/* ================================
   VARIABLES & COLOR SCHEME
   ================================ */
:root {
    --color-primary: #D4A632;        /* Darker gold for better contrast */
    --color-primary-light: #ECBC4A;  /* Original gold, use for decorative only */
    --color-dark: #0f172a;           /* Very dark blue-gray (dark mode bg) */
    --color-dark-secondary: #1e293b; /* Secondary dark (cards/sections) */
    --color-light: #1e293b;          /* Light in dark mode (secondary bg) */
    --color-text: #f1f5f9;           /* Light text (off-white) */
    --color-text-light: #94a3b8;     /* Medium gray (secondary text) */
    --color-border: #334155;         /* Darker border for dark mode */
    --color-success: #10b981;        /* Green */
    --color-background: #0f172a;     /* Dark background */
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.6;
    font-size: 16px;
}

/* ================================
   SKIP NAVIGATION LINK
   ================================ */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #0f172a;
    color: #F5D76E;
    padding: 12px 16px;
    text-decoration: none;
    z-index: 10000;
    font-weight: 700;
    border-radius: 0 0 4px 0;
    border: 2px solid #D4A632;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid #F5D76E;
    outline-offset: 2px;
    background: #1e293b;
}

/* ================================
   FOCUS INDICATORS
   ================================ */
*:focus-visible {
    outline: 3px solid #D4A632;
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 3px solid #D4A632;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(212, 166, 50, 0.2);
}

*:focus {
    outline: none;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* ================================
   CONTAINER & LAYOUT
   ================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ================================
   HEADER
   ================================ */
.header {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border-bottom: 3px solid var(--color-primary);
    color: white;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.header-branding {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    justify-content: flex-start;
    flex-wrap: wrap;
}

.logo-main {
    height: 80px;
    width: auto;
    max-width: 120px;
    display: block;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.3));
    transition: var(--transition);
}

.logo-main:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 6px 12px rgba(0, 0, 0, 0.4));
}

.logo-link {
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.header-text {
    text-align: left;
    flex: 1;
    min-width: 250px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0;
}

.header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.2rem;
    letter-spacing: -1px;
    color: #F5D76E;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
    line-height: 1;
}

.header .subtitle {
    font-size: 1.05rem;
    opacity: 0.9;
    font-weight: 300;
    color: var(--color-text-light);
    line-height: 1.3;
    margin: 0;
}

/* ================================
   HEADER PRICE WIDGET
   ================================ */
.header-price-widget {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-left: auto;
    padding: var(--spacing-md);
    background: rgba(236, 188, 74, 0.1);
    border: 1px solid rgba(236, 188, 74, 0.3);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    min-width: 200px;
}

.price-widget-content {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--spacing-xs);
}

.price-widget-label {
    font-size: 0.85rem;
    color: var(--color-text-light);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.8;
}

.price-widget-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: #F5D76E;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
    letter-spacing: -0.5px;
}

.price-widget-date {
    font-size: 0.8rem;
    color: var(--color-text-light);
    font-weight: 400;
    opacity: 0.75;
}

@media (max-width: 1024px) {
    .header-branding {
        gap: var(--spacing-md);
    }
    
    .header h1 {
        font-size: 2.5rem;
    }
    
    .header .subtitle {
        font-size: 1rem;
    }
    
    .logo-main {
        height: 70px;
    }
    
    .header-price-widget {
        min-width: 180px;
        padding: var(--spacing-sm);
    }
    
    .price-widget-value {
        font-size: 1.25rem;
    }
}

@media (max-width: 768px) {
    .header {
        padding: var(--spacing-lg) 0;
    }
    
    .header-content {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }
    
    .header-branding {
        width: 100%;
    }
    
    .header-text {
        text-align: center;
        min-width: 100%;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .header .subtitle {
        font-size: 0.95rem;
    }
    
    .logo-main {
        height: 60px;
    }
    
    .header-price-widget {
        width: 100%;
        justify-content: center;
        margin-left: 0;
    }
    
    .price-widget-content {
        align-items: center;
    }
}

@media (max-width: 480px) {
    .header-branding {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .header h1 {
        font-size: 1.75rem;
    }
    
    .header .subtitle {
        font-size: 0.9rem;
    }
    
    .logo-main {
        height: 50px;
    }
}

/* ================================
   NAVIGATION
   ================================ */
.navigation {
    background-color: var(--color-dark-secondary);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
    background-color: rgba(30, 41, 59, 0.95);
}

.navigation ul {
    display: flex;
    justify-content: flex-start;
    list-style: none;
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: var(--spacing-lg);
}

