/* ═══════════════════════════════════════════════════════════
   dropLake — UI  (glassmorphism · Inter · spring transitions)
   ═══════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ── Tokens ─────────────────────────────────────────────── */
:root {
  --bg:           #05050d;
  --glass:        rgba(255,255,255,0.028);
  --glass-hi:     rgba(255,255,255,0.055);
  --border:       rgba(255,255,255,0.08);
  --border-hi:    rgba(255,255,255,0.15);
  --border-focus: rgba(91,140,247,0.55);

  --text:         #eaeaf5;
  --muted:        #6464888;
  --muted:        #636382;

  --accent:       #5b8cf7;
  --accent-2:     #9b6df5;
  --success:      #24d47a;
  --error:        #f05858;
  --warning:      #f5a623;

  --glow-a:       rgba(91,140,247,0.28);
  --glow-s:       rgba(36,212,122,0.22);

  --r-sm:   8px;
  --r-md:   12px;
  --r-lg:   20px;

  --ease:    cubic-bezier(0.4, 0, 0.2, 1);
  --spring:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --t-fast:  0.14s;
  --t-med:   0.26s;
  --t-slow:  0.45s;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'SFMono-Regular', 'Fira Code', 'Consolas', monospace;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3rem 1rem 4rem;
  overflow-x: hidden;
}

/* Atmospheric glow */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 88% 52% at 50% -4%,  rgba(91,140,247,0.11) 0%, transparent 66%),
    radial-gradient(ellipse 48% 30% at 88% 88%,  rgba(155,109,245,0.07) 0%, transparent 58%),
    radial-gradient(ellipse 38% 22% at 8% 72%,   rgba(91,140,247,0.04) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* ── Layout ──────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 560px;
  position: relative;
  z-index: 1;
}

/* ── Logo ────────────────────────────────────────────────── */
.logo {
  text-align: center;
  margin-bottom: 2.25rem;
  animation: fadeDown var(--t-slow) var(--ease) both;
}
.logo-mark {
  display: inline-block;
  font-size: 1.55rem;
  margin-bottom: 0.45rem;
  filter: drop-shadow(0 0 14px rgba(91,140,247,0.65));
  animation: floatMark 5s ease-in-out infinite;
}
.logo h1 {
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--text);
}
.logo h1 .grad {
  background: linear-gradient(130deg, var(--accent) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo p {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 400;
  margin-top: 0.35rem;
  letter-spacing: 0.04em;
}

/* ── Card ────────────────────────────────────────────────── */
.card {
  background: var(--glass);
  border: 1px solid var(--border);
  border-top-color: rgba(255,255,255,0.13);
  border-radius: var(--r-lg);
  padding: 1.75rem;
  backdrop-filter: blur(24px) saturate(1.4);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.025),
    0 32px 64px -8px rgba(0,0,0,0.65),
    0 8px 20px rgba(0,0,0,0.4);
  animation: cardIn var(--t-slow) var(--ease) 0.08s both;
  position: relative;
  overflow: hidden;
}

/* Inner top shimmer line */
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 12%; right: 12%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  pointer-events: none;
}

/* ── Tabs ────────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 3px;
  margin-bottom: 1.5rem;
  background: rgba(0,0,0,0.3);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--r-md);
  padding: 4px;
}
.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--muted);
  padding: 0.42rem 0.75rem;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font);
  border-radius: calc(var(--r-md) - 3px);
  transition:
    color var(--t-fast) var(--ease),
    background var(--t-med) var(--ease),
    box-shadow var(--t-med) var(--ease);
  letter-spacing: 0.01em;
}
.tab-btn.active {
  color: var(--text);
  background: rgba(255,255,255,0.08);
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}
.tab-btn:not(.active):hover { color: var(--text); }

.tab-content { display: none; }
.tab-content.active {
  display: block;
  animation: fadeUp var(--t-med) var(--ease) both;
}

