:root {
  --zsk-primary: #1a3658;
  --zsk-primary-light: #2c5282;
  --zsk-accent: #2b6cb0;
  --zsk-bg: #f7fafc;
  --zsk-card: #fff;
  --zsk-text: #2d3748;
  --zsk-text-muted: #718096;
  --zsk-border: #e2e8f0;
  --zsk-error: #c53030;
  --zsk-success: #276749;
  --sidebar-width: 220px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  color: var(--zsk-text);
  background: var(--zsk-bg);
}

/* Login */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--zsk-primary) 0%, var(--zsk-primary-light) 100%);
}

.login-box {
  background: var(--zsk-card);
  padding: 2rem 2.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  width: 100%;
  max-width: 360px;
}

.login-box h1 {
  margin: 0 0 0.25rem 0;
  font-size: 1.75rem;
  color: var(--zsk-primary);
}

.login-sub {
  margin: 0 0 1.5rem 0;
  color: var(--zsk-text-muted);
  font-size: 0.9rem;
}

.login-form label {
  display: block;
  margin-bottom: 1rem;
}

.login-form label span {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.85rem;
  color: var(--zsk-text-muted);
}

.login-form input {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--zsk-border);
  border-radius: 6px;
  font-size: 1rem;
}

.login-form button {
  width: 100%;
  margin-top: 0.5rem;
  padding: 0.7rem;
  background: var(--zsk-primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
}

.login-form button:hover {
  background: var(--zsk-primary-light);
}

.error {
  color: var(--zsk-error);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

/* App layout */
.app-header {
  background: var(--zsk-primary);
  color: #fff;
  padding: 0 1.5rem;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-header a {
  color: #fff;
  text-decoration: none;
  font-weight: 600;
}

.app-header .user {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.app-header .user form {
  margin: 0;
}

.app-header .user button {
  background: transparent;
  border: none;
  color: rgba(255,255,255,0.9);
  cursor: pointer;
  font-size: 0.9rem;
}

.app-layout {
  display: flex;
  min-height: calc(100vh - 56px);
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--zsk-card);
  border-right: 1px solid var(--zsk-border);
  padding: 1rem 0;
}

.sidebar nav a {
  display: block;
  padding: 0.6rem 1.25rem;
  color: var(--zsk-text);
  text-decoration: none;
  font-size: 0.95rem;
}

.sidebar nav a:hover {
  background: var(--zsk-bg);
}

.sidebar nav a.active {
  background: var(--zsk-bg);
  color: var(--zsk-accent);
  font-weight: 500;
  border-left: 3px solid var(--zsk-accent);
  padding-left: calc(1.25rem - 3px);
}

.sidebar .btn-create {
  margin: 0.75rem 1rem;
  display: block;
  text-align: center;
  padding: 0.6rem 1rem;
  background: var(--zsk-accent);
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 500;
}

.sidebar .btn-create:hover {
  background: var(--zsk-primary-light);
  color: #fff;
}

.main {
  flex: 1;
  padding: 1.5rem;
  overflow: auto;
}

.page-title {
  margin: 0 0 1.25rem 0;
  font-size: 1.35rem;
  color: var(--zsk-text);
}

/* Dashboard cards */
.qr-list {
  display: grid;
  gap: 1rem;
}

.qr-card {
  background: var(--zsk-card);
  border: 1px solid var(--zsk-border);
  border-radius: 8px;
  padding: 1.25rem;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.qr-card-preview {
  flex-shrink: 0;
  width: 120px;
  height: 120px;
  background: #fff;
  border: 1px solid var(--zsk-border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.qr-card-preview img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.qr-card-body {
  flex: 1;
  min-width: 0;
}

.qr-card-body h3 {
  margin: 0 0 0.35rem 0;
  font-size: 1rem;
  font-weight: 600;
}

.qr-card-body .short-url {
  font-family: monospace;
  font-size: 0.85rem;
  color: var(--zsk-accent);
  margin-bottom: 0.25rem;
}

.qr-card-body .target-url {
  font-size: 0.85rem;
  color: var(--zsk-text-muted);
  word-break: break-all;
  margin-bottom: 0.5rem;
}

.qr-card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.qr-card-actions a,
.qr-card-actions button {
  font-size: 0.85rem;
  padding: 0.35rem 0.6rem;
  border-radius: 4px;
  text-decoration: none;
  border: 1px solid var(--zsk-border);
  background: var(--zsk-card);
  color: var(--zsk-text);
  cursor: pointer;
}

.qr-card-actions a:hover,
.qr-card-actions button:hover {
  background: var(--zsk-bg);
}

.qr-card-actions .btn-download {
  background: var(--zsk-accent);
  color: #fff;
  border-color: var(--zsk-accent);
}

