/*
  glass.css — shared "Liquid Glass" design system
  Used independently by to-image.com (site/) and watermark.to-image.com (watermark/).
  This file is intentionally duplicated in both folders (not imported cross-origin)
  so each static site stays fully self-contained and deployable on its own.

  Contains: design tokens (light/dark), base layout helpers, glass panels,
  buttons, form controls (range/checkbox/select), badges, nav, footer.
*/

/* ---------------------------------------------------------------------- */
/* Design tokens — light theme (default)                                  */
/* ---------------------------------------------------------------------- */
:root {
  color-scheme: light;

  /* backdrop */
  --page-bg-1: #eef2f9;
  --page-bg-2: #e3e9f7;
  --blob-a: #93c5fd;
  --blob-b: #c4b5fd;
  --blob-c: #fbcfe8;
  --blob-d: #99f6e4;

  /* text */
  --text-primary: #0f1522;
  --text-secondary: #4c5566;
  --text-tertiary: #78849a;
  --text-on-accent: #ffffff;

  /* glass surfaces */
  --glass-bg-solid: rgba(255, 255, 255, 0.88);   /* no-backdrop-filter fallback */
  --glass-bg: rgba(255, 255, 255, 0.52);          /* with blur */
  --glass-bg-strong: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.85);
  --glass-border-soft: rgba(140, 150, 175, 0.22);
  --glass-highlight: rgba(255, 255, 255, 0.95);
  --glass-shadow: 222 55% 35%;

  /* controls */
  --track-bg: rgba(120, 130, 155, 0.22);
  --track-bg-solid: rgba(120, 130, 155, 0.28);

  /* accent */
  --accent-1: #2f6fed;
  --accent-2: #7c5cf0;
  --accent-gradient: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  --danger: #e0455c;
  --success: #17a673;

  --radius-lg: 26px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --radius-pill: 999px;

  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
    Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;

    --page-bg-1: #0a0d16;
    --page-bg-2: #121727;
    --blob-a: #1e40af;
    --blob-b: #5b21b6;
    --blob-c: #9d174d;
    --blob-d: #0f766e;

    --text-primary: #f3f5fa;
    --text-secondary: #aab2c5;
    --text-tertiary: #7c8598;
    --text-on-accent: #ffffff;

    --glass-bg-solid: rgba(20, 23, 34, 0.9);
    --glass-bg: rgba(28, 32, 46, 0.46);
    --glass-bg-strong: rgba(28, 32, 46, 0.68);
    --glass-border: rgba(255, 255, 255, 0.14);
    --glass-border-soft: rgba(255, 255, 255, 0.08);
    --glass-highlight: rgba(255, 255, 255, 0.14);
    --glass-shadow: 230 70% 3%;

    --track-bg: rgba(255, 255, 255, 0.14);
    --track-bg-solid: rgba(255, 255, 255, 0.18);

    --accent-1: #6699ff;
    --accent-2: #a78bfa;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --page-bg-1: #0a0d16;
  --page-bg-2: #121727;
  --blob-a: #1e40af;
  --blob-b: #5b21b6;
  --blob-c: #9d174d;
  --blob-d: #0f766e;

  --text-primary: #f3f5fa;
  --text-secondary: #aab2c5;
  --text-tertiary: #7c8598;
  --text-on-accent: #ffffff;

  --glass-bg-solid: rgba(20, 23, 34, 0.9);
  --glass-bg: rgba(28, 32, 46, 0.46);
  --glass-bg-strong: rgba(28, 32, 46, 0.68);
  --glass-border: rgba(255, 255, 255, 0.14);
  --glass-border-soft: rgba(255, 255, 255, 0.08);
  --glass-highlight: rgba(255, 255, 255, 0.14);
  --glass-shadow: 230 70% 3%;

  --track-bg: rgba(255, 255, 255, 0.14);
  --track-bg-solid: rgba(255, 255, 255, 0.18);

  --accent-1: #6699ff;
  --accent-2: #a78bfa;
}

/* ---------------------------------------------------------------------- */
/* Reset / base                                                           */
/* ---------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-system);
  color: var(--text-primary);
  background: var(--page-bg-1);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

button {
  font-family: inherit;
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------------------------------------------------------------------- */
/* Decorative background — soft gradient blobs the glass panels can       */
/* blur/refract. Fixed, behind everything, non-interactive.               */
/* ---------------------------------------------------------------------- */
.bg-scene {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: linear-gradient(160deg, var(--page-bg-1), var(--page-bg-2));
}

.bg-scene span {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.55;
  will-change: transform;
}

