/* ------------------------------ Theme Variables ------------------------------ All colors, shadows, and borders are defined as CSS custom properties here. Switching to dark mode is just a matter of overriding these on [data-theme="dark"] — no other rules need to change. JavaScript sets that attribute on . */ :root { --bg: #f6fbff; --bg-2: #e9f4ff; --surface: #ffffff; --text: #17324d; --muted: #41627f; --primary: #0b84f3; --secondary: #14b8a6; --accent: #ff9e1b; --danger: #e55353; --success: #1f9d5f; --focus: #111827; --border: #b9d5eb; --shadow: 0 10px 30px rgba(16, 45, 77, 0.12); } :root[data-theme="dark"] { --bg: #0d1b2a; --bg-2: #16283d; --surface: #122235; --text: #e8f2ff; --muted: #b5d0ea; --primary: #57b6ff; --secondary: #3ad8c9; --accent: #ffc45b; --danger: #ff7c7c; --success: #56d18b; --focus: #f8fafc; --border: #2b4964; --shadow: 0 12px 30px rgba(0, 0, 0, 0.35); } /* ------------------------------ Global Styles ------------------------------ box-sizing: border-box makes padding/border count inside the element's declared width, which avoids a lot of layout math. scroll-behavior: smooth enables anchor-link scrolling. */ * { box-sizing: border-box; } html { scroll-behavior: smooth; } body { margin: 0; font-family: "Nunito", sans-serif; color: var(--text); /* Three-layer background: two radial blobs for the colorful corner glows, plus a linear gradient that fades from --bg at the top to --bg-2 below. They're listed comma-separated so the browser stacks them. */ background: radial-gradient(circle at 10% 15%, rgba(11, 132, 243, 0.15), transparent 35%), radial-gradient(circle at 90% 5%, rgba(20, 184, 166, 0.2), transparent 30%), linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%); line-height: 1.6; } h1, h2, h3 { font-family: "Baloo 2", cursive; line-height: 1.2; margin-top: 0; } p, li, label, button, a, legend, input { /* clamp(min, preferred, max) scales the font smoothly between viewport sizes without needing explicit breakpoints. */ font-size: clamp(1rem, 0.95rem + 0.2vw, 1.08rem); } a { color: var(--primary); } a:hover { color: var(--secondary); } .section { max-width: 1120px; margin: 0 auto; padding: 4.5rem 1rem 2.5rem; } .section-heading { margin-bottom: 1.5rem; } .section-heading p { color: var(--muted); max-width: 65ch; } .skip-link { position: absolute; left: -999px; top: 8px; background: var(--accent); color: #111; padding: 0.7rem 1rem; border-radius: 0.6rem; z-index: 9999; font-weight: 700; } .skip-link:focus { left: 8px; } /* ------------------------------ Header / Navigation ------------------------------ The header is sticky so it stays visible while scrolling. backdrop-filter: blur() gives the frosted-glass effect behind it. color-mix() blends --bg with transparent so the page content shows through slightly (requires a modern browser). */ .site-header { position: sticky; top: 0; z-index: 1000; backdrop-filter: blur(8px); background: color-mix(in srgb, var(--bg) 75%, transparent); border-bottom: 1px solid var(--border); } .navbar { max-width: 1200px; margin: 0 auto; padding: 0.6rem 1rem; display: flex; align-items: center; gap: 0.9rem; } .brand { font-family: "Baloo 2", cursive; font-size: 1.45rem; text-decoration: none; color: var(--text); margin-right: auto; } .nav-links { list-style: none; display: flex; gap: 0.7rem; margin: 0; padding: 0; } .nav-links a { text-decoration: none; color: var(--text); padding: 0.55rem 0.75rem; border-radius: 999px; } .nav-links a:hover, .nav-links a:focus-visible { /* color-mix() blends two colors by percentage without needing a separate variable. Here it creates a subtle tinted hover pill. */ background: color-mix(in srgb, var(--primary) 17%, transparent); } .nav-toggle { display: none; border: 1px solid var(--border); background: var(--surface); border-radius: 0.8rem; padding: 0.55rem; min-width: 48px; min-height: 48px; } .nav-toggle span { display: block; width: 24px; height: 3px; background: var(--text); margin: 4px 0; border-radius: 3px; } .theme-toggle { border: 1px solid var(--border); background: var(--surface); color: var(--text); border-radius: 999px; min-height: 48px; padding: 0.45rem 0.8rem; display: inline-flex; align-items: