/* ==========================================================================
   CB Learn Hub — Design System
   Theme: Chalkboard & Notebook (classroom-rooted, not a generic SaaS look)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Sinhala:wght@400;500;600;700;800&family=Noto+Serif+Sinhala:wght@500;600;700&family=Space+Grotesk:wght@500;600;700&display=swap');

:root {
    /* Color tokens */
    --ink: #14171f;            /* chalkboard */
    --ink-soft: #22273a;
    --chalk: #f7f4ec;          /* chalk / paper white */
    --paper: #fbf8f2;          /* card paper */
    --paper-line: #dad3c2;     /* ruled line on paper */
    --primary: #ff6b2c;        /* brand orange, refined */
    --primary-dark: #e0551a;
    --gold: #e8b34a;           /* seal / accent */
    --text: #2a2a2e;
    --text-muted: #6b6b72;
    --white: #ffffff;

    /* Type */
    --font-display: 'Noto Serif Sinhala', 'Space Grotesk', serif;
    --font-body: 'Noto Sans Sinhala', 'Space Grotesk', sans-serif;
    --font-label: 'Space Grotesk', 'Noto Sans Sinhala', sans-serif;

    --transition: all 0.25s ease-in-out;
    --radius: 14px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--text);
    background-color: var(--white);
    line-height: 1.6;
}

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

a { color: inherit; }

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

section { position: relative; }

/* Chalk hand-drawn underline — the recurring signature element */
.chalk-underline {
    position: relative;
    display: inline-block;
}
.chalk-underline::after {
    content: "";
    position: absolute;
    left: -2%;
    right: -2%;
    bottom: -0.18em;
    height: 0.35em;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 300 20' preserveAspectRatio='none'%3E%3Cpath d='M2 12 C 40 4, 80 18, 120 9 S 200 2, 240 12 S 280 6, 298 10' stroke='%23FF6B2C' stroke-width='5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: 100% 100%;
}
.chalk-underline.on-dark::after {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 300 20' preserveAspectRatio='none'%3E%3Cpath d='M2 12 C 40 4, 80 18, 120 9 S 200 2, 240 12 S 280 6, 298 10' stroke='%23E8B34A' stroke-width='5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
}

.eyebrow {
    font-family: var(--font-label);
    font-size: 13px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--primary);
    font-weight: 600;
    display: inline-block;
    margin-bottom: 14px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(28px, 4vw, 40px);
    color: var(--ink);
    margin-bottom: 18px;
    font-weight: 600;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-muted);
    max-width: 620px;
}

.section-head {
    margin-bottom: 50px;
}
.section-head.center {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}
.section-head.center .section-subtitle {
    margin-left: auto;
    margin-right: auto;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 15px;
    text-decoration: none;
    transition: var(--transition);
    font-family: var(--font-body);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}
.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--chalk);
    border-color: rgba(247, 244, 236, 0.5);
}
.btn-secondary:hover {
    background-color: var(--chalk);
    color: var(--ink);
    border-color: var(--chalk);
}

.btn-outline {
    background-color: transparent;
    color: var(--ink);
    border-color: var(--ink);
}
.btn-outline:hover {
    background-color: var(--ink);
    color: var(--chalk);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header {
    background-color: rgba(251, 248, 242, 0.92);
    backdrop-filter: blur(8px);
    box-shadow: 0 1px 0 var(--paper-line);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 16px 0;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}

.logo {
    font-family: var(--font-label);
    font-size: 21px;
    font-weight: 700;
    color: var(--ink);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.logo i {
    color: var(--primary);
    font-size: 20px;
}

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--ink);
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
    position: relative;
    padding-bottom: 4px;
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: width 0.25s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-dark);
}
.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

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

.menu-toggle {
    display: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--ink);
    background: none;
    border: none;
}

