/* UNLEARN — shared styles
   Chalkboard aesthetic. Variables defined once; all pages import this. */

:root {
    --chalk-white: #e8e4dc;
    --chalk-yellow: #f4d35e;
    --chalk-pink: #ee6c4d;
    --chalk-blue: #98c1d9;
    --chalk-green: #a7c957;
    --chalk-purple: #c9a0dc;
    --board-green: #2d4a3e;
    --board-dark: #1a2e26;
    --eraser-dust: rgba(232, 228, 220, 0.1);
    --red-pen: #c1121f;
}

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

body {
    font-family: 'Instrument Sans', sans-serif;
    background: var(--board-dark);
    min-height: 100vh;
    overflow-x: hidden;
    color: var(--chalk-white);
}

a { color: var(--chalk-yellow); text-decoration: none; }
a:hover { color: var(--chalk-pink); }

.chalkboard-texture {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(45, 74, 62, 0.8) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(45, 74, 62, 0.6) 0%, transparent 50%),
        linear-gradient(180deg, var(--board-dark) 0%, var(--board-green) 50%, var(--board-dark) 100%);
    z-index: -2;
}

.chalk-dust {
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.03;
    z-index: -1;
    pointer-events: none;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 24px 80px;
}

/* ---------- Nav ---------- */
.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0 24px;
    justify-content: center;
    padding: 24px 16px 0;
    font-family: 'Special Elite', monospace;
    font-size: 0.95rem;
}
.nav a {
    color: var(--chalk-white);
    opacity: 0.7;
    padding: 6px 4px;
    border-bottom: 2px dashed transparent;
    transition: opacity 0.2s, border-color 0.2s, color 0.2s;
}
.nav a:hover { opacity: 1; color: var(--chalk-yellow); border-bottom-color: var(--chalk-yellow); }
.nav a.active { color: var(--chalk-yellow); opacity: 1; border-bottom-color: var(--chalk-yellow); }
.nav .brand {
    font-family: 'Covered By Your Grace', cursive;
    font-size: 1.6rem;
    color: var(--chalk-white);
    opacity: 1;
    letter-spacing: 2px;
    margin-right: 12px;
}

/* ---------- Headings ---------- */
.h-chalk {
    font-family: 'Covered By Your Grace', cursive;
    color: var(--chalk-white);
    text-shadow: 2px 2px 0 rgba(0,0,0,0.3), -1px -1px 0 rgba(255,255,255,0.1);
    letter-spacing: 3px;
    line-height: 1.05;
}
h1.h-chalk { font-size: clamp(3rem, 9vw, 6rem); margin-bottom: 12px; }
h2.h-chalk { font-size: clamp(1.8rem, 4vw, 2.6rem); margin-bottom: 16px; }
h3.h-chalk { font-size: 1.6rem; margin-bottom: 10px; }

.tagline {
    font-family: 'Special Elite', monospace;
    font-size: 1.05rem;
    color: var(--chalk-yellow);
    opacity: 0.9;
}

@keyframes chalkWrite {
    from { opacity: 0; transform: translateY(20px); filter: blur(4px); }
    to { opacity: 1; transform: translateY(0); filter: blur(0); }
}

header.page-header {
    text-align: center;
    margin-bottom: 48px;
    animation: chalkWrite 1s ease-out;
}

/* ---------- Inputs / buttons ---------- */
.btn {
    font-family: 'Special Elite', monospace;
    font-size: 1.05rem;
    padding: 14px 28px;
    background: var(--chalk-pink);
    color: var(--board-dark);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}
.btn:hover { transform: scale(1.05); box-shadow: 0 4px 20px rgba(238, 108, 77, 0.4); }
.btn:active { transform: scale(0.98); }
.btn.btn-ghost {
    background: transparent;
    color: var(--chalk-white);
    border: 2px solid var(--chalk-white);
}
.btn.btn-ghost:hover { background: var(--chalk-white); color: var(--board-dark); }

