/* Mobile Menu Overlay */
.mobile-menu {
    position: fixed;
    top: 64px;
    left: 0;
    width: 100vw;
    height: calc(100vh - 64px);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 32px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.25,0.46,0.45,0.94);
}
.mobile-menu.open {
    opacity: 1;
    pointer-events: auto;
}
.mobile-menu a {
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 600;
    text-decoration: none;
    padding: 12px 32px;
    border-radius: 24px;
    background: var(--surface-secondary);
    box-shadow: 0 4px 24px rgba(0,0,0,0.12);
    transition: background 0.2s, color 0.2s, transform 0.2s;
}
.mobile-menu a:hover {
    background: var(--primary-blue);
    color: #fff;
    transform: scale(1.05);
}
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 2100;
}
.hamburger span {
    display: block;
    width: 28px;
    height: 4px;
    background: var(--text-primary);
    margin: 4px 0;
    border-radius: 2px;
    transition: all 0.3s;
}
@media (max-width: 900px) {
    .nav-links {
        display: none !important;
    }
    .hamburger {
        display: flex;
    }
}
/* Hero SVG Background */
.hero-bg-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}
:root {
    --primary-blue: #007AFF;
    --primary-gray: #1C1C1E;
    --secondary-gray: #2C2C2E;
    --tertiary-gray: #3A3A3C;
    --quaternary-gray: #48484A;
    --separator-gray: #38383A;
    --background: #000000;
    --surface: #1C1C1E;
    --surface-secondary: #2C2C2E;
    --text-primary: #FFFFFF;
    --text-secondary: #EBEBF5;
    --text-tertiary: #EBEBF599;
    --accent-green: #30D158;
    --accent-orange: #FF9F0A;
    --accent-red: #FF453A;
    --accent-purple: #BF5AF2;
    --glass-bg: rgba(28, 28, 30, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 400;
    font-size: 16px;
    transition: color 0.2s ease;
}

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

/* Main Content */
main {
    margin-top: 80px;
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    text-align: center;
    background: radial-gradient(ellipse at center, rgba(0, 122, 255, 0.1) 0%, transparent 50%);
}

.hero h1 {
    font-size: clamp(36px, 5vw, 64px);
    font-weight: 700;
    letter-spacing: -0.04em;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.hero p {
    font-size: 18px;
    color: var(--text-tertiary);
    max-width: 600px;
    margin: 0 auto 48px;
    line-height: 1.5;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    background: var(--primary-blue);
    color: white;
    padding: 16px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: none;
    cursor: pointer;
}

.cta-button:hover {
    background: #0056CC;
    transform: translateY(-2px);
    box-shadow: 0 16px 40px rgba(0, 122, 255, 0.4);
}

.badge {
    display: inline-flex;
    align-items: center;
    background: var(--surface-secondary);
    border: 1px solid var(--separator-gray);
    padding: 12px 20px;
    border-radius: 24px;
    font-weight: 500;
    font-size: 14px;
    margin: 32px 0;
    color: var(--text-secondary);
}

/* Section Styling */
.section {
    padding: 64px 0;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 64px;
    letter-spacing: -0.03em;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.skill-card {
    background: var(--surface);
    border: 1px solid var(--separator-gray);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.skill-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-blue);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
}

.skill-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.skill-card p {
    color: var(--text-tertiary);
    font-size: 16px;
    line-height: 1.5;
}

/* Project Section */
.project {
    background: var(--surface);
    border: 1px solid var(--separator-gray);
    border-radius: 24px;
    padding: 48px;
    margin-bottom: 48px;
}

.project h3 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.project-meta {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.meta-item {
    background: var(--surface-secondary);
    border: 1px solid var(--separator-gray);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Dashboard */
.dashboard {
    background: var(--surface);
    border: 1px solid var(--separator-gray);
    border-radius: 20px;
    padding: 32px;
    margin: 48px 0;
    overflow: hidden;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--separator-gray);
}

.dashboard-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.dashboard-controls {
    display: flex;
    gap: 12px;
    align-items: center;
}

.control-button {
    background: var(--surface-secondary);
    border: 1px solid var(--separator-gray);
    color: var(--text-secondary);
    padding: 10px 16px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.control-button:hover {
    background: var(--tertiary-gray);
    border-color: var(--primary-blue);
}

.control-button.active {
    background: var(--primary-blue);
    border-color: var(--primary-blue);
    color: white;
}

/* Filter Panel */
.filter-panel {
    background: var(--surface-secondary);
    border: 1px solid var(--separator-gray);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 24px;
}

.filter-group {
    display: flex;
    gap: 16px;
    align-items: center;
    flex-wrap: wrap;
}

.filter-select {
    background: var(--surface);
    border: 1px solid var(--separator-gray);
    color: var(--text-secondary);
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    min-width: 140px;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-blue);
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 24px;
}

.dashboard-tile {
    background: var(--surface-secondary);
    border: 1px solid var(--separator-gray);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    cursor: pointer;
}

.dashboard-tile:hover {
    transform: translateY(-4px);
    border-color: var(--primary-blue);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.tile-header {
    background: var(--tertiary-gray);
    padding: 20px;
    border-bottom: 1px solid var(--separator-gray);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.tile-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.tile-actions {
    display: flex;
    gap: 8px;
}

.tile-action {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    transition: all 0.2s ease;
    font-size: 14px;
}

.tile-action:hover {
    color: var(--primary-blue);
    background: var(--surface);
}

.tile-content {
    padding: 24px;
}

/* KPI Card */
.kpi-card {
    text-align: center;
    padding: 32px 24px;
    background: linear-gradient(135deg, var(--accent-red), #FF6B47);
    border-radius: 16px;
    position: relative;
    overflow: hidden;
}