/* ==========================================================================
   Hero — chalkboard
   ========================================================================== */
.hero {
    background-color: var(--ink);
    background-image:
        repeating-linear-gradient(rgba(247,244,236,0.05) 0px, rgba(247,244,236,0.05) 1px, transparent 1px, transparent 42px),
        radial-gradient(circle at 15% 20%, rgba(255,107,44,0.14), transparent 45%),
        radial-gradient(circle at 85% 80%, rgba(232,179,74,0.12), transparent 45%);
    min-height: 86vh;
    display: flex;
    align-items: center;
    color: var(--chalk);
    padding: 90px 0 70px;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 50px;
    align-items: center;
}

.hero-content h1 {
    font-family: var(--font-display);
    font-size: clamp(32px, 4.6vw, 52px);
    line-height: 1.25;
    margin-bottom: 24px;
    font-weight: 600;
}

.hero-content p {
    font-size: 17px;
    margin-bottom: 34px;
    max-width: 520px;
    color: rgba(247, 244, 236, 0.78);
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 34px;
    margin-top: 46px;
    flex-wrap: wrap;
}
.hero-stats .stat-num {
    font-family: var(--font-label);
    font-size: 28px;
    font-weight: 700;
    color: var(--gold);
}
.hero-stats .stat-label {
    font-size: 13px;
    color: rgba(247, 244, 236, 0.65);
}

/* Hero visual: a stylized chalkboard "note" card */
.hero-visual {
    background-color: var(--paper);
    border-radius: var(--radius);
    padding: 30px;
    color: var(--text);
    transform: rotate(2deg);
    box-shadow: 0 20px 50px rgba(0,0,0,0.35);
    position: relative;
}
.hero-visual::before {
    content: "";
    position: absolute;
    top: -10px;
    left: 30px;
    width: 34px;
    height: 34px;
    background: var(--primary);
    border-radius: 50%;
    box-shadow: 0 3px 6px rgba(0,0,0,0.25);
}
.hero-visual h4 {
    font-family: var(--font-display);
    font-size: 19px;
    margin-bottom: 14px;
    color: var(--ink);
}
.hero-visual ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.hero-visual li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14.5px;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--paper-line);
}
.hero-visual li:last-child { border-bottom: none; padding-bottom: 0; }
.hero-visual li i { color: var(--primary); width: 18px; }

/* ==========================================================================
   Index-card style — used for subjects & feature cards
   ========================================================================== */
.index-card {
    background-color: var(--paper);
    background-image: repeating-linear-gradient(
        var(--paper) 0px, var(--paper) 33px,
        var(--paper-line) 33px, var(--paper-line) 34px
    );
    border-radius: 4px 10px 10px 4px;
    box-shadow: 0 6px 18px rgba(20, 23, 31, 0.07);
    position: relative;
    padding: 34px 28px 28px 34px;
    transition: var(--transition);
    border-left: 4px solid var(--primary);
}
.index-card::before {
    content: "";
    position: absolute;
    top: 16px;
    right: 18px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--gold);
    box-shadow: -18px 0 0 var(--paper-line);
}
.index-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 34px rgba(255, 107, 44, 0.18);
}

/* ==========================================================================
   Subjects Section
   ========================================================================== */
.subjects {
    padding: 100px 0;
    background-color: var(--white);
}

.subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
}

.subject-icon {
    font-size: 30px;
    color: var(--primary);
    margin-bottom: 18px;
}

.subject-card h3 {
    font-family: var(--font-display);
    margin-bottom: 12px;
    color: var(--ink);
    font-size: 19px;
    font-weight: 600;
}

.subject-card p {
    color: var(--text-muted);
    font-size: 14.5px;
}

/* ==========================================================================
   Teachers — teaser (home) & full grid (teachers page)
   ========================================================================== */
.teachers {
    padding: 100px 0;
    background-color: var(--chalk);
    background-image: radial-gradient(circle at 90% 10%, rgba(255,107,44,0.06), transparent 40%);
}

.teacher-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.teacher-card {
    background-color: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 6px 20px rgba(20,23,31,0.06);
    transition: var(--transition);
    text-align: center;
}