.navigation li {
    flex: 1 1 auto;
    min-width: 120px;
}

.navigation .nav-link {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    color: var(--color-text);
    border-bottom: 3px solid transparent;
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.95rem;
}

.navigation .nav-link:hover {
    background-color: rgba(245, 158, 11, 0.1);
    border-bottom-color: #F5D76E;
    text-decoration: none;
    color: #F5D76E;
}

@media (max-width: 1024px) {
    .navigation li {
        min-width: 110px;
    }

    .navigation .nav-link {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }
}

@media (max-width: 768px) {
    .navigation {
        display: none;
    }
    
    .navigation ul {
        flex-wrap: wrap;
    }
    
    .navigation li {
        flex: 0 1 50%;
        min-width: auto;
    }
    
    .navigation .nav-link {
        padding: var(--spacing-sm);
        font-size: 0.85rem;
    }
}

/* ================================
   MAIN CONTENT
   ================================ */
.main-content {
    min-height: calc(100vh - 200px);
}

/* ================================
   GRAPH SECTIONS
   ================================ */
.graph-section {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--color-border);
}

.graph-section:last-of-type {
    border-bottom: none;
}

.graph-section--secondary {
    background-color: var(--color-dark-secondary);
}

.graph-section h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: #F5D76E;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.graph-section .description {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    font-size: 1.05rem;
    line-height: 1.8;
}

/* ================================
   PERIOD SWITCHER
   ================================ */
.period-switcher {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.switcher-label {
    font-weight: 500;
    color: var(--color-text);
    font-size: 0.95rem;
}

.switcher-buttons {
    display: flex;
    background-color: var(--color-dark-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    gap: 0;
}

.switcher-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background-color: transparent;
    color: var(--color-text-light);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
}

.switcher-btn:hover {
    background-color: rgba(245, 158, 11, 0.05);
    color: var(--color-text);
}

.switcher-btn--active {
    background-color: var(--color-primary);
    color: #1a1a1a;
}

.switcher-btn--active:hover {
    background-color: #D4A632;
    color: #1a1a1a;
}

@media (max-width: 768px) {
    .period-switcher {
        gap: var(--spacing-sm);
    }

    .switcher-btn {
        padding: var(--spacing-sm);
        font-size: 0.9rem;
    }
}

/* ================================
   STOCK SWITCHER CONTAINER
   ================================ */
.stock-switcher-container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.period-switcher {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: 0;
}

.stock-selector {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-md);
    margin-left: auto;
}

.stock-buttons-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

.stock-buttons-container .switcher-btn {
    flex: 0 1 auto;
    padding: var(--spacing-sm) var(--spacing-md);
}

@media (max-width: 768px) {
    .stock-switcher-container {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }

    .period-switcher {
        width: 100%;
    }

    .stock-selector {
        justify-content: flex-start;
        margin-left: 0;
        width: 100%;
    }

    .stock-buttons-container {
        width: 100%;
        gap: var(--spacing-xs);
        justify-content: flex-start;
    }

    .stock-buttons-container .switcher-btn {
        flex: 1 1 auto;
        min-width: 100px;
    }
}

/* ================================
   CHART WRAPPER
   ================================ */
.chart-wrapper {
    background-color: var(--color-dark-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
    position: relative;
    height: 400px;
}

@media (max-width: 768px) {
    .chart-wrapper {
        height: 300px;
        padding: var(--spacing-md);
    }
}

.chart-wrapper canvas {
    width: 100% !important;
    height: 100% !important;
}

/* ================================
   CHART STATISTICS
   ================================ */
.chart-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.stat {
    background-color: var(--color-dark-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid #D4A632;
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-light);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: #F5D76E;
}

@media (max-width: 768px) {
    .chart-stats {
        grid-template-columns: 1fr;
    }
}

/* ================================
   INFO SECTION
   ================================ */
.info-section {
    background-color: var(--color-dark-secondary);
    padding: var(--spacing-xl) 0;
    border-top: 2px solid var(--color-border);
}

.info-section h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: #F5D76E;
}

.info-section p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    line-height: 1.8;
}

.info-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.info-subsection h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    color: #F5D76E;
}

.info-subsection ul {
    list-style-position: inside;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.info-subsection li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
    color: var(--color-text);
    padding-left: var(--spacing-sm);
}

.info-subsection li strong {
    color: var(--color-primary);
    font-weight: 600;
}

.disclaimer {
    font-size: 0.9rem;
    color: var(--color-text-light);
    font-style: italic;
    background-color: rgba(245, 158, 11, 0.15);
    padding: var(--spacing-md);
    border-radius: var(--spacing-md);
    border-left: 4px solid #D4A632;
}