/* ── Fields ──────────────────────────────────────────────── */
.field { margin-bottom: 0.95rem; }
.field label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.38rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.field input,
.field textarea,
.field select {
  width: 100%;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.62rem 0.9rem;
  border-radius: var(--r-sm);
  font-size: 0.88rem;
  font-family: var(--font);
  outline: none;
  transition:
    border-color var(--t-fast) var(--ease),
    background   var(--t-fast) var(--ease),
    box-shadow   var(--t-fast) var(--ease);
  -webkit-appearance: none;
  appearance: none;
}
.field input:hover:not(:focus),
.field textarea:hover:not(:focus),
.field select:hover:not(:focus) {
  border-color: var(--border-hi);
}
.field input:focus,
.field textarea:focus,
.field select:focus {
  border-color: var(--accent);
  background: rgba(91,140,247,0.06);
  box-shadow: 0 0 0 3px rgba(91,140,247,0.13);
}
.field input::placeholder,
.field textarea::placeholder { color: var(--muted); opacity: 0.6; }
.field textarea {
  resize: vertical;
  min-height: 130px;
  line-height: 1.6;
}
.field select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='11' height='7' viewBox='0 0 11 7'%3E%3Cpath d='M1 1l4.5 4.5L10 1' stroke='%23636382' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
  padding-right: 2.25rem;
}
.field select option { background: #10101e; color: var(--text); }

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

/* ── Drop zone ───────────────────────────────────────────── */
.drop-zone {
  position: relative;
  border: 1.5px dashed rgba(255,255,255,0.14);
  border-radius: var(--r-md);
  padding: 2.75rem 1.25rem;
  text-align: center;
  cursor: pointer;
  color: var(--muted);
  margin-bottom: 0.95rem;
  background: rgba(255,255,255,0.015);
  transition:
    border-color  var(--t-med) var(--ease),
    background    var(--t-med) var(--ease),
    box-shadow    var(--t-med) var(--ease);
  overflow: hidden;
}
.drop-zone input[type=file] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}
.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--accent);
  border-style: solid;
  background: rgba(91,140,247,0.055);
  box-shadow: inset 0 0 0 1px rgba(91,140,247,0.1), 0 0 30px rgba(91,140,247,0.07);
}
.drop-zone.has-file {
  border-style: solid;
  border-color: var(--success);
  background: rgba(36,212,122,0.045);
  box-shadow: inset 0 0 0 1px rgba(36,212,122,0.1);
}
.dz-icon {
  display: block;
  font-size: 2.1rem;
  margin-bottom: 0.6rem;
  line-height: 1;
  transition: transform var(--t-med) var(--spring);
}
.drop-zone:hover .dz-icon,
.drop-zone.dragover .dz-icon { transform: scale(1.12) translateY(-3px); }
.dz-main  { font-size: 0.88rem; font-weight: 500; }
.dz-hint  { font-size: 0.75rem; margin-top: 0.3rem; opacity: 0.6; }
.dz-name  { font-weight: 600; word-break: break-all; font-size: 0.88rem; }
.dz-size  { font-size: 0.75rem; margin-top: 0.25rem; opacity: 0.65; }

/* ── Toggle switch ───────────────────────────────────────── */
.toggle-field {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.95rem;
}
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 38px;
  height: 21px;
  flex-shrink: 0;
}
.toggle-switch input {
  opacity: 0; width: 0; height: 0;
  position: absolute;
}
.toggle-track {
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.09);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 21px;
  cursor: pointer;
  transition:
    background var(--t-med) var(--ease),
    border-color var(--t-med) var(--ease),
    box-shadow var(--t-med) var(--ease);
}
.toggle-track::after {
  content: '';
  position: absolute;
  top: 2.5px; left: 2.5px;
  width: 14px; height: 14px;
  background: var(--muted);
  border-radius: 50%;
  transition:
    transform var(--t-med) var(--spring),
    background var(--t-fast) var(--ease);
}
.toggle-switch input:checked + .toggle-track {
  background: rgba(91,140,247,0.22);
  border-color: var(--accent);
  box-shadow: 0 0 10px rgba(91,140,247,0.2);
}
.toggle-switch input:checked + .toggle-track::after {
  transform: translateX(17px);
  background: var(--accent);
}
.toggle-label {
  font-size: 0.875rem;
  cursor: pointer;
  color: var(--text);
  user-select: none;
  font-weight: 400;
}

/* ── Divider ─────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 1.1rem 0;
}

