/* =========================================================
FAKTA SAINS LANDING PAGE
Clean CSS Version
========================================================= */

/* =========================

1. RESET & BASE
   ========================= */

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

html {
scroll-behavior: smooth;
}

body {
margin: 0;
font-family:
"Nunito",
"Trebuchet MS",
system-ui,
-apple-system,
BlinkMacSystemFont,
sans-serif;
color: #25324b;
background:
radial-gradient(circle at top left, rgba(255, 238, 154, 0.45), transparent 32rem),
radial-gradient(circle at top right, rgba(143, 215, 255, 0.4), transparent 34rem),
linear-gradient(180deg, #f7fcff 0%, #fffaf0 48%, #f5fff7 100%);
line-height: 1.6;
overflow-x: hidden;
}

img {
display: block;
max-width: 100%;
}

a {
color: inherit;
text-decoration: none;
}

button,
input,
textarea {
font: inherit;
}

button {
cursor: pointer;
}

/* =========================
2. VARIABLES
========================= */

:root {
--blue: #2f80ed;
--blue-dark: #173b7a;
--blue-soft: #8fd7ff;
--blue-light: #e8f7ff;

--yellow: #ffe58a;
--yellow-soft: #fff4c4;

--green: #69c779;
--green-soft: #e8f8df;

--pink: #ff8ab3;
--pink-soft: #ffe6ef;

--orange: #ff9f43;
--orange-soft: #fff0dc;

--purple: #8d6bff;
--purple-soft: #efe9ff;

--white: #ffffff;
--cream: #fffaf0;

--text: #25324b;
--muted: #63708a;

--border: rgba(47, 128, 237, 0.16);
--shadow: 0 20px 60px rgba(23, 59, 122, 0.12);
--shadow-soft: 0 12px 30px rgba(23, 59, 122, 0.08);

--radius-sm: 14px;
--radius-md: 22px;
--radius-lg: 34px;
--radius-xl: 44px;

--container: 1160px;
}

/* =========================
3. GLOBAL LAYOUT
========================= */

.container {
width: min(100% - 32px, var(--container));
margin-inline: auto;
}

.section {
position: relative;
padding: 92px 0;
}

.section-soft {
background:
linear-gradient(135deg, rgba(232, 247, 255, 0.84), rgba(255, 250, 240, 0.88)),
radial-gradient(circle at 8% 12%, rgba(255, 229, 138, 0.55), transparent 20rem),
radial-gradient(circle at 92% 80%, rgba(232, 248, 223, 0.72), transparent 18rem);
border-top: 1px solid rgba(47, 128, 237, 0.08);
border-bottom: 1px solid rgba(47, 128, 237, 0.08);
}

.section-heading {
max-width: 720px;
margin: 0 auto 42px;
text-align: center;
}

.section-heading.left {
margin-inline: 0;
text-align: left;
}

.section-heading h2,
.feature-content h2,
.buy-content h2 {
margin: 0 0 16px;
color: var(--blue-dark);
font-size: clamp(2rem, 4vw, 3.3rem);
line-height: 1.08;
letter-spacing: -0.04em;
}

.section-heading p,
.feature-content p,
.buy-content p {
margin: 0;
color: var(--muted);
font-size: 1.05rem;
}

.eyebrow {
display: inline-flex;
align-items: center;
gap: 8px;
width: fit-content;
margin: 0 0 16px;
padding: 8px 14px;
color: var(--blue-dark);
font-weight: 900;
font-size: 0.88rem;
border-radius: 999px;
background: var(--yellow-soft);
border: 1px solid rgba(255, 159, 67, 0.22);
}

/* =========================
4. BACKGROUND DECORATION
========================= */

.page-bg {
position: fixed;
inset: 0;
z-index: -1;
pointer-events: none;
overflow: hidden;
}

.bubble {
position: absolute;
display: block;
border-radius: 999px;
filter: blur(1px);
opacity: 0.45;
}

.bubble-1 {
width: 170px;
height: 170px;
left: -60px;
top: 120px;
background: var(--blue-soft);
}

.bubble-2 {
width: 210px;
height: 210px;
right: -80px;
top: 420px;
background: var(--yellow);
}

.bubble-3 {
width: 130px;
height: 130px;
left: 8%;
bottom: 90px;
background: var(--green-soft);
}

