/* Import Inter Font from Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(180deg, #FFFFFF 0%, #F5F7FA 100%);
    color: #1C2B33;
    overflow-x: hidden;
}

/* ============================================
   META DESIGN SYSTEM - COLOR SYSTEM
   ============================================ */

:root {
    /* Primary Blues */
    --meta-blue-70: #0173EC;
    --meta-blue-40: #64B5FF;
    
    /* Grayscale */
    --meta-gray-90: #272727;
    --meta-black: #000000;
    --meta-white: #FFFFFF;
    
    /* Alpha Ramps - Blue 70 */
    --meta-blue-100: #0173EC;
    --meta-blue-95: rgba(1, 115, 236, 0.95);
    --meta-blue-90: rgba(1, 115, 236, 0.9);
    --meta-blue-85: rgba(1, 115, 236, 0.85);
    --meta-blue-80: rgba(1, 115, 236, 0.8);
    --meta-blue-75: rgba(1, 115, 236, 0.75);
    --meta-blue-70: rgba(1, 115, 236, 0.7);
    --meta-blue-65: rgba(1, 115, 236, 0.65);
    --meta-blue-60: rgba(1, 115, 236, 0.6);
    --meta-blue-55: rgba(1, 115, 236, 0.55);
    --meta-blue-50: rgba(1, 115, 236, 0.5);
    --meta-blue-45: rgba(1, 115, 236, 0.45);
    --meta-blue-40: rgba(1, 115, 236, 0.4);
    --meta-blue-35: rgba(1, 115, 236, 0.35);
    --meta-blue-30: rgba(1, 115, 236, 0.3);
    --meta-blue-25: rgba(1, 115, 236, 0.25);
    --meta-blue-20: rgba(1, 115, 236, 0.2);
    --meta-blue-15: rgba(1, 115, 236, 0.15);
    --meta-blue-10: rgba(1, 115, 236, 0.1);
    --meta-blue-5: rgba(1, 115, 236, 0.05);
    
    /* Alpha Ramps - Light Blue */
    --meta-blue-light-100: #64B5FF;
    --meta-blue-light-95: rgba(100, 181, 255, 0.95);
    --meta-blue-light-90: rgba(100, 181, 255, 0.9);
    --meta-blue-light-85: rgba(100, 181, 255, 0.85);
    --meta-blue-light-80: rgba(100, 181, 255, 0.8);
    --meta-blue-light-75: rgba(100, 181, 255, 0.75);
    --meta-blue-light-70: rgba(100, 181, 255, 0.7);
    --meta-blue-light-65: rgba(100, 181, 255, 0.65);
    --meta-blue-light-60: rgba(100, 181, 255, 0.6);
    --meta-blue-light-55: rgba(100, 181, 255, 0.55);
    --meta-blue-light-50: rgba(100, 181, 255, 0.5);
    --meta-blue-light-45: rgba(100, 181, 255, 0.45);
    --meta-blue-light-40: rgba(100, 181, 255, 0.4);
    --meta-blue-light-35: rgba(100, 181, 255, 0.35);
    --meta-blue-light-30: rgba(100, 181, 255, 0.3);
    --meta-blue-light-25: rgba(100, 181, 255, 0.25);
    --meta-blue-light-20: rgba(100, 181, 255, 0.2);
    --meta-blue-light-15: rgba(100, 181, 255, 0.15);
    --meta-blue-light-10: rgba(100, 181, 255, 0.1);
    
    /* Alpha Ramps - Gray */
    --meta-gray-100: #272727;
    --meta-gray-95: rgba(39, 39, 39, 0.95);
    --meta-gray-90: rgba(39, 39, 39, 0.9);
    --meta-gray-85: rgba(39, 39, 39, 0.85);
    --meta-gray-80: rgba(39, 39, 39, 0.8);
    --meta-gray-75: rgba(39, 39, 39, 0.75);
    --meta-gray-70: rgba(39, 39, 39, 0.7);
    --meta-gray-65: rgba(39, 39, 39, 0.65);
    --meta-gray-60: rgba(39, 39, 39, 0.6);
    --meta-gray-55: rgba(39, 39, 39, 0.55);
    --meta-gray-50: rgba(39, 39, 39, 0.5);
    --meta-gray-45: rgba(39, 39, 39, 0.45);
    --meta-gray-40: rgba(39, 39, 39, 0.4);
    --meta-gray-35: rgba(39, 39, 39, 0.35);
    --meta-gray-30: rgba(39, 39, 39, 0.3);
    --meta-gray-25: rgba(39, 39, 39, 0.25);
    --meta-gray-20: rgba(39, 39, 39, 0.2);
    --meta-gray-15: rgba(39, 39, 39, 0.15);
    --meta-gray-10: rgba(39, 39, 39, 0.1);
    --meta-gray-5: rgba(39, 39, 39, 0.05);
    