center; gap: 0.35rem; font-weight: 700; } /* ------------------------------ Hero ------------------------------ */ .hero { position: relative; display: grid; align-items: end; min-height: min(74vh, 760px); border-radius: 1.5rem; overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow); padding: 0; background: linear-gradient(125deg, #123a58, #0e2c44); } .hero-media { position: absolute; inset: 0; background: linear-gradient(125deg, #123a58, #0e2c44); } .hero-video { width: 100%; height: 100%; object-fit: cover; } .hero-overlay { position: absolute; inset: 0; background: linear-gradient(120deg, rgba(6, 20, 35, 0.78), rgba(8, 33, 48, 0.36)), radial-gradient(circle at 80% 20%, rgba(20, 184, 166, 0.16), transparent 38%); } .hero-content { position: relative; z-index: 1; padding: clamp(1.2rem, 2vw, 2rem); max-width: min(72ch, 100%); } .tag { display: inline-block; background: color-mix(in srgb, var(--secondary) 36%, transparent); color: #f6fdff; border: 1px solid color-mix(in srgb, #9df8ef 65%, transparent); border-radius: 999px; padding: 0.35rem 0.8rem; font-weight: 700; } .hero h1 { /* clamp() keeps the heading large on desktop, but scales it down smoothly on smaller screens without a media query. */ font-size: clamp(2rem, 1.6rem + 2vw, 3.2rem); margin-bottom: 0.8rem; color: #f4faff; } .hero-intro { max-width: 55ch; color: #d9eefb; } .hero-actions { margin-top: 1.3rem; display: flex; flex-wrap: wrap; gap: 0.8rem; } /* ------------------------------ Components ------------------------------ */ .card-grid { display: grid; gap: 1rem; } .three-up { grid-template-columns: repeat(3, minmax(0, 1fr)); } .two-up { grid-template-columns: repeat(2, minmax(0, 1fr)); } .stack { grid-template-columns: 1fr; } .card { background: var(--surface); border: 1px solid var(--border); border-radius: 1.2rem; padding: 1.1rem; box-shadow: var(--shadow); } .lesson-layout { display: grid; grid-template-columns: 1.2fr 1fr; gap: 1rem; margin-bottom: 1rem; } .video-wrap { position: relative; width: 100%; aspect-ratio: 16 / 9; border-radius: 1rem; overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow); } .video-wrap iframe { width: 100%; height: 100%; border: 0; } .btn { border: 0; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; min-height: 48px; min-width: 48px; padding: 0.65rem 1rem; border-radius: 0.85rem; font-weight: 700; transition: transform 0.2s ease, box-shadow 0.2s ease; } .btn:hover { transform: translateY(-2px); } .btn:active { transform: translateY(0); } .btn-primary, .btn-small { background: linear-gradient(135deg, var(--primary), #249efc); color: #fff; } .btn-secondary { background: linear-gradient(135deg, var(--secondary), #16c7b3); color: #062b27; } .btn-ghost { background: color-mix(in srgb, var(--surface) 82%, var(--primary) 18%); color: var(--text); border: 1px solid var(--border); } .learn-list { padding-left: 1.2rem; } .quiz fieldset { border: 1px solid var(--border); border-radius: 0.8rem; padding: 0.7rem; margin-bottom: 0.8rem; } .quiz label { display: block; margin-top: 0.35rem; } .quiz-result { min-height: 1.5rem; margin-top: 0.7rem; font-weight: 700; } .activity-feedback { min-height: 1.6rem; margin-top: 0.7rem; font-weight: 700; color: var(--muted); } .chips { display: flex; flex-wrap: wrap; gap: 0.55rem; } .chip { border: 1px solid var(--border); background: color-mix(in srgb, var(--surface) 75%, var(--secondary) 25%); padding: 0.6rem 0.8rem; border-radius: 999px; min-height: 44px; cursor: pointer; } .chip.active { background: color-mix(in srgb, var(--secondary) 36%, var(--surface)); border-color: var(--secondary); } .selection-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.55rem; margin-bottom: 0.7rem; } .selection-grid label { display: flex; align-items: center; gap: 0.45rem; border: 1px solid var(--border); border-radius: 0.7rem; padding: 0.45rem; background: color-mix(in srgb, var(--surface) 82%, var(--bg-2) 18%); } .bulb-display { margin-top: 0.7rem; min-height: 120px; display: grid; place-items: center; } .bulb { width: 70px; height: 90px; border-radius: 48% 48% 42% 42%; border: 3px solid var(--border); background: linear-gradient(180deg, #f6f7f9, #dde5eb); position: