/* ============================================================
mathroom — shared design system
Fonts are NOT loaded here: each page keeps its own
+ Google Fonts in ,
so this file has something to apply itself to as soon as
it parses. Every page should link:
https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Mono:wght@400;500&family=DM+Sans:wght@300;400;500&display=swap
Per-app accent: each page sets ONE line to pick its topic
color, e.g. :root { --accent: var(--accent-3); }
Numbers and Operations -> --accent-1 (blue)
Geometry -> --accent-3 (green)
Algebra -> --accent-2 (red)
Statistics/Probability -> --accent-4 (purple)
============================================================ */
:root {
--black: #0d0d0d;
--grey-900: #1a1a1a;
--grey-700: #444;
--grey-400: #999;
--grey-200: #e8e8e8;
--grey-100: #f4f4f4;
--white: #ffffff;
--accent-1: #2563eb; /* blue — Numbers and Operations */
--accent-2: #e63946; /* red — Algebra */
--accent-3: #16a34a; /* green — Geometry */
--accent-4: #7c3aed; /* purple — Statistics and Probability */
--accent: var(--accent-1); /* per-page override */
--accent-red: rgba(220, 38, 38, 0.75); /* fixed decorative red, independent of topic accent */
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; height: 100%; }
body {
font-family: 'DM Sans', sans-serif;
background: var(--white);
color: var(--black);
min-height: 100vh;
display: flex;
flex-direction: column;
}
/* ---------- nav ---------- */
nav {
position: sticky;
top: 0;
z-index: 100;
display: flex;
align-items: center;
justify-content: space-between;
padding: 0 3rem;
height: 60px;
background: rgba(255,255,255,0.92);
backdrop-filter: blur(10px);
border-bottom: 1px solid var(--grey-200);
}
.nav-logo {
font-family: 'DM Mono', monospace;
font-size: 0.9rem;
font-weight: 500;
letter-spacing: 0.06em;
color: var(--black);
text-decoration: none;
display: flex;
align-items: center;
gap: 8px;
}
.nav-logo-dot {
width: 8px; height: 8px;
background: var(--accent);
border-radius: 50%;
flex-shrink: 0;
}
.nav-back {
display: flex;
align-items: center;
gap: 8px;
font-family: 'DM Mono', monospace;
font-size: 0.75rem;
letter-spacing: 0.06em;
color: var(--grey-400);
text-decoration: none;
transition: color 0.2s;
}
.nav-back:hover { color: var(--black); }
.nav-links {
display: flex;
gap: 2rem;
list-style: none;
}
.nav-links a {
font-size: 0.85rem;
font-weight: 400;
color: var(--grey-700);
text-decoration: none;
letter-spacing: 0.02em;
transition: color 0.2s;
}
.nav-links a:hover { color: var(--black); }
.nav-back svg {
width: 14px; height: 14px;
stroke: currentColor; fill: none;
stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round;
transition: transform 0.2s;
}
.nav-back:hover svg { transform: translateX(-3px); }
/* ---------- page header (per-app intro block) ---------- */
.page-header {
max-width: 1200px;
margin: 0 auto;
width: 100%;
padding: 3.5rem 3rem 2rem;
animation: fadeUp 0.5s ease both;
}
.page-label {
font-family: 'DM Mono', monospace;
font-size: 0.7rem;
letter-spacing: 0.14em;
text-transform: uppercase;
color: var(--accent);
margin-bottom: 0.75rem;
display: flex;
align-items: center;
gap: 10px;
}
.page-label::before {
content: '';
display: inline-block;
width: 24px; height: 1px;
background: var(--accent);
}
.page-title {
font-family: 'DM Serif Display', serif;
font-size: clamp(2rem, 4vw, 3.2rem);
line-height: 1.1;
letter-spacing: -0.02em;
margin-bottom: 0.75rem;
}
.page-desc {
font-size: 0.9rem;
color: var(--grey-400);
font-weight: 300;
max-width: 560px;
line-height: 1.65;
}
/* short competency-style learning-objective line, under the description */
.page-objective {
display: flex;
gap: 10px;
align-items: baseline;
max-width: 560px;
margin-top: 1rem;
font-size: 0.82rem;
line-height: 1.6;
color: var(--grey-700);
}
.page-objective-label {
flex-shrink: 0;
font-family: 'DM Mono', monospace;
font-size: 0.65rem;
letter-spacing: 0.1em;
text-transform: uppercase;
color: var(--grey-400);
}
/* ---------- footer ---------- */
footer {
border-top: 1px solid var(--grey-200);
padding: 1.5rem 3rem;
background: var(--grey-100);
