:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --accent-color: #38bdf8;
    --accent-hover: #0ea5e9;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --success-color: #10b981;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background-color: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(8px);
    z-index: 100;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    text-decoration: none;
}

nav a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: clamp(2rem);
    transition: color 0.2s;
}

nav a:hover {
    color: var(--accent-color);
}

section {
    padding: 0rem 5% 0rem;
    max-width: 1200px;
    margin: 0 auto;
}

.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding-top: 7rem;
    max-width: 900px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    letter-spacing: -0.025em;
    line-height: 1.2;
}

.hero h1 span {
    color: var(--accent-color);
}

.hero p {
    color: var(--text-muted);
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
}

.tracker-container {
    width: 100%;
    max-width: 600px;
    margin-bottom: 2rem;
}

.tracker-box {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 0.75rem;
    display: flex;
    gap: 0.5rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

.tracker-box input {
    flex: 1;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    color: var(--text-main);
    outline: none;
}

.tracker-box input:focus {
    border-color: var(--accent-color);
}

.tracker-box button {
    background-color: var(--accent-color);
    color: var(--bg-color);
    border: none;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.tracker-box button:hover {
    background-color: var(--accent-hover);
}

.tracker-result {
    margin-top: 1rem;
    padding: 1.25rem;
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success-color);
    border-radius: 0.5rem;
    display: none;
    color: var(--text-main);
    text-align: left;
    font-size: 0.95rem;
}

.section-title {
    text-align: center;
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 3.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 2.5rem 2rem;
    border-radius: 0.75rem;
    transition: transform 0.2s, border-color 0.2s;
}

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

.card h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
    color: var(--accent-color);
}

.card p {
    color: var(--text-muted);
    font-size: clamp(0.95rem);
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 3rem;
    border-radius: 1rem;
}

@media (max-width: 768px) {
    .contact-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .hero h1 { font-size: 2.5rem; }
}

.contact-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.contact-info p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.form-group input, .form-group textarea {
    width: 100%;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    border-radius: 0.5rem;
    color: var(--text-main);
    outline: none;
}

.form-group input:focus, .form-group textarea:focus {
    border-color: var(--accent-color);
}

.submit-btn {
    background-color: transparent;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    padding: 0.75rem 2rem;
    font-weight: 600;
    border-radius: 0.5rem;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.2s, color 0.2s;
}

.submit-btn:hover {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

footer {
    text-align: center;
    padding: 3rem 5%;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.card {
    cursor: pointer;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.expand-icon {
    font-size: 1.5rem;
    color: var(--accent-color);
    transition: transform 0.3s ease;
    font-weight: bold;
}

/* Hidden container state */
.card-details {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0, 1, 0, 1), opacity 0.3s ease, margin-top 0.3s ease;
}

/* Sub-list styling inside expansion */
.card-details h4 {
    color: var(--text-main);
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.card-details ul {
    list-style-type: none;
    padding-left: 0.5rem;
}

.card-details li {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1.2rem;
}

.card-details li::before {
    content: "↪";
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* Active class applied by JavaScript */
.card.active {
    border-color: var(--accent-color);
}

.card.active .expand-icon {
    transform: rotate(45deg); /* Turns the '+' into an 'x' */
}

.card.active .card-details {
    max-height: 500px; /* Large enough value to clear content height */
    opacity: 1;
    /*margin-top: 1.5rem;*/
    /*padding-top: 1rem;
    border-top: 1px dashed var(--border-color);*/
    transition: max-height 0.4s cubic-bezier(0.99, 0.01, 0.45, 1), opacity 0.4s ease, margin-top 0.3s ease;
}


/* Tab Navigation Container Styles */
.tab-container {
    margin-top: 1rem;
    text-align: left;
}

.tab-headers {
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    border-radius: 0.25rem;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--accent-color);
    background-color: rgba(56, 189, 248, 0.05);
}

.tab-btn.active {
    color: var(--bg-color);
    background-color: var(--accent-color);
}

/* Typography control for heavy text blocks */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.wall-of-text {
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-muted);
    text-align: justify;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(2px); }
    to { opacity: 1; transform: translateY(0); }
}



/* Asymmetric Layout Adjustments */
@media (min-width: 992px) {
    .grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    /* Forces the heavy-text card to take up 2/3rds of the desktop width layout */
    .featured-card {
        grid-column: span 2;
    }
}

/* Internal Layout for the Dense Text Window */
.dense-text-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    text-align: left;
}

.text-column p {
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.text-column h4 {
    color: var(--text-main);
    font-size: 1.05rem;
    margin-bottom: 0.75rem;
}

/* Optional styling side-panel within the heavy card to split up technical metrics */
.highlight-box {
    background-color: rgba(56, 189, 248, 0.03);
    border: 1px dashed var(--border-color);
    padding: 1.5rem;
    border-radius: 0.5rem;
}

/* Adjust max-height limit on expansion for the larger content size block */
.featured-card.active .card-details {
    max-height: 800px; 
}





/* Add or replace these rules in your style.css file */

@media (min-width: 768px) {
    /* Setup a multi-column row framework */
    .grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    
    /* Forces Card 1 to stretch 100% across the container row width */
    .full-width-card {
        grid-column: span 2;
    }
}

/* Widescreen 3-Column Internal Layout for Massive Text */
.widescreen-text-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
    text-align: left;
    margin-top: 1rem;
}

.text-column h4 {
    color: var(--accent-color);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.text-column p {
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-muted);
}

