/* =========================================================
   KalkulatorHub — style.css
   Base tokens, reset, typography, utilities, generic sections
   ========================================================= */

/* ---------- Design tokens ---------- */
:root {
  /* Surfaces */
  --bg: #0b0e14;
  --bg-elevated: #10141c;
  --surface: #161b25;
  --surface-hover: #1c222e;
  --border: #262c3a;
  --border-soft: #1d2330;

  /* Text */
  --text-primary: #eceef3;
  --text-secondary: #98a0b3;
  --text-tertiary: #5b6376;

  /* Accents */
  --accent-gold: #e8b04b;
  --accent-gold-soft: rgba(232, 176, 75, 0.14);
  --accent-teal: #49c9b8;
  --accent-teal-soft: rgba(73, 201, 184, 0.14);

  /* Category tints */
  --cat-keuangan: #e8b04b;
  --cat-kesehatan: #e2637b;
  --cat-matematika: #49c9b8;
  --cat-kendaraan: #7c8cf8;
  --cat-pendidikan: #7bc08a;
  --cat-umum: #9099ad;

  /* Type */
  --font-display: "Sora", "Segoe UI", sans-serif;
  --font-body: "Plus Jakarta Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "Courier New", monospace;

  /* Scale */
  --fs-hero: clamp(2.4rem, 5vw + 1rem, 4.2rem);
  --fs-h2: clamp(1.7rem, 2.6vw + 0.6rem, 2.6rem);
  --fs-h3: 1.15rem;
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --fs-mono-label: 0.75rem;

  /* Spacing / shape */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --container: 1180px;
  --section-pad: clamp(3.5rem, 6vw, 6.5rem);

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.35s;
}

/* Light theme override (secondary, opt-in via toggle) */
:root[data-theme="light"] {
  --bg: #f6f5f1;
  --bg-elevated: #ffffff;
  --surface: #ffffff;
  --surface-hover: #f0efea;
  --border: #e4e1d8;
  --border-soft: #eae7de;
  --text-primary: #16181d;
  --text-secondary: #565b66;
  --text-tertiary: #8a8f99;
  --accent-gold-soft: rgba(232, 176, 75, 0.16);
  --accent-teal-soft: rgba(73, 201, 184, 0.16);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition:
    background var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0;
  color: var(--text-primary);
}
p {
  margin: 0;
}
ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
a {
  color: inherit;
  text-decoration: none;
}
img,
svg {
  display: block;
  max-width: 100%;
}
button {
  font-family: inherit;
  cursor: pointer;
}

::selection {
  background: var(--accent-gold);
  color: #0b0e14;
}

/* Focus visibility (accessibility) */
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent-teal);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.section {
  padding-block: var(--section-pad);
}
.section--tight {
  padding-block: calc(var(--section-pad) * 0.6);
}
.section--elevated {
  background: var(--bg-elevated);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono-label);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-teal);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 2.25rem;
  flex-wrap: wrap;
}

.section-head h2 {
  font-size: var(--fs-h2);
  letter-spacing: -0.01em;
}

.link-arrow {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--accent-teal);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: gap var(--dur) var(--ease);
}
.link-arrow:hover {
  gap: 0.6rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition:
    transform var(--dur) var(--ease),
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}
.btn:hover {
  transform: translateY(-2px);
}
.btn--solid {
  background: var(--accent-gold);
  color: #14100a;
}
.btn--solid:hover {
  background: #f0bd63;
}
.btn--outline {
  border-color: var(--border);
  color: var(--text-primary);
}
.btn--outline:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
}

.tag {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-label);
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition:
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}
.tag:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
  background: var(--accent-teal-soft);
}

/* ---------- SEO text section ---------- */
.about-text {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
}
.about-text h2 {
  font-size: var(--fs-h2);
  margin-bottom: 1rem;
  max-width: 20ch;
}
.about-text p {
  color: var(--text-secondary);
  max-width: 52ch;
}
.about-text p + p {
  margin-top: 0.9rem;
}

/* ---------- Scroll reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.6s var(--ease),
    transform 0.6s var(--ease);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- CTA banner ---------- */
.cta-banner {
  position: relative;
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(2rem, 4vw, 3.5rem);
  background: var(--bg-elevated);
  overflow: hidden;
}
.cta-banner::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 10px;
  background: radial-gradient(
      circle at 10px 0,
      transparent 6px,
      var(--bg) 6.5px
    )
    top left / 20px 10px repeat-x;
}
.cta-banner__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}
.cta-banner__eyebrow {
  color: var(--accent-gold);
}
.cta-banner h2 {
  font-size: var(--fs-h2);
  max-width: 22ch;
  margin-top: 0.75rem;
}
.cta-banner p {
  color: var(--text-secondary);
  max-width: 40ch;
  margin-top: 0.85rem;
}
.cta-banner__actions {
  display: flex;
  gap: 0.75rem;
}