/* ── Button ──────────────────────────────────────────────── */
.btn {
  position: relative;
  width: 100%;
  padding: 0.78rem 1.25rem;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  border: none;
  border-radius: var(--r-sm);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font);
  letter-spacing: 0.02em;
  cursor: pointer;
  overflow: hidden;
  transition:
    transform    var(--t-fast) var(--spring),
    box-shadow   var(--t-fast) var(--ease),
    opacity      var(--t-fast);
}
/* Shimmer sweep on hover */
.btn::after {
  content: '';
  position: absolute;
  top: 0; left: -120%;
  width: 55%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transform: skewX(-18deg);
  transition: left 0.55s var(--ease);
}
.btn:hover:not(:disabled)::after { left: 160%; }
.btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(91,140,247,0.38), 0 4px 12px rgba(0,0,0,0.35);
}
.btn:active:not(:disabled) {
  transform: translateY(0) scale(0.99);
  box-shadow: none;
}
.btn:disabled { opacity: 0.38; cursor: not-allowed; }

.btn-outline {
  background: transparent;
  border: 1px solid rgba(91,140,247,0.5);
  color: var(--accent);
}
.btn-outline::after { display: none; }
.btn-outline:hover:not(:disabled) {
  transform: translateY(-1px);
  background: rgba(91,140,247,0.08);
  box-shadow: 0 0 20px rgba(91,140,247,0.16);
  border-color: var(--accent);
}

/* ── Progress ────────────────────────────────────────────── */
.progress-wrap { margin-bottom: 0.95rem; }
.progress-bar {
  height: 3px;
  background: rgba(255,255,255,0.07);
  border-radius: 3px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 3px;
  transition: width 0.28s var(--ease);
  position: relative;
}
.progress-fill::after {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 60px; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.45), transparent);
  animation: shimmerBar 1.4s var(--ease) infinite;
}
.progress-label {
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.4rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* ── Result box ──────────────────────────────────────────── */
.result {
  background: rgba(36,212,122,0.04);
  border: 1px solid rgba(36,212,122,0.2);
  border-radius: var(--r-md);
  padding: 1.25rem 1.25rem 1rem;
  margin-top: 1rem;
  animation: fadeUp var(--t-med) var(--ease) both;
}
.result-heading {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--success);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}
.result-label {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.32rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.copy-field {
  display: flex;
  gap: 0.45rem;
  align-items: stretch;
  margin-bottom: 0.75rem;
}
.copy-field input {
  flex: 1;
  background: rgba(0,0,0,0.35);
  border: 1px solid rgba(255,255,255,0.07);
  color: var(--text);
  padding: 0.48rem 0.75rem;
  border-radius: var(--r-sm);
  font-size: 0.78rem;
  font-family: var(--mono);
  outline: none;
  min-width: 0;
  transition: border-color var(--t-fast) var(--ease);
}
.copy-field input:focus { border-color: var(--border-hi); }
.copy-btn {
  padding: 0.48rem 0.9rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text);
  border-radius: var(--r-sm);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font);
  white-space: nowrap;
  flex-shrink: 0;
  transition:
    background    var(--t-fast) var(--ease),
    border-color  var(--t-fast) var(--ease),
    transform     var(--t-fast) var(--spring);
  letter-spacing: 0.02em;
}
.copy-btn:hover {
  background: rgba(255,255,255,0.11);
  border-color: rgba(255,255,255,0.2);
  transform: translateY(-1px);
}
.copy-btn:active { transform: scale(0.97); }

/* ── Info grid (download page) ───────────────────────────── */
.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin-bottom: 1.4rem;
}
.info-item {
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 0.85rem 1rem;
  transition:
    background    var(--t-fast) var(--ease),
    border-color  var(--t-fast) var(--ease),
    transform     var(--t-fast) var(--spring);
}
.info-item:hover {
  background: rgba(255,255,255,0.045);
  border-color: var(--border-hi);
  transform: translateY(-1px);
}
.info-item .i-label {
  font-size: 0.66rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.info-item .i-value {
  font-size: 0.875rem;
  font-weight: 500;
  margin-top: 0.28rem;
  word-break: break-word;
}