.bubble-4 {
width: 180px;
height: 180px;
right: 14%;
bottom: -70px;
background: var(--pink-soft);
}

/* =========================
5. HEADER & NAVIGATION
========================= */

.site-header {
position: sticky;
top: 0;
z-index: 50;
background: rgba(255, 255, 255, 0.78);
backdrop-filter: blur(18px);
border-bottom: 1px solid rgba(47, 128, 237, 0.12);
}

.header-inner {
min-height: 82px;
display: flex;
align-items: center;
justify-content: space-between;
gap: 24px;
}

.brand {
display: inline-flex;
align-items: center;
gap: 12px;
}

.brand-logo {
width: auto;
height: 48px;
object-fit: contain;
}

.brand-text {
display: flex;
flex-direction: column;
line-height: 1.15;
}

.brand-name {
color: var(--blue-dark);
font-weight: 1000;
font-size: 1.12rem;
letter-spacing: -0.03em;
}

.brand-tagline {
color: var(--muted);
font-weight: 800;
font-size: 0.78rem;
}

.site-nav {
display: flex;
align-items: center;
gap: 8px;
}

.site-nav a {
padding: 10px 14px;
color: #40506b;
font-weight: 850;
font-size: 0.94rem;
border-radius: 999px;
transition: 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
color: var(--blue-dark);
background: var(--blue-light);
}

.site-nav .nav-cta {
color: var(--white);
background: var(--blue);
box-shadow: 0 10px 22px rgba(47, 128, 237, 0.24);
}

.site-nav .nav-cta:hover {
color: var(--white);
background: var(--blue-dark);
}

.nav-toggle {
display: none;
width: 48px;
height: 48px;
border: 0;
border-radius: 16px;
background: var(--blue-light);
}

.nav-toggle span {
display: block;
width: 22px;
height: 3px;
margin: 4px auto;
border-radius: 999px;
background: var(--blue-dark);
}

/* =========================
6. BUTTONS
========================= */

.btn {
display: inline-flex;
align-items: center;
justify-content: center;
gap: 10px;
min-height: 52px;
padding: 14px 22px;
border-radius: 999px;
font-weight: 950;
line-height: 1;
text-align: center;
transition:
transform 0.2s ease,
box-shadow 0.2s ease,
background 0.2s ease,
color 0.2s ease;
}

.btn:hover {
transform: translateY(-3px);
}

.btn-primary {
color: var(--white);
background: linear-gradient(135deg, var(--blue), #59b8ff);
box-shadow: 0 14px 30px rgba(47, 128, 237, 0.28);
}

.btn-primary:hover {
box-shadow: 0 18px 36px rgba(47, 128, 237, 0.34);
}

.btn-secondary {
color: var(--blue-dark);
background: var(--white);
border: 1px solid var(--border);
box-shadow: var(--shadow-soft);
}

/* =========================
7. HERO SECTION
========================= */

.hero {
min-height: calc(100vh - 82px);
display: flex;
align-items: center;
padding-top: 82px;
}

.hero-grid {
display: grid;
grid-template-columns: 1.02fr 0.98fr;
align-items: center;
gap: 56px;
}

.hero-content h1 {
margin: 0 0 22px;
color: var(--blue-dark);
font-size: clamp(2.6rem, 6vw, 5.2rem);
line-height: 0.98;
letter-spacing: -0.06em;
}

.hero-content h1 span {
color: #ff6f61;
}

.hero-desc {
max-width: 620px;
margin: 0 0 30px;
color: var(--muted);
font-size: 1.12rem;
}

.hero-actions {
display: flex;
flex-wrap: wrap;
gap: 14px;
margin-bottom: 32px;
}

.hero-points {
display: grid;
grid-template-columns: repeat(3, minmax(0, 1fr));
gap: 14px;
max-width: 620px;
}

.hero-points div {
padding: 16px;
border-radius: var(--radius-md);
background: rgba(255, 255, 255, 0.78);
border: 1px solid var(--border);
box-shadow: var(--shadow-soft);
}

.hero-points strong {
display: block;
color: var(--blue-dark);
font-size: 1.2rem;
line-height: 1.1;
}

.hero-points span {
display: block;
margin-top: 4px;
color: var(--muted);
font-weight: 800;
font-size: 0.82rem;
}

