/* ----------------------------------------------------------------------
   DESIGN SYSTEM & CSS VARIABLES
   ---------------------------------------------------------------------- */
:root {
    --bg-app: radial-gradient(120% 120% at 50% 10%, #13121F 0%, #07060A 100%);
    --bg-glass: rgba(18, 16, 28, 0.65);
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-glass-focus: rgba(139, 92, 246, 0.4);
    
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    --accent-purple: #8B5CF6;
    --accent-purple-glow: rgba(139, 92, 246, 0.25);
    --accent-cyan: #06B6D4;
    --accent-rose: #F43F5E;
    --accent-mint: #10B981;
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --transition-fast: 0.15s ease;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
    background: var(--bg-app);
    color: var(--text-primary);
    font-family: var(--font-body);
    min-height: 100vh;
    line-height: 1.5;
    overflow-x: hidden;
    padding-bottom: 60px;
}

a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover {
    color: var(--text-primary);
}

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* ----------------------------------------------------------------------
   SCROLLBARS
   ---------------------------------------------------------------------- */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.02);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ----------------------------------------------------------------------
   LAYOUT CONTAINERS
   ---------------------------------------------------------------------- */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

header {
    padding: 40px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-glass);
    margin-bottom: 40px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}
.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 16px var(--accent-purple-glow);
}
.logo-icon svg {
    width: 22px;
    height: 22px;
    fill: #FFF;
}
.logo h1 {
    font-size: 20px;
    background: linear-gradient(120deg, #FFFFFF, var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.badge {
    background: rgba(139, 92, 246, 0.15);
    border: 1px solid rgba(139, 92, 246, 0.3);
    color: #C084FC;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* ----------------------------------------------------------------------
   GRID SYSTEM (Split Configuration & Preview)
   ---------------------------------------------------------------------- */
.app-grid {
    display: grid;
    grid-template-columns: 460px 1fr;
    gap: 32px;
    align-items: start;
}

@media (max-width: 1024px) {
    .app-grid {
        grid-template-columns: 1fr;
    }
}

/* ----------------------------------------------------------------------
   GLASSMORTPHIC CARDS
   ---------------------------------------------------------------------- */
.card {
    background: var(--bg-glass);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: transform var(--transition-smooth), border-color var(--transition-fast);
}

.card:hover {
    border-color: rgba(255, 255, 255, 0.15);
}

.card-title {
    font-size: 18px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ----------------------------------------------------------------------
   FORMS & INPUT CONTROLS
   ---------------------------------------------------------------------- */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input-container {
    position: relative;
    display: flex;
    width: 100%;
}

input[type="text"], input[type="password"], select {
    width: 100%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 14px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
    outline: none;
    appearance: none;
}

select {
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394A3B8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 16px;
    padding-right: 40px;
}

input[type="text"]:focus, input[type="password"]:focus, select:focus {
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 4px var(--accent-purple-glow);
    background: rgba(255, 255, 255, 0.05);
}

.input-helper {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 6px;
}

/* Toggle tabs */
.tabs {
    display: flex;
    background: rgba(0, 0, 0, 0.25);
    padding: 4px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    border: 1px solid var(--border-glass);
}
.charts-list-panel {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: 0 4px 16px var(--shadow);
    border: 1px solid var(--border-glass);
    margin-bottom: 80px;
}
.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 10px;
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.tab-btn.active {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

/* ----------------------------------------------------------------------
   COLOR CHIPS & PRESET OPTION BUTTONS
   ---------------------------------------------------------------------- */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}
.preset-btn {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 12px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}
.preset-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}
.preset-btn.active {
    border-color: var(--accent-purple);
    background: rgba(139, 92, 246, 0.08);
    box-shadow: 0 0 0 3px var(--accent-purple-glow);
}
.preset-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 14px;
}
.preset-btn.active .preset-icon {
    background: var(--accent-purple);
    color: #FFF;
}
.preset-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
}
.preset-btn.active .preset-label {
    color: var(--text-primary);
}

/* Colors Theme Selection */
.theme-select-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}
.theme-dot {
    height: 48px;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}
.theme-dot:hover {
    transform: scale(1.05);
}
.theme-dot.active {
    border-color: #FFF;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}
.theme-dot::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
}
.theme-dot.vibrant::before { background: linear-gradient(135deg, #8B5CF6, #3B82F6); }
.theme-dot.neon::before { background: linear-gradient(135deg, #F43F5E, #EC4899); }
.theme-dot.dark::before { background: linear-gradient(135deg, #4B5563, #1F2937); }
.theme-dot.mint::before { background: linear-gradient(135deg, #10B981, #059669); }
.theme-dot.pastel::before { background: linear-gradient(135deg, #C084FC, #818CF8); }

.theme-name {
    font-size: 10px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #FFF;
    z-index: 1;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

/* ----------------------------------------------------------------------
   TOGGLE SWITCHES
   ---------------------------------------------------------------------- */
.toggle-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}
.toggle-info label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}
.toggle-info span {
    font-size: 11px;
    color: var(--text-muted);
}
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}
.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(255, 255, 255, 0.08);
    transition: .4s;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-glass);
}
.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-secondary);
    transition: .4s;
    border-radius: 50%;
}
input:checked + .slider {
    background-color: var(--accent-purple);
    border-color: transparent;
}
input:checked + .slider:before {
    transform: translateX(20px);
    background-color: #FFF;
}

