/* ==========================================================================
   MD Software — Components
   Buttons, Nav, Cards, Forms, Cursor, Loader
   ========================================================================== */

/* -------------------- CUSTOM CURSOR -------------------- */
.cursor-dot,
.cursor-ring {
  position: fixed;
  top: 0; left: 0;
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: difference;
  will-change: transform;
}
.cursor-dot {
  width: 6px; height: 6px;
  background: #fff;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 220ms var(--ease-out), height 220ms var(--ease-out), background 220ms var(--ease-out);
}
.cursor-ring {
  width: 36px; height: 36px;
  border: 1.5px solid rgba(255,255,255,0.6);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 320ms var(--ease-out), height 320ms var(--ease-out), border-color 320ms var(--ease-out), background 320ms var(--ease-out);
}
.cursor-dot.is-hover { width: 10px; height: 10px; }
.cursor-ring.is-hover {
  width: 60px; height: 60px;
  border-color: rgba(168, 85, 247, 0.9);
  background: rgba(168, 85, 247, 0.1);
}
.cursor-ring.is-click {
  transform: translate(-50%, -50%) scale(0.85);
}
@media (hover: none), (pointer: coarse) {
  .cursor-dot, .cursor-ring { display: none; }
  body, a, button { cursor: auto !important; }
}
body.has-cursor, body.has-cursor * { cursor: none; }

/* -------------------- LOADER -------------------- */
.loader {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: var(--bg);
  display: grid;
  place-items: center;
  transition: opacity 600ms var(--ease-out), visibility 600ms var(--ease-out);
}
.loader.hidden {
  opacity: 0;
  visibility: hidden;
}
.loader-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}
.loader-logo {
  width: 88px; height: 88px;
}
.loader-logo path {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  animation: drawLogo 2s var(--ease-in-out) infinite;
}
.loader-logo path:nth-child(2) { animation-delay: 0.25s; }
.loader-bar {
  width: 180px;
  height: 2px;
  background: var(--border);
  border-radius: 10px;
  overflow: hidden;
  position: relative;
}
.loader-bar span {
  position: absolute;
  inset: 0;
  background: var(--gradient-brand);
  border-radius: inherit;
  animation: loaderSweep 1.8s var(--ease-in-out) infinite;
}
.loader-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  color: var(--fg-muted);
}

/* -------------------- BUTTONS -------------------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-sans);
  letter-spacing: -0.01em;
  line-height: 1;
  border: 1px solid transparent;
  transition: all var(--t-med) var(--ease-out);
  white-space: nowrap;
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  user-select: none;
}
.btn svg { width: 18px; height: 18px; transition: transform var(--t-med) var(--ease-out); }
.btn:hover svg { transform: translateX(4px); }
.btn-sm { padding: 10px 18px; font-size: 0.88rem; }
.btn-sm svg { width: 14px; height: 14px; }
.btn-lg { padding: 18px 34px; font-size: 1.02rem; }

.btn-primary {
  background: var(--gradient-brand);
  color: #fff;
  background-size: 200% 200%;
  background-position: 0% 50%;
  box-shadow: 0 10px 30px rgba(99,102,241,0.35), inset 0 1px 0 rgba(255,255,255,0.2);
}
.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-brand);
  background-size: 200% 200%;
  background-position: 100% 50%;
  opacity: 0;
  transition: opacity var(--t-med) var(--ease-out);
  z-index: -1;
  border-radius: inherit;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px rgba(168,85,247,0.5), inset 0 1px 0 rgba(255,255,255,0.25);
}
.btn-primary:hover::before { opacity: 1; }
.btn-primary::after {
  content: "";
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 650ms ease;
}
.btn-primary:hover::after { left: 100%; }

.btn-ghost {
  background: var(--surface);
  color: var(--fg);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
}
.btn-ghost:hover {
  background: var(--surface-2);
  border-color: var(--border-2);
  transform: translateY(-2px);
}

.form-submit .btn-loading {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: inherit;
}
.form-submit.loading .btn-label,
.form-submit.loading svg { opacity: 0; }
.form-submit.loading .btn-loading {
  display: flex;
}
.form-submit.loading .btn-loading::before {
  content: "";
  width: 20px; height: 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* -------------------- NAVBAR -------------------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--t-med) var(--ease-out);
}
.navbar.scrolled {
  padding: 10px 0;
  background: rgba(7, 7, 13, 0.7);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
:root[data-theme="light"] .navbar.scrolled {
  background: rgba(247, 247, 251, 0.75);
  box-shadow: 0 10px 30px rgba(30,30,60,0.08);
}
.navbar.hidden {
  transform: translateY(-100%);
}