.hero-visual {
position: relative;
min-width: 0;
}

.hero-card {
padding: 18px;
border-radius: var(--radius-xl);
background:
linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(255, 250, 240, 0.92)),
radial-gradient(circle at top, rgba(255, 229, 138, 0.34), transparent 18rem);
border: 1px solid var(--border);
box-shadow: var(--shadow);
}

.hero-cover-stack {
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
align-items: start;
gap: 14px;
}

.hero-cover-stack img {
width: 100%;
height: auto;
object-fit: contain;
object-position: center;
border: 3px solid var(--white);
border-radius: 20px;
background: var(--white);
box-shadow: var(--shadow-soft);
transition: 0.25s ease;
}

.hero-cover-stack img:hover {
transform: rotate(-1deg) scale(1.03);
}

.hero-note {
display: flex;
align-items: center;
gap: 14px;
margin-top: 18px;
padding: 16px;
border-radius: 24px;
background: var(--blue-light);
}

.note-icon {
flex: 0 0 auto;
display: grid;
place-items: center;
width: 48px;
height: 48px;
border-radius: 18px;
background: var(--white);
font-size: 1.4rem;
}

.hero-note p {
margin: 0;
color: var(--blue-dark);
font-weight: 850;
}

.floating-badge {
position: absolute;
z-index: 2;
padding: 10px 14px;
border-radius: 999px;
font-weight: 950;
box-shadow: var(--shadow-soft);
border: 3px solid var(--white);
animation: floatBadge 4s ease-in-out infinite;
}

.badge-blue {
top: 8%;
left: -18px;
color: var(--blue-dark);
background: var(--blue-light);
}

.badge-yellow {
top: 46%;
right: -20px;
color: #815000;
background: var(--yellow);
animation-delay: 0.8s;
}

.badge-green {
left: 10%;
bottom: -18px;
color: #19532b;
background: var(--green-soft);
animation-delay: 1.4s;
}

@keyframes floatBadge {
0%,
100% {
transform: translateY(0) rotate(-2deg);
}

50% {
transform: translateY(-12px) rotate(2deg);
}
}

/* =========================
8. MINI INFO CARDS
========================= */

.mini-info {
padding: 42px 0;
}

.mini-info-grid {
display: grid;
grid-template-columns: repeat(3, minmax(0, 1fr));
gap: 18px;
}

.mini-card {
padding: 24px;
border-radius: var(--radius-lg);
background: var(--white);
border: 1px solid var(--border);
box-shadow: var(--shadow-soft);
}

.mini-card span {
display: grid;
place-items: center;
width: 56px;
height: 56px;
margin-bottom: 16px;
border-radius: 20px;
background: var(--yellow-soft);
font-size: 1.6rem;
}

.mini-card h3,
.series-card h3,
.feature-item h3,
.step-card h3,
.testimonial-card h3,
.tab-card h3 {
margin: 0 0 8px;
color: var(--blue-dark);
line-height: 1.2;
}

.mini-card p,
.series-card p,
.feature-item p,
.step-card p,
.testimonial-card p,
.tab-card p {
margin: 0;
color: var(--muted);
}

/* =========================
9. SERIES SECTION
========================= */

.series-grid {
display: grid;
grid-template-columns: repeat(4, minmax(0, 1fr));
gap: 20px;
}

.series-card {
position: relative;
overflow: hidden;
padding: 14px;
border-radius: var(--radius-lg);
background: var(--white);
border: 1px solid var(--border);
box-shadow: var(--shadow-soft);
transition: 0.24s ease;
}

.series-card:hover {
transform: translateY(-8px);
box-shadow: var(--shadow);
}

.series-card-image {
position: relative;
overflow: hidden;
border-radius: 20px;
background: var(--white);
}

.series-card-image img {
width: 100%;
height: auto;
object-fit: contain;
object-position: center;
border-radius: 18px;
transition: 0.3s ease;
}

.series-card:hover .series-card-image img {
transform: scale(1.03);
}

.series-badge {
position: absolute;
top: 12px;
left: 12px;
padding: 8px 12px;
color: var(--white);
background: var(--blue);
border-radius: 999px;
font-weight: 950;
box-shadow: var(--shadow-soft);
}

