, 30px);
    color: var(--primary-color);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: clamp(18px, 3vw, 24px);
    color: var(--primary-color);
}

p {
    margin-bottom: 1rem;
}

/* ===========================
   Sections
   =========================== */
section {
    background: var(--white);
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    overflow: visible;
}

section.hero {
    background: var(--primary-color);
    color: white;
    border: none;
}

section.hero h2 {
    color: white;
    border-bottom: none;
}

section.hero p {
    font-size: clamp(15px, 2.6vw, 18px);
    opacity: 0.95;
}

section.hero ul {
    margin: 12px 0 18px 20px;
}

.key-contacts {
    margin-top: 16px;
    padding: 0;
}

.key-contacts-title {
    font-weight: 800;
    margin-bottom: 8px;
    color: #fff;
}

.key-contacts-row {
    display: grid;
    grid-template-columns: 1.2fr 1.4fr 1fr;
    gap: 12px;
    line-height: 1.35;
    color: #fff;
}

.key-contacts-row + .key-contacts-row {
    margin-top: 16px;
}

.contact-title {
    font-size: 0.9em;
    color: rgba(255, 255, 255, 0.85);
    margin-top: 4px;
    font-weight: 400;
}

.key-contacts a {
    color: #fff;
    text-decoration: underline;
}

@media (max-width: 700px) {
    .key-contacts-row {
        grid-template-columns: 1fr;
    }
}

/* ===========================
   Logo Strip
   =========================== */
.logo-strip {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 22px 16px 18px 16px;
    text-align: center;
}

.logo-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 28px;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.logo-link {
    display: inline-block;
    line-height: 0;
    border: none;
    text-decoration: none;
}

.logo-link:hover {
    opacity: 0.8;
    transform: translateY(-2px);
    transition: all 0.3s ease;
}

.logo-row img {
    height: 40px;
    max-width: 100%;
    display: block;
}

.logo-row img[alt*="Kenya Mathematical Society"] {
    height: 112px;
}

.logo-caption {
    color: #777;
    font-size: 14px;
    line-height: 1.4;
    margin: 0;
    text-align: center;
    width: 100%;
}

.about-logos {
    justify-content: center;
    margin: 12px 0 8px 0;
}

.about-note {
    margin-top: 14px;
    color: var(--text-color);
    text-align: left;
}

.about-cta {
    margin-top: 12px;
}

.about-preview h2,
.about-preview h3 {
    color: var(--primary-color);
}

.about-preview p {
    font-size: 0.95em;
    margin-bottom: 0.5rem;
}

/* ===========================
   Cards & Components
   =========================== */
.card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--card-border);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.15);
}

.card h3 {
    font-size: clamp(18px, 3vw, 22px);
    margin-bottom: 0.75rem;
}

.card h4 {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.resource-type-grid {
    margin-top: 1.5rem;
}

.resource-type-card {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    height: 100%;
}

.resource-type-card-buttons {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-top: auto;
    min-height: 150px;
}

.resource-type-card .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
}

.resource-type-card h3 {
    color: var(--text-color);
}

.lesson-plan-chapter-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: auto;
    align-items: center;
    min-height: 150px;
}

.lesson-plan-chapter-buttons .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
}

.resource-list {
    display: grid;
    gap: 1.5rem;
    margin: 1.5rem 0 0 0;
}

.lesson-plan-catalog {
    display: grid;
    gap: 1.5rem;
}

.lesson-plan-intro {
    margin-bottom: 1rem;
}

.lesson-plan-sections {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.lesson-plan-section {
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
}

.lesson-plan-section-header {
    cursor: pointer;
    list-style: none;
}

.lesson-plan-section-header::-webkit-details-marker {
    display: none;
}

.lesson-plan-section-header::marker {
    display: none;
}

.lesson-plan-section-header h3 {
    display: block;
    margin-bottom: 0.5rem;
    width: 100%;
}

.lesson-plan-section-header h3::before {
    content: '▶ ';
    display: inline-block;
    transition: transform 0.2s;
    margin-right: 0.5rem;
}

.lesson-plan-section[open] .lesson-plan-section-header h3::before {
    transform: rotate(90deg);
}

.lesson-plan-lessons {
    margin-top: 1rem;
}

.lesson-plan-course {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0;
    flex-wrap: wrap;
}

.lesson-plan-course h4 {
    margin: 0;
    color: var(--secondary-color);
    font-size: 1.1rem;
    font-weight: 400;
}