.teacher-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 34px rgba(20,23,31,0.12);
}

/* --- පින්තූරය පාලනය කරන නවීකරණය කරන ලද CSS කොටස --- */
.teacher-photo {
    width: 100%;
    height: 350px; /* Card එකේ පින්තූරයට ගැලපෙනම උස (Height) මෙයයි (ඔබට අවශ්‍ය නම් 250px-300px අතර වෙනස් කර බලන්න) */
    overflow: hidden;
    position: relative;
    background: linear-gradient(160deg, var(--ink) 0%, var(--ink-soft) 100%);
}

.responsive-teacher-img {
    width: 100%;
    height: 100%;
    object-fit: cover; /* පින්තූර ඇද නොවී රාමුවට ලස්සනට කැපී සෙට් වීමට */
    object-position: top center; /* ගුරුවරුන්ගේ මුහුණු පැහැදිලිව ඉහළින් පෙන්වීමට */
}
/* ---------------------------------------------------- */

.teacher-info {
    padding: 22px 20px 26px;
}

.teacher-info h3 {
    font-family: var(--font-display);
    font-size: 18px;
    color: var(--ink);
    margin-bottom: 4px;
    font-weight: 600;
}

.teacher-subject {
    display: inline-block;
    font-family: var(--font-label);
    font-size: 12px;
    letter-spacing: 0.05em;
    color: var(--primary-dark);
    background: rgba(255,107,44,0.1);
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 12px;
    font-weight: 600;
}

.teacher-info p.bio {
    font-size: 13.5px;
    color: var(--text-muted);
    margin-bottom: 14px;
    min-height: 40px;
}

.teacher-meta {
    display: flex;
    justify-content: center;
    gap: 16px;
    font-size: 12.5px;
    color: var(--text-muted);
    border-top: 1px dashed var(--paper-line);
    padding-top: 12px;
}

.teacher-meta span i { 
    color: var(--gold); 
    margin-right: 4px; 
}

.teachers-cta {
    text-align: center;
    margin-top: 50px;
}

/* Full teachers page hero (smaller than home hero) */
.page-hero {
    background-color: var(--ink);
    background-image:
        repeating-linear-gradient(rgba(247,244,236,0.05) 0px, rgba(247,244,236,0.05) 1px, transparent 1px, transparent 42px),
        radial-gradient(circle at 85% 30%, rgba(232,179,74,0.14), transparent 45%);
    color: var(--chalk);
    padding: 70px 0 60px;
    text-align: center;
}
.page-hero h1 {
    font-family: var(--font-display);
    font-size: clamp(28px, 4vw, 42px);
    margin-bottom: 16px;
    font-weight: 600;
}
.page-hero p {
    max-width: 600px;
    margin: 0 auto;
    color: rgba(247,244,236,0.75);
    font-size: 16px;
}

.filter-bar {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 50px;
}
.filter-btn {
    font-family: var(--font-label);
    font-size: 13.5px;
    font-weight: 600;
    padding: 9px 20px;
    border-radius: 20px;
    border: 1.5px solid var(--paper-line);
    background: var(--white);
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
}
.filter-btn:hover { border-color: var(--primary); color: var(--primary-dark); }
.filter-btn.active {
    background: var(--ink);
    border-color: var(--ink);
    color: var(--chalk);
}

/* ==========================================================================
   About page
   ========================================================================== */
.about-block {
    padding: 90px 0;
}
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.about-grid.reverse .about-text { order: 2; }
.about-note {
    background: var(--ink);
    color: var(--chalk);
    border-radius: var(--radius);
    padding: 40px;
    position: relative;
    transform: rotate(-1.5deg);
    box-shadow: 0 18px 40px rgba(20,23,31,0.18);
}
.about-note h4 {
    font-family: var(--font-display);
    color: var(--gold);
    margin-bottom: 12px;
    font-size: 20px;
}
.about-text p { color: var(--text-muted); margin-bottom: 16px; font-size: 15.5px; }

