/* ============================================
   InstaSaver - Premium CSS Design System
   Mobile-first • Dark Mode • Glassmorphism
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Color System - Deep violet/indigo palette */
  --color-bg: #0a0a12;
  --color-bg-elevated: #12121e;
  --color-bg-card: rgba(18, 18, 32, 0.7);
  --color-bg-glass: rgba(255, 255, 255, 0.04);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.15);

  --color-text-primary: #f0f0f5;
  --color-text-secondary: #8888a0;
  --color-text-muted: #5a5a72;

  /* Accent - Vivid gradient */
  --color-accent-start: #7c3aed;
  --color-accent-mid: #a855f7;
  --color-accent-end: #ec4899;
  --gradient-accent: linear-gradient(135deg, var(--color-accent-start), var(--color-accent-mid), var(--color-accent-end));
}

/* ---------- Light Theme Tokens ---------- */
[data-theme="light"] {
  --color-bg: #f8faff;
  --color-bg-elevated: #ffffff;
  --color-bg-card: rgba(255, 255, 255, 0.9);
  --color-bg-glass: rgba(255, 255, 255, 0.75);
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;

  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 35px rgba(124, 58, 237, 0.12);
}

/* Theme Toggle Button Component */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
  padding: 0;
}
.theme-toggle-btn:hover {
  background: var(--color-border-hover);
  border-color: var(--color-accent-mid);
  transform: translateY(-1px);
}
.theme-toggle-btn:active {
  transform: translateY(0);
}
.theme-icon-sun, .theme-icon-moon {
  transition: transform 0.3s ease;
}
.theme-toggle-btn:hover .theme-icon-sun {
  transform: rotate(30deg);
}
.theme-toggle-btn:hover .theme-icon-moon {
  transform: rotate(-15deg);
}

  /* Success / Error */
  --color-success: #22c55e;
  --color-success-bg: rgba(34, 197, 94, 0.1);
  --color-error: #ef4444;
  --color-error-bg: rgba(239, 68, 68, 0.08);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(124, 58, 237, 0.15);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- Ambient Background ---------- */
.ambient-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.3;
  will-change: transform;
}

.blob-1 {
  width: 500px;
  height: 500px;
  background: var(--color-accent-start);
  top: -15%;
  left: -10%;
  animation: blobFloat1 20s ease-in-out infinite;
}

.blob-2 {
  width: 400px;
  height: 400px;
  background: var(--color-accent-end);
  top: 50%;
  right: -15%;
  animation: blobFloat2 25s ease-in-out infinite;
}

.blob-3 {
  width: 350px;
  height: 350px;
  background: var(--color-accent-mid);
  bottom: -10%;
  left: 30%;
  animation: blobFloat3 22s ease-in-out infinite;
}

@keyframes blobFloat1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(60px, 40px) scale(1.1); }
  66% { transform: translate(-30px, 80px) scale(0.95); }
}

@keyframes blobFloat2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-50px, -30px) scale(1.05); }
  66% { transform: translate(40px, -60px) scale(0.9); }
}

@keyframes blobFloat3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -50px) scale(1.08); }
  66% { transform: translate(-60px, 30px) scale(0.92); }
}

/* ---------- Container ---------- */
.container {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- Header ---------- */
.header {
  display: flex;
  justify-content: center;
  padding: var(--space-md) 0 var(--space-lg);
}

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

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--gradient-accent);
  color: white;
  box-shadow: var(--shadow-glow);
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Hero ---------- */
.hero {
  text-align: center;
  padding: var(--space-xl) 0 var(--space-2xl);
}

.hero-title {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

.hero-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---------- Download Form ---------- */
.download-section {
  margin-bottom: var(--space-2xl);
}

.download-form {
  width: 100%;
}

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

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: var(--space-md);
  color: var(--color-text-muted);
  pointer-events: none;
  flex-shrink: 0;
}

.url-input {
  width: 100%;
  padding: var(--space-md) var(--space-md);
  padding-left: 3rem;
  padding-right: 3.5rem;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background: var(--color-bg-glass);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  outline: none;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  min-height: 56px;
}

.url-input::placeholder {
  color: var(--color-text-muted);
}

.url-input:focus {
  border-color: var(--color-accent-start);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
  background: rgba(255, 255, 255, 0.06);
}

.paste-btn {
  position: absolute;
  right: var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.paste-btn:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-glass);
}

.paste-btn:active {
  transform: scale(0.95);
}

/* Download Button */
.download-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  min-height: 56px;
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-family);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: white;
  background: var(--gradient-accent);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-base), opacity var(--transition-fast);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.download-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.download-btn:hover::before {
  opacity: 1;
}

