/* =========================================================
   IAM TECH LAB — STYLESHEET
   This file is organized top to bottom in the same order
   as the sections appear in index.html.
========================================================= */

/* ---------- 1. Variables & Animations ----------
   Keeping colors and fonts as variables means we can change
   the whole site's look by editing values in one place. */
:root {
  /* Light mode (default) */
  --color-bg: #f7fafc;
  --color-bg-alt: #edf2f7;
  --color-primary: #0f2d52;
  --color-accent: #1fb6a6;
  --color-accent-dark: #16927f;
  --color-text: #1f2937;
  --color-text-light: #5b6472;
  --color-white: #ffffff;
  --color-error: #d92d20;

  --font-heading: "Poppins", sans-serif;
  --font-body: "Inter", sans-serif;

  --max-width: 1100px;
  --radius: 10px;
}

/* Dark mode colors */
[data-theme="dark"] {
  --color-bg: #0f1419;
  --color-bg-alt: #1a1f2e;
  --color-primary: #e8f4f8;
  --color-accent: #2dd9c1;
  --color-accent-dark: #1fb6a6;
  --color-text: #e5e7eb;
  --color-text-light: #a0aec0;
  --color-white: #1f2937;
  --color-error: #ff6b6b;
}

/* Smooth color transitions */
html {
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Fade-in animation for dynamic content like tips */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 2. Reset & base styles ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box; /* makes width/height calculations easier */
}

html {
  scroll-behavior: smooth; /* smooth scrolling when clicking nav links */
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
}

h1, h2, h3 {
  font-family: var(--font-heading);
  color: var(--color-primary);
  line-height: 1.2;
}

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

ul {
  list-style: none;
}

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

/* A reusable centered container so every section lines up nicely */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Shared spacing for every main section */
.section {
  padding: 70px 0;
}

.alt-bg {
  background-color: var(--color-bg-alt);
}

.section-subtitle {
  color: var(--color-text-light);
  margin-top: 8px;
  margin-bottom: 30px;
}

/* ---------- 3. Buttons ----------
   One shared base style, then small variations for color. */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-accent-dark);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-white);
  color: var(--color-white);
}

[data-theme="dark"] .btn-secondary {
  border-color: #a0aec0;
  color: #a0aec0;
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.15);
}

[data-theme="dark"] .btn-secondary:hover {
  background-color: rgba(160, 174, 192, 0.15);
}

/* ---------- 4. Header / Navigation ---------- */
.site-header {
  background-color: var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 0.3s ease;
}

[data-theme="dark"] .site-header {
  background-color: #1a1f2e;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
  gap: 12px;
}

/* Hamburger menu button - hidden on desktop */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0;
  transition: all 0.3s ease;
  border-radius: 4px;
}

.mobile-menu-toggle:hover {
  background-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .mobile-menu-toggle:hover {
  background-color: rgba(160, 174, 192, 0.08);
}

.mobile-menu-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.hamburger {
  width: 22px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 1px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: block;
  position: relative;
}

[data-theme="dark"] .hamburger {
  background-color: #a0aec0;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 22px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 1px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  left: 0;
}

[data-theme="dark"] .hamburger::before,
[data-theme="dark"] .hamburger::after {
  background-color: #a0aec0;
}

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  bottom: -7px;
}

/* Hamburger animation when menu is open */
.mobile-menu-toggle.active .hamburger {
  background-color: transparent;
}

.mobile-menu-toggle.active .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.mobile-menu-toggle.active .hamburger::after {
  bottom: 0;
  transform: rotate(-45deg);
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-white);
  flex-shrink: 0;
}

[data-theme="dark"] .logo {
  color: #e5e7eb;
}

.logo span {
  color: var(--color-accent);
}

.main-nav {
  display: flex;
}

.main-nav ul {
  display: flex;
  gap: 28px;
}

.main-nav a {
  color: var(--color-white);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s ease;
  position: relative;
}

[data-theme="dark"] .main-nav a {
  color: #a0aec0;
}

.main-nav a:hover {
  color: var(--color-accent);
}

.main-nav a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: 2px solid var(--color-white);
  color: var(--color-white);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all 0.3s ease;
  flex-shrink: 0;
}

[data-theme="dark"] .theme-toggle {
  border-color: #a0aec0;
  color: #a0aec0;
}

.theme-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
  transform: scale(1.1);
}

[data-theme="dark"] .theme-toggle:hover {
  background-color: rgba(160, 174, 192, 0.1);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.theme-icon {
  display: inline-block;
  transition: transform 0.3s ease;
}

/* ---------- 5. Hero / Homepage Section ---------- */
.hero {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary));
  color: var(--color-white);
  padding: 110px 0 90px;
  text-align: center;
}

[data-theme="dark"] .hero {
  background: linear-gradient(135deg, #1a2f4d, #0f1f3d);
}

.hero-content {
  max-width: 700px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.85rem;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 10px;
}

.hero h1 {
  color: var(--color-white);
  font-size: 3rem;
  margin-bottom: 16px;
}