/* ── Alerts ──────────────────────────────────────────────── */
.alert {
  border-radius: var(--r-sm);
  padding: 0.7rem 0.95rem;
  font-size: 0.83rem;
  line-height: 1.5;
  margin-bottom: 0.95rem;
  border: 1px solid;
  font-weight: 400;
}
.alert-warning { background: rgba(245,166,35,0.07);  border-color: rgba(245,166,35,0.28); color: var(--warning); }
.alert-error   { background: rgba(240,88,88,0.07);   border-color: rgba(240,88,88,0.28);  color: var(--error); }
.alert-info    { background: rgba(91,140,247,0.06);  border-color: rgba(91,140,247,0.25); color: var(--accent); }

/* ── Text output ─────────────────────────────────────────── */
.text-output {
  background: rgba(0,0,0,0.42);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 1rem 1.1rem;
  font-family: var(--mono);
  font-size: 0.84rem;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 360px;
  overflow-y: auto;
  margin-bottom: 1rem;
  color: var(--text);
  line-height: 1.68;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.1) transparent;
}
.text-output::-webkit-scrollbar { width: 4px; }
.text-output::-webkit-scrollbar-track { background: transparent; }
.text-output::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.12);
  border-radius: 4px;
}

/* ── Footer ──────────────────────────────────────────────── */
footer {
  margin-top: 2.5rem;
  color: var(--muted);
  font-size: 0.72rem;
  text-align: center;
  opacity: 0.65;
  animation: fadeUp var(--t-slow) var(--ease) 0.25s both;
  letter-spacing: 0.03em;
}
footer .sep { margin: 0 0.45rem; opacity: 0.35; }

/* ── Keyframes ───────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0);    }
}
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0);     }
}
@keyframes cardIn {
  from { opacity: 0; transform: translateY(18px) scale(0.985); }
  to   { opacity: 1; transform: translateY(0)    scale(1);     }
}
@keyframes shimmerBar {
  0%   { opacity: 0; transform: translateX(-40px); }
  40%  { opacity: 1; }
  100% { opacity: 0; transform: translateX(50px);  }
}
@keyframes floatMark {
  0%,100% { transform: translateY(0px);  }
  50%      { transform: translateY(-5px); }
}

/* ── View crossfade ──────────────────────────────────────── */
@keyframes viewExit {
  to { opacity: 0; transform: translateY(-10px); }
}
@keyframes viewEnter {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0);    }
}
.view-exiting { animation: viewExit  0.26s var(--ease) forwards; }
.view-entering { animation: viewEnter 0.32s var(--ease) both; }

/* ── Result view (standalone success screen) ─────────────── */
#resultView {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.success-icon {
  display: flex;
  justify-content: center;
  margin-bottom: 1.35rem;
}
.success-icon svg { width: 56px; height: 56px; overflow: visible; }

.check-circle {
  fill: none;
  stroke: var(--success);
  stroke-width: 1.8;
  stroke-dasharray: 157;
  stroke-dashoffset: 157;
  animation: drawCircle 0.5s var(--ease) 0.05s forwards;
}
.check-mark {
  fill: none;
  stroke: var(--success);
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 38;
  stroke-dashoffset: 38;
  animation: drawCheck 0.28s var(--ease) 0.52s forwards;
}
@keyframes drawCircle { to { stroke-dashoffset: 0; } }
@keyframes drawCheck  { to { stroke-dashoffset: 0; } }

.result-title {
  text-align: center;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.3rem;
}
.result-subtitle {
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.share-again-btn {
  width: 100%;
  margin-top: 0.75rem;
  padding: 0.65rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  color: var(--muted);
  font-size: 0.82rem;
  font-family: var(--font);
  font-weight: 500;
  cursor: pointer;
  transition:
    border-color var(--t-fast) var(--ease),
    color        var(--t-fast) var(--ease),
    background   var(--t-fast) var(--ease);
  letter-spacing: 0.01em;
}
.share-again-btn:hover {
  border-color: var(--border-hi);
  color: var(--text);
  background: rgba(255,255,255,0.04);
}

/* ── Utilities ───────────────────────────────────────────── */
.hidden { display: none !important; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }