:root {
    --bg-color: #0b0f19; /* Deep dark blue/black */
    --surface-color: #151b2b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #0ea5e9; /* Electric Blue */
    --accent-hover: #38bdf8;
    --border-color: #1e293b;
    --spacing-unit: 1.5rem;
    --container-width: 1200px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
        sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1,
h2,
h3,
h4 {
    line-height: 1.2;
    margin-bottom: 1rem;
    font-weight: 700;
}

h1 {
    font-size: 3rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.25rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    max-width: 65ch;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Lists (General) */
ul {
    margin-bottom: 1rem;
    padding-left: 2rem;
    color: var(--text-secondary);
}

li {
    margin-bottom: 0.5rem;
}

/* Layout */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
}

.container-narrow {
    max-width: 800px;
}

section {
    padding: 5rem 0;
    border-bottom: 1px solid var(--border-color);
}

section:last-of-type {
    border-bottom: none;
}

/* Components */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

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

.grid {
    display: grid;
    gap: 2rem;
}

@media (min-width: 768px) {
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    h1 {
        font-size: 4rem;
    }
}

/* Header / Nav */
header {
    padding: 2rem 0;
    position: sticky;
    top: 0;
    background-color: rgba(11, 15, 25, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-primary);
    letter-spacing: -0.03em;
}

.logo img {
    height: 2.5rem; /* Match nav button scale */
    width: auto; /* Maintains aspect ratio */
    max-width: 200px; /* Prevents it from getting too wide */
    display: block;
}

/* Hero */
.hero {
    padding: 8rem 0 6rem;
    text-align: center;
}

.hero h1 {
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    margin: 0 auto 2.5rem;
    font-size: 1.25rem;
}

.hero-logo {
    max-width: 200px;
    height: auto;
    margin: 2rem auto;
    display: block;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Features/Problem */
.feature-card {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

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

/* Approach */
.approach-list {
    list-style: none;
    padding-left: 0; /* Reset general ul padding for this component */
}
.approach-list li {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
    position: relative;
    font-size: 1.2rem;
    color: var(--text-primary);
}
.approach-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* Forms */
.form-box {
    background: var(--surface-color);
    padding: 2.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    max-width: 600px;
    margin: 0 auto;
}

.input-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

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

input,
textarea,
select {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

/* Footer */
footer {
    padding: 4rem 0;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

/* Status Messages */
.status-message {
    margin-top: 1rem;
    font-size: 0.9rem;
    display: none;
}
.status-message.success {
    color: #4ade80;
    display: block;
}
.status-message.error {
    color: #f87171;
    display: block;
}

/* Utilities */
.back-link {
    display: inline-block;
    margin-top: 4rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}