.series-card-body {
padding: 18px 6px 4px;
}

.series-card h3 {
font-size: 1.22rem;
}

.series-topics {
display: flex;
flex-wrap: wrap;
gap: 8px;
margin: 16px 0 18px;
padding: 0;
list-style: none;
}

.series-topics li {
padding: 6px 10px;
color: var(--blue-dark);
font-weight: 850;
font-size: 0.78rem;
background: var(--blue-light);
border-radius: 999px;
}

.series-card .btn {
width: 100%;
min-height: 46px;
font-size: 0.9rem;
}

/* =========================
10. FEATURE / FORMULA SECTION
========================= */

.feature-grid {
display: grid;
grid-template-columns: minmax(420px, 0.9fr) minmax(480px, 1fr);
align-items: center;
gap: 44px;
}

.feature-content,
.feature-panel,
.science-window,
.science-scene {
min-width: 0;
}

.feature-list {
display: grid;
gap: 16px;
margin-top: 28px;
}

.feature-item {
display: flex;
gap: 16px;
padding: 18px;
border-radius: var(--radius-md);
background: var(--white);
border: 1px solid var(--border);
box-shadow: var(--shadow-soft);
}

.feature-item span {
flex: 0 0 auto;
display: grid;
place-items: center;
width: 42px;
height: 42px;
color: var(--white);
background: var(--blue);
border-radius: 15px;
font-weight: 1000;
}

.feature-panel {
width: 100%;
max-width: 680px;
justify-self: end;
padding: 18px;
border-radius: var(--radius-xl);
background:
radial-gradient(circle at top left, rgba(255, 229, 138, 0.58), transparent 16rem),
var(--white);
box-shadow: var(--shadow);
border: 1px solid var(--border);
}

.science-window {
overflow: hidden;
border-radius: 30px;
background: var(--blue-light);
border: 1px solid rgba(47, 128, 237, 0.12);
}

.window-top {
display: flex;
gap: 8px;
padding: 16px;
background: var(--white);
}

.window-top span {
width: 13px;
height: 13px;
border-radius: 50%;
background: var(--pink);
}

.window-top span:nth-child(2) {
background: var(--yellow);
}

.window-top span:nth-child(3) {
background: var(--green);
}

.science-scene {
position: relative;
min-height: 330px;
display: grid;
grid-template-columns: 100px 1fr 100px;
grid-template-areas:
"beaker title magnify"
". formula ."
". star .";
align-items: center;
justify-items: center;
gap: 18px;
padding: 38px 30px;
text-align: center;
}

.science-scene .beaker,
.science-scene .magnify,
.science-scene .star {
position: static;
display: grid;
place-items: center;
width: 86px;
height: 86px;
border-radius: 28px;
background: var(--white);
box-shadow: var(--shadow-soft);
font-size: 2.4rem;
}

.science-scene .beaker {
grid-area: beaker;
transform: rotate(-8deg);
}

.science-scene .magnify {
grid-area: magnify;
transform: rotate(8deg);
}

.science-scene .star {
grid-area: star;
width: 78px;
height: 78px;
font-size: 2.2rem;
transform: rotate(-5deg);
}

.science-scene h3 {
grid-area: title;
margin: 0;
max-width: 100%;
color: var(--blue-dark);
font-size: clamp(2.1rem, 3.4vw, 2.85rem);
line-height: 1.1;
letter-spacing: -0.04em;
white-space: normal;
}

.science-scene p {
grid-area: formula;
max-width: 420px;
margin: 0;
padding: 14px 22px;
color: #65728d;
font-weight: 900;
font-size: 1.05rem;
line-height: 1.5;
background: rgba(255, 255, 255, 0.58);
border: 1px solid rgba(47, 128, 237, 0.1);
border-radius: 999px;
}

/* =========================
   11. TABS SECTION
========================= */

.content-tabs {
  max-width: 1000px;
  margin: 0 auto 34px;
  padding: 12px;
  border-radius: var(--radius-xl);
  background: var(--white);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
}

.tab-buttons {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}

.tab-btn {
  min-height: 48px;
  padding: 12px 14px;
  color: var(--muted);
  font-weight: 950;
  border: 0;
  border-radius: 999px;
  background: var(--blue-light);
  transition: 0.2s ease;
}

