/* ============================================
   ФСТ — CNC Industrial Theme
   Steel gray + amber/orange accent
   ============================================ */

:root {
  /* Type scale */
  --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,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);

  /* 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;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

  /* Fonts */
  --font-body: 'Inter', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;

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

/* ---- DARK MODE (default) ---- */
:root, [data-theme="dark"] {
  --color-bg:          #0f1114;
  --color-surface:     #181b20;
  --color-surface-2:   #1e2228;
  --color-border:      #2a2f38;
  --color-border-hover:#3a4150;
  --color-text:        #c8ccd4;
  --color-text-muted:  #6b7280;
  --color-text-faint:  #4a5060;
  --color-accent:      #e8871e;
  --color-accent-hover:#f59e3b;
  --color-accent-dim:  rgba(232, 135, 30, 0.12);
  --color-accent-glow: rgba(232, 135, 30, 0.06);
  --color-success:     #3dbb5e;
  --color-error:       #e54d4d;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4), 0 1px 3px rgba(0,0,0,0.3);
  --grid-color: rgba(200, 204, 212, 0.03);
}

/* ---- LIGHT MODE ---- */
[data-theme="light"] {
  --color-bg:          #eef0f4;
  --color-surface:     #f7f8fa;
  --color-surface-2:   #ffffff;
  --color-border:      #d0d4dc;
  --color-border-hover:#b0b8c4;
  --color-text:        #1a1e28;
  --color-text-muted:  #5a6070;
  --color-text-faint:  #8a90a0;
  --color-accent:      #c0690a;
  --color-accent-hover:#a85800;
  --color-accent-dim:  rgba(192, 105, 10, 0.1);
  --color-accent-glow: rgba(192, 105, 10, 0.05);
  --color-success:     #1a8a38;
  --color-error:       #cc3333;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.06);
  --grid-color: rgba(26, 30, 40, 0.04);
}

/* ============================================
   BACKGROUND GRID
   ============================================ */
.grid-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* ============================================
   HEADER
   ============================================ */
.site-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-surface) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.logo-icon {
  flex-shrink: 0;
  color: var(--color-text-muted);
}

.logo-text {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.logo-name {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--text-lg);
  letter-spacing: 0.08em;
  color: var(--color-text);
  line-height: 1.2;
}

.logo-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  line-height: 1.3;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100dvh - 140px);
  padding: var(--space-8) var(--space-4);
}

/* ============================================
   CARD
   ============================================ */
.card-container {
  position: relative;
  width: 100%;
  max-width: 500px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-card);
}

/* Corner brackets */
.corner {
  position: absolute;
  width: 16px;
  height: 16px;
  pointer-events: none;
}
.corner::before,
.corner::after {
  content: '';
  position: absolute;
  background: var(--color-accent);
  opacity: 0.4;
}
.corner-tl { top: -1px; left: -1px; }
.corner-tl::before { top: 0; left: 0; width: 16px; height: 2px; }
.corner-tl::after  { top: 0; left: 0; width: 2px; height: 16px; }

.corner-tr { top: -1px; right: -1px; }
.corner-tr::before { top: 0; right: 0; width: 16px; height: 2px; }
.corner-tr::after  { top: 0; right: 0; width: 2px; height: 16px; }

.corner-bl { bottom: -1px; left: -1px; }
.corner-bl::before { bottom: 0; left: 0; width: 16px; height: 2px; }
.corner-bl::after  { bottom: 0; left: 0; width: 2px; height: 16px; }

.corner-br { bottom: -1px; right: -1px; }
.corner-br::before { bottom: 0; right: 0; width: 16px; height: 2px; }
.corner-br::after  { bottom: 0; right: 0; width: 2px; height: 16px; }

/* Card header */
.card-header {
  margin-bottom: var(--space-8);
  text-align: center;
}

.card-header-line {
  width: 40px;
  height: 3px;
  background: var(--color-accent);
  margin: 0 auto var(--space-5);
  border-radius: 2px;
}

.card-title {
  font-family: var(--font-body);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.card-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ============================================
   FORM
   ============================================ */
.form-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.field-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}

.label-icon {
  display: flex;
  align-items: center;
  color: var(--color-accent);
  opacity: 0.7;
}

.input-wrapper {
  position: relative;
}

.input-wrapper input {
  display: block;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  padding-right: 5rem;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
}

.input-wrapper input::placeholder {
  color: var(--color-text-faint);
}

.input-wrapper input:hover {
  border-color: var(--color-border-hover);
}

.input-wrapper input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-dim);
}

.input-wrapper input.is-invalid {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(229, 77, 77, 0.1);
}

.char-counter {
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  pointer-events: none;
  user-select: none;
}

.field-hint {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.field-hint.is-error {
  color: var(--color-error);
}

/* ============================================
   BUTTON
   ============================================ */
.btn-generate {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-4) var(--space-6);
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.btn-generate::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.btn-generate:hover:not(:disabled) {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 16px var(--color-accent-dim);
}

.btn-generate:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-generate:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-generate .btn-icon {
  flex-shrink: 0;
}

/* ============================================
   RESULT
   ============================================ */
.result-section {
  margin-top: var(--space-6);
  animation: fadeSlideIn 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

.result-section.hidden {
  display: none;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-divider {
  height: 1px;
  background: var(--color-border);
  margin-bottom: var(--space-6);
  position: relative;
}

.result-divider::after {
  content: '';
  position: absolute;
  left: 50%;
  top: -1px;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  background: var(--color-success);
  border-radius: 2px;
}

.result-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.result-header svg {
  flex-shrink: 0;
}

.result-title {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-success);
}

.hash-block {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
}

.hash-label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hash-value-wrapper {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.hash-value {
  flex: 1;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-accent);
  word-break: break-all;
  line-height: 1.6;
  letter-spacing: 0.02em;
}

.btn-copy {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  margin-top: -2px;
}

.btn-copy:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
}

.btn-copy.copied {
  color: var(--color-success);
  border-color: var(--color-success);
}

.result-message {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  padding: var(--space-3) var(--space-4);
  background: var(--color-accent-glow);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ============================================
   CNC COORDINATES (decorative)
   ============================================ */
.cnc-coords {
  display: flex;
  gap: var(--space-6);
  margin-top: var(--space-8);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  opacity: 0.5;
  letter-spacing: 0.04em;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  position: relative;
  z-index: 10;
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-6);
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ============================================
   MOBILE
   ============================================ */
@media (max-width: 600px) {
  .card-container {
    padding: var(--space-6);
  }

  .header-inner {
    padding: var(--space-3) var(--space-4);
  }

  .logo-sub {
    display: none;
  }

  .cnc-coords {
    gap: var(--space-4);
  }
}