    /* Alpha Ramps - Black */
    --meta-black-100: #000000;
    --meta-black-95: rgba(0, 0, 0, 0.95);
    --meta-black-90: rgba(0, 0, 0, 0.9);
    --meta-black-85: rgba(0, 0, 0, 0.85);
    --meta-black-80: rgba(0, 0, 0, 0.8);
    --meta-black-75: rgba(0, 0, 0, 0.75);
    --meta-black-70: rgba(0, 0, 0, 0.7);
    --meta-black-65: rgba(0, 0, 0, 0.65);
    --meta-black-60: rgba(0, 0, 0, 0.6);
    --meta-black-55: rgba(0, 0, 0, 0.55);
    --meta-black-50: rgba(0, 0, 0, 0.5);
    --meta-black-45: rgba(0, 0, 0, 0.45);
    --meta-black-40: rgba(0, 0, 0, 0.4);
    --meta-black-35: rgba(0, 0, 0, 0.35);
    --meta-black-30: rgba(0, 0, 0, 0.3);
    --meta-black-25: rgba(0, 0, 0, 0.25);
    --meta-black-20: rgba(0, 0, 0, 0.2);
    --meta-black-15: rgba(0, 0, 0, 0.15);
    --meta-black-10: rgba(0, 0, 0, 0.1);
    --meta-black-5: rgba(0, 0, 0, 0.05);
    
    /* Alpha Ramps - White */
    --meta-white-100: #FFFFFF;
    --meta-white-95: rgba(255, 255, 255, 0.95);
    --meta-white-90: rgba(255, 255, 255, 0.9);
    --meta-white-85: rgba(255, 255, 255, 0.85);
    --meta-white-80: rgba(255, 255, 255, 0.8);
    --meta-white-75: rgba(255, 255, 255, 0.75);
    --meta-white-70: rgba(255, 255, 255, 0.7);
    --meta-white-65: rgba(255, 255, 255, 0.65);
    --meta-white-60: rgba(255, 255, 255, 0.6);
    --meta-white-55: rgba(255, 255, 255, 0.55);
    --meta-white-50: rgba(255, 255, 255, 0.5);
    --meta-white-45: rgba(255, 255, 255, 0.45);
    --meta-white-40: rgba(255, 255, 255, 0.40);
    --meta-white-35: rgba(255, 255, 255, 0.35);
    --meta-white-30: rgba(255, 255, 255, 0.3);
    --meta-white-25: rgba(255, 255, 255, 0.25);
    --meta-white-20: rgba(255, 255, 255, 0.2);
    --meta-white-15: rgba(255, 255, 255, 0.15);
    --meta-white-10: rgba(255, 255, 255, 0.1);
    --meta-white-5: rgba(255, 255, 255, 0.05);
    
    /* Legacy/Shorthand Variables */
    --meta-blue: #0173EC;
    --meta-blue-hover: #0952CC;
    --meta-dark: #1C2B33;
    --meta-light-bg: #F0F2F5;
}

/* ============================================
   META DESIGN SYSTEM - TYPOGRAPHY SYSTEM
   ============================================ */

/* Headline 1 - Large section headers */
.meta-headline-1 {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 32px;
    line-height: 36px;
    letter-spacing: -1px;
    color: #000000;
}

/* Headline 2 - Medium section headers */
.meta-headline-2 {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 20px;
    line-height: 24px;
    letter-spacing: -0.5px;
    color: #000000;
}

/* Headline 3 - Small section headers */
.meta-headline-3 {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 17px;
    line-height: 20px;
    letter-spacing: -0.2px;
    color: #000000;
}

/* Body 1 Emphasized - Bold body text */
.meta-body-1-emphasized {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 14px;
    line-height: 20px;
    color: #000000;
}

/* Body 1 - Regular body text */
.meta-body-1 {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 14px;
    line-height: 20px;
    color: #000000;
}

/* Body 2 Emphasized - Bold small text */
.meta-body-2-emphasized {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 12px;
    line-height: 16px;
    color: #000000;
}

/* Body 2 - Regular small text */
.meta-body-2 {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 12px;
    line-height: 16px;
    color: #000000;
}

