/* ==========================================================================
   Campaign Frame Studio -- stylesheet
   Design tokens first, then layout, then components, then responsive rules.
   ========================================================================== */

:root{
  /* --- color: light mode --- */
  --bg:            #F7F7FA;
  --surface:       #FFFFFF;
  --surface-2:     #F0F1F5;
  --ink:           #14161A;
  --ink-soft:      #55586326;
  --ink-muted:     #6B6E78;
  --border:        #E3E4EA;
  --primary:       #3A5BFF;
  --primary-dark:  #2540C9;
  --primary-tint:  #EDF0FF;
  --accent:        #FF6B4A;
  --accent-tint:   #FFEDE8;
  --shadow-color:  220deg 30% 15%;

  /* --- type --- */
  --font-display: 'Poppins', 'Segoe UI', system-ui, sans-serif;
  --font-body:    'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;

  /* --- shape / motion --- */
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-pill: 999px;
  --ease: cubic-bezier(.22,.8,.32,1);
  --dur: .25s;
}

[data-theme="dark"]{
  --bg:            #101114;
  --surface:       #1B1C21;
  --surface-2:     #232429;
  --ink:           #F2F2F4;
  --ink-muted:     #A6A8B3;
  --border:        #2C2D34;
  --primary:       #7C93FF;
  --primary-dark:  #A9B7FF;
  --primary-tint:  #23264A;
  --accent:        #FF8B6E;
  --accent-tint:   #3A2620;
  --shadow-color:  220deg 60% 2%;
}

@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{ animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

/* ---------------------------- base ---------------------------- */
*{ box-sizing: border-box; }

html{ scroll-behavior: smooth; }

body{
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

h1, h2, h3, h4{
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.35;
  margin: 0 0 .5em;
  letter-spacing: -0.01em;
}

p{ margin: 0 0 1em; color: var(--ink); }

a{ color: var(--primary); }

.skip-link{
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--primary);
  color: #fff;
  padding: .75rem 1.25rem;
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 1000;
}
.skip-link:focus{ left: 0; }

:focus-visible{
  outline: 3px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.container{ max-width: 1180px; margin-inline: auto; padding-inline: 1.25rem; }

/* ---------------------------- buttons ---------------------------- */
.btn{
  font-family: var(--font-body);
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
  border: none;
}
.btn-pill{ border-radius: var(--radius-pill); }
.btn-primary{
  background: var(--primary);
  color: #fff;
  box-shadow: 0 10px 24px -8px hsl(var(--shadow-color) / .55);
}
.btn-primary:hover{ background: var(--primary-dark); transform: translateY(-1px); color:#fff; }
.btn-primary:active{ transform: translateY(0); }
.btn-ghost{
  background: transparent;
  color: var(--ink);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover{ background: var(--surface-2); color: var(--ink); }
.btn-icon{ width: 18px; height: 18px; margin-right: .4rem; vertical-align: -3px; fill:none; stroke:currentColor; stroke-width:2; stroke-linecap:round; stroke-linejoin:round; }
.w-100{ width: 100%; }

/* ---------------------------- header ---------------------------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: .85rem;
}
.brand{ display: flex; align-items: center; gap: .6rem; text-decoration: none; color: var(--ink); }
.brand-mark{ border-radius: 50%; }
.brand-name{ font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; }
.brand-name sup{ font-size: .6em; }

.theme-toggle{
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.theme-toggle:hover{ transform: rotate(12deg); }
.theme-toggle .icon{ width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; grid-area: 1/1; }
.icon-moon{ display: none; }
[data-theme="dark"] .icon-sun{ display: none; }
[data-theme="dark"] .icon-moon{ display: block; }

/* ---------------------------- hero ---------------------------- */
.hero{ padding-block: clamp(2.5rem, 6vw, 5.5rem); }
.hero-grid{
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.eyebrow{
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .9rem;
}
.hero h1{ font-size: clamp(1.55rem, 5.2vw, 3.4rem); margin-bottom: .55em; overflow-wrap: break-word; word-break: break-word; }
.hero-lede{ color: var(--ink-muted); font-size: 1.08rem; max-width: 46ch; }
.hero-actions{ margin-top: 1.6rem; display: flex; flex-direction: column; align-items: flex-start; gap: .65rem; }
.hero-hint{ font-size: .85rem; color: var(--ink-muted); }

