:root {
    /* Color System - Premium Dark Theme */
    --color-bg-primary: #0A0E27;
    --color-bg-secondary: #1A1F3A;
    --color-bg-tertiary: #252B4A;
    --color-bg-glass: rgba(26, 31, 58, 0.7);

    --color-primary: #00D9FF;
    --color-primary-hover: #00B8D9;
    --color-primary-glow: rgba(0, 217, 255, 0.3);

    --color-secondary: #B537F2;
    --color-secondary-hover: #9B2DD1;
    --color-secondary-glow: rgba(181, 55, 242, 0.3);

    --color-success: #00F5A0;
    --color-success-glow: rgba(0, 245, 160, 0.3);

    --color-warning: #FFB020;
    --color-warning-glow: rgba(255, 176, 32, 0.3);

    --color-error: #FF6B6B;
    --color-error-glow: rgba(255, 107, 107, 0.3);

    --color-text-primary: #FFFFFF;
    --color-text-secondary: #B8C5D0;
    --color-text-muted: #6B7A8F;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #00D9FF 0%, #B537F2 100%);
    --gradient-bg: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 50%, #252B4A 100%);
    --gradient-card: linear-gradient(135deg, rgba(26, 31, 58, 0.8) 0%, rgba(37, 43, 74, 0.6) 100%);

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

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow-primary: 0 0 20px var(--color-primary-glow);
    --shadow-glow-secondary: 0 0 20px var(--color-secondary-glow);
    --shadow-glow-success: 0 0 20px var(--color-success-glow);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Z-index */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-overlay: 300;
    --z-modal: 400;
    --z-toast: 500;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

h1 {
    font-size: var(--font-size-4xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
}

p {
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
}

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

a:hover {
    color: var(--color-primary-hover);
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    padding: 0.2em 0.4em;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* Glass Card */
.glass-card {
    background: var(--gradient-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.glass-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 0.75rem 1.5rem;
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width var(--transition-base), height var(--transition-base);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-glow-primary);
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-glow-primary), var(--shadow-md);
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-primary);
}

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

/* Input Fields */
.input {
    width: 100%;
    padding: 0.875rem 1.25rem;
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    outline: none;
    transition: all var(--transition-base);
}

.input:focus {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow-primary);
    background: var(--color-bg-tertiary);
}

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

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.25rem 0.75rem;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success {
    background: var(--color-success-glow);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

.badge-warning {
    background: var(--color-warning-glow);
    color: var(--color-warning);
    border: 1px solid var(--color-warning);
}

.badge-error {
    background: var(--color-error-glow);
    color: var(--color-error);
    border: 1px solid var(--color-error);
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Progress Bar */
.progress {
    width: 100%;
    height: 8px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(100%);
    }
}

/* Metric Card */
.metric-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    border-left: 4px solid var(--color-primary);
    transition: all var(--transition-base);
}

.metric-card:hover {
    transform: translateX(4px);
    border-left-color: var(--color-secondary);
}

.metric-value {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.metric-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: var(--space-xs);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.fade-in {
    animation: fadeIn var(--transition-slow) ease-out;
}

.slide-in-left {
    animation: slideInLeft var(--transition-base) ease-out;
}

.pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

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

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

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.mt-xs {
    margin-top: var(--space-xs);
}

.mt-sm {
    margin-top: var(--space-sm);
}

.mt-md {
    margin-top: var(--space-md);
}

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

.mt-xl {
    margin-top: var(--space-xl);
}

.mb-xs {
    margin-bottom: var(--space-xs);
}

.mb-sm {
    margin-bottom: var(--space-sm);
}

.mb-md {
    margin-bottom: var(--space-md);
}

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

.mb-xl {
    margin-bottom: var(--space-xl);
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

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

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-xs {
    gap: var(--space-xs);
}

.gap-sm {
    gap: var(--space-sm);
}

.gap-md {
    gap: var(--space-md);
}

.gap-lg {
    gap: var(--space-lg);
}

.grid {
    display: grid;
    gap: var(--space-md);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.hidden {
    display: none;
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.5rem;
    }