.nav-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.02em;
}
.logo-mark {
  width: 34px; height: 34px;
  color: var(--fg);
  transition: transform var(--t-med) var(--ease-back);
}
.nav-logo:hover .logo-mark { transform: rotate(-8deg) scale(1.08); }
.logo-text em {
  font-style: normal;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-links {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  backdrop-filter: blur(12px);
}
.nav-links a {
  position: relative;
  padding: 10px 18px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--fg-muted);
  border-radius: 100px;
  transition: color var(--t-fast) var(--ease-out);
}
.nav-links a:hover { color: var(--fg); }
.nav-links a::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--surface-2);
  border-radius: inherit;
  opacity: 0;
  transition: opacity var(--t-fast) var(--ease-out);
  z-index: -1;
}
.nav-links a:hover::before { opacity: 1; }
.nav-links a.active {
  color: var(--fg);
}
.nav-links a.active::before {
  opacity: 1;
  background: var(--gradient-soft);
  border: 1px solid var(--border-2);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  position: relative;
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  display: grid; place-items: center;
  color: var(--fg);
  transition: all var(--t-med) var(--ease-out);
  backdrop-filter: blur(10px);
  overflow: hidden;
}
.theme-toggle:hover {
  border-color: var(--border-2);
  background: var(--surface-2);
  transform: rotate(12deg);
}
.theme-toggle svg { width: 18px; height: 18px; transition: all var(--t-med) var(--ease-out); position: absolute; }
.theme-toggle .icon-moon { opacity: 0; transform: rotate(-90deg) scale(0.6); }
.theme-toggle .icon-sun { opacity: 1; transform: rotate(0) scale(1); }
:root[data-theme="light"] .theme-toggle .icon-moon { opacity: 1; transform: rotate(0) scale(1); }
:root[data-theme="light"] .theme-toggle .icon-sun  { opacity: 0; transform: rotate(90deg) scale(0.6); }

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 4px;
  border-radius: 100px;
  backdrop-filter: blur(10px);
}
.lang-btn {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--fg-muted);
  transition: all var(--t-fast) var(--ease-out);
  text-decoration: none;
}
.lang-btn:hover {
  background: var(--surface-2);
  color: var(--fg);
}
.lang-btn.active {
  background: var(--gradient-brand);
  color: #fff;
  box-shadow: 0 4px 12px rgba(99,102,241,0.25);
}

/* Mobile nav */
.nav-burger {
  display: none;
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  position: relative;
}
.nav-burger span {
  position: absolute;
  left: 50%; top: 50%;
  width: 18px; height: 2px;
  background: var(--fg);
  border-radius: 2px;
  transform: translate(-50%, -50%);
  transition: all var(--t-med) var(--ease-out);
}
.nav-burger span:nth-child(1) { transform: translate(-50%, -7px); }
.nav-burger span:nth-child(3) { transform: translate(-50%, 5px); }
.nav-burger.open span:nth-child(1) { transform: translate(-50%, -50%) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translate(-50%, -50%) rotate(-45deg); }

@media (max-width: 960px) {
  .nav-links {
    position: fixed;
    top: 72px;
    left: 16px; right: 16px;
    flex-direction: column;
    padding: 16px;
    border-radius: var(--radius-lg);
    background: rgba(7,7,13,0.9);
    backdrop-filter: blur(20px);
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: all var(--t-med) var(--ease-out);
    border: 1px solid var(--border);
  }
  :root[data-theme="light"] .nav-links {
    background: rgba(255,255,255,0.95);
  }
  .nav-links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .nav-links a { padding: 14px 20px; border-radius: 12px; }
  .nav-burger { display: grid; place-items: center; }
  .nav-cta span { display: none; }
  .nav-cta { padding: 10px; }
  .nav-cta svg { width: 16px; height: 16px; }
}
@media (max-width: 520px) {
  .nav-logo .logo-text em { display: none; }
}