.input-chalk {
    font-family: 'Special Elite', monospace;
    background: transparent;
    border: none;
    border-bottom: 3px solid var(--chalk-yellow);
    color: var(--chalk-yellow);
    padding: 8px 12px;
    outline: none;
    transition: border-color 0.3s;
}
.input-chalk:focus { border-bottom-color: var(--chalk-pink); }
.input-chalk::placeholder { color: rgba(244, 211, 94, 0.4); }

/* ---------- Cards (fact display) ---------- */
.fact-card {
    background: rgba(0, 0, 0, 0.15);
    border-left: 4px solid var(--chalk-blue);
    padding: 24px 28px;
    margin-bottom: 20px;
    position: relative;
    animation: slideIn 0.5s ease both;
}
.fact-card:nth-child(odd)  { border-left-color: var(--chalk-green); }
.fact-card:nth-child(3n)   { border-left-color: var(--chalk-pink); }
.fact-card:nth-child(5n)   { border-left-color: var(--chalk-purple); }

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-30px); }
    to   { opacity: 1; transform: translateX(0); }
}

.category-tag {
    font-family: 'Special Elite', monospace;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--chalk-yellow);
    margin-bottom: 10px;
    opacity: 0.85;
}

.old-fact {
    font-family: 'Special Elite', monospace;
    font-size: 1.05rem;
    color: var(--chalk-white);
    margin-bottom: 14px;
    position: relative;
    display: inline-block;
    max-width: 100%;
}
.old-fact::after {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 100%;
    height: 3px;
    background: var(--red-pen);
    transform: rotate(-1deg);
    opacity: 0.9;
}

.correction {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
}
.correction-arrow {
    color: var(--chalk-green);
    font-size: 1.4rem;
    line-height: 1;
    flex-shrink: 0;
}
.new-fact {
    font-family: 'Covered By Your Grace', cursive;
    font-size: 1.35rem;
    color: var(--chalk-green);
    line-height: 1.4;
}

.fact-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 14px;
    font-family: 'Instrument Sans', sans-serif;
    font-size: 0.78rem;
    color: var(--chalk-blue);
    opacity: 0.75;
}
.fact-meta .src { color: var(--chalk-white); opacity: 0.6; }

.surprise {
    display: inline-flex;
    gap: 2px;
    color: var(--chalk-yellow);
    font-size: 0.85rem;
}

/* ---------- Eraser effect ---------- */
.eraser-marks {
    position: fixed;
    pointer-events: none;
    z-index: 100;
}
.eraser-mark {
    position: absolute;
    background: var(--eraser-dust);
    border-radius: 50%;
    animation: eraseFade 2s ease-out forwards;
}
@keyframes eraseFade {
    0%   { opacity: 0.8; transform: scale(1); }
    100% { opacity: 0;   transform: scale(1.5); }
}

/* ---------- Footer ---------- */
footer.page-footer {
    text-align: center;
    margin-top: 80px;
    padding-top: 32px;
    border-top: 1px dashed rgba(232, 228, 220, 0.2);
}
.footer-text {
    font-family: 'Special Elite', monospace;
    font-size: 0.82rem;
    color: var(--chalk-white);
    opacity: 0.5;
}

/* ---------- Utility ---------- */
.loading {
    text-align: center;
    padding: 60px 20px;
    font-family: 'Special Elite', monospace;
    color: var(--chalk-white);
    opacity: 0.6;
}
.empty {
    text-align: center;
    padding: 60px 20px;
    font-family: 'Special Elite', monospace;
    color: var(--chalk-white);
    opacity: 0.7;
}
.grid {
    display: grid;
    gap: 18px;
}
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.fade-in { animation: chalkWrite 0.6s ease-out; }

@media (max-width: 600px) {
    .container { padding: 24px 16px 60px; }
    .nav { gap: 0 12px; font-size: 0.85rem; }
    .nav .brand { font-size: 1.3rem; }
    .fact-card { padding: 18px 20px; }
    .new-fact { font-size: 1.15rem; }
}