/* Subheadline - Labels and captions */
.meta-subheadline {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 12px;
    line-height: 16px;
    color: rgba(0, 0, 0, 0.6);
}

/* Meta Text - Smallest text style */
.meta-text {
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: 11px;
    line-height: 16px;
    color: #000000;
}

/* Secondary text color modifier */
.meta-text-secondary {
    color: rgba(0, 0, 0, 0.6);
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: #FFFFFF;
    backdrop-filter: blur(10px);
    padding: 16px 72px;
    box-shadow: 0px 1px 1px rgba(39, 39, 39, 0.05), inset 0px -1px 1px rgba(39, 39, 39, 0.05);
    z-index: 1000;
    transition: all 0.3s ease;
}

nav.scrolled {
    padding: 12px 72px;
}

.nav-content {
    max-width: 1634px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    line-height: 28px;
    letter-spacing: -0.5px;
    color: var(--meta-blue-100);
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--meta-dark);
    font-weight: 500;
    font-size: 15px;
    line-height: 20px;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--meta-blue);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 72px 64px;
    position: relative;
}

.hero-content {
    max-width: 900px;
    width: 100%;
    text-align: center;
    animation: fadeInUp 1s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1 {
    font-size: 56px;
    font-weight: 700;
    line-height: 64px;
    color: var(--meta-dark);
    margin-bottom: 20px;
}

.subtitle {
    font-size: 20px;
    font-weight: 400;
    line-height: 28px;
    color: var(--meta-gray);
    margin-bottom: 48px;
}

/* Tool Card */
.tool-card {
    background: #FFFFFF;
    border-radius: 16px;
    padding: 64px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    animation: slideIn 0.8s ease 0.3s both;
    max-width: 900px;
    margin: 0 auto;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.input-group {
    margin-bottom: 32px;
}

textarea {
    width: 100%;
    min-height: 200px;
    padding: 20px;
    border: 2px solid #E4E6EB;
    border-radius: 12px;
    font-size: 16px;
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    line-height: 24px;
    color: var(--meta-dark);
    background: #F7F8FA;
    resize: vertical;
    transition: all 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--meta-blue);
    background: #FFFFFF;
    box-shadow: 0 0 0 3px rgba(8, 102, 255, 0.1);
}

.button-group {
    display: flex;
    gap: 16px;
    justify-content: center;
}

button {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    padding: 14px 32px;
    min-width: 140px;
    min-height: 52px;
    font-size: 17px;
    font-weight: 600;
    line-height: 24px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.analyze-btn {
    background: var(--meta-blue-100);
    color: var(--meta-white-100);
}

.analyze-btn:hover {
    background: var(--meta-blue-95);
    transform: translateY(-1px);
    box-shadow: 0px 4px 12px var(--meta-blue-30);
}

.analyze-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.clear-btn {
    background: var(--meta-gray-10);
    color: var(--meta-gray-100);
}

.clear-btn:hover {
    background: var(--meta-gray-20);
}

/* Results */
.results {
    margin-top: 32px;
    padding: 40px;
    border-radius: 12px;
    animation: fadeIn 0.5s ease;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.results.biased {
    background: linear-gradient(135deg, #E74C3C 0%, #C0392B 100%);
    color: #FFFFFF;
}

.results.not-biased {
    background: linear-gradient(135deg, #27AE60 0%, #229954 100%);
    color: #FFFFFF;
}

.result-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.result-text {
    font-size: 28px;
    font-weight: 700;
    line-height: 36px;
    margin-bottom: 12px;
}

.result-description {
    font-size: 18px;
    font-weight: 400;
    line-height: 28px;
    opacity: 0.95;
}

/* Sections */
section {
    padding: 80px 72px;
    background: #FFFFFF;
}

section:nth-child(even) {
    background: #F2F2F2;
}

.container {
    max-width: 1634px;
    margin: 0 auto;
}

h2 {
    font-size: 48px;
    font-weight: 700;
    line-height: 56px;
    margin-bottom: 20px;
    text-align: center;
    color: var(--meta-dark);
}

.section-subtitle {
    text-align: center;
    color: var(--meta-gray);
    font-size: 18px;
    font-weight: 400;
    line-height: 28px;
    margin-bottom: 48px;
}

/* About Cards */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    margin-top: 48px;
}

.about-card {
    background: #FFFFFF;
    padding: 32px;
    border-radius: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

section:nth-child(even) .about-card {
    background: #FFFFFF;
}

.about-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(8, 102, 255, 0.15);
    border-color: var(--meta-blue);
}