/* -------------------- SERVICE CARDS -------------------- */
.service-card {
  position: relative;
  padding: 36px 30px 30px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
  backdrop-filter: blur(12px);
  transition: all var(--t-med) var(--ease-out);
  display: flex;
  flex-direction: column;
  isolation: isolate;
}
.service-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-2);
  box-shadow: var(--shadow-lg);
}
.card-glow {
  position: absolute;
  width: 220px; height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(168,85,247,0.35), transparent 70%);
  top: var(--my, 50%);
  left: var(--mx, 50%);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity var(--t-med) var(--ease-out);
  pointer-events: none;
  z-index: -1;
  filter: blur(20px);
}
.service-card:hover .card-glow { opacity: 1; }
.card-number {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--fg-dim);
  letter-spacing: 0.15em;
  margin-bottom: 20px;
}
.card-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  display: grid; place-items: center;
  color: var(--brand-1);
  margin-bottom: 24px;
  transition: all var(--t-med) var(--ease-out);
}
.service-card:hover .card-icon {
  background: var(--gradient-brand);
  color: #fff;
  border-color: transparent;
  transform: rotate(-4deg);
  box-shadow: var(--shadow-glow);
}
.card-icon svg { width: 28px; height: 28px; }

.service-card h3 { margin-bottom: 12px; }
.service-card > p {
  color: var(--fg-muted);
  font-size: 0.96rem;
  margin-bottom: 22px;
  flex-grow: 1;
}
.card-tags {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.card-tags li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 12px;
  border-radius: 100px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--fg-muted);
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--fg);
  padding-top: 16px;
  border-top: 1px solid var(--border);
  transition: all var(--t-med) var(--ease-out);
  position: relative;
  align-self: stretch;
}
.card-link svg {
  width: 16px; height: 16px;
  transition: transform var(--t-med) var(--ease-out);
}
.card-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  width: 0; height: 1px;
  background: var(--gradient-brand);
  transition: width var(--t-med) var(--ease-out);
}
.service-card:hover .card-link { color: var(--brand-2); }
.service-card:hover .card-link svg { transform: translateX(6px); }
.service-card:hover .card-link::after { width: 100%; }

/* 3D TILT HINT */
.tilt {
  transform-style: preserve-3d;
  will-change: transform;
}

/* -------------------- FORM -------------------- */
.contact-form {
  padding: 40px;
  position: relative;
}
.contact-form h3 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}
.form-desc {
  font-size: 0.94rem;
  color: var(--fg-muted);
  margin-bottom: 28px;
}
.form-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}
.form-field {
  position: relative;
  min-width: 0;
  margin-bottom: 16px;
}
.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 22px 16px 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--fg);
  font-size: 0.98rem;
  transition: all var(--t-med) var(--ease-out);
  outline: none;
  resize: vertical;
  backdrop-filter: blur(8px);
}
.form-field textarea { min-height: 130px; padding-top: 26px; }
.custom-select {
  position: relative;
  min-width: 0;
  z-index: 2;
}
.custom-select-trigger {
  width: 100%;
  min-width: 0;
  min-height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 0 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--fg-muted);
  font-size: 0.98rem;
  font-weight: 400;
  line-height: 1.25;
  text-align: left;
  transition: border-color var(--t-med) var(--ease-out), background var(--t-med) var(--ease-out), box-shadow var(--t-med) var(--ease-out);
  backdrop-filter: blur(8px);
}
.custom-select-trigger span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.custom-select-trigger svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  color: var(--fg-muted);
  transition: transform var(--t-med) var(--ease-out), color var(--t-med) var(--ease-out);
}
.custom-select.open .custom-select-trigger,
.custom-select-trigger:focus-visible {
  border-color: var(--brand-1);
  background: var(--surface-2);
  color: var(--fg);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.15);
}
.custom-select.open .custom-select-trigger svg {
  color: var(--brand-2);
  transform: rotate(180deg);
}
.custom-select-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  right: 0;
  z-index: 30;
  display: grid;
  gap: 4px;
  max-height: min(440px, 58vh);
  padding: 8px;
  overflow-y: auto;
  background:
    linear-gradient(180deg, rgba(18,18,31,0.98), rgba(10,10,18,0.98)),
    var(--bg-elev);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 70px rgba(0,0,0,0.48), 0 0 0 1px rgba(168,85,247,0.10) inset;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px) scale(0.98);
  transform-origin: top center;
  transition: opacity var(--t-fast) var(--ease-out), transform var(--t-fast) var(--ease-out);
}
.custom-select.open .custom-select-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}
.custom-select-menu button {
  width: 100%;
  min-height: 38px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--fg);
  font-size: 0.92rem;
  line-height: 1.25;
  text-align: left;
  transition: background var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out), transform var(--t-fast) var(--ease-out);
}
.custom-select-menu button:hover,
.custom-select-menu button:focus-visible,
.custom-select-menu button.active {
  background: linear-gradient(135deg, rgba(99,102,241,0.24), rgba(168,85,247,0.18));
  color: #ffffff;
  outline: none;
  transform: translateX(2px);
}
.custom-select-menu button[aria-selected="true"] {
  background: var(--gradient-brand);
  color: #ffffff;
}
.custom-select-menu::-webkit-scrollbar { width: 8px; }
.custom-select-menu::-webkit-scrollbar-track { background: transparent; }
.custom-select-menu::-webkit-scrollbar-thumb {
  background: rgba(164,164,184,0.28);
  border-radius: 999px;
}
:root[data-theme="light"] .custom-select-menu {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.98), rgba(247,247,251,0.98)),
    var(--bg-elev);
  box-shadow: 0 24px 60px rgba(30,30,60,0.18), 0 0 0 1px rgba(99,102,241,0.08) inset;
}
.form-field select {
  appearance: none;
  color-scheme: dark;
  padding-right: 40px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a4a4b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><path d='M6 9l6 6 6-6'/></svg>");
  background-repeat: no-repeat;
  background-position: right 16px center;
  background-size: 18px;
}
.form-field select option {
  background: #12121f;
  color: #f1f1f6;
}
.form-field select option:disabled {
  color: #a4a4b8;
}
:root[data-theme="light"] .form-field select {
  color-scheme: light;
}
:root[data-theme="light"] .form-field select option {
  background: #ffffff;
  color: #0a0a1a;
}
.form-field label {
  position: absolute;
  top: 16px;
  left: 17px;
  font-size: 0.92rem;
  color: var(--fg-muted);
  pointer-events: none;
  transition: all var(--t-med) var(--ease-out);
  background: transparent;
  padding: 0 4px;
}
.form-field label em { font-style: normal; color: var(--fg-dim); font-size: 0.8rem; }

