/* ==========================================================================
   DESIGN SYSTEM & VARIABLES
   ========================================================================== */
:root {
    /* Color Palette - HSL Slate & Neon Gradient Accents */
    --bg-base: hsl(222, 47%, 4%);
    --bg-surface: rgba(15, 23, 42, 0.45);
    --bg-surface-hover: rgba(30, 41, 59, 0.6);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-glow: rgba(56, 189, 248, 0.4);
    
    --text-primary: hsl(210, 40%, 98%);
    --text-secondary: hsl(215, 20%, 65%);
    --text-muted: hsl(215, 16%, 47%);
    
    --accent-blue: hsl(199, 89%, 48%);
    --accent-emerald: hsl(150, 84%, 53%);
    --accent-gradient: linear-gradient(135deg, var(--accent-blue), var(--accent-emerald));
    
    /* Typography */
    --font-primary: 'Outfit', sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
    
    /* Transitions */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   RESET & GLOBAL STYLES
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* Canvas Background */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* Scrollbar customization */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(56, 189, 248, 0.3);
}

/* ==========================================================================
   LAYOUT UTILITIES
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 64px auto;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff, var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: clamp(1rem, 2vw, 1.125rem);
}

/* ==========================================================================
   BUTTONS & FORM CONTROLS
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-primary);
    font-size: 0.95rem;
    font-weight: 600;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition-smooth);
    border: none;
    gap: 8px;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent-gradient);
    color: hsl(222, 47%, 4%);
    box-shadow: 0 4px 20px rgba(56, 189, 248, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(56, 189, 248, 0.4);
    filter: brightness(1.1);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.05rem;
    border-radius: 10px;
}

.btn-icon {
    width: 18px;
    height: 18px;
}

/* ==========================================================================
   NAVIGATION HEADER
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background: rgba(10, 15, 30, 0.5);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
}

.pulse-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    background-color: var(--accent-emerald);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-emerald);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 6px rgba(16, 185, 129, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
    }
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: var(--transition-fast);
}

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

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

.nav-actions {
    display: flex;
    gap: 16px;
}

/* Mobile Nav Styles */
.mobile-nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 110;
}

.mobile-nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-smooth);
}

.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(10, 15, 30, 0.95);
    backdrop-filter: blur(20px);
    z-index: 90;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.77, 0, 0.175, 1);
}

.mobile-overlay.active {
    transform: translateX(0);
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
}

.mobile-nav-links a {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
}

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

.mobile-nav-actions {
    display: flex;
    flex-direction: column;
    gap: 16px;
    width: 250px;
    margin-top: 16px;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 120px;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.badge-tag {
    display: inline-flex;
    align-items: center;
    background: rgba(56, 189, 248, 0.08);
    border: 1px solid rgba(56, 189, 248, 0.15);
    color: #38bdf8;
    padding: 8px 16px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 24px;
    gap: 8px;
}

.badge-glow {
    width: 6px;
    height: 6px;
    background: #38bdf8;
    border-radius: 50%;
    box-shadow: 0 0 8px #38bdf8;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6.5vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 40px auto;
    font-weight: 400;
}

.highlight-name {
    color: var(--text-primary);
    font-weight: 600;
}

.hero-ctas {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* ==========================================================================
   STATS SECTION
   ========================================================================== */
.stats-section {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.01);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    text-align: center;
}

.stat-card {
    padding: 16px;
}

.stat-num {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 8px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

/* ==========================================================================
   SERVICES SECTION
   ========================================================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.service-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px 32px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(56, 189, 248, 0.03) 0%, rgba(56, 189, 248, 0) 100%);
    opacity: 0;
    transition: var(--transition-smooth);
}

.service-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-color-glow);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3), 0 0 20px rgba(56, 189, 248, 0.08);
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon-wrapper {
    width: 54px;
    height: 54px;
    border-radius: 12px;
    background: rgba(56, 189, 248, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-blue);
    margin-bottom: 24px;
    border: 1px solid rgba(56, 189, 248, 0.15);
    transition: var(--transition-smooth);
}

.service-card:hover .service-icon-wrapper {
    background: var(--accent-gradient);
    color: hsl(222, 47%, 4%);
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.3);
}

.service-icon {
    width: 24px;
    height: 24px;
}

.service-title {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.service-list {
    list-style: none;
}

.service-list li {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 10px;
    padding-left: 20px;
    position: relative;
}

.service-list li::before {
    content: "•";
    color: var(--accent-emerald);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* ==========================================================================
   SKILLS SECTION
   ========================================================================== */
.skills-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 48px;
}

.filter-btn {
    font-family: var(--font-primary);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 10px 20px;
    border-radius: 100px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.filter-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.filter-btn.active {
    background: var(--accent-gradient);
    color: hsl(222, 47%, 4%);
    border-color: transparent;
    font-weight: 600;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 20px;
}