.qr-card-actions .btn-download:hover {
  background: var(--zsk-primary-light);
  color: #fff;
}

.stats-count {
  font-size: 1rem;
  color: var(--zsk-accent);
  margin: 0.25rem 0;
}

/* Create / Wizard */
.wizard-steps {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

.wizard-steps span {
  padding: 0.4rem 0.75rem;
  background: var(--zsk-border);
  border-radius: 6px;
  color: var(--zsk-text-muted);
}

.wizard-steps span.active {
  background: var(--zsk-accent);
  color: #fff;
}

.wizard-steps span.done {
  background: var(--zsk-bg);
  color: var(--zsk-text);
}

.wizard-panel {
  background: var(--zsk-card);
  border: 1px solid var(--zsk-border);
  border-radius: 8px;
  padding: 1.5rem;
  max-width: 560px;
}

.wizard-panel label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  font-size: 0.9rem;
}

.wizard-panel input[type="text"],
.wizard-panel input[type="url"] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--zsk-border);
  border-radius: 6px;
  font-size: 1rem;
  margin-bottom: 1rem;
}

.wizard-actions {
  margin-top: 1.5rem;
  display: flex;
  gap: 0.75rem;
}

.wizard-actions button,
.wizard-actions a {
  padding: 0.6rem 1.25rem;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
  border: 1px solid var(--zsk-border);
  background: var(--zsk-card);
  color: var(--zsk-text);
}

.wizard-actions .btn-primary {
  background: var(--zsk-accent);
  color: #fff;
  border-color: var(--zsk-accent);
}

.wizard-actions .btn-primary:hover {
  background: var(--zsk-primary-light);
  color: #fff;
}

/* Design editor */
.design-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1.5rem;
  min-height: 0;
}

.design-options {
  background: var(--zsk-card);
  border: 1px solid var(--zsk-border);
  border-radius: 8px;
  padding: 1rem;
  overflow-y: auto;
}

.design-options h4 {
  margin: 0 0 0.75rem 0;
  font-size: 0.95rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--zsk-border);
}

.design-options .option-group {
  margin-bottom: 1rem;
}

.design-options label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
  color: var(--zsk-text-muted);
}

.design-options input[type="color"] {
  width: 100%;
  height: 36px;
  padding: 2px;
  border: 1px solid var(--zsk-border);
  border-radius: 4px;
  cursor: pointer;
}

.design-options input[type="text"].color-hex {
  width: 100%;
  padding: 0.4rem;
  font-family: monospace;
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

.design-preview {
  background: var(--zsk-card);
  border: 1px solid var(--zsk-border);
  border-radius: 8px;
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
}

.design-preview canvas,
.design-preview img {
  max-width: 100%;
  height: auto;
}

/* Edit content form */
.edit-form label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.edit-form input {
  width: 100%;
  max-width: 480px;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--zsk-border);
  border-radius: 6px;
  margin-bottom: 1rem;
}

.form-actions {
  margin-top: 1rem;
}

.form-actions button,
.form-actions a {
  padding: 0.5rem 1rem;
  margin-right: 0.5rem;
  border-radius: 6px;
  text-decoration: none;
  border: 1px solid var(--zsk-border);
  background: var(--zsk-card);
  color: var(--zsk-text);
  cursor: pointer;
  font-size: 0.95rem;
}

.form-actions .btn-primary {
  background: var(--zsk-accent);
  color: #fff;
  border-color: var(--zsk-accent);
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1rem;
}

.tabs a {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  text-decoration: none;
  color: var(--zsk-text-muted);
  font-size: 0.9rem;
}

.tabs a.active {
  background: var(--zsk-bg);
  color: var(--zsk-accent);
  font-weight: 500;
}

/* Saved designs (optional) */
.saved-designs-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.saved-designs-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--zsk-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.saved-designs-list button {
  font-size: 0.85rem;
  padding: 0.25rem 0.5rem;
  background: var(--zsk-bg);
  border: 1px solid var(--zsk-border);
  border-radius: 4px;
  cursor: pointer;
}

/* Logo upload */
.logo-upload {
  border: 2px dashed var(--zsk-border);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  margin-bottom: 0.75rem;
}

.logo-upload input[type="file"] {
  font-size: 0.85rem;
}

.logo-preview {
  margin-top: 0.5rem;
  max-width: 80px;
  max-height: 80px;
}

.logo-preview img {
  max-width: 100%;
  max-height: 80px;
  object-fit: contain;
}

/* Toggle */
.toggle-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0.5rem 0;
}

.toggle-wrap input[type="checkbox"] {
  width: 40px;
  height: 22px;
  accent-color: var(--zsk-accent);
}