[data-theme="dark"] .hero h1 {
  color: var(--color-accent);
}

.hero-text {
  font-size: 1.1rem;
  color: #dbe5f0;
  margin-bottom: 30px;
}

[data-theme="dark"] .hero-text {
  color: #a0aec0;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* The message that appears/changes when the "Get a Quick Tech Tip" button is clicked */
.tip-message {
  margin-top: 24px;
  min-height: 24px; /* keeps layout stable even before the message appears */
  font-weight: 500;
  color: var(--color-accent);
  opacity: 0;
  transform: translateY(-8px);
}

.tip-message.fade-in {
  animation: fadeIn 0.4s ease-out forwards;
}

/* ---------- 6. About Section ---------- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 36px;
}

.about-card {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(15, 45, 82, 0.08);
  transition: all 0.3s ease;
}

[data-theme="dark"] .about-card {
  background-color: #1a1f2e;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(15, 45, 82, 0.15);
}

[data-theme="dark"] .about-card:hover {
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
}

.about-card h3 {
  font-size: 2rem;
  color: var(--color-accent);
}

.about-card p {
  color: var(--color-text-light);
  margin-top: 6px;
}

/* ---------- 7. Services Section ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.service-card {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 2px 8px rgba(15, 45, 82, 0.08);
  transition: all 0.3s ease;
}

[data-theme="dark"] .service-card {
  background-color: #1a1f2e;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(15, 45, 82, 0.15);
}

[data-theme="dark"] .service-card:hover {
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
}

.service-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.service-card h3 {
  margin-bottom: 8px;
  font-size: 1.15rem;
}

.service-card p {
  color: var(--color-text-light);
}

/* ---------- 8. Contact Section ---------- */
#contactForm {
  max-width: 600px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #cbd5e0;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 1rem;
  background-color: var(--color-white);
  color: var(--color-text);
  transition: all 0.2s ease;
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea {
  background-color: #2a2f3f;
  border-color: #404859;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(31, 182, 166, 0.1);
}

/* Style for inputs with validation errors */
.form-group input.input-error,
.form-group textarea.input-error {
  border-color: var(--color-error);
  background-color: rgba(217, 45, 32, 0.03);
}

.form-group input.input-error:focus,
.form-group textarea.input-error:focus {
  box-shadow: 0 0 0 3px rgba(217, 45, 32, 0.1);
}

/* Error text shown under each field when validation fails */
.error-message {
  display: block;
  color: var(--color-error);
  font-size: 0.85rem;
  margin-top: 6px;
  min-height: 18px; /* keeps spacing steady whether or not there's an error */
}

.form-success {
  margin-top: 16px;
  color: var(--color-accent-dark);
  font-weight: 600;
}

/* ---------- 9. Footer ---------- */
.site-footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  text-align: center;
  padding: 24px 0;
  font-size: 0.9rem;
}

[data-theme="dark"] .site-footer {
  background-color: #1a1f2e;
  color: #a0aec0;
}

/* =========================================================
   10. RESPONSIVE / MOBILE-FRIENDLY STYLES
   Anything below this changes the layout on smaller screens.
========================================================= */
@media (max-width: 768px) {
  .nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 8px;
    position: relative;
  }

  .logo {
    font-size: 1.1rem;
    flex-grow: 1;
    flex-shrink: 0;
  }

  /* Show hamburger menu on mobile */
  .mobile-menu-toggle {
    display: flex;
    order: 3;
  }

  /* Theme toggle positioned before hamburger */
  .theme-toggle {
    order: 2;
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
    border-width: 1.5px;
  }

  /* Hide regular nav on mobile, show as dropdown */
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  [data-theme="dark"] .main-nav {
    background-color: #1a1f2e;
    border-top-color: rgba(255, 255, 255, 0.05);
  }

  /* Show mobile menu when active */
  .main-nav.active {
    max-height: 300px;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 16px 0;
  }

  .main-nav li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  [data-theme="dark"] .main-nav li {
    border-bottom-color: rgba(255, 255, 255, 0.05);
  }

  .main-nav li:last-child {
    border-bottom: none;
  }

  .main-nav a {
    display: block;
    padding: 12px 20px;
    font-size: 1rem;
  }

  .main-nav a:hover {
    background-color: rgba(31, 182, 166, 0.1);
  }

  [data-theme="dark"] .main-nav a:hover {
    background-color: rgba(45, 217, 193, 0.1);
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .about-grid {
    grid-template-columns: 1fr; /* stack the three boxes on mobile */
  }

  .services-grid {
    grid-template-columns: 1fr; /* stack service cards on mobile */
  }

  .section {
    padding: 50px 0;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 1.1rem;
  }

  .logo span {
    display: block;
  }

  .hero {
    padding: 70px 0 50px;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

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

  .hero-buttons {
    flex-direction: column;
    gap: 12px;
  }

  .btn {
    width: 100%;
    padding: 14px 20px;
  }

  .section {
    padding: 40px 0;
  }

  #contactForm {
    margin: 0 auto;
  }
}