.card-icon {
    width: 56px;
    height: 56px;
    margin-bottom: 20px;
    color: var(--meta-blue-100);
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-icon svg {
    width: 100%;
    height: 100%;
    stroke-width: 2;
}

.card-title {
    font-size: 24px;
    font-weight: 700;
    line-height: 32px;
    margin-bottom: 12px;
    color: var(--meta-dark);
}

.card-text {
    color: var(--meta-gray);
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 48px;
}

.stat-card {
    text-align: center;
    padding: 40px;
    background: linear-gradient(135deg, var(--meta-blue) 0%, #0952CC 100%);
    color: #FFFFFF;
    border-radius: 16px;
    box-shadow: 0px 4px 16px rgba(8, 102, 255, 0.2);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0px 8px 24px rgba(8, 102, 255, 0.3);
}

.stat-number {
    font-size: 56px;
    font-weight: 700;
    line-height: 64px;
    margin-bottom: 12px;
}

.stat-label {
    font-size: 16px;
    font-weight: 500;
    line-height: 24px;
    opacity: 0.95;
}

/* Chart */
.chart-container {
    background: #FFFFFF;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    margin-top: 32px;
    border: 2px solid #E4E6EB;
}

.chart-title {
    font-size: 24px;
    font-weight: 700;
    line-height: 32px;
    margin-bottom: 28px;
    color: var(--meta-dark);
    text-align: center;
}

/* Team */
.team-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 24px;
    margin-top: 48px;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

.team-grid .team-member {
    flex: 0 0 calc(33.333% - 24px);
    max-width: 280px;
}

.team-grid .team-member:nth-child(n+4) {
    flex: 0 0 calc(25% - 24px);
    max-width: 280px;
}

.team-member {
    text-align: center;
    padding: 32px 24px;
    background: #FFFFFF;
    border-radius: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

section:nth-child(even) .team-member {
    background: #FFFFFF;
}

.team-member:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(8, 102, 255, 0.15);
    border-color: var(--meta-blue);
}

.member-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--meta-blue) 0%, #0952CC 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
    font-size: 36px;
    font-weight: 700;
    margin: 0 auto 20px;
    box-shadow: 0px 4px 12px rgba(8, 102, 255, 0.2);
}

.member-name {
    font-weight: 700;
    font-size: 18px;
    line-height: 24px;
    color: var(--meta-dark);
    margin-bottom: 8px;
}

.member-email {
    font-size: 14px;
    font-weight: 400;
    line-height: 20px;
    color: var(--meta-gray);
}

/* Loading */
.loading {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 4px solid rgba(8, 102, 255, 0.2);
    border-radius: 50%;
    border-top-color: var(--meta-blue);
    animation: spin 1s ease-in-out infinite;
}

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

/* Footer */
footer {
    background: var(--meta-dark);
    color: #FFFFFF;
    padding: 48px 72px;
    text-align: center;
}

.footer-content {
    max-width: 1634px;
    margin: 0 auto;
}

.footer-content p {
    margin: 12px 0;
    font-size: 15px;
    line-height: 24px;
    color: rgba(255, 255, 255, 0.7);
}

.footer-thanks {
    font-size: 14px !important;
    color: rgba(255, 255, 255, 0.5) !important;
    margin-top: 8px !important;
}

/* Responsive */
@media (max-width: 768px) {
    nav {
        padding: 16px 24px;
    }

    nav.scrolled {
        padding: 12px 24px;
    }

    .hero {
        padding: 100px 24px 48px;
    }

    h1 {
        font-size: 36px;
        line-height: 44px;
    }

    .subtitle {
        font-size: 16px;
        line-height: 24px;
    }

    .tool-card {
        padding: 32px 24px;
    }

    textarea {
        min-height: 160px;
        font-size: 15px;
    }

    button {
        font-size: 16px;
        padding: 12px 24px;
    }

    .nav-links {
        gap: 16px;
        font-size: 14px;
    }

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

    button {
        width: 100%;
    }

    section {
        padding: 56px 24px;
    }

    h2 {
        font-size: 36px;
        line-height: 44px;
    }

    .section-subtitle {
        font-size: 16px;
    }

    .team-grid .team-member {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .team-grid .team-member:nth-child(n+4) {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .card-title {
        font-size: 20px;
    }

    .card-text {
        font-size: 15px;
    }

    footer {
        padding: 40px 24px;
    }

    .footer-content p {
        font-size: 14px;
    }
}