/* tanso.center - Warm Educational Carbon Center */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --warm-ivory: #FAFAF0;
    --rich-black: #1A1A10;
    --gold-primary: #C8A84C;
    --gold-light: #E8D080;
    --gold-dark: #8A6A20;
    --text-inverted: #F0EDE0;
    --surface-card: #F0EBD8;
    --accent-label: #8A7A50;
}
body {
    background: var(--warm-ivory);
    color: var(--rich-black);
    font-family: 'Nunito Sans', sans-serif;
    font-size: 1.0625rem;
    line-height: 1.7;
    font-weight: 400;
    overflow-x: hidden;
}

/* Hero */
#hero {
    min-height: 70vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    padding: 4rem 2rem;
}
.carbon-ring {
    position: absolute;
    top: 10%;
    right: 10%;
    width: 200px;
    height: 200px;
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    border: 2px solid var(--gold-primary);
    opacity: 0.08;
    animation: ringRotate 60s linear infinite;
}
@keyframes ringRotate {
    to { transform: rotate(360deg); }
}
.hero-title {
    font-family: 'Outfit', sans-serif;
    font-size: clamp(2rem, 4.5vw, 3.8rem);
    font-weight: 600;
    color: var(--gold-primary);
}
.hero-meta {
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    color: var(--gold-dark);
    margin-top: 0.5rem;
}
.gold-arrow {
    width: 0;
    height: 0;
    border-left: 15px solid transparent;
    border-right: 15px solid transparent;
    border-top: 20px solid var(--gold-primary);
    opacity: 0.2;
    margin-top: 3rem;
    animation: arrowPulse 3s ease-in-out infinite;
}
@keyframes arrowPulse {
    0%, 100% { opacity: 0.15; }
    50% { opacity: 0.25; }
}

/* Flow Sections */
.flow-section {
    padding: clamp(3rem, 6vw, 6rem) 2rem;
    position: relative;
}
.flow-wide {
    width: 100%;
    background: var(--surface-card);
    clip-path: ellipse(70% 100% at 50% 50%);
}
.flow-narrow {
    width: 85%;
    margin: 0 auto;
}
.flow-medium {
    width: 90%;
    margin: 0 auto;
}
.flow-dark {
    background: var(--rich-black);
}
.section-inner {
    max-width: 960px;
    margin: 0 auto;
}
.section-title {
    font-family: 'Outfit', sans-serif;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 600;
    color: var(--rich-black);
    margin-bottom: 1.5rem;
}
.dark-title { color: var(--gold-primary); }
.body-text {
    font-size: 1.0625rem;
    color: var(--rich-black);
    margin-bottom: 1rem;
}
.dark-text { color: var(--text-inverted); }
.data-point {
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    color: var(--accent-label);
    display: block;
    margin-top: 1.5rem;
}
.gold-text { color: var(--gold-primary); font-weight: 500; }

/* Section animation */
.section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.section.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Footer */
#footer {
    text-align: center;
    padding: 3rem 2rem;
    border-top: 1px solid rgba(200,168,76,0.2);
}
.footer-text {
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
    color: var(--accent-label);
}

/* Responsive */
@media (max-width: 700px) {
    .flow-wide { clip-path: none; }
    .flow-narrow, .flow-medium { width: 100%; }
}