/* ============================================
   SNIP — Design Tokens
   ============================================ */
:root {
  /* --- Color palette: warm cream + burnt orange --- */
  --clr-bg:         oklch(96% 0.01 75);
  --clr-bg-brand:   oklch(30% 0.04 55);
  --clr-surface:    oklch(98% 0.005 75);
  --clr-surface-2:  oklch(93% 0.015 75);
  --clr-border:     oklch(88% 0.02 75);
  --clr-border-focus: oklch(62% 0.17 45);

  --clr-text:       oklch(22% 0.02 55);
  --clr-text-2:     oklch(42% 0.02 55);
  --clr-text-3:     oklch(58% 0.015 55);
  --clr-text-inv:   oklch(96% 0.01 75);

  --clr-accent:     oklch(62% 0.19 45);
  --clr-accent-hover: oklch(55% 0.20 42);
  --clr-accent-subtle: oklch(90% 0.06 45);

  --clr-success:    oklch(55% 0.14 155);
  --clr-error:      oklch(55% 0.18 25);

  /* --- Typography --- */
  --ff-display: 'Fraunces', Georgia, serif;
  --ff-body: 'Instrument Sans', -apple-system, system-ui, sans-serif;

  --fs-xs:   clamp(0.72rem, 0.68rem + 0.2vw, 0.8rem);
  --fs-sm:   clamp(0.82rem, 0.78rem + 0.2vw, 0.9rem);
  --fs-base: clamp(0.95rem, 0.9rem + 0.25vw, 1.05rem);
  --fs-md:   clamp(1.1rem, 1rem + 0.5vw, 1.3rem);
  --fs-lg:   clamp(1.5rem, 1.2rem + 1.5vw, 2.2rem);
  --fs-xl:   clamp(2.5rem, 2rem + 2.5vw, 4rem);
  --fs-xxl:  clamp(3.5rem, 2.5rem + 5vw, 7rem);

  --lh-tight:  1.15;
  --lh-body:   1.55;
  --lh-loose:  1.75;

  /* --- Spacing --- */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-8: 3rem;
  --sp-10: 4rem;
  --sp-12: 5rem;
  --sp-16: 8rem;

  /* --- Radius --- */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* --- Motion --- */
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-out-expo:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out:    cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast:   120ms;
  --dur-med:    250ms;
  --dur-slow:   400ms;
  --dur-enter:  600ms;

  /* --- Layout --- */
  --brand-width: 38%;
}


/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--ff-body);
  font-size: var(--fs-base);
  font-weight: 400;
  line-height: var(--lh-body);
  color: var(--clr-text);
  background: var(--clr-bg);
  font-kerning: normal;
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
}

input, button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
}

ul {
  list-style: none;
}

::selection {
  background: var(--clr-accent-subtle);
  color: var(--clr-text);
}


/* ============================================
   Layout — Asymmetric Two Column
   ============================================ */
.layout {
  display: grid;
  grid-template-columns: var(--brand-width) 1fr;
  min-height: 100dvh;
}


/* ============================================
   Brand Column (Left)
   ============================================ */
.brand-col {
  background: var(--clr-bg-brand);
  color: var(--clr-text-inv);
  position: sticky;
  top: 0;
  height: 100dvh;
  display: flex;
  align-items: flex-end;
  padding: var(--sp-10) var(--sp-8);
  overflow: hidden;
}

.brand-inner {
  position: relative;
  z-index: 1;
}

.logo {
  font-family: var(--ff-display);
  font-size: var(--fs-xxl);
  font-weight: 300;
  line-height: var(--lh-tight);
  letter-spacing: -0.03em;
  font-style: normal;
  font-optical-sizing: auto;
}

.logo-dot {
  color: var(--clr-accent);
  font-weight: 700;
}

.tagline {
  font-size: var(--fs-md);
  font-weight: 400;
  line-height: var(--lh-body);
  margin-top: var(--sp-4);
  opacity: 0.7;
}

/* Decorative circle */
.brand-decoration {
  position: absolute;
  top: -60%;
  right: -40%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  border: 1px solid oklch(96% 0.01 75 / 0.08);
  pointer-events: none;
}

.brand-decoration::after {
  content: '';
  position: absolute;
  top: 15%;
  left: 15%;
  width: 70%;
  height: 70%;
  border-radius: 50%;
  border: 1px solid oklch(96% 0.01 75 / 0.05);
}