.hero-visual{ display: flex; justify-content: center; }
.hero-frame-demo{
  position: relative;
  width: min(360px, 80vw);
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(155deg, var(--primary-tint), var(--surface) 60%);
  box-shadow: 0 30px 60px -20px hsl(var(--shadow-color) / .5);
  display: grid;
  place-items: center;
  animation: floatY 6s var(--ease) infinite;
}
.hero-frame-demo-img{ width: 82%; height: 82%; object-fit: contain; filter: drop-shadow(0 10px 18px hsl(var(--shadow-color)/.35)); }
.hero-frame-demo-glow{
  position: absolute; inset: 10%;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-tint), transparent 70%);
  z-index: -1;
  opacity: .8;
}
@keyframes floatY{
  0%,100%{ transform: translateY(0); }
  50%{ transform: translateY(-10px); }
}

/* ---------------------------- drop zone ---------------------------- */
.upload-zone-section{ margin-block: 1rem 3rem; }
.drop-zone{
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  padding: clamp(2rem, 6vw, 3.5rem) 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.drop-zone:hover, .drop-zone:focus-visible{ border-color: var(--primary); background: var(--primary-tint); }
.drop-zone.drag-over{ border-color: var(--accent); background: var(--accent-tint); transform: scale(1.01); }
.drop-icon{ width: 40px; height: 40px; stroke: var(--primary); fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; margin-bottom: .5rem; }
.drop-title{ font-weight: 600; font-size: 1.05rem; margin-bottom: .2rem; }
.drop-sub{ color: var(--ink-muted); font-size: .9rem; margin: 0; }

/* ---------------------------- editor ---------------------------- */
.editor-section{ padding-block: 1rem 4rem; }
.editor-heading{ text-align: center; margin-bottom: 1.75rem; }

.editor-grid{
  display: grid;
  grid-template-columns: 200px minmax(0,1fr) 260px;
  gap: 1.5rem;
  align-items: start;
}

.panel-title{
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--ink-muted);
  margin-bottom: .75rem;
}

/* frame picker */
.frame-picker{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.1rem;
}
.frame-list{ display: flex; flex-direction: column; gap: .75rem; }
.frame-option{
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  padding: .5rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .4rem;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.frame-option img{ width: 100%; aspect-ratio: 1; object-fit: contain; }
.frame-option span{ font-size: .78rem; color: var(--ink-muted); }
.frame-option:hover{ transform: translateY(-2px); }
.frame-option.is-selected{ border-color: var(--primary); background: var(--primary-tint); }
.frame-option.is-selected span{ color: var(--primary); font-weight: 600; }

/* stage / canvas */
.stage-wrap{ display: flex; flex-direction: column; align-items: center; gap: .75rem; }
.stage{
  position: relative;
  width: min(520px, 100%);
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  background:
    repeating-conic-gradient(var(--surface-2) 0% 25%, var(--surface) 0% 50%) 50% / 24px 24px;
  box-shadow: 0 24px 48px -20px hsl(var(--shadow-color) / .45);
  touch-action: none;
  scroll-margin-top: 78px;
}
.cropper-shell{ position: absolute; inset: 0; }
.cropper-shell img{ display: block; max-width: 100%; }
.frame-overlay{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
  z-index: 5;
}
.viewfinder{ position: absolute; inset: 0; pointer-events: none; z-index: 6; }
.vf-corner{
  position: absolute;
  width: 22px; height: 22px;
  border-color: var(--accent);
  opacity: .85;
}
.vf-tl{ top: 10px; left: 10px; border-top: 3px solid; border-left: 3px solid; border-radius: 6px 0 0 0;}
.vf-tr{ top: 10px; right: 10px; border-top: 3px solid; border-right: 3px solid; border-radius: 0 6px 0 0;}
.vf-bl{ bottom: 10px; left: 10px; border-bottom: 3px solid; border-left: 3px solid; border-radius: 0 0 0 6px;}
.vf-br{ bottom: 10px; right: 10px; border-bottom: 3px solid; border-right: 3px solid; border-radius: 0 0 6px 0;}

.stage-caption{ font-size: .82rem; color: var(--ink-muted); font-family: var(--font-mono); }

/* tool panel */
.tool-panel{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}
.tool-group{ display: flex; flex-direction: column; gap: .5rem; }
.tool-label{ font-size: .85rem; color: var(--ink-muted); }
.tool-buttons{ display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.tool-btn{
  display: flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .6rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--surface-2);
  color: var(--ink);
  cursor: pointer;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.tool-btn svg{ width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tool-btn:hover{ border-color: var(--primary); background: var(--primary-tint); transform: translateY(-1px); }
.tool-btn-wide{ grid-column: 1 / -1; }