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    margin-top: 50px;
}
.value-card {
    text-align: center;
    padding: 28px 20px;
}
.value-card i {
    font-size: 26px;
    color: var(--primary);
    margin-bottom: 14px;
}
.value-card h4 {
    font-family: var(--font-display);
    font-size: 16.5px;
    margin-bottom: 8px;
    color: var(--ink);
}
.value-card p { font-size: 13.5px; color: var(--text-muted); }

/* ==========================================================================
   Contact page
   ========================================================================== */
.contact-block { padding: 90px 0; background: var(--chalk); }
.contact-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 50px;
}
.contact-info-card {
    background: var(--ink);
    color: var(--chalk);
    border-radius: var(--radius);
    padding: 38px 32px;
}
.contact-info-card h3 {
    font-family: var(--font-display);
    color: var(--gold);
    margin-bottom: 24px;
    font-size: 20px;
}
.contact-item {
    display: flex;
    gap: 14px;
    margin-bottom: 22px;
    align-items: flex-start;
}
.contact-item i {
    color: var(--primary);
    font-size: 17px;
    margin-top: 3px;
}
.contact-item span { font-size: 14.5px; color: rgba(247,244,236,0.85); }

.contact-form {
    background: var(--white);
    border-radius: var(--radius);
    padding: 38px 32px;
    box-shadow: 0 6px 20px rgba(20,23,31,0.06);
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    font-size: 13.5px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--ink);
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid var(--paper-line);
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 14.5px;
    transition: var(--transition);
    background: var(--paper);
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ==========================================================================
   CTA band
   ========================================================================== */
.cta-band {
    background: linear-gradient(120deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 60px 0;
    text-align: center;
}
.cta-band h2 {
    font-family: var(--font-display);
    font-size: clamp(24px, 3vw, 32px);
    margin-bottom: 14px;
}
.cta-band p { margin-bottom: 26px; color: rgba(255,255,255,0.9); }
.cta-band .btn-secondary { border-color: rgba(255,255,255,0.6); color: var(--white); }
.cta-band .btn-secondary:hover { background: var(--white); color: var(--primary-dark); }

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background-color: var(--ink);
    color: var(--chalk);
    padding: 56px 0 24px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 36px;
    border-bottom: 1px solid rgba(247,244,236,0.12);
}
.footer-brand .logo { color: var(--chalk); margin-bottom: 14px; }
.footer-brand p { color: rgba(247,244,236,0.6); font-size: 14px; max-width: 320px; }
.footer-col h5 {
    font-family: var(--font-label);
    font-size: 13px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 16px;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col a {
    text-decoration: none;
    color: rgba(247,244,236,0.72);
    font-size: 14px;
    transition: var(--transition);
}
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
    padding-top: 22px;
    text-align: center;
    font-size: 13px;
    color: rgba(247,244,236,0.5);
}

/* ==========================================================================
   Accessibility
   ========================================================================== */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--gold);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; }
}

/* ==========================================================================
   Mobile Responsive
   ========================================================================== */
@media (max-width: 900px) {
    .hero-inner { grid-template-columns: 1fr; }
    .hero-visual { transform: none; order: -1; }
    .about-grid { grid-template-columns: 1fr; }
    .about-grid.reverse .about-text { order: 0; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 68px;
        left: 0;
        width: 100%;
        background-color: var(--paper);
        padding: 22px 24px;
        box-shadow: 0 8px 18px rgba(0,0,0,0.1);
        gap: 18px;
        align-items: flex-start;
    }
    .nav-links.active { display: flex; }
    .menu-toggle { display: block; }
    .nav-actions .btn-login { display: none; }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 480px) {
    .hero { padding: 60px 0 50px; min-height: auto; }
    .hero-buttons { flex-direction: column; }
    .hero-buttons .btn { width: 100%; justify-content: center; }
}