.tab-btn.active {
  color: var(--white);
  background: var(--blue);
  box-shadow: 0 12px 24px rgba(47, 128, 237, 0.22);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.tab-card {
  overflow: hidden;
  border-radius: 30px;
  background:
    linear-gradient(135deg, rgba(255, 250, 240, 0.95), rgba(232, 247, 255, 0.95));
}

.tab-card-image {
  display: grid;
  grid-template-columns: 0.9fr 1fr;
  align-items: center;
  gap: 26px;
  padding: 22px;
}

.tab-image-wrap {
  overflow: hidden;
  border-radius: 24px;
  background: var(--white);
  border: 4px solid var(--white);
  box-shadow: var(--shadow-soft);
}

.tab-image-wrap img {
  width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center;
  border-radius: 20px;
}

.tab-text {
  padding: 12px 8px;
}

.tab-label {
  display: inline-flex;
  width: fit-content;
  margin-bottom: 14px;
  padding: 8px 14px;
  color: var(--blue-dark);
  background: var(--yellow-soft);
  border-radius: 999px;
  font-weight: 950;
}

.tab-text h3 {
  margin: 0 0 12px;
  color: var(--blue-dark);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.1;
}

.tab-text p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

/* =========================
12. TOPIC PREVIEW
========================= */

.topic-preview {
padding: 28px;
border-radius: var(--radius-xl);
background: var(--white);
border: 1px solid var(--border);
box-shadow: var(--shadow-soft);
}

.topic-header {
display: flex;
align-items: end;
justify-content: space-between;
gap: 20px;
margin-bottom: 20px;
}

.topic-header h3 {
margin: 0;
color: var(--blue-dark);
font-size: 1.5rem;
}

.topic-header p {
margin: 0;
color: var(--muted);
}

.topic-controls {
display: flex;
flex-wrap: wrap;
gap: 10px;
margin-bottom: 22px;
}

.topic-btn {
padding: 10px 15px;
border: 0;
border-radius: 999px;
color: var(--blue-dark);
background: var(--yellow-soft);
font-weight: 950;
transition: 0.2s ease;
}

.topic-btn.active {
color: var(--white);
background: var(--blue);
}

.topic-list {
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
gap: 12px;
}

.topic-item {
display: flex;
align-items: center;
gap: 12px;
min-height: 58px;
padding: 14px;
border-radius: 18px;
background: #f8fbff;
border: 1px solid rgba(47, 128, 237, 0.1);
}

.topic-number {
flex: 0 0 auto;
display: grid;
place-items: center;
width: 34px;
height: 34px;
color: var(--white);
background: var(--green);
border-radius: 12px;
font-weight: 1000;
}

.topic-text {
color: var(--text);
font-weight: 850;
}

/* =========================
13. STEPS SECTION
========================= */

.steps-grid {
display: grid;
grid-template-columns: 0.8fr 1.2fr;
gap: 38px;
align-items: start;
}

.steps-list {
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
gap: 18px;
}

.step-card {
padding: 24px;
border-radius: var(--radius-lg);
background: var(--white);
border: 1px solid var(--border);
box-shadow: var(--shadow-soft);
}

.step-card span {
display: inline-flex;
margin-bottom: 36px;
color: var(--blue);
font-weight: 1000;
font-size: 1.4rem;
}

/* =========================
14. TESTIMONIALS
========================= */

.testimonial-grid {
display: grid;
grid-template-columns: repeat(3, minmax(0, 1fr));
gap: 20px;
}

.testimonial-card {
padding: 26px;
border-radius: var(--radius-lg);
background: var(--white);
border: 1px solid var(--border);
box-shadow: var(--shadow-soft);
}

.stars {
margin-bottom: 14px;
color: #ffb000;
letter-spacing: 2px;
font-weight: 1000;
}

.testimonial-card p {
margin-bottom: 20px;
font-weight: 800;
}

/* =========================
15. FAQ SECTION
========================= */

.faq-grid {
display: grid;
grid-template-columns: 0.75fr 1.25fr;
gap: 38px;
align-items: start;
}

.faq-list {
display: grid;
gap: 14px;
}

.faq-item {
overflow: hidden;
border-radius: 24px;
background: var(--white);
border: 1px solid var(--border);
box-shadow: var(--shadow-soft);
}