.kpi-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.kpi-number {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 8px;
    color: white;
    letter-spacing: -0.02em;
}

.kpi-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
}

.kpi-change {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.9);
    margin-top: 8px;
    font-weight: 500;
}

/* Chart Containers */
.chart-container {
    position: relative;
    height: 280px;
    margin: 16px 0;
}

.bar-chart-container {
    position: relative;
    height: 340px;
    margin: 16px 0;
}

/* Data Table */
.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--surface-secondary);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--separator-gray);
}

.data-table th {
    background: var(--tertiary-gray);
    padding: 16px;
    text-align: left;
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--separator-gray);
    cursor: pointer;
    transition: background 0.2s ease;
}

.data-table th:hover {
    background: var(--quaternary-gray);
}

.data-table td {
    padding: 16px;
    border-bottom: 1px solid var(--separator-gray);
    font-size: 14px;
    color: var(--text-secondary);
    transition: background 0.2s ease;
}

.data-table tr:hover {
    background: var(--tertiary-gray);
}

.data-table tr.selected {
    background: rgba(0, 122, 255, 0.1);
    border-left: 3px solid var(--primary-blue);
}

.customer-id {
    font-family: 'SF Mono', 'Monaco', monospace;
    font-size: 12px;
    color: var(--text-tertiary);
}

/* Insights Panel */
.insights-panel {
    background: var(--surface);
    border: 1px solid var(--separator-gray);
    border-radius: 12px;
    padding: 20px;
    margin-top: 20px;
}

.insight-item {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
    font-size: 14px;
    color: var(--text-secondary);
}

.insight-icon {
    margin-right: 12px;
    font-size: 16px;
}

/* Methodology */
.methodology {
    background: var(--surface);
    border: 1px solid var(--separator-gray);
    border-radius: 20px;
    padding: 40px;
    margin: 48px 0;
}

.methodology h4 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 32px;
    color: var(--text-primary);
}

.methodology-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.methodology-step {
    background: var(--surface-secondary);
    border: 1px solid var(--separator-gray);
    border-radius: 16px;
    padding: 24px;
    position: relative;
}

.step-number {
    background: var(--primary-blue);
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 16px;
}

.step-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.step-description {
    font-size: 14px;
    color: var(--text-tertiary);
    line-height: 1.5;
}

/* Results Grid */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin: 48px 0;
}

.result-card {
    background: var(--surface);
    border: 1px solid var(--separator-gray);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.result-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary-blue);
}

.result-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-blue);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    margin-bottom: 20px;
}

.result-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.result-description {
    font-size: 14px;
    color: var(--text-tertiary);
    line-height: 1.5;
}

/* Contact Section */
.contact {
    text-align: center;
    padding: 64px 0;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 48px;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 18px;
    padding: 10px 18px;
    border-radius: 12px;
    border: 1px solid var(--separator-gray);
    transition: all 0.3s ease;
}

.contact-item:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
    transform: translateY(-2px);
}

/* Footer */
footer {
    background: var(--surface);
    border-top: 1px solid var(--separator-gray);
    text-align: center;
    padding: 48px 0;
    color: var(--text-tertiary);
    font-size: 14px;
}

/* Animations */
.fade-in {
    animation: fadeIn 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

/* Notification */
.notification {
    position: fixed;
    top: 100px;
    right: 24px;
    background: var(--surface);
    border: 1px solid var(--separator-gray);
    color: var(--text-primary);
    padding: 16px 24px;
    border-radius: 16px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
    z-index: 10000;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    font-weight: 500;
    font-size: 14px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .nav-links {
        display: none;
    }

    .hero {
        padding: 80px 0 60px;
    }

    .hero h1 {
        font-size: 48px;
    }

    .section {
        padding: 80px 0;
    }

    .section-title {
        font-size: 32px;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .project {
        padding: 32px 24px;
    }

    .methodology {
        padding: 32px 24px;
    }

    .filter-group {
        flex-direction: column;
        align-items: stretch;
    }

    .contact-info {
        flex-direction: column;
        align-items: center;
        gap: 24px;
    }
}

@media (max-width: 480px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }

    .methodology-grid {
            grid-template-columns: 1fr;
        }
    }

/* Skip link (accessibility) */
.skip-link {
    position: absolute;
    top: -100px;
    left: 24px;
    background: var(--primary-blue);
    color: white;
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 500;
    text-decoration: none;
    z-index: 10001;
    transition: top 0.2s ease;
}
.skip-link:focus {
    top: 24px;
    outline: 2px solid white;
    outline-offset: 2px;
}

/* Loading / empty / error states */
.chart-loading,
.table-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    color: var(--text-tertiary);
    font-size: 14px;
}
.chart-loading::before,
.table-loading::before {
    content: '';
    width: 32px;
    height: 32px;
    border: 3px solid var(--separator-gray);
    border-top-color: var(--primary-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 12px;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}
.chart-error,
.empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 180px;
    padding: 24px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 14px;
    background: var(--surface-secondary);
    border-radius: 12px;
    border: 1px dashed var(--separator-gray);
}
.chart-error {
    color: var(--accent-red);
}
.data-table .empty-state {
    min-height: auto;
    grid-column: 1 / -1;
}
.data-table td.empty-state {
    border-bottom: none;
}
.th-sort-asc::after { content: ' \2191'; font-size: 12px; color: var(--primary-blue); }
.th-sort-desc::after { content: ' \2193'; font-size: 12px; color: var(--primary-blue); }