margin-top: auto;
}
.footer-bottom {
max-width: 1200px;
margin: 0 auto;
display: flex;
justify-content: space-between;
align-items: center;
gap: 1rem;
flex-wrap: wrap;
}
.footer-bottom p {
font-size: 0.75rem;
color: var(--grey-400);
font-family: 'DM Mono', monospace;
}
/* ---------- shared affordance utility ----------
Applied to DOM-based interactive controls (buttons, range
inputs, real SVG handles) so "clickable/draggable" stays
unambiguous under a flat visual style. Canvas-drawn controls
(geoboard pins, etc.) need their own JS-driven hover/active
drawing state instead — this class can't reach into canvas. */
.affordance {
transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
cursor: pointer;
}
.affordance:hover { transform: scale(1.06); }
.affordance:active { transform: scale(0.96); }
.affordance:focus-visible {
outline: 2px solid var(--accent);
outline-offset: 2px;
}
/* ---------- animations ---------- */
@keyframes fadeUp {
from { opacity: 0; transform: translateY(16px); }
to { opacity: 1; transform: translateY(0); }
}
/* ============================================================
Landing-page gallery (index.html only)
============================================================ */
header {
padding: 7rem 3rem 5rem;
max-width: 1200px;
margin: 0 auto;
width: 100%;
position: relative;
animation: fadeUp 0.6s ease both;
}
.hero-label {
font-family: 'DM Mono', monospace;
font-size: 0.75rem;
letter-spacing: 0.14em;
text-transform: uppercase;
color: var(--accent-1);
margin-bottom: 1.5rem;
display: flex;
align-items: center;
gap: 10px;
}
.hero-label::before {
content: '';
display: inline-block;
width: 28px; height: 1px;
background: var(--accent-1);
}
h1 {
font-family: 'DM Serif Display', serif;
font-size: clamp(3rem, 6vw, 5.5rem);
line-height: 1.05;
letter-spacing: -0.02em;
color: var(--black);
max-width: 720px;
margin-bottom: 2rem;
}
h1 em { font-style: italic; color: var(--grey-400); }
.hero-body {
font-size: 1.1rem;
line-height: 1.75;
color: var(--grey-700);
max-width: 540px;
font-weight: 300;
}
.hero-rule {
display: grid;
grid-template-columns: 1fr 1fr 1fr 1fr;
gap: 6px;
position: absolute;
right: 3rem;
top: 7rem;
width: 160px;
opacity: 0.18;
}
.hero-rule span {
display: block;
aspect-ratio: 1;
border-radius: 50%;
background: var(--black);
}
.gallery-section {
padding: 3rem 3rem 6rem;
max-width: 1200px;
margin: 0 auto;
width: 100%;
flex: 1;
}
.section-header {
display: flex;
align-items: baseline;
gap: 1.5rem;
margin-bottom: 2.5rem;
border-top: 1px solid var(--grey-200);
padding-top: 2rem;
}
.section-title {
font-family: 'DM Mono', monospace;
font-size: 0.75rem;
letter-spacing: 0.12em;
text-transform: uppercase;
color: var(--grey-400);
}
.section-count {
font-family: 'DM Mono', monospace;
font-size: 0.75rem;
color: var(--grey-200);
}
.category-group { margin-bottom: 3rem; }
.category-group:last-child { margin-bottom: 0; }
.category-label {
display: flex;
align-items: center;
gap: 10px;
font-family: 'DM Mono', monospace;
font-size: 0.78rem;
font-weight: 500;
letter-spacing: 0.1em;
text-transform: uppercase;
color: var(--black);
margin-bottom: 1rem;
}
.category-dot {
width: 8px; height: 8px;
border-radius: 50%;
background: var(--card-accent, var(--accent-1));
flex-shrink: 0;
}
.category-count {
font-weight: 400;
color: var(--grey-400);
letter-spacing: 0.04em;
}
.gallery {
display: grid;
grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
gap: 1.5rem;
align-items: start;
}
.app-card {
display: flex;
flex-direction: column;
text-decoration: none;
background: var(--white);
border: 1px solid var(--grey-200);
position: relative;
overflow: hidden;
cursor: pointer;
transition: border-color 0.2s, box-shadow 0.2s;
animation: fadeUp 0.5s ease both;
}
.app-card:hover { border-color: var(--grey-400); box-shadow: 0 6px 20px rgba(13,13,13,0.08); }
.app-card:hover .card-arrow { opacity: 1; transform: translate(0, 0); }
.app-card:hover .card-thumb img { transform: scale(1.03); }
.app-card:hover .card-accent-bar { width: 100%; }
.c1 { --card-accent: var(--accent-1); }