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--brand-1);
  background: var(--surface-2);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.15);
}
.form-field input:focus + label,
.form-field input:not(:placeholder-shown) + label,
.form-field textarea:focus + label,
.form-field textarea:not(:placeholder-shown) + label,
.form-field select:focus + label,
.form-field select:valid + label {
  top: 6px;
  font-size: 0.72rem;
  color: var(--brand-2);
  letter-spacing: 0.04em;
}
.form-field select + label { display: none; }

.field-line {
  position: absolute;
  bottom: 0; left: 50%;
  height: 2px; width: 0;
  background: var(--gradient-brand);
  transition: all var(--t-med) var(--ease-out);
  border-radius: 2px;
}
.form-field input:focus ~ .field-line,
.form-field textarea:focus ~ .field-line,
.form-field select:focus ~ .field-line,
.custom-select.open ~ .field-line {
  width: 100%;
  left: 0;
}

.form-submit {
  width: 100%;
  justify-content: center;
  margin-top: 8px;
}
.form-footnote {
  margin-top: 18px;
  font-size: 0.78rem;
  color: var(--fg-dim);
  text-align: center;
}

@media (max-width: 520px) {
  .contact-form { padding: 28px 22px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
}

/* -------------------- SERVICE CARD: AI VARIANT -------------------- */
.service-card.service-ai {
  border-color: rgba(168, 85, 247, 0.28);
  background: linear-gradient(180deg, rgba(168,85,247,0.07), rgba(99,102,241,0.03) 60%, transparent);
}
.service-card.service-ai .card-icon {
  background: var(--gradient-brand);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 0 24px rgba(168,85,247,0.35);
}
.card-badge-ai {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 4px 10px;
  border-radius: 100px;
  background: var(--gradient-brand);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  box-shadow: 0 6px 20px rgba(168,85,247,0.4);
  z-index: 2;
}

/* -------------------- AI SECTION -------------------- */
.ai-section {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
.ai-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.mesh-ai {
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(40% 40% at 15% 25%, rgba(99,102,241,0.28), transparent 60%),
    radial-gradient(45% 45% at 85% 75%, rgba(168,85,247,0.24), transparent 60%),
    radial-gradient(35% 35% at 60% 10%, rgba(236,72,153,0.18), transparent 60%);
  filter: blur(60px);
  animation: meshMove 22s ease-in-out infinite alternate;
}
.orb-ai-1 { position: absolute; width: 420px; height: 420px; border-radius: 50%; background: var(--brand-1); filter: blur(90px); opacity: 0.22; top: 10%; left: -10%; }
.orb-ai-2 { position: absolute; width: 360px; height: 360px; border-radius: 50%; background: var(--brand-2); filter: blur(90px); opacity: 0.22; bottom: 5%; right: -8%; }
.ai-grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(168,85,247,0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(99,102,241,0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 70% at center, black 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at center, black 20%, transparent 75%);
}
.ai-section .container { position: relative; z-index: 1; }