.lesson-plan-course h4 strong {
    font-weight: 700;
}

.btn-access-course {
    white-space: nowrap;
    font-size: 0.95rem;
    margin-left: auto;
}

.lesson-plan-quick-access {
    font-size: 0.9rem;
    color: #555;
    margin-top: 0.75rem;
    margin-bottom: 1rem;
    line-height: 1.5;
}

.lesson-plan-device-section {
    background: var(--white);
    border: 2px solid #e3eef2;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
}

.lesson-plan-device-header {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-color);
    margin-bottom: 0.75rem;
}

.lesson-plan-lessons {
    display: grid;
    gap: 0.75rem;
    margin-top: 1rem;
}

.lesson-plan-lesson {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.75rem 1rem;
}

.lesson-plan-lesson summary {
    cursor: pointer;
    font-weight: 700;
    color: var(--secondary-color);
    list-style: none;
}

.lesson-plan-lesson summary::-webkit-details-marker {
    display: none;
}

.lesson-plan-lesson summary::before {
    content: "▸";
    display: inline-block;
    margin-right: 0.5rem;
    transform: translateY(-1px);
}

.lesson-plan-lesson[open] summary::before {
    content: "▾";
}

.lesson-plan-resources {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.lesson-plan-empty {
    color: #777;
    font-style: italic;
    margin-top: 0.5rem;
}

/* Learning Objectives */
.lesson-plan-learning-objectives {
    background: #f8fbfc;
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 6px;
}

.lesson-plan-learning-objectives h4 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

.lesson-plan-learning-objectives ul {
    margin: 0;
    padding-left: 1.5rem;
}

.lesson-plan-learning-objectives li {
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

/* Subsections */
.lesson-plan-subsections {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1rem;
}

.lesson-plan-subsection {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.75rem 1rem;
}

.lesson-plan-subsection-header {
    cursor: pointer;
    list-style: none;
}

.lesson-plan-subsection-header::-webkit-details-marker {
    display: none;
}

.lesson-plan-subsection-header::marker {
    display: none;
}

.lesson-plan-subsection-header h4 {
    display: inline;
    font-weight: 700;
    color: var(--secondary-color);
    margin: 0;
}

.lesson-plan-subsection-header h4::before {
    content: "▸ ";
    display: inline-block;
    margin-right: 0.25rem;
}

.lesson-plan-subsection[open] .lesson-plan-subsection-header h4::before {
    content: "▾ ";
}

/* Topics */
.lesson-plan-topics {
    display: grid;
    gap: 0.75rem;
    margin-top: 0.75rem;
}

.lesson-plan-topic {
    background: #fafafa;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 0.75rem;
}

.lesson-plan-topic summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text-color);
    list-style: none;
}

.lesson-plan-topic summary::-webkit-details-marker {
    display: none;
}

.lesson-plan-topic summary::before {
    content: "▸";
    display: inline-block;
    margin-right: 0.5rem;
    transform: translateY(-1px);
}

.lesson-plan-topic[open] summary::before {
    content: "▾";
}

.lesson-plan-topic-objectives {
    margin: 0.75rem 0;
    font-size: 0.9rem;
}

.lesson-plan-topic-objectives p {
    margin: 0 0 0.5rem 0;
    color: var(--secondary-color);
}

.lesson-plan-topic-objectives ul {
    margin: 0;
    padding-left: 1.5rem;
}

.lesson-plan-topic-objectives li {
    margin-bottom: 0.25rem;
    line-height: 1.4;
}

/* Direct Topics (without nesting) */
.lesson-plan-topic-direct {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1rem;
    margin-top: 0.75rem;
}

.lesson-plan-topic-direct h4 {
    color: var(--secondary-color);
    margin-top: 0;
    margin-bottom: 0.75rem;
}

/* Button Disabled State */
.btn-disabled {
    background-color: #e0e0e0;
    color: #999;
    border-color: #e0e0e0;
    cursor: not-allowed;
    opacity: 0.7;
}

.btn-disabled:hover {
    background-color: #e0e0e0;
    color: #999;
    border-color: #e0e0e0;
    transform: none;
    box-shadow: none;
}

.resource-card {
    display: grid;
    grid-template-columns: 48px 1fr auto;
    gap: 16px;
    align-items: center;
}