.c2 { --card-accent: var(--accent-2); }
.c3 { --card-accent: var(--accent-3); }
.c4 { --card-accent: var(--accent-4); }
.card-accent-bar {
position: absolute;
top: 0; left: 0;
height: 3px;
width: 0;
background: var(--card-accent, var(--accent-1));
transition: width 0.35s ease;
z-index: 2;
}
.card-thumb {
position: relative;
width: 100%;
aspect-ratio: 4 / 3;
overflow: hidden;
background: var(--grey-100);
flex-shrink: 0;
}
.card-thumb img {
width: 100%;
height: 100%;
object-fit: cover;
object-position: center;
transition: transform 0.4s ease;
opacity: 0.95;
display: block;
}
.card-content {
padding: 1.5rem 1.5rem 1.1rem;
background: var(--white);
display: flex;
flex-direction: column;
}
.card-tag-row {
display: flex;
align-items: center;
gap: 0.5rem;
margin-bottom: 0.5rem;
}
.card-mode-badge {
display: inline-flex;
align-items: center;
gap: 4px;
font-family: 'DM Mono', monospace;
font-size: 0.6rem;
letter-spacing: 0.08em;
text-transform: uppercase;
color: var(--grey-400);
border: 1px solid var(--grey-200);
border-radius: 3px;
padding: 2px 6px;
}
.card-mode-badge svg {
width: 10px; height: 10px;
stroke: currentColor; fill: none;
stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.card-title {
font-family: 'DM Serif Display', serif;
font-size: 1.35rem;
color: var(--black);
line-height: 1.2;
margin-bottom: 0.4rem;
display: -webkit-box;
-webkit-line-clamp: 2;
-webkit-box-orient: vertical;
overflow: hidden;
}
/* description shows as a hover/focus reveal over the thumbnail,
instead of a fixed line on the card (avoids clipping at any
card width, and any length of copy is fine) */
.card-tooltip {
position: absolute;
inset: 0;
display: flex;
align-items: center;
justify-content: center;
padding: 1.25rem;
background: rgba(13,13,13,0.86);
color: var(--white);
font-size: 0.85rem;
line-height: 1.55;
font-weight: 300;
text-align: center;
opacity: 0;
transition: opacity 0.2s ease;
pointer-events: none;
}
.app-card:hover .card-tooltip,
.app-card:focus-visible .card-tooltip {
opacity: 1;
}
.card-arrow {
position: absolute;
top: 1.25rem;
right: 1.25rem;
width: 32px; height: 32px;
border: 1px solid var(--grey-200);
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
opacity: 0;
transform: translate(-6px, 6px);
transition: opacity 0.25s, transform 0.25s;
background: white;
z-index: 3;
}
.card-arrow svg {
width: 14px; height: 14px;
stroke: var(--black);
fill: none;
stroke-width: 1.5;
stroke-linecap: round;
stroke-linejoin: round;
}
.app-card.placeholder { pointer-events: none; opacity: 0.4; }
.placeholder .card-title { color: var(--grey-400); }
/* impressum / privacy modal (index.html only) */
.modal-overlay {
display: none;
position: fixed;
inset: 0;
background: rgba(0,0,0,0.5);
z-index: 200;
align-items: center;
justify-content: center;
padding: 2rem;
}
.modal-overlay.open { display: flex; }
.modal {
background: white;
max-width: 560px;
width: 100%;
padding: 3rem;
position: relative;
max-height: 85vh;
overflow-y: auto;
}
.modal h2 {
font-family: 'DM Serif Display', serif;
font-size: 1.8rem;
margin-bottom: 1.5rem;
}
.modal p, .modal address {
font-size: 0.875rem;
line-height: 1.75;
color: var(--grey-700);
font-style: normal;
margin-bottom: 1rem;
}
.modal-close {
position: absolute;
top: 1.25rem; right: 1.25rem;
background: none; border: none;
font-size: 1.4rem; cursor: pointer;
color: var(--grey-400);
line-height: 1;
transition: color 0.2s;
}
.modal-close:hover { color: var(--black); }
.btn-link {
background: none; border: none; padding: 0;
font-family: 'DM Mono', monospace;
font-size: 0.75rem;
color: var(--grey-400);
cursor: pointer;
text-decoration: underline;
text-underline-offset: 3px;
}
.btn-link:hover { color: var(--black); }
/* ---------- responsive ---------- */
@media (max-width: 700px) {
nav { padding: 0 1.5rem; }
header, .gallery-section, .page-header, main, footer { padding-left: 1.5rem; padding-right: 1.5rem; }
h1 { font-size: 2.6rem; }
.hero-rule { display: none; }
footer { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.footer-bottom { flex-direction: column; align-items: flex-start; }
}