.faq-question {
display: flex;
align-items: center;
justify-content: space-between;
gap: 18px;
width: 100%;
padding: 20px 22px;
border: 0;
color: var(--blue-dark);
background: var(--white);
font-weight: 950;
text-align: left;
}

.faq-question span {
flex: 0 0 auto;
display: grid;
place-items: center;
width: 34px;
height: 34px;
color: var(--white);
background: var(--blue);
border-radius: 50%;
transition: 0.2s ease;
}

.faq-answer {
max-height: 0;
overflow: hidden;
transition: max-height 0.25s ease;
}

.faq-answer p {
margin: 0;
padding: 0 22px 22px;
color: var(--muted);
}

.faq-item.active .faq-answer {
max-height: 220px;
}

.faq-item.active .faq-question span {
transform: rotate(45deg);
background: var(--pink);
}

/* =========================
   PRICING SECTION
========================= */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  align-items: stretch;
}

.pricing-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 26px;
  border-radius: var(--radius-lg);
  background: var(--white);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  transition: 0.24s ease;
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
}

.pricing-card-featured {
  border: 3px solid var(--blue);
  background:
    radial-gradient(circle at top right, rgba(255, 229, 138, 0.45), transparent 14rem),
    var(--white);
}

.pricing-label {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  width: max-content;
  max-width: calc(100% - 32px);
  padding: 8px 16px;
  color: var(--white);
  background: var(--blue);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 950;
  box-shadow: var(--shadow-soft);
}

.pricing-top {
  margin-bottom: 22px;
}

.pricing-icon {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  margin-bottom: 16px;
  border-radius: 20px;
  background: var(--blue-light);
  font-size: 1.7rem;
}

.pricing-top h3 {
  margin: 0 0 8px;
  color: var(--blue-dark);
  font-size: 1.45rem;
  line-height: 1.2;
}

.pricing-top p {
  margin: 0;
  color: var(--muted);
}

.pricing-price {
  padding: 18px;
  margin-bottom: 20px;
  border-radius: 24px;
  background: var(--yellow-soft);
}

.pricing-price span {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-weight: 850;
  font-size: 0.9rem;
}

.pricing-price strong {
  display: block;
  color: var(--blue-dark);
  font-size: clamp(1.8rem, 3vw, 2.35rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.pricing-list {
  display: grid;
  gap: 10px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.pricing-list li {
  position: relative;
  padding-left: 28px;
  color: var(--muted);
  font-weight: 800;
}

.pricing-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  color: var(--white);
  background: var(--green);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 1000;
}

.pricing-card .btn {
  width: 100%;
  margin-top: auto;
}

.pricing-note {
  margin: 24px auto 0;
  max-width: 720px;
  color: var(--muted);
  text-align: center;
  font-weight: 800;
}

/* =========================
   COUNTDOWN SECTION
========================= */

.countdown-section {
  position: relative;
  padding: 54px 0;
}

.countdown-card {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 30px;
  padding: 34px;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at top left, rgba(255, 229, 138, 0.55), transparent 18rem),
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(232, 247, 255, 0.96));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.countdown-content {
  max-width: 520px;
}

.countdown-content h2 {
  margin: 0 0 12px;
  color: var(--blue-dark);
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.countdown-content p {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
}

.countdown-box {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 18px;
  border-radius: 30px;
  background: var(--white);
  border: 1px solid rgba(47, 128, 237, 0.14);
  box-shadow: var(--shadow-soft);
}

.countdown-item {
  display: grid;
  place-items: center;
  min-width: 78px;
  padding: 14px 10px;
  border-radius: 22px;
  background: var(--blue-light);
}

.countdown-item strong {
  display: block;
  color: var(--blue-dark);
  font-size: clamp(1.8rem, 3vw, 2.45rem);
  line-height: 1;
  font-weight: 1000;
  letter-spacing: -0.04em;
}

.countdown-item span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 900;
}

.countdown-separator {
  color: var(--blue-dark);
  font-size: 2rem;
  font-weight: 1000;
}

.countdown-action {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-top: 22px;
  border-top: 1px dashed rgba(47, 128, 237, 0.22);
}

.countdown-action p {
  margin: 0;
  color: var(--blue-dark);
  font-weight: 900;
}

.countdown-card.is-ended {
  background:
    radial-gradient(circle at top left, rgba(255, 138, 179, 0.18), transparent 18rem),
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(255, 230, 239, 0.88));
}

