/* ==========================================================================
   Silvercore — Stripe-inspired static site with dual theme support
   ========================================================================== */

/* --- Base tokens (shared) --- */
:root {
  --font-sans: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.12);
  --transition: 0.2s ease;
  --header-height: 72px;
  --container-max: 1140px;
}

/* --- Stripe theme (default) --- */
:root,
:root[data-theme="stripe"] {
  --bg: #ffffff;
  --bg-subtle: #f6f9fc;
  --bg-muted: #eef2f7;
  --text: #0a2540;
  --text-muted: #425466;
  --text-subtle: #697386;
  --border: rgba(0, 0, 0, 0.08);
  --accent: #635bff;
  --accent-hover: #4f46e5;
  --accent-soft: rgba(99, 91, 255, 0.1);
  --gradient-hero: linear-gradient(
    135deg,
    #635bff 0%,
    #7c3aed 25%,
    #06b6d4 50%,
    #10b981 75%,
    #f59e0b 100%
  );
  --gradient-text: linear-gradient(135deg, #635bff, #06b6d4);
  --hero-accent-text: #5d7a96;
  /* Stripe-style silk swoosh — layered radial bands */
  --sw-base:
    radial-gradient(60% 55% at 78% -4%, #aab8ff 0%, rgba(170,184,255,0) 58%),
    radial-gradient(46% 52% at 92% 16%, #c9b6ff 0%, rgba(201,182,255,0) 60%),
    radial-gradient(50% 56% at 84% 32%, #ffd789 0%, rgba(255,215,137,0) 62%),
    radial-gradient(54% 62% at 66% 44%, #ff9a3d 0%, rgba(255,154,61,0) 60%),
    radial-gradient(60% 70% at 90% 60%, #ff4d8d 0%, rgba(255,77,141,0) 62%),
    radial-gradient(78% 88% at 104% 90%, #6a2ff0 0%, rgba(106,47,240,0) 58%),
    linear-gradient(154deg, #9db4ff 0%, #c6a6ff 22%, #ffab5c 48%, #ff3d77 68%, #7b34ec 100%);
  --sw-light: radial-gradient(54% 60% at 80% 8%, #c4d0ff 0%, rgba(196,208,255,0) 62%);
  --sw-fold: radial-gradient(32% 130% at 74% 40%, rgba(255,241,210,0.95) 0%, rgba(255,176,84,0.3) 32%, rgba(255,176,84,0) 58%);
  --sw-deep: radial-gradient(64% 78% at 100% 92%, #5a23d6 0%, rgba(90,35,214,0) 56%);
  --logo-stop-1: #635bff;
  --logo-stop-2: #06b6d4;
  --logo-stop-3: #10b981;
  --code-bg: #0a2540;
  --code-header: #1a365d;
  --btn-primary-bg: #635bff;
  --btn-primary-hover: #4f46e5;
  --card-hover-border: rgba(99, 91, 255, 0.3);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

/* --- Utilities --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.75rem 1.25rem;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.skip-link:focus {
  top: 1rem;
}

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

/* --- Logo gradient stops (SVG) --- */
.logo-stop-1 { stop-color: var(--logo-stop-1); }
.logo-stop-2 { stop-color: var(--logo-stop-2); }
.logo-stop-3 { stop-color: var(--logo-stop-3); }

/* --- Header / Nav --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  color: var(--text);
  flex-shrink: 0;
}

.logo-text {
  text-transform: lowercase;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

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

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.active {
  color: var(--text);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

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

.btn-primary {
  background: var(--btn-primary-bg);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--btn-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Hero-orange accent button */
.btn-accent {
  background: linear-gradient(135deg, #ff8a3d 0%, #f4632b 100%);
  color: #fff;
  box-shadow: 0 1px 2px rgba(244, 99, 43, 0.25);
}

.btn-accent:hover {
  background: linear-gradient(135deg, #ff7a2b 0%, #e85420 100%);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(244, 99, 43, 0.35);
}

.btn-accent:focus-visible {
  outline-color: #f4632b;
}

.btn-secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--bg-subtle);
  border-color: var(--card-hover-border);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-linkedin {
  padding: 1rem 1.75rem;
  font-size: 1rem;
}

/* --- Hero --- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 7rem 0 8rem;
  display: flex;
  align-items: center;
}

/* Signature Stripe silk swoosh — anchored top-right, fading into white near the text */
.hero-bg {
  position: absolute;
  top: -34%;
  right: -14%;
  width: 70%;
  height: 168%;
  pointer-events: none;
  /* Dissolve into the white page on the left so the headline stays on clean white */
  -webkit-mask-image: linear-gradient(102deg, transparent 4%, rgba(0, 0, 0, 0.65) 22%, #000 42%);
  mask-image: linear-gradient(102deg, transparent 4%, rgba(0, 0, 0, 0.65) 22%, #000 42%);
}