/* ----------------------------------------------------------------------
   PREVIEW COLUMN & EMBED MODULES
   ---------------------------------------------------------------------- */
.preview-sticky {
    position: sticky;
    top: 40px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.preview-box {
    width: 100%;
    min-height: 380px;
    background: rgba(0,0,0,0.2);
    border: 1px dashed rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 12px;
}
.preview-box iframe {
    width: 100%;
    height: 360px;
    border: none;
    background: transparent;
    border-radius: 8px;
}

.preview-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    color: var(--text-muted);
}
.preview-placeholder svg {
    width: 48px;
    height: 48px;
    stroke-width: 1.5;
}

/* ----------------------------------------------------------------------
   ACTIONS & EMBED BOXES
   ---------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    border: none;
    color: #FFF;
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 700;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}
.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.5);
    opacity: 0.95;
}
.btn:active {
    transform: translateY(0);
}
.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    box-shadow: none;
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: none;
}

.embed-result-card {
    display: flex;
    flex-direction: column;
    gap: 16px;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity var(--transition-smooth), transform var(--transition-smooth);
}
.embed-result-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.copy-input-group {
    display: flex;
    gap: 10px;
}
.copy-input-group input {
    flex: 1;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-glass);
    padding: 12px;
    border-radius: var(--radius-md);
    color: var(--accent-cyan);
    font-family: monospace;
    font-size: 12px;
    outline: none;
}

/* ----------------------------------------------------------------------
   LOADING INDICATORS
   ---------------------------------------------------------------------- */
.loader {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(255,255,255,0.05);
    border-top: 3px solid var(--accent-purple);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    position: absolute;
    z-index: 10;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.blur-overlay {
    filter: blur(4px);
    pointer-events: none;
    opacity: 0.6;
    transition: all var(--transition-fast);
}

/* Grid Layout for details listing */
.charts-list-panel {
    margin-top: 60px;
}
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}
.saved-chart-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 140px;
}
.saved-chart-header h4 {
    font-size: 15px;
    margin-bottom: 4px;
}
.saved-chart-header p {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}
.saved-chart-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.saved-chart-badge {
    font-size: 10px;
    padding: 2px 8px;
    background: rgba(255,255,255,0.06);
    border-radius: 4px;
    color: var(--text-secondary);
}
.saved-chart-links {
    display: flex;
    gap: 12px;
}
.saved-chart-links button {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: bold;
    cursor: pointer;
    transition: color var(--transition-fast);
}
.saved-chart-links button:hover {
    color: var(--accent-rose);
}
.saved-chart-links a {
    font-size: 11px;
    font-weight: bold;
}

/* ----------------------------------------------------------------------
   LANDING PAGE SECTIONS (How It Works, Pricing, FAQ)
   ---------------------------------------------------------------------- */
.landing-section {
    padding: 80px 0;
    border-top: 1px solid var(--border-glass);
}
.section-header {
    text-align: center;
    margin-bottom: 50px;
}
.section-title {
    font-size: 36px;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #FFF, var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.section-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* How It Works */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 900px;
    margin: 0 auto;
}
.step-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    position: relative;
}
.step-number {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 20px;
    color: #FFF;
    box-shadow: 0 4px 12px var(--accent-purple-glow);
}
.step-title {
    font-size: 18px;
    margin-top: 10px;
    margin-bottom: 12px;
}
.step-desc {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Pricing */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 1100px;
    margin: 0 auto;
}
.pricing-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 40px;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}
.pricing-card.pro {
    border-color: var(--accent-purple);
    box-shadow: 0 10px 40px var(--accent-purple-glow);
}
.pricing-card.pro::before {
    content: 'RECOMMENDED';
    position: absolute;
    top: 25px;
    right: -40px;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    color: #FFF;
    font-size: 10px;
    font-weight: 800;
    padding: 4px 45px;
    transform: rotate(45deg);
    letter-spacing: 0.1em;
}
.pricing-title {
    font-size: 24px;
    margin-bottom: 8px;
}
.pricing-price {
    font-size: 48px;
    font-family: var(--font-heading);
    font-weight: 800;
    margin-bottom: 24px;
}
.pricing-price span {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 500;
}
.pricing-features {
    list-style: none;
    margin-bottom: 32px;
    flex: 1;
}
.pricing-features li {
    margin-bottom: 12px;
    font-size: 14px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}
.pricing-features li::before {
    content: '✓';
    color: var(--accent-mint);
    font-weight: bold;
}

/* FAQ Accordion */
.faq-grid {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.faq-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    overflow: hidden;
}
.faq-question {
    padding: 20px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 16px;
    transition: background var(--transition-fast);
}
.faq-question:hover {
    background: rgba(255, 255, 255, 0.05);
}
.faq-icon {
    font-size: 18px;
    color: var(--text-secondary);
    transition: transform 0.3s ease;
}
.faq-item.active .faq-icon {
    transform: rotate(45deg);
}
.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}
.faq-item.active .faq-answer {
    padding: 0 24px 24px 24px;
    max-height: 200px; /* arbitrary max height for animation */
}

/* Footer */
footer {
    border-top: 1px solid var(--border-glass);
    padding: 40px 0;
    margin-top: 80px;
    text-align: center;
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 20px;
}
.footer-links a {
    color: var(--text-secondary);
    font-size: 14px;
    text-decoration: none;
}
.footer-links a:hover {
    color: var(--text-primary);
}
.footer-copy {
    color: var(--text-muted);
    font-size: 12px;
}

@media (max-width: 768px) {
    .steps-grid, .pricing-grid {
        grid-template-columns: 1fr;
    }
}