/* style.css — AISUS.agency Design System */

/* ===== TYPE SCALE ===== */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.9rem  + 0.5vw,  1.125rem);
  --text-lg:   clamp(1.125rem, 0.95rem + 0.85vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1rem    + 1.5vw,  2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* ===== SPACING ===== */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* ===== FONTS ===== */
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  /* ===== RADIUS ===== */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* ===== TRANSITIONS ===== */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* ===== CONTENT WIDTHS ===== */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;
}

/* ===== DARK MODE (Default) ===== */
:root, [data-theme="dark"] {
  --color-bg:             #0a0e13;
  --color-surface:        #0f1419;
  --color-surface-2:      #151b22;
  --color-surface-offset: #1a2230;
  --color-surface-offset-2: #1f2937;
  --color-surface-dynamic: #263040;
  --color-divider:        #1e2d3d;
  --color-border:         #2a3a4e;

  /* Text */
  --color-text:           #e0e8f0;
  --color-text-muted:     #8899aa;
  --color-text-faint:     #4a5e72;
  --color-text-inverse:   #0a0e13;

  /* Primary — Neon Cyan */
  --color-primary:        #00d4ff;
  --color-primary-hover:  #00b8e0;
  --color-primary-active: #009dc0;
  --color-primary-highlight: #0a2a35;

  /* Secondary — Solar Gold / Amber */
  --color-secondary:      #f0a030;
  --color-secondary-hover: #d89020;
  --color-secondary-active: #c08018;
  --color-secondary-highlight: #2a2010;

  /* Error */
  --color-error:          #ff4466;
  --color-error-hover:    #e03355;
  --color-error-active:   #c02244;
  --color-error-highlight: #2a1018;

  /* Success */
  --color-success:        #00cc88;
  --color-success-hover:  #00b077;
  --color-success-active: #009966;
  --color-success-highlight: #0a2a1d;

  /* Warning */
  --color-warning:        #f0a030;
  --color-warning-hover:  #d89020;
  --color-warning-active: #c08018;
  --color-warning-highlight: #2a2010;

  /* Shadows */
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.5);
}

/* ===== LIGHT MODE ===== */
[data-theme="light"] {
  --color-bg:             #f0f4f8;
  --color-surface:        #f8fafb;
  --color-surface-2:      #ffffff;
  --color-surface-offset: #e8edf2;
  --color-surface-offset-2: #dde4eb;
  --color-surface-dynamic: #d0d8e2;
  --color-divider:        #c8d0da;
  --color-border:         #b8c4d0;

  --color-text:           #0a1628;
  --color-text-muted:     #566880;
  --color-text-faint:     #8899aa;
  --color-text-inverse:   #f0f4f8;

  --color-primary:        #0090b0;
  --color-primary-hover:  #007a98;
  --color-primary-active: #006580;
  --color-primary-highlight: #d0eef5;

  --color-secondary:      #c08018;
  --color-secondary-hover: #a87010;
  --color-secondary-active: #906010;
  --color-secondary-highlight: #faf0d8;

  --color-error:          #d0304a;
  --color-error-hover:    #b0203a;
  --color-error-active:   #90102a;
  --color-error-highlight: #fde8ec;

  --color-success:        #00995a;
  --color-success-hover:  #008050;
  --color-success-active: #006840;
  --color-success-highlight: #e0f5ec;

  --color-warning:        #b87818;
  --color-warning-hover:  #a06810;
  --color-warning-active: #885808;
  --color-warning-highlight: #fdf0d8;

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 240 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 240 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 240 / 0.12);
}