.countdown-card.is-ended .countdown-item {
  background: var(--pink-soft);
}

.countdown-card.is-ended .countdown-action p {
  color: #b3315f;
}

/* Responsive Countdown */
@media (max-width: 1024px) {
  .countdown-card {
    grid-template-columns: 1fr;
  }

  .countdown-content {
    max-width: 100%;
    text-align: center;
  }

  .countdown-content .eyebrow {
    margin-inline: auto;
  }

  .countdown-action {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 620px) {
  .countdown-section {
    padding: 42px 0;
  }

  .countdown-card {
    padding: 20px;
    border-radius: 30px;
  }

  .countdown-box {
    width: 100%;
    gap: 6px;
    padding: 12px;
    border-radius: 24px;
  }

  .countdown-item {
    min-width: 0;
    flex: 1;
    padding: 12px 6px;
    border-radius: 18px;
  }

  .countdown-item strong {
    font-size: 1.45rem;
  }

  .countdown-item span {
    font-size: 0.7rem;
  }

  .countdown-separator {
    font-size: 1.3rem;
  }
}

/* =========================
16. BUY SECTION
========================= */

.buy-section {
padding-bottom: 54px;
}

.buy-card {
display: grid;
grid-template-columns: 1fr auto;
gap: 30px;
align-items: center;
padding: 38px;
border-radius: var(--radius-xl);
color: var(--white);
background:
radial-gradient(circle at top left, rgba(255, 229, 138, 0.62), transparent 18rem),
linear-gradient(135deg, #2f80ed, #76ccff);
box-shadow: 0 28px 70px rgba(47, 128, 237, 0.24);
}

.buy-content h2,
.buy-content p {
color: var(--white);
}

.buy-content .eyebrow {
color: var(--blue-dark);
background: var(--white);
}

.buy-actions {
display: flex;
flex-direction: column;
gap: 12px;
min-width: 260px;
}

.buy-actions .btn-secondary {
color: var(--blue-dark);
background: var(--white);
}

/* =========================
17. FLOATING WHATSAPP
========================= */

.floating-whatsapp {
position: fixed;
right: 22px;
bottom: 22px;
z-index: 60;
display: inline-flex;
align-items: center;
gap: 9px;
padding: 13px 16px;
color: var(--white);
background: #25d366;
border-radius: 999px;
box-shadow: 0 18px 40px rgba(37, 211, 102, 0.36);
font-weight: 1000;
border: 4px solid var(--white);
transition: 0.2s ease;
}

.floating-whatsapp:hover {
transform: translateY(-4px);
}

/* =========================
18. FOOTER
========================= */

.site-footer {
padding: 64px 0 26px;
color: #dfeaff;
background:
radial-gradient(circle at top left, rgba(143, 215, 255, 0.16), transparent 24rem),
linear-gradient(180deg, #173b7a, #10244b);
}

.footer-grid {
display: grid;
grid-template-columns: 1.2fr 0.7fr 0.7fr 0.9fr;
gap: 34px;
padding-bottom: 34px;
}

.footer-brand p,
.footer-contact p {
max-width: 360px;
margin: 18px 0 0;
color: rgba(223, 234, 255, 0.82);
}

.site-footer .brand-name {
color: var(--white);
}

.site-footer .brand-tagline {
color: rgba(223, 234, 255, 0.76);
}

.footer-links,
.footer-contact {
display: flex;
flex-direction: column;
align-items: flex-start;
}

.footer-links h3,
.footer-contact h3 {
margin: 0 0 14px;
color: var(--white);
}

.footer-links a {
display: inline-flex;
margin-bottom: 10px;
color: rgba(223, 234, 255, 0.82);
font-weight: 800;
}

.footer-links a:hover {
color: var(--yellow);
}

.footer-wa {
display: inline-flex;
margin-top: 16px;
padding: 11px 16px;
color: #0f4625;
background: #b8ffd2;
border-radius: 999px;
font-weight: 1000;
}

.footer-bottom {
display: flex;
justify-content: space-between;
gap: 20px;
padding-top: 22px;
border-top: 1px solid rgba(223, 234, 255, 0.14);
}

.footer-bottom p {
margin: 0;
color: rgba(223, 234, 255, 0.72);
font-size: 0.92rem;
}