relative; transition: box-shadow 0.3s ease, background 0.3s ease; } .bulb::after { content: ""; position: absolute; width: 30px; height: 18px; left: 50%; transform: translateX(-50%); bottom: -16px; border-radius: 0 0 8px 8px; background: #9caab7; } .bulb.on { /* Radial gradient fades from white at the center out to warm yellow, mimicking the glow of a real incandescent bulb. The box-shadow adds the diffuse light spreading outward. */ background: radial-gradient(circle at 50% 30%, #fff8b4, #ffd251 80%); box-shadow: 0 0 26px #ffd251; } .button-row { display: flex; gap: 0.6rem; flex-wrap: wrap; } .heart-zone { min-height: 90px; display: grid; place-items: center; margin-top: 0.8rem; } .beat-visual { margin-top: 0.8rem; padding: 0.7rem; border: 1px solid var(--border); border-radius: 0.9rem; background: color-mix(in srgb, var(--surface) 84%, var(--bg-2) 16%); } .beat-lights { display: flex; gap: 0.55rem; margin-top: 0.5rem; } .beat-light { width: 2rem; height: 2rem; border-radius: 999px; display: inline-flex; align-items: center; justify-content: center; font-weight: 700; border: 1px solid var(--border); background: color-mix(in srgb, var(--surface) 80%, var(--bg-2) 20%); } .beat-light.active { background: linear-gradient(140deg, var(--accent), #ffd77d); color: #1b2734; box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent); } .heart { width: 56px; aspect-ratio: 1; background: #f0476d; transform: rotate(-45deg); position: relative; border-radius: 8px; transition: filter 0.2s ease; } .heart::before, .heart::after { content: ""; position: absolute; width: 56px; height: 56px; border-radius: 50%; background: #f0476d; } .heart::before { top: -28px; left: 0; } .heart::after { top: 0; left: 28px; } .heart.pulse { animation: heartbeat 0.5s ease; filter: drop-shadow(0 0 10px rgba(240, 71, 109, 0.55)); } @keyframes heartbeat { 0% { transform: rotate(-45deg) scale(1); } 40% { transform: rotate(-45deg) scale(1.12); } 100% { transform: rotate(-45deg) scale(1); } } .site-footer { border-top: 1px solid var(--border); text-align: center; padding: 2rem 1rem 2.5rem; } .site-footer nav { display: flex; justify-content: center; flex-wrap: wrap; gap: 1rem; } /* ------------------------------ Reveal Animations ------------------------------ Sections start hidden and slightly shifted downward. When JavaScript adds .visible (via IntersectionObserver), the transition runs and slides them into place. */ .reveal { opacity: 0; transform: translateY(12px); transition: opacity 0.55s ease, transform 0.55s ease; } .reveal.visible { opacity: 1; transform: translateY(0); } /* ------------------------------ Accessibility / Focus ------------------------------ We remove the default browser outline and replace it with a custom box-shadow ring that matches the design. This keeps keyboard navigation visible without the ugly default rectangle. The prefers-reduced-motion block collapses all animations and transitions for users who have that system preference turned on. */ button, input, a { outline: none; } button:focus-visible, input:focus-visible, a:focus-visible { box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 30%, transparent); border-radius: 0.6rem; } @media (prefers-reduced-motion: reduce) { * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; } } /* ------------------------------ Responsive ------------------------------ At 980px the multi-column grids collapse to a single column so everything stacks nicely on tablets. The hamburger button also appears here — on desktop it's hidden (display: none). At 560px we fine-tune a few spacings for smaller phones. */ @media (max-width: 980px) { .hero, .lesson-layout, .three-up, .two-up { grid-template-columns: 1fr; } .hero { min-height: 58vh; } .nav-toggle { display: inline-block; } .nav-links { position: absolute; left: 0; right: 0; top: 100%; background: var(--surface); border-bottom: 1px solid var(--border); padding: 0.6rem 1rem 1rem; display: none; flex-direction: column; } .nav-links.open { display: flex; } } @media (max-width: 560px) { .section { padding-top: 3.8rem; } .hero { min-height: 62vh; } .hero-video { opacity: 0.74; } .selection-grid { grid-template-columns: 1fr; } }