.ai-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
  margin-bottom: 80px;
}

.ai-capabilities {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.ai-feature {
  display: flex;
  gap: 18px;
  padding: 22px 24px;
  border-radius: var(--radius-lg);
  transition: all var(--t-med) var(--ease-out);
  position: relative;
}
.ai-feature:hover {
  transform: translateX(6px);
  border-color: var(--border-2);
  box-shadow: var(--shadow-md);
}
.ai-feature-ico {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: grid; place-items: center;
  color: #fff;
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
}
.ai-feature-ico svg { width: 22px; height: 22px; }
.ai-feature-body { flex: 1; min-width: 0; }
.ai-feature-body h3 { font-size: 1.1rem; margin-bottom: 6px; }
.ai-feature-body p { font-size: 0.92rem; color: var(--fg-muted); margin-bottom: 12px; }
.ai-feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.ai-feature-tags span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 3px 10px;
  border-radius: 100px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--fg-muted);
}

/* CHAT MOCKUP */
.ai-showcase {
  position: sticky;
  top: 100px;
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 520px;
  max-height: 640px;
  border-color: rgba(168,85,247,0.25);
  box-shadow: 0 30px 80px rgba(99,102,241,0.18), inset 0 1px 0 rgba(255,255,255,0.06);
}
.ai-showcase::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(99,102,241,0.6), rgba(168,85,247,0.4), rgba(236,72,153,0.3), transparent 70%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}
.ai-chat-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: rgba(0,0,0,0.1);
}
.ai-dots { display: flex; gap: 6px; }
.ai-dots span {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
}
.ai-dots span:nth-child(1) { background: #ef4444; }
.ai-dots span:nth-child(2) { background: #f59e0b; }
.ai-dots span:nth-child(3) { background: #10b981; }
.ai-chat-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--fg-muted);
  flex: 1;
}
.ai-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 100px;
  border: 1px solid rgba(16,185,129,0.35);
  background: rgba(16,185,129,0.12);
  color: #10b981;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
}
.ai-pill-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
  animation: pulse 1.6s ease-in-out infinite;
}

.ai-chat-body {
  flex: 1;
  padding: 22px 20px 14px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 0.94rem;
  scrollbar-width: thin;
  scrollbar-color: rgba(168,85,247,0.3) transparent;
}
.ai-chat-body::-webkit-scrollbar { width: 4px; }
.ai-chat-body::-webkit-scrollbar-thumb { background: rgba(168,85,247,0.3); border-radius: 10px; }

.ai-msg {
  max-width: 85%;
  padding: 12px 16px;
  border-radius: 18px;
  line-height: 1.45;
  opacity: 0;
  transform: translateY(8px);
  animation: msgIn 500ms var(--ease-out) forwards;
}
.ai-msg.user {
  align-self: flex-end;
  background: var(--gradient-brand);
  color: #fff;
  border-bottom-right-radius: 6px;
  box-shadow: 0 6px 20px rgba(99,102,241,0.3);
}
.ai-msg.bot {
  align-self: flex-start;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--fg);
  border-bottom-left-radius: 6px;
  font-family: var(--font-sans);
}
.ai-msg.bot .ai-msg-avatar {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--brand-2);
  letter-spacing: 0.15em;
  margin-bottom: 6px;
  text-transform: uppercase;
}
.ai-msg.bot .ai-msg-avatar::before {
  content: "";
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--gradient-brand);
  box-shadow: 0 0 10px var(--brand-2);
}
.ai-msg code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: rgba(168,85,247,0.15);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--brand-2);
}
.ai-typing-dots {
  display: inline-flex;
  gap: 4px;
  align-items: center;
}
.ai-typing-dots span {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--fg-muted);
  animation: typingDot 1.2s ease-in-out infinite;
}
.ai-typing-dots span:nth-child(2) { animation-delay: 0.15s; }
.ai-typing-dots span:nth-child(3) { animation-delay: 0.3s; }

.ai-caret {
  display: inline-block;
  width: 7px; height: 1em;
  vertical-align: -2px;
  background: var(--brand-2);
  margin-left: 2px;
  animation: caretBlink 0.8s steps(2) infinite;
}