.resource-icon {
    font-size: 28px;
    text-align: center;
}

.resource-body p {
    margin-bottom: 0;
}

@media (max-width: 700px) {
    .resource-card {
        grid-template-columns: 1fr;
        align-items: start;
    }
    .resource-cta {
        margin-top: 8px;
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 12px;
    background: var(--light-bg);
    color: var(--secondary-color);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    text-align: center;
}

.btn:hover {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 10px rgba(0,0,0,0.2);
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: var(--white);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--white);
    border-color: var(--secondary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--white);
}

/* ===========================
   Footer
   =========================== */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

footer a {
    color: var(--white);
    text-decoration: underline;
}

footer a:hover {
    color: var(--light-bg);
}

/* ===========================
   Utility Classes
   =========================== */
.info-box {
    background: var(--light-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 14px;
    margin-bottom: 14px;
}

.discussion-box {
    background: var(--discussion-bg);
    border: 1px solid var(--discussion-border);
    border-radius: 14px;
    padding: 16px;
    margin-bottom: 20px;
}

.discussion-box .btn {
    background: var(--white);
    border-color: var(--discussion-border);
    color: var(--accent-color);
}

.discussion-box .btn:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: var(--white);
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    section {
        padding: 1.5rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.75rem;
    }
    
    main {
        margin: 1rem auto;
        padding: 0 0.5rem;
    }
    
    section {
        padding: 0.75rem;
        margin-bottom: 1rem;
    }
    
    .container {
        padding: 0 0.5rem;
    }
    
    /* Reduce nested padding in lesson plans to prevent content squashing */
    .lesson-plan-section {
        padding: 0.75rem;
        border-radius: 8px;
    }
    
    .lesson-plan-subsection {
        padding: 0.5rem 0.75rem;
        border-radius: 6px;
        background: transparent;
        border-left: 3px solid var(--primary-color);
        border-top: none;
        border-right: none;
        border-bottom: none;
    }
    
    .lesson-plan-topic {
        padding: 0.5rem;
        border-radius: 6px;
        background: var(--white);
        border: 1px solid #e0e0e0;
    }
    
    .lesson-plan-topic-direct {
        padding: 0.5rem 0.75rem;
    }
    
    .lesson-plan-sections {
        gap: 1rem;
        margin-top: 1rem;
    }
    
    .lesson-plan-subsections {
        gap: 0.5rem;
        margin-top: 0.75rem;
    }
    
    .lesson-plan-topics {
        gap: 0.5rem;
        margin-top: 0.5rem;
    }
    
    /* Reduce button padding on mobile */
    .btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }
    
    .lesson-plan-course {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    
    .btn-access-course {
        margin-left: 0;
        width: 100%;
        text-align: center;
    }
}

/* ===========================
   About Page Accordion
   =========================== */
.about-accordion-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: transparent;
    border: none;
    padding: 0;
    margin-bottom: 2rem;
}

.about-accordion-item {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: box-shadow 0.2s ease;
}

.about-accordion-item[open] {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.about-accordion-header {
    display: flex;
    align-items: center;
    padding: 1.25rem 2rem;
    cursor: pointer;
    list-style: none;
    user-select: none;
    gap: 0.75rem;
}

.about-accordion-header::-webkit-details-marker {
    display: none;
}

.about-accordion-header::marker {
    display: none;
}

.about-accordion-header::before {
    content: '▶';
    display: inline-block;
    font-size: 0.75rem;
    color: var(--primary-color);
    transition: transform 0.2s ease;
    flex-shrink: 0;
    margin-top: 2px;
}

.about-accordion-item[open] > .about-accordion-header::before {
    transform: rotate(90deg);
}

.about-accordion-header h2 {
    margin: 0;
    border-bottom: none;
    padding-bottom: 0;
    font-size: clamp(18px, 2.8vw, 24px);
    color: var(--primary-color);
}

.about-accordion-header:hover h2 {
    color: var(--secondary-color);
}

.about-accordion-body {
    padding: 0 2rem 1.5rem 2rem;
}

.about-accordion-body p:last-child {
    margin-bottom: 0;
}

.about-tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin: 1.25rem 0;
}

.about-tech-item {
    background: var(--light-bg);
    border-left: 4px solid var(--primary-color);
    border-radius: 0 8px 8px 0;
    padding: 1rem 1.25rem;
}

.about-tech-item h3 {
    font-size: 1.05rem;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.about-tech-item h3 a {
    color: var(--secondary-color);
    text-decoration: none;
}

.about-tech-item h3 a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.about-tech-item p {
    font-size: 0.9rem;
    margin-bottom: 0;
    color: var(--text-color);
}