:root {
  --bg: #0f172a;
  --text: #e5e7eb;
  --card: rgba(255, 255, 255, 0.08);
  --accent: #6366f1;
}

.light {
  --bg: #f8fafc;
  --text: #0f172a;
  --card: #ffffff;
}

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

body {
  font-family: "Inter", sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.3s, color 0.3s;
}
a {
  color: inherit;
  text-decoration: none;
}

.navbar {
  display: flex;
  justify-content: space-between;
  padding: 1rem 2rem;
  backdrop-filter: blur(10px);
}

.nav-links {
  display: flex;
  gap: 1rem;
  list-style: none;
}

.nav-links a {
  color: var(--text);
  text-decoration: none;
}

.hero {
  padding: 5rem 2rem;
  text-align: center;
}

.btn {
  background: var(--accent);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  display: inline-block;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  padding: 2rem;
}

.card {
  background: var(--card);
  padding: 1.5rem;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.container {
  max-width: 900px;
  margin: auto;
  padding: 2rem;
}

footer {
  text-align: center;
  padding: 2rem;
  opacity: 0.7;
}

.animate {
  opacity: 0;
  transform: translateY(20px);
  transition: 0.6s ease;
}

.animate.show {
  opacity: 1;
  transform: translateY(0);
}

/* =========================
   INDEX PAGE STYLES
   ========================= */

/* HERO SECTION */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 6rem 1.5rem;
  background: radial-gradient(
    circle at top,
    rgba(99, 102, 241, 0.25),
    transparent 60%
  );
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  max-width: 900px;
}

.hero p {
  margin-top: 1.2rem;
  max-width: 600px;
  font-size: 1.1rem;
  opacity: 0.85;
}

.hero .btn {
  margin-top: 2rem;
  font-size: 1rem;
  padding: 0.9rem 2rem;
  box-shadow: 0 10px 25px rgba(99, 102, 241, 0.35);
}

/* FEATURES SECTION */
.features {
  position: relative;
  padding: 4rem 2rem;
}

.features::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    transparent,
    rgba(0, 0, 0, 0.25),
    transparent
  );
  pointer-events: none;
}

.features .card {
  position: relative;
  overflow: hidden;
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.features .card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    transparent,
    rgba(255, 255, 255, 0.08),
    transparent
  );
  opacity: 0;
  transition: opacity 0.4s ease;
}

.features .card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

.features .card:hover::after {
  opacity: 1;
}

.features h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.features p {
  opacity: 0.8;
  font-size: 0.95rem;
}

/* CTA SECTION */
.cta {
  margin: 4rem 2rem 2rem;
  padding: 3.5rem 2rem;
  border-radius: 24px;
  text-align: center;
  background: linear-gradient(
    135deg,
    rgba(99, 102, 241, 0.25),
    rgba(139, 92, 246, 0.25)
  );
  backdrop-filter: blur(14px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.cta h2 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-bottom: 1.5rem;
}

.cta .btn.secondary {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: var(--text);
}

.cta .btn.secondary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* RESPONSIVE TWEAKS */
@media (max-width: 768px) {
  .hero {
    min-height: 80vh;
  }

  .features {
    padding: 3rem 1.5rem;
  }

  .cta {
    padding: 2.5rem 1.5rem;
  }
}

/* =========================
   ABOUT PAGE STYLES
   ========================= */

/* Main Container Enhancement */
.container {
  position: relative;
}

.container h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin-bottom: 1rem;
  font-weight: 700;
}

.container > p {
  max-width: 700px;
  font-size: 1.05rem;
  opacity: 0.85;
  margin-bottom: 3rem;
}

/* Section Headings */
.container h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 1rem;
  position: relative;
  padding-left: 1rem;
}

.container h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 4px;
  height: 60%;
  background: var(--accent);
  border-radius: 4px;
  transform: translateY(-50%);
}

/* Paragraph under headings */
.container h2 + p {
  max-width: 650px;
  opacity: 0.85;
  line-height: 1.7;
}

/* Mission List */
.container ul {
  margin-top: 1.2rem;
  max-width: 650px;
  list-style: none;
  padding-left: 0;
  display: grid;
  gap: 1rem;
}

.container ul li {
  position: relative;
  padding: 1rem 1.2rem 1rem 3rem;
  background: var(--card);
  border-radius: 14px;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.container ul li::before {
  content: "✓";
  position: absolute;
  left: 1.2rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  font-weight: 700;
}

.container ul li:hover {
  transform: translateY(-4px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.35);
}

/* Subtle Background Accent */
.container::after {
  content: "";
  position: absolute;
  inset: auto -20% -20% -20%;
  height: 300px;
  background: radial-gradient(
    circle,
    rgba(99, 102, 241, 0.18),
    transparent 70%
  );
  z-index: -1;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  .container h1 {
    text-align: center;
  }

  .container > p {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
  }

  .container h2 {
    margin-top: 2rem;
  }
}

/* =========================
   CONTACT PAGE STYLES
   ========================= */

#contactForm {
  margin-top: 2.5rem;
  max-width: 520px;
  display: grid;
  gap: 1.4rem;
  padding: 2.2rem;
  border-radius: 20px;
  background: var(--card);
  backdrop-filter: blur(14px);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35);
}

/* Input & Textarea */
#contactForm input,
#contactForm textarea {
  width: 100%;
  padding: 0.9rem 1rem;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 0.95rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s;
}

#contactForm textarea {
  resize: vertical;
  min-height: 120px;
}

/* Placeholder */
#contactForm ::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

/* Focus State */
#contactForm input:focus,
#contactForm textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.1);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.35);
}

/* Submit Button */
#contactForm .btn {
  margin-top: 0.5rem;
  width: 100%;
  padding: 0.9rem;
  font-size: 1rem;
  border-radius: 14px;
}

/* Validation Message */
#formMsg {
  margin-top: 0.8rem;
  font-size: 0.9rem;
  text-align: center;
  min-height: 1.2em;
}

/* Success & Error States */
#formMsg.success {
  color: #22c55e;
}

#formMsg.error {
  color: #ef4444;
}

/* Subtle Background Accent */
.container::after {
  content: "";
  position: absolute;
  inset: auto -30% -25% -30%;
  height: 260px;
  background: radial-gradient(
    circle,
    rgba(99, 102, 241, 0.22),
    transparent 70%
  );
  z-index: -1;
}

/* Responsive */
@media (max-width: 768px) {
  #contactForm {
    padding: 1.8rem 1.5rem;
  }
}

/* =========================
   PLACEHOLDER STYLES
   ========================= */

/* Default placeholder */
#contactForm input::placeholder,
#contactForm textarea::placeholder {
  color: rgba(255, 255, 255, 0.55);
  opacity: 1; /* penting untuk Safari */
}

/* Light mode placeholder */
.light #contactForm input::placeholder,
.light #contactForm textarea::placeholder {
  color: rgba(15, 23, 42, 0.55);
}

/* Focus state (lebih subtle saat user mengetik) */
input:focus::placeholder,
textarea:focus::placeholder {
  opacity: 0.35;
  transition: opacity 0.2s ease;
}

/* Cross-browser support */
::-webkit-input-placeholder {
  color: rgba(255, 255, 255, 0.55);
}

.light ::-webkit-input-placeholder {
  color: rgba(15, 23, 42, 0.55);
}

:-ms-input-placeholder {
  color: rgba(255, 255, 255, 0.55);
}

.light :-ms-input-placeholder {
  color: rgba(15, 23, 42, 0.55);
}