/* ============================================
   ISTech - Shared Styles (shared.css)
   ============================================ */

@import url("https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:ital,wght@0,300;0,400;0,500;1,300&display=swap");

/* ---------- CSS Variables ---------- */
:root {
  --primary: #0a2540;
  --accent: #00c2a8;
  --accent-warm: #ff6b35;
  --bg: #f7f8fc;
  --surface: #ffffff;
  --surface-alt: #eef1f8;
  --text: #0a2540;
  --text-muted: #6b7a99;
  --border: #dde3f0;
  --shadow-sm: 0 2px 8px rgba(10, 37, 64, 0.07);
  --shadow-md: 0 6px 24px rgba(10, 37, 64, 0.1);
  --shadow-lg: 0 16px 48px rgba(10, 37, 64, 0.13);
  --radius: 14px;
  --radius-sm: 8px;
  --font-display:
    system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial,
    sans-serif;
  --font-body: "DM Sans", sans-serif;
  --nav-h: 72px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}
a {
  text-decoration: none;
  color: inherit;
}
ul {
  list-style: none;
}
button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* ---------- Utility ---------- */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 800;
  color: var(--primary);
  line-height: 1.15;
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 560px;
  margin-top: 12px;
  font-weight: 300;
  line-height: 1.5;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 50px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(10, 37, 64, 0.18);
}
.btn-primary:hover {
  background: #0d3060;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(10, 37, 64, 0.22);
}

.btn-accent {
  background: var(--accent);
  color: var(--primary);
  font-weight: 600;
}
.btn-accent:hover {
  background: #00dfc0;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 194, 168, 0.25);
}

.btn-outline {
  border: 2px solid var(--primary);
  color: var(--primary);
  background: transparent;
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-ghost {
  color: var(--primary);
  padding: 13px 20px;
}
.btn-ghost:hover {
  color: var(--accent);
}

/* ---------- Navigation ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  background: rgba(247, 248, 252, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo-img {
  display: block;
  width: auto;
  height: 82px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: 8px;
  transition: all var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background: var(--surface-alt);
}

.nav-links a.active {
  font-weight: 600;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ---------- Footer ---------- */
.footer {
  background: var(--primary);
  color: rgba(255, 255, 255, 0.85);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .nav-logo {
  color: #fff;
  margin-bottom: 16px;
}
.footer-brand .nav-logo-mark {
  background: var(--accent);
}
.footer-brand .nav-logo-mark::before {
  background: var(--primary);
}
.footer-brand .nav-logo-mark span {
  color: var(--primary);
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.55);
  max-width: 260px;
}

.footer-col h4 {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.4);
  margin-bottom: 18px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition);
}
.footer-col ul a:hover {
  color: var(--accent);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.35);
}

.footer-bottom a {
  color: var(--accent);
}

/* ---------- Page Header (inner pages) ---------- */
.page-header {
  padding: calc(var(--nav-h) + 64px) 0 64px;
  background: linear-gradient(135deg, var(--primary) 0%, #0d3a6e 100%);
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -15%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(0, 194, 168, 0.12) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.page-header-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.page-header .section-label {
  color: var(--accent);
}
.page-header h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800;
  color: #fff;
  line-height: 1.1;
  margin-bottom: 16px;
}
.page-header p {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.65);
  font-weight: 300;
}

/* ---------- Section spacing ---------- */
.section {
  padding: 60px 0;
}

/* ---------- Notifications ---------- */
.notification {
  position: fixed;
  top: calc(var(--nav-h) + 20px);
  right: 20px;
  max-width: 400px;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--accent);
  z-index: 1001;
  transform: translateX(100%);
  opacity: 0;
  transition: all var(--transition);
}

.notification.show {
  transform: translateX(0);
  opacity: 1;
}

.notification.success {
  border-left-color: #4caf50;
}

.notification.error {
  border-left-color: #f44336;
}

.notification.warning {
  border-left-color: #ff9800;
}

.notification.info {
  border-left-color: #2196f3;
}

.notification-content {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
}

.notification-icon {
  font-size: 18px;
  font-weight: bold;
  flex-shrink: 0;
}

.notification-text {
  flex: 1;
  font-size: 14px;
  line-height: 1.4;
}

.notification-close {
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background var(--transition);
}

.notification-close:hover {
  background: var(--surface-alt);
  color: var(--text);
}

/* ---------- User greeting ---------- */
.user-greeting {
  font-size: 14px;
  color: var(--text-muted);
  margin-right: 16px;
}
.section-alt {
  background: var(--surface-alt);
}
.section-dark {
  background: var(--primary);
  color: #fff;
}

/* ---------- Card ---------- */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

/* ---------- Badge ---------- */
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  background: rgba(0, 194, 168, 0.1);
  color: var(--accent);
  letter-spacing: 0.02em;
}

/* ---------- Scroll animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ---------- Responsive Nav ---------- */
@media (max-width: 860px) {
  .nav-toggle {
    display: flex;
  }
  .nav-cta .btn:not(.btn-accent) {
    display: none;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 20px 24px;
    gap: 4px;
    transform: translateY(-110%);
    opacity: 0;
    transition: all var(--transition);
    box-shadow: var(--shadow-md);
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
  }
  .nav-links a {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }
  .nav-cta {
    display: none;
  }
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}
@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}