/* ============================================
   App Column (Right)
   ============================================ */
.app-col {
  display: flex;
  flex-direction: column;
  padding: var(--sp-10) clamp(var(--sp-6), 5vw, var(--sp-16));
  max-width: 720px;
}


/* ============================================
   Tab Bar
   ============================================ */
.tab-bar {
  display: inline-flex;
  position: relative;
  background: var(--clr-surface-2);
  border-radius: var(--radius-full);
  padding: 4px;
  gap: 2px;
  align-self: flex-start;
  margin-bottom: var(--sp-10);
}

.tab {
  position: relative;
  z-index: 1;
  padding: var(--sp-2) var(--sp-5);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--clr-text-3);
  border-radius: var(--radius-full);
  transition: color var(--dur-med) var(--ease-out-quart);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.tab:hover {
  color: var(--clr-text-2);
}

.tab.active {
  color: var(--clr-text);
}

.tab-indicator {
  position: absolute;
  top: 4px;
  left: 4px;
  height: calc(100% - 8px);
  background: var(--clr-surface);
  border-radius: var(--radius-full);
  box-shadow: 0 1px 3px oklch(22% 0.02 55 / 0.08);
  transition: transform var(--dur-slow) var(--ease-out-expo),
              width var(--dur-slow) var(--ease-out-expo);
  z-index: 0;
}


/* ============================================
   Panels
   ============================================ */
.panel {
  display: none;
  animation: panelIn var(--dur-enter) var(--ease-out-expo) both;
}

.panel.active {
  display: block;
}

@keyframes panelIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* ============================================
   Input Group
   ============================================ */
.input-label {
  display: block;
  font-family: var(--ff-display);
  font-size: var(--fs-lg);
  font-weight: 500;
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  margin-bottom: var(--sp-5);
  color: var(--clr-text);
}

.input-row {
  display: flex;
  gap: var(--sp-3);
  align-items: stretch;
}

.text-input {
  flex: 1;
  padding: var(--sp-3) var(--sp-4);
  font-size: var(--fs-base);
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-md);
  transition: border-color var(--dur-med) var(--ease-out-quart),
              box-shadow var(--dur-med) var(--ease-out-quart);
  min-width: 0;
}

.text-input::placeholder {
  color: var(--clr-text-3);
}

.text-input:focus {
  border-color: var(--clr-border-focus);
  box-shadow: 0 0 0 3px oklch(62% 0.17 45 / 0.12);
}

.text-input.error {
  border-color: var(--clr-error);
  box-shadow: 0 0 0 3px oklch(55% 0.18 25 / 0.1);
}


/* ============================================
   Buttons
   ============================================ */
.primary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-5);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--clr-text-inv);
  background: var(--clr-accent);
  border-radius: var(--radius-md);
  transition: background var(--dur-fast) var(--ease-out-quart),
              transform var(--dur-fast) var(--ease-out-quart);
  white-space: nowrap;
  flex-shrink: 0;
}

.primary-btn:hover {
  background: var(--clr-accent-hover);
}

.primary-btn:active {
  transform: scale(0.97);
}

.primary-btn.loading .btn-text {
  opacity: 0;
}

.primary-btn.loading .btn-loader {
  display: block;
}

.btn-loader {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid oklch(96% 0.01 75 / 0.3);
  border-top-color: var(--clr-text-inv);
  border-radius: 50%;
  animation: spin 600ms linear infinite;
  position: absolute;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.ghost-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--clr-accent);
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast) var(--ease-out-quart),
              color var(--dur-fast) var(--ease-out-quart);
}

.ghost-btn:hover {
  background: var(--clr-accent-subtle);
  color: var(--clr-accent-hover);
}

.ghost-btn:active {
  transform: scale(0.97);
}

.icon {
  flex-shrink: 0;
}


/* ============================================
   Shorten Result
   ============================================ */
.result-area {
  margin-top: var(--sp-8);
  animation: resultIn var(--dur-enter) var(--ease-out-expo) both;
}

@keyframes resultIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-card {
  padding: var(--sp-5);
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-left: 3px solid var(--clr-accent);
  border-radius: var(--radius-md);
}

.result-label {
  display: block;
  font-size: var(--fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--clr-text-3);
  margin-bottom: var(--sp-2);
}