.download-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg), 0 0 60px rgba(124, 58, 237, 0.25);
}

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

.download-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.download-btn:disabled::before {
  display: none;
}

/* ---------- Error Message ---------- */
.error-message {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  margin-top: var(--space-md);
  background: var(--color-error-bg);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-md);
  color: #fca5a5;
  font-size: var(--font-size-sm);
  animation: slideDown 0.3s ease;
}

.error-message[hidden] {
  display: none;
}

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

/* ---------- Processing Section ---------- */
.processing-section {
  margin-bottom: var(--space-2xl);
  animation: fadeIn 0.4s ease;
}

.processing-section[hidden] {
  display: none;
}

.processing-card {
  padding: var(--space-2xl) var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  text-align: center;
  box-shadow: var(--shadow-md);
}

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

/* Progress Ring */
.progress-ring-container {
  position: relative;
  width: 100px;
  height: 100px;
  margin: 0 auto var(--space-lg);
}

.progress-ring {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.progress-ring-bg {
  fill: none;
  stroke: var(--color-border);
  stroke-width: 5;
}

.progress-ring-fill {
  fill: none;
  stroke: url(#gradient);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-dasharray: 264;
  stroke-dashoffset: 264;
  transition: stroke-dashoffset 0.6s ease;
}

/* We'll use CSS gradient since SVG gradient isn't defined in the ring */
.progress-ring-fill {
  stroke: var(--color-accent-mid);
}

.progress-percent {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-primary);
}

/* Spinner */
.spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent-mid);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.processing-status {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-xl);
  color: var(--color-text-primary);
}

/* Processing Steps */
.processing-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  text-align: left;
  max-width: 280px;
  margin: 0 auto;
}

.step {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.step[data-status="active"] {
  color: var(--color-accent-mid);
}

.step[data-status="done"] {
  color: var(--color-success);
}

.step-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-text-muted);
  flex-shrink: 0;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.step[data-status="active"] .step-indicator {
  background: var(--color-accent-mid);
  box-shadow: 0 0 8px rgba(168, 85, 247, 0.5);
  animation: pulse 1.5s ease-in-out infinite;
}

.step[data-status="done"] .step-indicator {
  background: var(--color-success);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ---------- Result Section ---------- */
.result-section {
  margin-bottom: var(--space-2xl);
  animation: fadeIn 0.4s ease;
}

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

.result-card {
  padding: var(--space-xl) var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-md);
}

.result-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.result-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-success-bg);
  border: 1px solid rgba(34, 197, 94, 0.2);
  border-radius: var(--radius-full);
  color: var(--color-success);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

/* Info Grid */
.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-md);
  background: var(--color-bg-glass);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.info-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.info-value {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text-primary);
}

.metadata-clean {
  color: var(--color-success);
}

/* Save Button */
.save-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  min-height: 56px;
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-family);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: white;
  background: var(--gradient-accent);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-base);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.save-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.save-btn:hover::before {
  opacity: 1;
}

.save-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg), 0 0 60px rgba(124, 58, 237, 0.25);
}

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

/* New Download Button */
.new-download-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  min-height: 48px;
  margin-top: var(--space-md);
  padding: var(--space-md);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.new-download-btn:hover {
  color: var(--color-text-primary);
  border-color: var(--color-border-hover);
  background: var(--color-bg-glass);
}

/* ---------- Features ---------- */
.features {
  margin-top: auto;
  padding: var(--space-2xl) 0;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.feature-card {
  padding: var(--space-lg);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.feature-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--gradient-accent);
  color: white;
  margin-bottom: var(--space-md);
  box-shadow: 0 0 20px rgba(124, 58, 237, 0.15);
}

.feature-card h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: var(--space-xl) 0 var(--space-lg);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-xl);
}

.footer p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.footer-note {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  opacity: 0.7;
}

/* ---------- Responsive Breakpoints ---------- */

/* Tablets and small desktops */
@media (min-width: 480px) {
  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .info-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .container {
    padding: var(--space-xl) var(--space-lg);
  }
}

/* Desktop */
@media (min-width: 768px) {
  .container {
    max-width: 680px;
    padding: var(--space-2xl);
  }

  .input-group {
    flex-direction: row;
  }

  .input-wrapper {
    flex: 1;
  }

  .download-btn {
    width: auto;
    min-width: 160px;
    border-radius: var(--radius-lg);
  }

  .url-input {
    border-radius: var(--radius-lg);
  }
}

/* Large desktop */
@media (min-width: 1024px) {
  .container {
    max-width: 720px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .blob {
    animation: none;
  }
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-accent-mid);
  outline-offset: 2px;
}

/* Selection */
::selection {
  background: rgba(124, 58, 237, 0.3);
  color: white;
}