@import url('https://fonts.googleapis.com/css2?family=Caveat:wght@700&display=swap');

:root {
    /* Color Palette */
    --color-bg: #ffffff;
    --color-surface: #f8fafc;
    --color-primary: #0f766e;
    --color-primary-hover: #115e59;
    --color-primary-soft: #f0fdfa; /* Very light teal */
    --color-text-main: #0f172a;
    --color-text-muted: #475569; /* Slightly darker for better contrast */
    --color-border-subtle: #e2e8f0;

    /* Typography scale */
    --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-brand: 'Caveat', cursive;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text-main);
    font-family: var(--font-sans);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Global Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-main);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.025em; /* Tight tracking for headings */
}

h1 { font-size: 2.25rem; } /* Mobile default */
@media (min-width: 768px) { h1 { font-size: 3rem; } }
@media (min-width: 1024px) { h1 { font-size: 3.75rem; } }

h2 { font-size: 1.875rem; }
@media (min-width: 768px) { h2 { font-size: 2.25rem; } }

h3 { font-size: 1.25rem; }
@media (min-width: 768px) { h3 { font-size: 1.5rem; } }

p {
    margin-bottom: 1rem;
}

/* Brand Font */
.font-brand {
    font-family: var(--font-brand);
    letter-spacing: 0.1em;
    font-size: 1.75rem;
}

/* Links */
a {
    color: var(--color-primary);
    transition: color 0.2s ease;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

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

a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Buttons */
.btn-primary {
    background-color: var(--color-primary);
    color: white !important;
    padding: 0.625rem 1.25rem; /* Slightly smaller padding */
    border-radius: 0.5rem; /* 8px - modern, not full pill */
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px rgba(15, 118, 110, 0.2), 0 2px 4px -1px rgba(15, 118, 110, 0.1);
}

.btn-primary:focus-visible {
    outline: 2px solid var(--color-primary-hover);
    outline-offset: 2px;
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary) !important;
    border: 1px solid var(--color-border-subtle); /* Thinner, lighter border */
    padding: 0.625rem 1.25rem;
    border-radius: 0.5rem;
    font-weight: 500; /* Slightly lighter weight */
    font-size: 1rem;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-soft);
    color: var(--color-primary-hover) !important;
}

.btn-secondary:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Cards */
.card-simple {
    background-color: white;
    border: 1px solid var(--color-border-subtle);
    border-radius: 0.75rem; /* 12px */
    padding: 1.5rem;
    transition: all 0.2s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card-simple:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
    border-color: var(--color-primary-hover); /* Subtle highlight */
}

/* Icons within cards */
.icon-circle {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 0.5rem; /* Rounded square instead of circle for modern look */
    background-color: var(--color-primary-soft);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
}

/* Section styling */
.section-heading {
    color: var(--color-text-main);
    font-weight: 800;
    margin-bottom: 0.75rem;
    letter-spacing: -0.025em;
}

.section-subtext {
    color: var(--color-text-muted);
    font-size: 1.125rem;
    line-height: 1.6;
    max-width: 42rem;
}

/* Tab Styling - Modern */
.tab-btn {
    position: relative;
    padding: 0.5rem 1rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color 0.2s ease;
}

.tab-btn.active {
    color: var(--color-primary);
    font-weight: 600;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
}

/* Navbar */
nav {
    border-bottom: 1px solid var(--color-border-subtle);
}

/* Dark mode overrides */
.dark body {
    background-color: #0f172a; /* Slate 900 */
    --color-bg: #0f172a;
    --color-surface: #1e293b; /* Slate 800 */
    --color-text-main: #f8fafc;
    --color-text-muted: #94a3b8;
    --color-border-subtle: #334155;
    --color-primary-soft: rgba(15, 118, 110, 0.2);
    --color-primary-hover: #2dd4bf; /* Lighter teal for dark mode */
}

.dark .card-simple {
    background-color: var(--color-surface);
    border-color: var(--color-border-subtle);
}

.dark .btn-secondary {
    border-color: var(--color-border-subtle);
    color: #cbd5e1 !important;
}

.dark .btn-secondary:hover {
    border-color: var(--color-primary-hover);
    color: var(--color-primary-hover) !important;
}