/* ================================
   FOOTER
   ================================ */
.footer {
    background-color: var(--color-dark);
    color: white;
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
}

.footer a {
    color: var(--color-primary);
}

.footer p {
    margin: var(--spacing-sm) 0;
}

/* ================================
   RESPONSIVE DESIGN
   ================================ */
@media (max-width: 768px) {
    .graph-section h2 {
        font-size: 1.5rem;
    }
    
    .graph-section .description {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 14px;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    .header .subtitle {
        font-size: 0.9rem;
    }
    
    .graph-section h2 {
        font-size: 1.25rem;
    }
    
    .stat-value {
        font-size: 1.25rem;
    }
}

/* ================================
   GOLD CONVERTER SECTION
   ================================ */
.gold-converter-section {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.08) 0%, rgba(217, 119, 6, 0.08) 100%);
}

.converter-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

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

.converter-form {
    background-color: var(--color-dark-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group:last-of-type {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    font-size: 0.95rem;
}

.form-input {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    color: var(--color-text);
    background-color: var(--color-dark);
    transition: var(--transition);
    font-family: inherit;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

.form-input.error {
    border-color: #ef4444;
}

.required-indicator {
    color: #ef4444;
    font-weight: bold;
    margin-left: 4px;
}

.error-message {
    display: none;
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: 4px;
}

.error-message.visible {
    display: block;
}

.form-help {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-top: 4px;
}

.converter-btn {
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--color-primary);
    color: #000000;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.converter-btn:hover {
    background-color: #E5C050;
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.converter-btn:active {
    transform: translateY(0);
}

.converter-btn:disabled {
    background-color: #64748b;
    color: #e2e8f0;
    cursor: not-allowed;
    transform: none;
}

/* Results Display */
.converter-results {
    background-color: var(--color-dark-secondary);
    border: 2px solid #D4A632;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.converter-results h3 {
    margin-bottom: var(--spacing-md);
    color: #F5D76E;
    font-size: 1.25rem;
}

.result-card {
    background-color: var(--color-dark);
    border-left: 4px solid #D4A632;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-md);
}

.result-label {
    font-size: 0.85rem;
    color: var(--color-text-light);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.result-time-info {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.result-value {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.pln-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: #3b82f6;
    flex: 1;
    min-width: 120px;
}

.separator {
    color: var(--color-text-light);
    font-weight: 300;
    font-size: 1.2rem;
}

.gold-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: #F5D76E;
    flex: 1;
    min-width: 120px;
}

/* Comparison Result */
.comparison-result {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.12) 0%, rgba(217, 119, 6, 0.12) 100%);
    border: 2px solid #D4A632;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    text-align: center;
}

.comparison-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.comparison-indicator {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
}

.comparison-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: 1.05rem;
    min-width: 200px;
}

.badge-icon {
    font-size: 2rem;
}

.badge-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.badge-label {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.badge-percentage {
    font-size: 1.5rem;
    font-weight: 800;
}

.comparison-badge.more {
    background: linear-gradient(135deg, rgba(212, 166, 50, 0.15) 0%, rgba(236, 188, 74, 0.15) 100%);
    color: #F5D76E;
    border: 2px solid #D4A632;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.comparison-badge.same {
    background: linear-gradient(135deg, rgba(148, 163, 184, 0.15) 0%, rgba(203, 213, 225, 0.15) 100%);
    color: #cbd5e1;
    border: 2px solid #64748b;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.comparison-badge.less {
    background: linear-gradient(135deg, rgba(239, 121, 121, 0.15) 0%, rgba(252, 165, 165, 0.15) 100%);
    color: #fca5a5;
    border: 2px solid #dc2626;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.change-percentage {
    font-size: 1.3rem;
    font-weight: 700;
    margin-left: var(--spacing-sm);
}

@media (max-width: 768px) {
    .converter-container {
        grid-template-columns: 1fr;
    }

    .converter-form,
    .converter-results {
        padding: var(--spacing-md);
    }

    .result-value {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .pln-value,
    .gold-value {
        width: 100%;
        text-align: left;
    }

    .separator {
        align-self: flex-start;
        margin: var(--spacing-xs) 0;
    }
}

/* ================================
   UTILITY CLASSES
   ================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center {
    text-align: center;
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

/* ================================
   ANIMATIONS
   ================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes goldGlow {
    0%, 100% {
        filter: drop-shadow(0 4px 6px rgba(245, 158, 11, 0.2));
    }
    50% {
        filter: drop-shadow(0 8px 12px rgba(245, 158, 11, 0.4));
    }
}

.header {
    animation: slideDown 0.8s ease-out;
}

.graph-section {
    animation: fadeIn 0.6s ease-in-out;
}