:root {
  --nu-green-dark: #005214;
  --nu-green: #006b1d;
  --nu-green-light: #00a300;
  --nu-cream: #f0f7e6;
  --nu-white: #ffffff;
  --shadow-sm: 0 1px 3px rgba(0, 60, 12, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 60, 12, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 60, 12, 0.1);
  --shadow-glow: 0 0 20px rgba(0, 128, 0, 0.12);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Segoe UI', sans-serif;
  background: var(--nu-cream);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ======================== Glass Utilities ======================== */
.glass {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.glass-card {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: 0 8px 32px rgba(0, 60, 12, 0.06);
}

.glass-strong {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.7);
}

/* ======================== Canvas ======================== */
#canvas-container {
  width: 100%;
  max-width: 500px;
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  position: relative;
  background: repeating-conic-gradient(#e8e8e8 0% 25%, transparent 0% 50%) 50% / 20px 20px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 60, 12, 0.12), inset 0 0 0 1px rgba(255,255,255,0.5);
  border: 2px solid rgba(0, 107, 29, 0.25);
}

#canvas-container canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

@keyframes pulse-border {
  0%, 100% { border-color: rgba(0, 107, 29, 0.3); }
  50% { border-color: rgba(0, 163, 0, 0.5); }
}

#canvas-container.has-frame {
  animation: pulse-border 3s ease-in-out infinite;
}

/* ======================== Frame Cards ======================== */
.frame-card {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 16px;
  overflow: hidden;
}

.frame-card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 16px 40px rgba(0, 60, 12, 0.1);
  border-color: rgba(0, 107, 29, 0.15);
}

.frame-card.active {
  border-color: var(--nu-green);
  box-shadow: 0 0 0 4px rgba(0, 128, 0, 0.15), 0 12px 32px rgba(0, 60, 12, 0.1);
}

.frame-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* ======================== Buttons ======================== */
.btn-control {
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-control:hover {
  transform: translateY(-1px) scale(1.03);
}

.btn-control:active {
  transform: translateY(0) scale(0.97);
}

.btn-primary {
  background: linear-gradient(135deg, var(--nu-green-dark), var(--nu-green));
  color: white;
  border: none;
  padding: 12px 28px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 16px rgba(0, 60, 12, 0.2);
}

.btn-primary:hover {
  box-shadow: 0 8px 24px rgba(0, 60, 12, 0.28), 0 0 0 1px rgba(0, 107, 29, 0.1);
  filter: brightness(1.08);
  transform: translateY(-1px);
}

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

/* ======================== Category ======================== */
.category-btn {
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.category-btn.active {
  background-color: var(--nu-green);
  color: white;
}

/* ======================== Upload ======================== */
#upload-input {
  display: none;
}

.preview-thumb {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: 10px;
  border: 2px solid rgba(0, 107, 29, 0.3);
}

/* ======================== Animations ======================== */
.fade-in {
  animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

/* ======================== Form Inputs ======================== */
input:focus,
select:focus,
textarea:focus {
  outline: none;
}

/* ======================== Scrollbar ======================== */
::-webkit-scrollbar {
  width: 5px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(0, 100, 0, 0.15);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 100, 0, 0.25);
}

/* ======================== Selection ======================== */
::selection {
  background: rgba(0, 128, 0, 0.15);
  color: #003300;
}

/* ======================== Mobile ======================== */
@media (max-width: 640px) {
  body {
    overflow-x: hidden;
  }

  nav > div {
    min-height: 56px;
    padding-left: max(12px, env(safe-area-inset-left));
    padding-right: max(12px, env(safe-area-inset-right));
  }

  nav .logo-box {
    width: 38px;
    height: 38px;
    border-radius: 11px;
  }

  body > header {
    padding: 38px 16px 34px;
  }

  body > header h1 {
    font-size: 2.45rem;
    line-height: 1.08;
  }

  body > header p {
    font-size: 0.9375rem;
    line-height: 1.55;
    margin-bottom: 24px;
  }

  body > header a {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  #gallery {
    padding-left: 16px;
    padding-right: 16px;
    padding-bottom: 64px;
  }

  #gallery > div:first-child {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 20px;
  }

  #gallery > div:first-child h2 {
    font-size: 1.45rem;
  }

  #category-buttons {
    width: calc(100% + 16px);
    flex-wrap: nowrap !important;
    overflow-x: auto;
    padding: 2px 16px 6px 0;
    scrollbar-width: none;
  }

  #category-buttons::-webkit-scrollbar {
    display: none;
  }

  .category-btn {
    flex: 0 0 auto;
    min-height: 36px;
  }

  #featured-grid {
    gap: 12px;
  }

  .frame-card {
    border-width: 1px;
    border-radius: 14px;
  }

  .frame-card > div:last-child {
    padding: 11px 12px 12px;
  }

  body > section:not(#gallery) {
    padding-top: 52px;
    padding-bottom: 52px;
  }

  body > section:not(#gallery) .glass-card {
    padding: 22px 18px;
  }

  #editor-area {
    padding: 20px 12px 44px;
  }

  #editor-area > .glass-card {
    padding: 14px;
    border-radius: 18px;
  }

  #canvas-container {
    border-radius: 12px;
  }

  #editor-area .btn-primary,
  #editor-area #btn-download,
  #editor-area #btn-share-link,
  #editor-area #btn-share-whatsapp {
    min-height: 46px;
  }

  #editor-area .mt-5.flex,
  #editor-area .mt-4.flex {
    gap: 8px;
  }

  #editor-area .mt-5.flex label {
    flex: 1 1 auto;
    justify-content: center;
  }

  #editor-area .mt-4.flex button {
    min-width: 44px;
    min-height: 44px;
    padding-left: 12px;
    padding-right: 12px;
  }

  #editor-area .mt-4.flex:last-of-type {
    flex-direction: column;
    align-items: stretch;
  }

  #editor-area .mt-4.flex:last-of-type button {
    width: 100%;
  }

  body > footer {
    padding-top: 42px;
  }

  body > footer .max-w-6xl {
    padding-left: 20px;
    padding-right: 20px;
  }

  #canvas-container {
    max-width: 100%;
    border-radius: 12px;
  }

  .frame-card:hover {
    transform: none;
  }
}

/* ======================== Safe Area (Notch phones) ======================== */
@supports (padding: env(safe-area-inset-bottom)) {
  body {
    padding-bottom: env(safe-area-inset-bottom);
  }

  nav {
    padding-left: max(12px, env(safe-area-inset-left));
    padding-right: max(12px, env(safe-area-inset-right));
  }
}

/* ======================== Touch-friendly ======================== */
@media (hover: none) and (pointer: coarse) {
  .btn-control:hover {
    transform: none;
  }

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

  .frame-card:hover {
    transform: none;
    box-shadow: none;
  }

  .frame-card:active {
    transform: scale(0.98);
  }
}

@media (max-width: 380px) {
  body > header h1 {
    font-size: 2.15rem;
  }

  #featured-grid {
    gap: 8px;
  }

  .frame-card > div:last-child {
    padding-left: 9px;
    padding-right: 9px;
  }

  .frame-card h3 {
    font-size: 0.75rem;
  }
}