.privacy-note{
  display: flex; align-items: flex-start; gap: .5rem;
  font-size: .78rem; color: var(--ink-muted);
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: .6rem .7rem;
  margin: 0;
}
.privacy-note svg{ width: 16px; height: 16px; flex-shrink: 0; margin-top: 2px; fill: none; stroke: var(--primary); stroke-width: 1.8; }

/* range input theming */
.form-range::-webkit-slider-thumb{ background: var(--primary); }
.form-range::-moz-range-thumb{ background: var(--primary); }
.form-range::-webkit-slider-runnable-track{ background: var(--border); }

/* ---------------------------- about ---------------------------- */
.about-section{ padding-block: 1rem 5rem; }
.about-grid{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.about-card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}
.about-card h3{ font-size: 1.05rem; margin-bottom: .4rem; }
.about-card p{ color: var(--ink-muted); font-size: .92rem; margin: 0; }

/* ---------------------------- footer ---------------------------- */
.site-footer{ border-top: 1px solid var(--border); padding-block: 1.75rem; }
.footer-inner{ display: flex; flex-direction: column; align-items: center; gap: .35rem; text-align: center; }
.footer-logo{ height: auto; margin-bottom: .4rem; opacity: .92; }
.footer-inner p{ margin: 0; font-size: .85rem; color: var(--ink-muted); }
.footer-sub{ font-size: .8rem !important; }

/* ---------------------------- toast ---------------------------- */
.toast-msg{
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translate(-50%, 20px);
  background: var(--ink);
  color: var(--bg);
  padding: .75rem 1.25rem;
  border-radius: var(--radius-pill);
  font-size: .9rem;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  z-index: 100;
  box-shadow: 0 16px 32px -12px hsl(var(--shadow-color) / .6);
}
.toast-msg.is-visible{ opacity: 1; transform: translate(-50%, 0); pointer-events: auto; }

/* ---------------------------- mobile save dialog ---------------------------- */
.save-modal{
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 1rem;
}
.save-modal[hidden]{ display: none; }
.save-modal-backdrop{
  position: absolute;
  inset: 0;
  background: rgb(0 0 0 / .72);
}
.save-modal-card{
  position: relative;
  width: min(560px, 100%);
  max-height: calc(100dvh - 2rem);
  overflow-y: auto;
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  text-align: center;
  box-shadow: 0 24px 70px rgb(0 0 0 / .35);
}
.save-modal-card h2{ font-size: 1.25rem; margin-bottom: .35rem; }
.save-modal-close{
  position: absolute;
  top: .45rem;
  right: .6rem;
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 50%;
  background: var(--surface-2);
  color: var(--ink);
  font-size: 1.8rem;
  line-height: 1;
}
.save-modal-instruction{ color: var(--ink-muted); font-size: .92rem; padding-inline: 1.5rem; }
.save-preview-image{
  display: block;
  width: min(100%, 440px);
  height: auto;
  margin: .8rem auto;
  border-radius: var(--radius-sm);
  -webkit-touch-callout: default;
  user-select: auto;
  -webkit-user-select: auto;
}
.line-browser-hint{
  margin: .75rem 0;
  padding: .7rem;
  border-radius: var(--radius-sm);
  background: var(--accent-tint);
  color: var(--ink);
  font-size: .86rem;
}
.save-modal-actions{ display: grid; gap: .65rem; margin-top: .85rem; }
.save-modal-actions .btn{ min-height: 46px; }
body.save-modal-open{ overflow: hidden; }

/* ---------------------------- responsive ---------------------------- */
@media (max-width: 992px){
  .editor-grid{ grid-template-columns: 1fr; }
  .frame-picker{
    order: 2;
  }
  .frame-list{ flex-direction: row; overflow-x: auto; padding-bottom: .3rem; }
  .frame-option{ min-width: 110px; }
  .stage-wrap{ order: 1; }
  .tool-panel{ order: 3; }
}

@media (max-width: 768px){
  .container{ padding-inline: .75rem; }
  .editor-section{ padding-top: .35rem; }
  .editor-heading{ margin-bottom: .8rem; font-size: 1.25rem; }
  .editor-grid{ gap: 1rem; }
  .stage{ width: 100%; border-radius: 14px; scroll-margin-top: 74px; }
  .stage-caption{ margin-bottom: 0; text-align: center; }
  .hero-grid{ grid-template-columns: 1fr; text-align: center; }
  .hero-actions{ align-items: center; }
  .hero-lede{ margin-inline: auto; }
  .about-grid{ grid-template-columns: 1fr; }
}