    .container {
        padding: 0 var(--space-sm);
    }

    .glass-card {
        padding: var(--space-md);
    }

    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-hover);
}

/* ===== Component Styles ===== */

/* Header */
.header {
    padding: var(--space-md) 0;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(10, 14, 39, 0.8);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.logo-icon {
    font-size: var(--font-size-2xl);
    animation: pulse 2s ease-in-out infinite;
}

.logo-text {
    color: var(--color-text-primary);
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-link:hover::after {
    width: 100%;
}

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

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    margin-bottom: var(--space-md);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.6;
}

/* Analyzer Form */
.analyzer-form {
    max-width: 700px;
    margin: 0 auto;
    text-align: left;
}

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

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: var(--font-weight-semibold);
}

.label-hint {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-weight: var(--font-weight-normal);
    margin-top: var(--space-xs);
}

.input-group {
    display: flex;
    gap: var(--space-sm);
}

.input-group .input {
    flex: 1;
}

/* Loading State */
.loading-state {
    text-align: center;
    padding: var(--space-xl);
}

.loading-state .spinner {
    margin: 0 auto var(--space-md);
}

.loading-text {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

/* Score Section */
.score-section {
    margin-top: var(--space-xl);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    font-size: var(--font-size-2xl);
}

.section-title .icon {
    font-size: var(--font-size-3xl);
}

.score-display {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    flex-wrap: wrap;
}

.score-circle {
    position: relative;
    width: 200px;
    height: 200px;
}

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

.score-bg {
    fill: none;
    stroke: var(--color-bg-tertiary);
    stroke-width: 12;
}

.score-fill {
    fill: none;
    stroke: url(#scoreGradient);
    stroke-width: 12;
    stroke-linecap: round;
    stroke-dasharray: 565;
    stroke-dashoffset: 565;
    transition: stroke-dashoffset 1s ease-out;
}

.score-value {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.score-info {
    flex: 1;
    min-width: 300px;
}

.score-info h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--space-sm);
}

.score-info p {
    font-size: var(--font-size-base);
}

/* Metric Cards */
.vitals-section,
.additional-metrics,
.recommendations-section {
    margin-top: var(--space-xl);
}

.metric-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.metric-icon {
    font-size: var(--font-size-2xl);
}

.metric-name {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.metric-status {
    margin: var(--space-sm) 0;
}

.metric-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* Recommendations */
.recommendations-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.recommendation-item {
    padding: var(--space-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-warning);
    transition: all var(--transition-base);
}

.recommendation-item:hover {
    transform: translateX(8px);
    border-left-color: var(--color-primary);
}

.recommendation-item.high-impact {
    border-left-color: var(--color-error);
}

.recommendation-item.medium-impact {
    border-left-color: var(--color-warning);
}

.recommendation-item.low-impact {
    border-left-color: var(--color-success);
}

.recommendation-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--space-sm);
    gap: var(--space-md);
}

.recommendation-title {
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-lg);
}

.recommendation-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
    line-height: 1.6;
}

.recommendation-code {
    background: var(--color-bg-primary);
    padding: var(--space-md);
    border-radius: var(--radius-sm);
    margin-top: var(--space-sm);
    overflow-x: auto;
}

.recommendation-code code {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    white-space: pre;
}

/* History */
.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md);
    background: var(--gradient-card);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
}

.history-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.history-info {
    flex: 1;
}

.history-url {
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-xs);
    color: var(--color-text-primary);
}

.history-date {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.history-score {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Footer */
.footer {
    padding: var(--space-xl) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: var(--space-2xl);
}

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

/* Toast Notification */
.toast {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    background: var(--gradient-card);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-toast);
    animation: slideInRight 0.3s ease-out;
    max-width: 400px;
}

@keyframes slideInRight {
    from {
        transform: translateX(120%);
    }

    to {
        transform: translateX(0);
    }
}

.toast.success {
    border-left: 4px solid var(--color-success);
}

.toast.error {
    border-left: 4px solid var(--color-error);
}

.toast.warning {
    border-left: 4px solid var(--color-warning);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding: var(--space-xl) 0;
    }

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

    .score-display {
        flex-direction: column;
        text-align: center;
    }

    .recommendation-header {
        flex-direction: column;
        align-items: start;
    }

    .history-item {
        flex-direction: column;
        align-items: start;
        gap: var(--space-sm);
    }

    .toast {
        left: var(--space-md);
        right: var(--space-md);
        bottom: var(--space-md);
    }
}