.result-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
}

.short-url {
  font-family: var(--ff-display);
  font-size: var(--fs-md);
  font-weight: 500;
  color: var(--clr-accent);
  word-break: break-all;
}

.copy-text {
  transition: opacity var(--dur-fast);
}

/* Copied state */
.ghost-btn.copied {
  color: var(--clr-success);
}

.ghost-btn.copied .copy-text::after {
  content: '✓';
  margin-left: var(--sp-1);
}


/* ============================================
   History
   ============================================ */
.history-section {
  margin-top: var(--sp-10);
  animation: resultIn var(--dur-enter) var(--ease-out-expo) 0.1s both;
}

.section-title {
  font-family: var(--ff-display);
  font-size: var(--fs-base);
  font-weight: 500;
  color: var(--clr-text-2);
  margin-bottom: var(--sp-4);
  font-style: italic;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.history-item {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast) var(--ease-out-quart);
  animation: historyItemIn var(--dur-slow) var(--ease-out-expo) both;
  animation-delay: calc(var(--i, 0) * 50ms);
}

@keyframes historyItemIn {
  from {
    opacity: 0;
    transform: translateX(-8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.history-item:hover {
  background: var(--clr-surface-2);
}

.history-original {
  font-size: var(--fs-sm);
  color: var(--clr-text-3);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.history-clicks {
  font-size: var(--fs-xs);
  font-weight: 500;
  color: var(--clr-text-3);
  background: var(--clr-surface-2);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  transition: transform var(--dur-med) var(--ease-out-quart),
              background var(--dur-med) var(--ease-out-quart),
              color var(--dur-med) var(--ease-out-quart);
}

.history-clicks.updated {
  transform: scale(1.15);
  background: var(--clr-accent-subtle);
  color: var(--clr-accent);
}

.history-short {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--clr-accent);
  white-space: nowrap;
}

.history-copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  color: var(--clr-text-3);
  transition: color var(--dur-fast), background var(--dur-fast);
}

.history-copy-btn:hover {
  color: var(--clr-accent);
  background: var(--clr-accent-subtle);
}

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


/* ============================================
   QR Code Result
   ============================================ */
.qr-result-area {
  margin-top: var(--sp-8);
  animation: resultIn var(--dur-enter) var(--ease-out-expo) both;
}

.qr-canvas-wrap {
  display: inline-block;
  padding: var(--sp-6);
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-lg);
}

.qr-canvas-wrap canvas,
.qr-canvas-wrap img {
  display: block;
  border-radius: var(--radius-sm);
}

.qr-meta {
  margin-top: var(--sp-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}

.qr-source {
  font-size: var(--fs-sm);
  color: var(--clr-text-3);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
  max-width: 55%;
}


/* ============================================
   Footer
   ============================================ */
.app-footer {
  margin-top: auto;
  padding-top: var(--sp-10);
}

.app-footer p {
  font-size: var(--fs-xs);
  color: var(--clr-text-3);
}


/* ============================================
   Page Load Animation
   ============================================ */
@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.brand-inner {
  animation: fadeSlideUp 800ms var(--ease-out-expo) 200ms both;
}

.tab-bar {
  animation: fadeSlideUp 600ms var(--ease-out-expo) 400ms both;
}

.panel-content {
  animation: fadeSlideUp 600ms var(--ease-out-expo) 550ms both;
}

.app-footer {
  animation: fadeSlideUp 500ms var(--ease-out-expo) 700ms both;
}


/* ============================================
   Reduced Motion
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }
}


/* ============================================
   Responsive
   ============================================ */
@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .brand-col {
    position: relative;
    height: auto;
    padding: var(--sp-8) var(--sp-6) var(--sp-6);
    align-items: flex-start;
  }

  .logo {
    font-size: var(--fs-xl);
  }

  .brand-decoration {
    display: none;
  }

  .tagline br {
    display: none;
  }

  .app-col {
    padding: var(--sp-6);
  }
}

@media (max-width: 500px) {
  .input-row {
    flex-direction: column;
  }

  .primary-btn {
    width: 100%;
    padding: var(--sp-3) var(--sp-4);
  }

  .result-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .history-item {
    grid-template-columns: 1fr auto auto;
  }

  .history-original {
    grid-column: 1 / -1;
  }

  .qr-meta {
    flex-direction: column;
    align-items: flex-start;
  }

  .qr-source {
    max-width: 100%;
  }
}