.bg-scene span:nth-child(1) {
  width: 46vw;
  height: 46vw;
  top: -12vw;
  left: -10vw;
  background: var(--blob-a);
  animation: drift-a 26s ease-in-out infinite;
}
.bg-scene span:nth-child(2) {
  width: 38vw;
  height: 38vw;
  top: 10vh;
  right: -12vw;
  background: var(--blob-b);
  animation: drift-b 32s ease-in-out infinite;
}
.bg-scene span:nth-child(3) {
  width: 34vw;
  height: 34vw;
  bottom: -14vw;
  left: 18vw;
  background: var(--blob-c);
  animation: drift-c 30s ease-in-out infinite;
}
.bg-scene span:nth-child(4) {
  width: 26vw;
  height: 26vw;
  bottom: 6vh;
  right: 8vw;
  background: var(--blob-d);
  animation: drift-a 24s ease-in-out infinite reverse;
}

@keyframes drift-a {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(4vw, 3vh) scale(1.08); }
}
@keyframes drift-b {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-3vw, 4vh) scale(0.95); }
}
@keyframes drift-c {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(3vw, -3vh) scale(1.06); }
}

/* ---------------------------------------------------------------------- */
/* Glass panel — the core material                                       */
/* ---------------------------------------------------------------------- */
.glass {
  position: relative;
  background: var(--glass-bg-solid);
  border: 1px solid var(--glass-border-soft);
  border-radius: var(--radius-lg);
  box-shadow: 0 1px 1px hsl(var(--glass-shadow) / 0.06),
    0 8px 24px hsl(var(--glass-shadow) / 0.12),
    0 24px 48px -12px hsl(var(--glass-shadow) / 0.18);
  isolation: isolate;
}

@supports (backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px)) {
  .glass {
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid var(--glass-border);
  }
}

/* specular highlight near the top edge, like light catching glass */
.glass::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(
    160deg,
    var(--glass-highlight) 0%,
    transparent 30%,
    transparent 70%,
    var(--glass-border-soft) 100%
  );
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.6;
  pointer-events: none;
  z-index: 1;
}

/* soft inner sheen used by larger panels */
.glass::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.35) 0%,
    rgba(255, 255, 255, 0) 40%
  );
  opacity: 0.5;
  pointer-events: none;
  z-index: 0;
  mix-blend-mode: overlay;
}

:root[data-theme="dark"] .glass::after {
  mix-blend-mode: soft-light;
  opacity: 0.35;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .glass::after {
    mix-blend-mode: soft-light;
    opacity: 0.35;
  }
}

.glass > * {
  position: relative;
  z-index: 2;
}

.glass-strong {
  background: var(--glass-bg-solid);
}
@supports (backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px)) {
  .glass-strong {
    background: var(--glass-bg-strong);
  }
}

.glass-panel {
  padding: clamp(20px, 3vw, 32px);
}

.glass-card {
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: var(--radius-md);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.glass-card:hover {
  transform: translateY(-2px);
}

/* ---------------------------------------------------------------------- */
/* Buttons — frosted glass capsules                                      */
/* ---------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1;
  padding: 13px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border-soft);
  cursor: pointer;
  color: var(--text-primary);
  background: var(--glass-bg-solid);
  box-shadow: 0 1px 1px hsl(var(--glass-shadow) / 0.06),
    0 6px 16px hsl(var(--glass-shadow) / 0.12);
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

@supports (backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px)) {
  .btn {
    background: var(--glass-bg-strong);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    backdrop-filter: blur(16px) saturate(180%);
    border: 1px solid var(--glass-border);
  }
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 4px hsl(var(--glass-shadow) / 0.08),
    0 10px 22px hsl(var(--glass-shadow) / 0.16);
}

.btn:active {
  transform: translateY(0) scale(0.98);
}

.btn:focus-visible {
  outline: 2px solid var(--accent-1);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  color: var(--text-on-accent);
  background: var(--accent-gradient);
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.btn-primary:hover {
  filter: brightness(1.06);
}

.btn-block {
  width: 100%;
}

.btn svg {
  width: 18px;
  height: 18px;
  flex: none;
}

/* icon-only round glass button (e.g. theme toggle) */
.btn-icon {
  padding: 10px;
  border-radius: var(--radius-pill);
  width: 42px;
  height: 42px;
}

/* ---------------------------------------------------------------------- */
/* Badges / trust signal pills                                           */
/* ---------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  background: var(--glass-bg-solid);
  border: 1px solid var(--glass-border-soft);
}

@supports (backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px)) {
  .badge {
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(14px) saturate(160%);
    backdrop-filter: blur(14px) saturate(160%);
    border: 1px solid var(--glass-border);
  }
}

.badge svg {
  width: 16px;
  height: 16px;
  flex: none;
  color: var(--success);
}