.ai-chat-input {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  background: rgba(0,0,0,0.1);
}
.ai-chat-ph {
  flex: 1;
  padding: 10px 14px;
  border-radius: 100px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--fg-muted);
  font-size: 0.9rem;
  font-family: var(--font-mono);
  min-height: 38px;
  display: flex;
  align-items: center;
}
.ai-chat-ph::after {
  content: "";
  display: inline-block;
  width: 7px; height: 1em;
  vertical-align: -2px;
  background: var(--brand-2);
  margin-left: 2px;
  animation: caretBlink 0.8s steps(2) infinite;
}
.ai-chat-send {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  display: grid; place-items: center;
  box-shadow: 0 6px 20px rgba(99,102,241,0.35);
  cursor: pointer;
  flex-shrink: 0;
}
.ai-chat-send svg { width: 18px; height: 18px; }

.ai-stream-indicator {
  position: absolute;
  top: 10px; right: 86px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--fg-dim);
  opacity: 0.6;
  pointer-events: none;
}
.ai-stream-indicator svg { width: 12px; height: 12px; animation: spin 8s linear infinite; }

/* AI STATS */
.ai-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding: 32px 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(99,102,241,0.08), rgba(168,85,247,0.04));
  border: 1px solid rgba(168,85,247,0.2);
  margin-bottom: 48px;
  backdrop-filter: blur(10px);
}
.ai-stat { text-align: center; padding: 8px; }
.ai-stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 10px;
}
.ai-stat-num span { font-size: 0.6em; }
.ai-stat-label {
  display: block;
  font-size: 0.88rem;
  color: var(--fg-muted);
  line-height: 1.45;
}

/* PROVIDERS STRIP */
.ai-providers {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  text-align: center;
}
.ai-providers-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.ai-providers-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.ai-provider {
  padding: 8px 16px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  backdrop-filter: blur(10px);
  transition: all var(--t-med) var(--ease-out);
  position: relative;
  overflow: hidden;
}
.ai-provider:hover {
  border-color: transparent;
  background: var(--gradient-brand);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(99,102,241,0.3);
}

/* Solution card AI variant */
.solution-card.solution-ai {
  border-color: rgba(168,85,247,0.3);
  background: linear-gradient(180deg, rgba(168,85,247,0.08), rgba(99,102,241,0.03) 60%, transparent);
}
.solution-badge-ai {
  position: absolute;
  top: 16px; right: 16px;
  padding: 4px 10px;
  border-radius: 100px;
  background: var(--gradient-brand);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  z-index: 2;
  box-shadow: 0 6px 20px rgba(168,85,247,0.4);
}

/* Stack subgroup */
.stack-subgroup {
  max-width: 1040px;
  margin: 0 auto 28px;
}
.stack-subgroup:last-child { margin-bottom: 0; }
.stack-group-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-muted);
  text-align: center;
  margin-bottom: 16px;
}
.stack-item.stack-ai {
  border-color: rgba(168,85,247,0.25);
  background: linear-gradient(180deg, rgba(168,85,247,0.08), rgba(99,102,241,0.03));
}

/* AI msg animation */
@keyframes msgIn {
  to { opacity: 1; transform: translateY(0); }
}
@keyframes typingDot {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-4px); opacity: 1; }
}

/* Responsive */
@media (max-width: 960px) {
  .ai-layout { grid-template-columns: 1fr; }
  .ai-showcase { position: relative; top: 0; min-height: 500px; }
  .ai-stats { grid-template-columns: 1fr; padding: 24px 18px; }
  .ai-stream-indicator { display: none; }
}
@media (max-width: 520px) {
  .ai-feature { flex-direction: column; gap: 12px; padding: 20px; }
  .card-badge-ai, .solution-badge-ai { top: 12px; right: 12px; }
}

/* -------------------- TOAST -------------------- */
.toast {
  position: fixed;
  bottom: 24px; left: 50%;
  transform: translateX(-50%) translateY(120%);
  padding: 14px 22px;
  background: var(--gradient-brand);
  color: #fff;
  border-radius: 100px;
  box-shadow: var(--shadow-glow);
  font-weight: 600;
  font-size: 0.92rem;
  z-index: 9998;
  transition: transform var(--t-slow) var(--ease-back);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.toast.show { transform: translateX(-50%) translateY(0); }
.toast svg { width: 18px; height: 18px; }