/* --- Design System --- */
:root {
  --primary-color: #2e7d32; /* Forest Green */
  --primary-dark: #1b5e20;
  --secondary-color: #1a1a1a; /* Professional Black */
  --accent-color: #ffd600; /* Attention Yellow */
  --text-color: #333333;
  --light-bg: #f5f5f5;
  --white: #ffffff;
  --transition: all 0.3s ease;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--white);
  overflow-x: hidden;
}

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

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

/* --- Layout --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

section {
  padding: 80px 0;
  overflow: hidden;
}

@media (max-width: 768px) {
  section {
    padding: 50px 0;
  }
}

/* --- Typography --- */
h1, h2, h3 {
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
}

.text-center {
  text-align: center;
}

/* --- Components --- */
.btn {
  display: inline-block;
  padding: 18px 40px;
  background-color: var(--accent-color);
  color: var(--secondary-color);
  font-weight: 800;
  font-size: 1.2rem;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 1px;
  box-shadow: 0 10px 30px rgba(255, 214, 0, 0.3);
  transition: var(--transition);
  cursor: pointer;
  border: none;
  animation: pulse 2s infinite;
}

.price {
  font-size: 3rem;
  color: var(--accent-color);
  font-weight: 900;
  margin: 10px 0 20px;
  text-shadow: 2px 2px 10px rgba(0,0,0,0.3);
}

.price span {
  font-size: 1.2rem;
  font-weight: 400;
  margin-left: 10px;
}

.btn:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(255, 214, 0, 0.5);
  background-color: #ffea00;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

/* --- Section 1: FV --- */
#fv {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  padding: 0;
}

.fv-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.fv-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.6);
}

.fv-content {
  max-width: 800px;
  text-align: center;
  z-index: 1;
}

.fv-content h1 {
  font-size: 3.5rem;
  margin-bottom: 30px;
  text-shadow: 2px 2px 10px rgba(0,0,0,0.5);
}

@media (max-width: 768px) {
  .fv-content h1 {
    font-size: 2.2rem;
  }
}

/* --- Section 2: Authority --- */
#authority {
  background-color: var(--light-bg);
}

.authority-grid {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
}

.authority-img {
  flex: 1;
  min-width: 300px;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.authority-text {
  flex: 1;
  min-width: 300px;
}

.authority-text h2 {
  color: var(--primary-color);
  font-size: 2rem;
}

/* --- Section 3: Problem --- */
#problem {
  background-color: var(--secondary-color);
  color: var(--white);
}

.problem-list {
  list-style: none;
  max-width: 600px;
  margin: 40px auto 0;
  text-align: left;
}

.problem-list li {
  padding: 15px 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
}

.problem-list li::before {
  content: '✕';
  color: #ff5252;
  margin-right: 20px;
  font-weight: bold;
}

/* --- Section 4: Features --- */
.feature-item {
  display: flex;
  align-items: center;
  gap: 60px;
  margin-bottom: 80px;
}

.feature-item:nth-child(even) {
  flex-direction: row-reverse;
}

.feature-img {
  flex: 1;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.feature-text {
  flex: 1;
}

.feature-text .point {
  display: inline-block;
  background-color: var(--primary-color);
  color: var(--white);
  padding: 5px 15px;
  border-radius: 5px;
  font-weight: bold;
  margin-bottom: 15px;
}

@media (max-width: 768px) {
  .feature-item, .feature-item:nth-child(even) {
    flex-direction: column;
    gap: 30px;
    margin-bottom: 60px;
  }
}

/* --- Section 5: Solution --- */
#solution {
  background-color: var(--light-bg);
}

.solution-img {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-top: 40px;
}

/* --- Section 6: Closing --- */
#closing {
  text-align: center;
}

.closing-img {
  max-width: 600px;
  margin: 40px auto;
  border-radius: 20px;
  box-shadow: var(--shadow);
}

footer {
  background-color: var(--secondary-color);
  color: #888;
  padding: 40px 0;
  text-align: center;
  font-size: 0.9rem;
}