.skill-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px 16px;
    text-align: center;
    backdrop-filter: blur(8px);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 110px;
}

.skill-card:hover {
    border-color: rgba(16, 185, 129, 0.3);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2), 0 0 10px rgba(16, 185, 129, 0.05);
    transform: translateY(-4px);
}

.skill-name {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.skill-category-tag {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

/* Filter Hide/Show transitions */
.skill-card.filtered-out {
    display: none;
}

/* ==========================================================================
   ESTIMATOR SECTION
   ========================================================================== */
.estimator-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 32px;
    align-items: start;
}

.estimator-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    backdrop-filter: blur(12px);
}

.estimator-card-title {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.estimator-group {
    margin-bottom: 24px;
}

.estimator-group:last-child {
    margin-bottom: 0;
}

.group-title {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

/* Custom Checkbox Design */
.checkbox-container {
    display: flex;
    align-items: center;
    position: relative;
    padding-left: 36px;
    margin-bottom: 12px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-secondary);
    user-select: none;
    transition: var(--transition-fast);
}

.checkbox-container:hover {
    color: var(--text-primary);
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.custom-checkmark {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 20px;
    width: 20px;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: var(--transition-fast);
}

.checkbox-container:hover input ~ .custom-checkmark {
    border-color: rgba(255, 255, 255, 0.2);
}

.checkbox-container input:checked ~ .custom-checkmark {
    background: var(--accent-gradient);
    border-color: transparent;
}

.custom-checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked ~ .custom-checkmark:after {
    display: block;
}

.checkbox-container .custom-checkmark:after {
    left: 7px;
    top: 3px;
    width: 5px;
    height: 10px;
    border: solid hsl(222, 47%, 4%);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Right Side: Results Card styling */
.results-card {
    border-color: rgba(56, 189, 248, 0.2);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.results-display {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.metric-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    padding: 16px;
    border-radius: 10px;
}

.metric-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}

.metric-value {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
}

.selected-services-summary {
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 24px;
    min-height: 120px;
    max-height: 200px;
    overflow-y: auto;
}

.summary-title {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 600;
}

.summary-list {
    list-style: none;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.summary-list li {
    margin-bottom: 6px;
    padding-left: 14px;
    position: relative;
}

.summary-list li::before {
    content: "•";
    color: var(--accent-blue);
    position: absolute;
    left: 0;
}

.empty-list-msg {
    color: var(--text-muted);
    font-style: italic;
    padding-left: 0 !important;
}

.empty-list-msg::before {
    display: none !important;
}

.estimator-ctas {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: start;
}

.contact-info .section-title {
    text-align: left;
    margin-bottom: 24px;
}

.contact-lead {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-detail-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.detail-icon-wrapper {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-blue);
    flex-shrink: 0;
}

.detail-content {
    display: flex;
    flex-direction: column;
}

.detail-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.detail-value {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
}

.detail-value:hover {
    color: var(--accent-emerald);
}

/* Contact Form UI */
.contact-form-wrapper {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    backdrop-filter: blur(12px);
}

.form-title {
    font-family: var(--font-display);
    font-size: 1.35rem;
    margin-bottom: 24px;
    font-weight: 700;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-blue);
    background: rgba(255, 255, 255, 0.04);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.1);
}

/* Custom form states */
.form-input:user-valid {
    border-color: var(--accent-emerald);
}

.form-textarea {
    height: 120px;
    resize: none;
}

.form-feedback {
    font-size: 0.85rem;
    margin-bottom: 16px;
    display: none;
}

.form-feedback.success {
    display: block;
    color: var(--accent-emerald);
}

.form-feedback.error {
    display: block;
    color: #ef4444;
}

/* ==========================================================================
   FOOTER SECTION
   ========================================================================== */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    background: rgba(10, 15, 30, 0.8);
}

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

.copyright {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.location-tag {
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.loc-dot {
    width: 6px;
    height: 6px;
    background-color: #f43f5e;
    border-radius: 50%;
    box-shadow: 0 0 8px #f43f5e;
}

/* ==========================================================================
   ANIMATIONS & MOTION
   ========================================================================== */
/* Scroll reveal base */
.scroll-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.scroll-reveal.reveal-active {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   MEDIA QUERIES (RESPONSIVENESS)
   ========================================================================== */
@media (max-width: 992px) {
    section {
        padding: 80px 0;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .estimator-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links, .nav-actions {
        display: none;
    }
    
    .mobile-nav-toggle {
        display: flex;
    }
    
    .hero-section {
        padding-top: 140px;
    }
    
    .hero-ctas {
        flex-direction: column;
        gap: 12px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .contact-form-wrapper {
        padding: 30px 20px;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}