/* =========================
19. ANIMATION
========================= */

.reveal {
opacity: 0;
transform: translateY(18px);
transition:
opacity 0.55s ease,
transform 0.55s ease;
}

.reveal.is-visible {
opacity: 1;
transform: translateY(0);
}

/* =========================
20. RESPONSIVE - TABLET
========================= */

@media (max-width: 820px) {
  .tab-buttons {
    grid-template-columns: 1fr;
  }

  .tab-card-image {
    grid-template-columns: 1fr;
  }

  .tab-text {
    padding: 4px;
  }
}

@media (max-width: 1100px) {
.feature-grid {
grid-template-columns: 1fr;
}

.feature-panel {
max-width: 760px;
justify-self: center;
}
}

@media (max-width: 1024px) {
.hero-grid,
.steps-grid,
.faq-grid {
grid-template-columns: 1fr;
}

.pricing-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.hero {
min-height: auto;
}

.series-grid {
grid-template-columns: repeat(2, minmax(0, 1fr));
}

.footer-grid {
grid-template-columns: repeat(2, minmax(0, 1fr));
}

.buy-card {
grid-template-columns: 1fr;
}

.buy-actions {
width: 100%;
min-width: 0;
}
}

/* =========================
21. RESPONSIVE - MOBILE NAV
========================= */

@media (max-width: 820px) {
.header-inner {
min-height: 72px;
}

.nav-toggle {
display: inline-block;
}

.site-nav {
position: absolute;
left: 16px;
right: 16px;
top: 82px;
display: none;
flex-direction: column;
align-items: stretch;
padding: 14px;
border-radius: 24px;
background: var(--white);
border: 1px solid var(--border);
box-shadow: var(--shadow);
}

.site-nav.is-open {
display: flex;
}

.site-nav a {
text-align: center;
}

.hero {
padding-top: 54px;
}

.hero-points,
.mini-info-grid,
.testimonial-grid,
.steps-list,
.topic-list {
grid-template-columns: 1fr;
}

.topic-header {
align-items: flex-start;
flex-direction: column;
}

.tab-buttons {
grid-template-columns: 1fr;
}

.tab-card {
grid-template-columns: 1fr;
}

.science-scene {
min-height: auto;
grid-template-columns: 1fr 1fr;
grid-template-areas:
"title title"
"formula formula"
"beaker magnify"
"star star";
padding: 34px 22px;
}
}

/* =========================
22. RESPONSIVE - SMALL MOBILE
========================= */

@media (max-width: 620px) {
.container {
width: min(100% - 22px, var(--container));
}

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

.pricing-card {
  padding: 22px;
}

.pricing-label {
  position: static;
  transform: none;
  margin: 0 auto 18px;
}

.section {
padding: 68px 0;
}

.brand-logo {
width: auto;
height: 40px;
}

.brand-name {
font-size: 1rem;
}

.brand-tagline {
display: none;
}

.hero-content h1 {
font-size: clamp(2.35rem, 13vw, 3.8rem);
}

.hero-desc {
font-size: 1rem;
}

.hero-actions,
.buy-actions {
flex-direction: column;
}

.btn {
width: 100%;
}

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

.hero-card {
padding: 12px;
border-radius: 30px;
}

.hero-cover-stack {
gap: 10px;
}

.hero-cover-stack img {
border: 2px solid var(--white);
border-radius: 16px;
}

.floating-badge {
display: none;
}

.section-heading h2,
.feature-content h2,
.buy-content h2 {
font-size: 2.05rem;
}

.content-tabs,
.topic-preview,
.buy-card {
padding: 18px;
border-radius: 28px;
}

.feature-grid {
gap: 28px;
}

.science-scene {
grid-template-columns: 1fr;
grid-template-areas:
"title"
"formula"
"beaker"
"magnify"
"star";
gap: 14px;
padding: 30px 18px;
}

.science-scene h3 {
font-size: 2rem;
}

.science-scene p {
border-radius: 24px;
font-size: 0.95rem;
}

.science-scene .beaker,
.science-scene .magnify,
.science-scene .star {
width: 68px;
height: 68px;
border-radius: 22px;
font-size: 2rem;
}

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

.footer-bottom {
flex-direction: column;
}

.floating-whatsapp {
right: 14px;
bottom: 14px;
}
}