.badge-strong {
  color: var(--text-primary);
  font-weight: 700;
}

/* ---------------------------------------------------------------------- */
/* Nav                                                                    */
/* ---------------------------------------------------------------------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 14px clamp(16px, 4vw, 40px);
}

.site-nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.05rem;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: var(--accent-gradient);
  display: grid;
  place-items: center;
  color: #fff;
  flex: none;
}

.brand-mark svg {
  width: 18px;
  height: 18px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text-primary);
  background: var(--glass-border-soft);
}

/* ---------------------------------------------------------------------- */
/* Theme toggle                                                           */
/* ---------------------------------------------------------------------- */
.theme-toggle {
  position: relative;
  display: inline-flex;
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

/* ---------------------------------------------------------------------- */
/* Form controls                                                          */
/* ---------------------------------------------------------------------- */
label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.field {
  margin-bottom: 18px;
}

.field-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

.field-row label {
  margin-bottom: 0;
}

.field-value {
  font-variant-numeric: tabular-nums;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  background: var(--glass-border-soft);
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  min-width: 3.4em;
  text-align: center;
}

input[type="text"],
input[type="number"],
select {
  width: 100%;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text-primary);
  background: var(--track-bg-solid);
  border: 1px solid var(--glass-border-soft);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
  outline: none;
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px hsl(222 90% 60% / 0.22);
}

select {
  appearance: none;
  -webkit-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--text-secondary) 50%),
    linear-gradient(135deg, var(--text-secondary) 50%, transparent 50%);
  background-position: calc(100% - 18px) center, calc(100% - 13px) center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 34px;
}

/* Range slider — glass capsule track + lensed thumb */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 28px;
  background: transparent;
  cursor: pointer;
  margin: 0;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--track-bg-solid);
  border: 1px solid var(--glass-border-soft);
}

input[type="range"]::-moz-range-track {
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--track-bg-solid);
  border: 1px solid var(--glass-border-soft);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  margin-top: -8px;
  border-radius: 50%;
  background: linear-gradient(160deg, #ffffff, #dbe3f5);
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 2px 3px hsl(var(--glass-shadow) / 0.18), 0 6px 14px hsl(var(--glass-shadow) / 0.2);
  transition: transform 0.12s ease;
}

input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(160deg, #ffffff, #dbe3f5);
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 2px 3px hsl(var(--glass-shadow) / 0.18), 0 6px 14px hsl(var(--glass-shadow) / 0.2);
}

input[type="range"]:focus-visible::-webkit-slider-thumb {
  outline: 2px solid var(--accent-1);
  outline-offset: 2px;
}

input[type="range"]::-webkit-slider-thumb:active {
  transform: scale(1.12);
}

input[type="range"]:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Checkbox → glass toggle switch */
.switch {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  margin-bottom: 14px;
}

.switch input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.switch-track {
  position: relative;
  width: 46px;
  height: 27px;
  border-radius: var(--radius-pill);
  background: var(--track-bg-solid);
  border: 1px solid var(--glass-border-soft);
  transition: background 0.2s ease;
  flex: none;
}

.switch-track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 21px;
  height: 21px;
  border-radius: 50%;
  background: linear-gradient(160deg, #ffffff, #dbe3f5);
  box-shadow: 0 2px 4px hsl(var(--glass-shadow) / 0.25);
  transition: transform 0.2s ease;
}

.switch input:checked + .switch-track {
  background: var(--accent-gradient);
  border-color: transparent;
}

.switch input:checked + .switch-track::after {
  transform: translateX(19px);
}

.switch input:focus-visible + .switch-track {
  outline: 2px solid var(--accent-1);
  outline-offset: 2px;
}

.switch-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Segmented control (used for the 9-point position grid, format choice…) */
.segmented {
  display: inline-flex;
  padding: 4px;
  border-radius: var(--radius-pill);
  background: var(--track-bg-solid);
  border: 1px solid var(--glass-border-soft);
  gap: 2px;
}

.segmented button {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.segmented button:hover {
  color: var(--text-primary);
}

.segmented button[aria-pressed="true"] {
  background: var(--accent-gradient);
  color: var(--text-on-accent);
}

.segmented button:focus-visible {
  outline: 2px solid var(--accent-1);
  outline-offset: 2px;
}

/* ---------------------------------------------------------------------- */
/* Footer                                                                 */
/* ---------------------------------------------------------------------- */
.site-footer {
  margin-top: clamp(40px, 8vw, 90px);
  padding: 28px clamp(16px, 4vw, 40px) 48px;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 0.85rem;
}

.site-footer a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
}

.site-footer a:hover {
  color: var(--accent-1);
}

/* ---------------------------------------------------------------------- */
/* Utility                                                                */
/* ---------------------------------------------------------------------- */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 40px);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 100;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 16px;
}