/* System preference fallback */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg:             #f0f4f8;
    --color-surface:        #f8fafb;
    --color-surface-2:      #ffffff;
    --color-surface-offset: #e8edf2;
    --color-surface-offset-2: #dde4eb;
    --color-surface-dynamic: #d0d8e2;
    --color-divider:        #c8d0da;
    --color-border:         #b8c4d0;
    --color-text:           #0a1628;
    --color-text-muted:     #566880;
    --color-text-faint:     #8899aa;
    --color-text-inverse:   #f0f4f8;
    --color-primary:        #0090b0;
    --color-primary-hover:  #007a98;
    --color-primary-active: #006580;
    --color-primary-highlight: #d0eef5;
    --color-secondary:      #c08018;
    --color-secondary-hover: #a87010;
    --color-secondary-active: #906010;
    --color-secondary-highlight: #faf0d8;
    --color-error:          #d0304a;
    --color-error-hover:    #b0203a;
    --color-error-active:   #90102a;
    --color-error-highlight: #fde8ec;
    --color-success:        #00995a;
    --color-success-hover:  #008050;
    --color-success-active: #006840;
    --color-success-highlight: #e0f5ec;
    --color-warning:        #b87818;
    --color-warning-hover:  #a06810;
    --color-warning-active: #885808;
    --color-warning-highlight: #fdf0d8;
    --shadow-sm: 0 1px 2px oklch(0.2 0.01 240 / 0.06);
    --shadow-md: 0 4px 12px oklch(0.2 0.01 240 / 0.08);
    --shadow-lg: 0 12px 32px oklch(0.2 0.01 240 / 0.12);
  }
}

/* ===== COMPONENT STYLES ===== */

/* Container */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container--narrow {
  max-width: var(--content-narrow);
}

.container--default {
  max-width: var(--content-default);
}

/* Section spacing */
.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-32));
}

/* Typography utilities */
.font-display { font-family: var(--font-display); }
.font-body { font-family: var(--font-body); }

.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-hero { font-size: var(--text-hero); }

.text-muted { color: var(--color-text-muted); }
.text-faint { color: var(--color-text-faint); }
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-display);
  letter-spacing: 0.02em;
  border-radius: var(--radius-lg);
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 0 20px oklch(from var(--color-primary) l c h / 0.3);
}

.btn--secondary {
  background: transparent;
  color: var(--color-secondary);
  border: 1px solid var(--color-secondary);
}

.btn--secondary:hover {
  background: oklch(from var(--color-secondary) l c h / 0.1);
  box-shadow: 0 0 20px oklch(from var(--color-secondary) l c h / 0.15);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--ghost:hover {
  background: var(--color-surface);
  border-color: var(--color-text-faint);
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.card:hover {
  border-color: oklch(from var(--color-primary) l c h / 0.3);
  box-shadow: 0 0 24px oklch(from var(--color-primary) l c h / 0.08);
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.badge--primary {
  background: oklch(from var(--color-primary) l c h / 0.15);
  color: var(--color-primary);
}

.badge--secondary {
  background: oklch(from var(--color-secondary) l c h / 0.15);
  color: var(--color-secondary);
}

/* Divider */
.divider {
  height: 1px;
  background: var(--color-divider);
  border: none;
}

/* Form elements */
.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.15);
}

.form-label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
  letter-spacing: 0.02em;
}

textarea.form-input {
  resize: vertical;
  min-height: 120px;
}

select.form-input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none'%3E%3Cpath d='M1 1.5l5 5 5-5' stroke='%238899aa' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-10);
}

/* Scroll reveal animation */
.fade-in {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 100%;
  }
}

@keyframes reveal-fade {
  to { opacity: 1; }
}

.reveal-up {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .reveal-up {
    clip-path: inset(100% 0 0 0);
    opacity: 0;
    animation: reveal-clip linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 80%;
  }
}

@keyframes reveal-clip {
  to { clip-path: inset(0 0 0 0); opacity: 1; }
}

/* Glow text utility */
.glow-text {
  text-shadow: 0 0 20px oklch(from var(--color-primary) l c h / 0.4),
               0 0 40px oklch(from var(--color-primary) l c h / 0.2);
}

/* Grid layouts */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(260px, 100%), 1fr));
  gap: var(--space-6);
}

/* Nav styles */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.06);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  max-width: var(--content-wide);
  margin-inline: auto;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
}

.nav__links {
  display: none;
  list-style: none;
  gap: var(--space-1);
}

@media (min-width: 1024px) {
  .nav__links {
    display: flex;
  }
}

.nav__link {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive),
              background var(--transition-interactive);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text);
  background: var(--color-surface);
}

.nav__link--active {
  color: var(--color-primary);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav__menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-text);
}

@media (min-width: 1024px) {
  .nav__menu-btn {
    display: none;
  }
}

/* Mobile menu */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background: oklch(from var(--color-bg) l c h / 0.97);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-6);
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-menu.is-open {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu__link {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.mobile-menu__link:hover,
.mobile-menu__link:active {
  color: var(--color-primary);
}

.mobile-menu__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}