.swoosh {
  position: absolute;
  inset: 0;
  will-change: transform;
}

.swoosh-base {
  background: var(--sw-base);
  filter: blur(22px) saturate(1.28);
  transform: rotate(-9deg) skewX(-6deg);
  animation: swooshDrift 22s ease-in-out infinite alternate;
}

.swoosh-light {
  background: var(--sw-light);
  filter: blur(30px);
  mix-blend-mode: screen;
  transform: rotate(-9deg);
  animation: swooshDrift 26s ease-in-out infinite alternate-reverse;
}

/* The bright "fold" of light running through the ribbon */
.swoosh-fold {
  background: var(--sw-fold);
  filter: blur(22px);
  mix-blend-mode: screen;
  transform: rotate(-20deg);
  animation: swooshFold 19s ease-in-out infinite alternate;
}

.swoosh-deep {
  background: var(--sw-deep);
  filter: blur(34px);
  transform: rotate(-6deg);
  animation: swooshDrift 24s ease-in-out infinite alternate;
}

@keyframes swooshDrift {
  from { transform: translate3d(0, -2%, 0) rotate(-11deg) skewX(-6deg); }
  to   { transform: translate3d(-2%, 3%, 0) rotate(-6deg) skewX(-4deg); }
}

@keyframes swooshFold {
  from { transform: translate3d(0, -3%, 0) rotate(-24deg); opacity: 0.85; }
  to   { transform: translate3d(-3%, 4%, 0) rotate(-15deg); opacity: 1; }
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 40rem;
}

.hero-eyebrow {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 1.5rem;
}

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

.hero h1 {
  font-size: clamp(2.25rem, 5.5vw, 4rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.035em;
  margin-bottom: 2rem;
  color: var(--text);
}

.hero h1 .hero-accent {
  display: block;
  margin-top: 0.5rem;
  color: var(--hero-accent-text);
  font-weight: 600;
}

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

.btn-arrow {
  font-size: 1.1em;
  line-height: 1;
}

/* --- Clients / tech strip --- */
.clients {
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 0;
  background: var(--bg);
}

.clients-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem 2.5rem;
}

.clients-row li {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-subtle);
  opacity: 0.85;
}

/* --- Sections --- */
.section {
  padding: 6rem 0;
}

.section-header {
  text-align: center;
  max-width: 36rem;
  margin-inline: auto;
  margin-bottom: 3.5rem;
}

.section-header--left {
  text-align: left;
  margin-inline: 0;
  margin-bottom: 2rem;
}

.section-header h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.section-header p {
  color: var(--text-muted);
  font-size: 1.0625rem;
}

.services {
  background: var(--bg-subtle);
}

/* --- Cards --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  border-color: var(--card-hover-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
}

.card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.card p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* --- About --- */
.about {
  background: var(--bg);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-content p {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}

.tech-stack li {
  padding: 0.375rem 0.875rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.stat-card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-subtle);
  font-weight: 500;
}

/* --- Contact --- */
.contact {
  background: var(--bg-subtle);
}

.contact-inner {
  display: flex;
  justify-content: center;
}

.contact-content {
  text-align: center;
  max-width: 32rem;
}

.contact-content h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.contact-content p {
  color: var(--text-muted);
  font-size: 1.0625rem;
  margin-bottom: 2rem;
}

/* --- Footer --- */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo--footer {
  font-size: 1rem;
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--text-subtle);
}

/* --- Responsive --- */
@media (max-width: 960px) {
  .hero {
    padding: 5rem 0 6rem;
  }

  .hero-bg {
    width: 95%;
    right: -25%;
    opacity: 0.85;
  }

  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

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

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2rem;
    padding: 2rem 1.5rem;
    background: var(--bg);
    border-top: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
  }

  .nav-menu.is-open {
    transform: translateX(0);
  }

  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    display: block;
    padding: 1rem 0;
    font-size: 1.125rem;
    border-bottom: 1px solid var(--border);
  }

  .nav-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-actions .btn {
    width: 100%;
    text-align: center;
  }

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

  .hero {
    padding: 3.5rem 0 4.5rem;
  }

  .hero-bg {
    opacity: 0.6;
  }

  .clients-row {
    justify-content: center;
    gap: 1rem 1.75rem;
  }

  .section {
    padding: 4rem 0;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

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

  .about-stats {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}