/* ===================================================
   KIM.AI - MINIMALIST & MODERN PORTFOLIO STYLES
   =================================================== */

:root {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(56, 189, 248, 0.3);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #cbd5e1;
  
  --accent-cyan: #38bdf8;
  --accent-indigo: #818cf8;
  --accent-blue: #2563eb;
  --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
  
  --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --container-width: 1040px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Ambient Background Glow */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(120px);
  opacity: 0.2;
}

.glow-top {
  width: 450px;
  height: 450px;
  top: -100px;
  right: -50px;
  background: radial-gradient(circle, var(--accent-cyan), transparent 70%);
}

.glow-bottom {
  width: 500px;
  height: 500px;
  bottom: 10%;
  left: -150px;
  background: radial-gradient(circle, var(--accent-indigo), transparent 70%);
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Typography */
h1, h2, h3, h4 {
  color: var(--text-main);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
}

p {
  color: var(--text-light);
  font-size: 1rem;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(9, 13, 22, 0.8);
  border-bottom: 1px solid var(--border-subtle);
  padding: 1rem 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.2rem;
}

.logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--accent-gradient);
  color: #090d16;
  border-radius: var(--radius-sm);
  font-weight: 800;
  font-size: 1rem;
}

.accent-dot {
  color: var(--accent-cyan);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--text-main);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn .icon {
  width: 18px;
  height: 18px;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #090d16;
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(56, 189, 248, 0.35);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-outline {
  background: transparent;
  color: var(--text-light);
  border-color: var(--border-subtle);
}

.btn-outline:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.btn-block {
  width: 100%;
}

/* Hero Section */
.hero-section {
  padding: 5rem 0 3.5rem;
}

.hero-content {
  max-width: 780px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  margin-bottom: 0.6rem;
  font-weight: 800;
}

.hero-role {
  font-size: clamp(1.15rem, 2.5vw, 1.45rem);
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 1.4rem;
}

.hero-desc {
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.7;
  color: var(--text-light);
  margin-bottom: 2.2rem;
  max-width: 680px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3.5rem;
}

.hero-highlights {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 1.4rem 1.8rem;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.highlight-item {
  display: flex;
  flex-direction: column;
}

.highlight-num {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
}

.highlight-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.highlight-divider {
  width: 1px;
  height: 36px;
  background: var(--border-subtle);
}

/* Sections */
.section {
  padding: 5rem 0;
}

.section-header {
  margin-bottom: 3rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 0.6rem;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  margin-bottom: 0.6rem;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 620px;
}

/* About Grid */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.about-card.main-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.2rem;
}

.card-heading {
  font-size: 1.4rem;
  color: var(--accent-cyan);
}

.about-features {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.feature-item {
  display: flex;
  gap: 1.2rem;
  padding: 1.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.feature-item:hover {
  border-color: var(--border-highlight);
  background: var(--bg-card-hover);
}

.feature-icon {
  width: 44px;
  height: 44px;
  min-width: 44px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 22px;
  height: 22px;
}

.feature-item h4 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.feature-item p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.skill-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
  transition: var(--transition);
}

.skill-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
}

.skill-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.1);
  margin-bottom: 0.8rem;
}

.skill-title {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

.skill-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Projects Section */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.project-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  transition: var(--transition);
}

.project-card:hover {
  border-color: var(--border-highlight);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.project-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.8rem;
}

.project-title {
  font-size: 1.35rem;
  margin-bottom: 1rem;
}

.project-desc {
  font-size: 1rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 1.4rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.tag {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Services & Pricing */
.pricing-container {
  max-width: 680px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  position: relative;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.popular-ribbon {
  position: absolute;
  top: -12px;
  right: 28px;
  background: var(--accent-gradient);
  color: #090d16;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-header {
  margin-bottom: 1.5rem;
}

.package-name {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

.package-target {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.price-box {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.price-value {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

.price-unit {
  font-size: 1.05rem;
  color: var(--text-muted);
  font-weight: 500;
}

.session-duration {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 1.8rem;
  font-weight: 500;
}

.benefits-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  margin-bottom: 2.2rem;
}

.benefits-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--text-light);
}

.check-icon {
  width: 20px;
  height: 20px;
  min-width: 20px;
  color: var(--accent-cyan);
  margin-top: 2px;
}

/* Contact Card */
.contact-card {
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.6) 0%, rgba(15, 23, 42, 0.8) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
}

.contact-title {
  font-size: clamp(1.8rem, 3.5vw, 2.3rem);
  margin-bottom: 1rem;
}

.contact-desc {
  font-size: 1.05rem;
  color: var(--text-light);
  max-width: 580px;
  margin: 0 auto 2.2rem;
  line-height: 1.7;
}

.contact-action-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 1.8rem;
}

.telegram-btn {
  display: inline-flex;
  align-items: center;
  gap: 1.2rem;
  background: #0f172a;
  border: 1px solid var(--border-highlight);
  padding: 1rem 1.6rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: var(--transition);
  max-width: 100%;
}

.telegram-btn:hover {
  background: #1e293b;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(56, 189, 248, 0.2);
}

.tele-icon-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #090d16;
}

.tele-icon-circle svg {
  width: 22px;
  height: 22px;
}

.tele-text {
  text-align: left;
  display: flex;
  flex-direction: column;
}

.tele-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.tele-handle {
  font-size: 1.15rem;
  color: var(--text-main);
  font-weight: 700;
}

.arrow-right {
  width: 22px;
  height: 22px;
  color: var(--accent-cyan);
}

.privacy-note {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.privacy-note svg {
  width: 16px;
  height: 16px;
  color: var(--accent-cyan);
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 2.5rem 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.hosting-badge {
  font-size: 0.8rem;
  color: var(--accent-cyan);
}

/* ===================================================
   RESPONSIVE DESIGN (XEM TỐT TRÊN ĐIỆN THOẠI)
   =================================================== */

@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(9, 13, 22, 0.96);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.2rem;
    display: none;
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-cta {
    width: 100%;
  }

  .hero-section {
    padding: 3.5rem 0 2.5rem;
  }

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

  .hero-actions .btn {
    width: 100%;
  }

  .hero-highlights {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.2rem;
  }

  .highlight-divider {
    display: none;
  }

  .pricing-card {
    padding: 2rem 1.4rem;
  }

  .contact-card {
    padding: 2.5rem 1.2rem;
  }

  .telegram-btn {
    padding: 0.85rem 1.2rem;
    width: 100%;
    justify-content: space-between;
  }
}