/* Optional styling tint for the final column to act as a summary checklist */
.highlight-column {
    background-color: rgba(56, 189, 248, 0.02);
    border: 1px dashed var(--border-color);
    padding: 1.25rem;
    border-radius: 0.5rem;
}

/* Adjust layout threshold for heavy row expanded mechanics */
.full-width-card.active .card-details {
    max-height: 1200px;
}


/* Widescreen Multi-Column Grid Configuration */
@media (min-width: 768px) {
    .grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
    
    .full-width-card {
        grid-column: span 2;
    }
}

/* Tab Navigation Architecture */
.tab-container {
    margin-top: 1rem;
    text-align: left;
}

.tab-headers {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.6rem 1.2rem;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    border-radius: 0.375rem;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--accent-color);
    background-color: rgba(56, 189, 248, 0.05);
}

.tab-btn.active {
    color: var(--bg-color);
    background-color: var(--accent-color);
}

/* Widescreen 3-Column Content Flow */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: textFadeIn 0.3s ease;
}

.widescreen-column-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2rem;
}

.text-column h4 {
    color: var(--text-main);
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px dashed var(--border-color);
    padding-bottom: 0.5rem;
}

.text-column p {
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--text-muted);
}

.highlight-column {
    background-color: rgba(56, 189, 248, 0.02);
    border: 1px dashed var(--border-color);
    padding: 1.25rem;
    border-radius: 0.5rem;
}

.full-width-card.active .card-details {
    max-height: 1400px; /* Safe upper clearance ceiling for massive text sizes */
}

@keyframes textFadeIn {
    from { opacity: 0; transform: translateY(3px); }
    to { opacity: 1; transform: translateY(0); }
}




/* Section Group Styles */
.category-group {
    margin-bottom: 5rem;
    text-align: left;
}

.category-heading {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.5rem;
    /*border-bottom: 1px solid var(--border-color);*/
    padding-bottom: 0.75rem;
}

.category-heading span {
    color: var(--accent-color);
    font-family: monospace;
    font-size: 1.25rem;
}

.category-description {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 2rem;
    max-width: 700px;
}

/* Framework Layout For Standard Elements */
@media (min-width: 768px) {
    .grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
}

.full-width-card {
    width: 100%;
}

.card-summary {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 0.5rem;
}

/* Keep tab container text aligned inside full layout box */
.tab-container {
    margin-top: 1.5rem;
}


/* Connected Flow Architecture */
.ecosystem-flow {
    position: relative;
    max-width: 1000px;
    margin: 4rem auto 0;
    padding-left: 2.5rem;
}

/* The vertical connector spine */
.ecosystem-flow::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 15px;
    bottom: 40px;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-color), var(--border-color) 70%, transparent);
}

.flow-step {
    position: relative;
    margin-bottom: 5rem;
}

/* Glowing dot marker indicating step points */
.flow-marker {
    position: absolute;
    left: -2.5rem;
    top: 8px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--bg-color);
    border: 3px solid var(--accent-color);
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
    z-index: 2;
}

.flow-content {
    text-align: left;
}

/* Softened Heading Frameworks */
.category-heading {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.category-description {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    max-width: 750px;
    line-height: 1.6;
}

/* Layout Engine Sync */
@media (min-width: 768px) {
    .grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
}

.full-width-card {
    width: 100%;
}

.card-summary {
    color: var(--text-muted);
    font-size: clamp(0.9rem);
    margin-top: 0.5rem;
}

/* TODO: cleanup any orphan classes from above

/* Contact form validation */
.invalid-feedback,
.empty-feedback {
  display: none;
}

.was-validated :placeholder-shown:invalid ~ .empty-feedback {
  display: block;
}

.was-validated :not(:placeholder-shown):invalid ~ .invalid-feedback {
  display: block;
}

.is-invalid,
.was-validated :invalid {
  border-color: #dc3545;
}


main {margin-top: 0px;}

/* --- Header Layout --- */
header {
  position: fixed; /* Keeps the entire nav bar at the top while scrolling */
  top: 0;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: space-between; /* Pushes logo to left, nav links to right */
  align-items: center;
  padding: 25px 5%; /* Adjusts side spacing */
  z-index: 1000;
  box-sizing: border-box;
}

/* --- Logo Styling --- */
.logo-container {
  display: flex;
  align-items: center;
}

.responsive-logo {
  width: 200px; /* Targets your desired 200px width */
  max-width: 100%;
  height: auto; /* Scales proportionally */
  display: block;
}

/* --- Navigation Links (Desktop) --- */
nav {
  display: flex;
  gap: 20px; /* Spacing between your menu items */
}

/* --- Mobile View (Screens smaller than 768px) --- */
@media screen and (max-width: 1024px) {
  h1 { font-size: 3.5rem; }
  p { font-size: 1.15rem; }	
	
  header {
    flex-direction: column; /* Stacks the logo above the navigation links */
    gap: 15px;
    padding: 15px 2%;
  }
  
.hero {margin-top: 40px;}

  .logo-container {
    width: 100%;
    justify-content: center; /* Centers the logo horizontally on mobile */
  }

  .responsive-logo {
    width: 180px; /* Slightly smaller scale for mobile screens */
  }

  nav {
    width: 100%;
    justify-content: center; /* Centers the navigation links below the logo */
    flex-wrap: wrap; /* Allows links to wrap to a new line if screen is narrow */
    gap: 15px;
  }
}