@import url('https://fonts.googleapis.com/css2?family=Rubik+Mono+One&family=Poppins:wght@600&display=swap');

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

:root {
  --black: #000000;
  --white: #ffffff;
  --border: 4px solid var(--white);
  --border-black: 4px solid var(--black);
  --font-title: 'Rubik Mono One', monospace;
  --font-body: 'Poppins', sans-serif;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background: var(--black);
  color: var(--white);
  font-family: var(--font-body);
  font-weight: 600;
  overflow-x: hidden;
  cursor: none;
}

.custom-cursor {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  font-family: 'CMU Serif', 'Computer Modern', Georgia, serif;
  font-size: 22px;
  color: #fff;
  transform: translate(-50%, -50%);
  line-height: 1;
  mix-blend-mode: difference;
  user-select: none;
}

/* ── HERO ── */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
  border-bottom: var(--border);
}

.hero-left {
  position: relative;
  background: var(--black);
  border-right: var(--border);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.hero-stripe {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 28px,
    var(--white) 28px,
    var(--white) 52px
  );
  opacity: 1;
}

.hero-label-top {
  position: relative;
  z-index: 2;
  font-family: var(--font-title);
  font-size: clamp(0.85rem, 2vw, 1.1rem);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  padding: 1.2rem 1.5rem;
  background: var(--black);
  border-bottom: var(--border);
  width: 100%;
}

.hero-title-vertical {
  position: relative;
  z-index: 2;
  font-family: var(--font-title);
  font-size: clamp(3.5rem, 10vw, 8rem);
  text-transform: uppercase;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
  line-height: 0.85;
  letter-spacing: -0.02em;
  padding: 2rem 1rem;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  mix-blend-mode: difference;
}

.hero-label-bottom {
  position: relative;
  z-index: 2;
  font-family: var(--font-title);
  font-size: clamp(0.85rem, 2vw, 1.1rem);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  padding: 1.2rem 1.5rem;
  background: var(--black);
  border-top: var(--border);
  width: 100%;
}

.hero-right {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.hero-card {
  flex: 1;
  border-bottom: var(--border);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-card:last-child {
  border-bottom: none;
}

.hero-card-title {
  font-family: var(--font-title);
  font-size: clamp(1.2rem, 3vw, 2rem);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.hero-card-text {
  font-size: clamp(0.85rem, 1.5vw, 1rem);
  line-height: 1.6;
}

.hero-card-qr {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-title);
  font-size: clamp(3rem, 8vw, 6rem);
  letter-spacing: 0.1em;
}

/* ── SECCIONES ── */
section {
  border-bottom: var(--border);
}

.section-inner {
  padding: clamp(2rem, 6vw, 5rem) clamp(1.5rem, 5vw, 4rem);
}

/* ── EXPONENCIALES ── */
.exp-section {
  background: var(--white);
  color: var(--black);
}

.exp-section .section-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.section-title {
  font-family: var(--font-title);
  font-size: clamp(2rem, 6vw, 5rem);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 0.9;
  margin-bottom: 1.5rem;
}

.section-text {
  font-size: clamp(0.9rem, 1.5vw, 1.05rem);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.formula-block {
  background: var(--black);
  color: var(--white);
  padding: 1.5rem 2rem;
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  display: inline-block;
  border: var(--border-black);
}

.exp-section .formula-block {
  border: 4px solid var(--black);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-title);
  font-size: 0.95rem;
}

.data-table th,
.data-table td {
  border: 3px solid var(--black);
  padding: 0.6rem 1rem;
  text-align: center;
}

.data-table th {
  background: var(--black);
  color: var(--white);
}

.data-table td {
  background: var(--white);
  color: var(--black);
}

/* ── LOGARITMICAS ── */
.log-section {
  background: var(--black);
  color: var(--white);
}

.log-section .section-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.log-content .section-title,
.log-content .section-text {
  display: block;
}

.log-formula {
  background: var(--white);
  color: var(--black);
  padding: 1.5rem 2rem;
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  display: inline-block;
}

.data-table-dark th,
.data-table-dark td {
  border: 3px solid var(--white);
}

.data-table-dark th {
  background: var(--white);
  color: var(--black);
}

.data-table-dark td {
  background: var(--black);
  color: var(--white);
}

/* ── GRÁFICAS ── */
.graphs-section {
  background: var(--black);
  color: var(--white);
}

.graphs-section .section-inner {
  padding-top: clamp(2rem, 5vw, 4rem);
  padding-bottom: clamp(2rem, 5vw, 4rem);
}

.graphs-header {
  font-family: var(--font-title);
  font-size: clamp(1.5rem, 4vw, 3rem);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2rem;
  border-bottom: var(--border);
  padding-bottom: 1rem;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.slider-label {
  font-family: var(--font-title);
  font-size: 1.1rem;
  white-space: nowrap;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  background: var(--white);
  height: 4px;
  width: 200px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--black);
  border: 3px solid var(--white);
  cursor: pointer;
}

.base-display {
  font-family: var(--font-title);
  font-size: 1.4rem;
  min-width: 2rem;
}

.graphs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.graph-box {
  border: var(--border);
  padding: 1.5rem;
}

.graph-label {
  font-family: var(--font-title);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--white);
}

/* ── FOOTER / AUTORES ── */
.footer-section {
  background: var(--black);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: var(--border);
}

.author-block {
  padding: 2rem 2.5rem;
  font-family: var(--font-title);
  font-size: clamp(1rem, 3vw, 1.8rem);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
}

.author-block:first-child {
  border-right: var(--border);
}

.author-block.mirrored {
  justify-content: flex-end;
}

/* ── KATEX ── */
.katex {
  font-size: 1.3em !important;
}

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-left {
    min-height: 50vh;
    border-right: none;
    border-bottom: var(--border);
  }

  .hero-title-vertical {
    font-size: clamp(3rem, 15vw, 5rem);
  }

  .exp-section .section-inner,
  .log-section .section-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .graphs-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .author-block:first-child {
    border-right: none;
    border-bottom: var(--border);
  }

  .author-block.mirrored {
    transform: none;
  }
}