/* DisposableEnergy.com — ink and energy theme, shared lineage with MercantileMonopoly.com */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; color: #1c1917; line-height: 1.7; background: #faf8f4; }
a { color: #1e3a8a; text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 880px; margin: 0 auto; padding: 0 16px; }
.container ul { margin: 12px 0 12px 28px; }
.container li { margin-bottom: 8px; color: #44403c; }
.container p { margin-bottom: 16px; }

.hero { background: linear-gradient(160deg, #0f172a 0%, #1e293b 50%, #1e3a8a 100%); color: #fff; text-align: center; padding: 56px 16px 44px; }
.hero h1 { font-family: Georgia, serif; font-size: 2.6em; font-weight: 700; margin-bottom: 12px; line-height: 1.15; }
.hero h1 span { color: #fbbf24; }
.hero .tagline { font-size: 1.1em; font-weight: 300; color: rgba(255,255,255,0.85); max-width: 680px; margin: 0 auto; }

section { padding: 44px 0; border-bottom: 1px solid #e7e5e4; }
section .year { font-family: Georgia, serif; font-size: 0.95em; font-weight: 700; color: #1e3a8a; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 4px; }
section h2 { font-family: Georgia, serif; font-size: 1.8em; font-weight: 400; margin-bottom: 14px; }
section h2 span { color: #1e3a8a; }
section p.lead { font-size: 1.06em; color: #44403c; max-width: 740px; margin-bottom: 20px; }

.reading { margin: 8px 0 24px; }
.reading .big { font-family: Georgia, serif; font-size: 4em; font-weight: 700; color: #1e3a8a; line-height: 1; }
.reading .sub { color: #57534e; font-size: 0.95em; margin-top: 6px; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 16px 0; }
.card { background: #fff; border: 1px solid #e7e5e4; border-radius: 8px; padding: 18px 20px; }
.card h3 { font-size: 0.85em; text-transform: uppercase; letter-spacing: 1px; color: #57534e; margin-bottom: 6px; }
.card p { margin-bottom: 4px; font-size: 0.92em; color: #57534e; }
.card p.num { font-family: Georgia, serif; font-size: 1.6em; color: #1c1917; }

pre.formula { background: #f1f5f9; border-left: 4px solid #1e293b; padding: 16px 20px; margin: 16px 0 20px; overflow-x: auto; font-size: 0.9em; border-radius: 0 8px 8px 0; }

figure { margin: 24px 0; }
figure img { width: 100%; height: auto; display: block; border-radius: 8px; background: #fff; }
figure figcaption { font-size: 0.85em; color: #78716c; margin-top: 8px; }

footer { padding: 28px 0; font-size: 0.88em; color: #78716c; }