/**
 * Nebula Theme - Base Styles
 * Core styles using Nebula design system
 * Version: 2.0.0
 */

/* ============================
   Reset & Box Sizing
   ============================ */

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

/* ============================
   Body
   ============================ */

body {
    margin: 0;
    padding: 0;
    font-family: var(--nebula-font-sans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif);
    font-size: 1rem;
    line-height: var(--nebula-leading-normal, 1.5);
    color: var(--nebula-text, #1E293B);
    background-color: var(--nebula-bg, #FFFFFF);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================
   Typography
   ============================ */

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 0.5em;
    font-family: var(--nebula-font-heading, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif);
    font-weight: 600;
    line-height: var(--nebula-leading-tight, 1.25);
    color: var(--nebula-secondary, #0F172A);
}

h1 { font-size: var(--nebula-text-4xl, 2.25rem); }
h2 { font-size: var(--nebula-text-3xl, 1.875rem); }
h3 { font-size: var(--nebula-text-2xl, 1.5rem); }
h4 { font-size: var(--nebula-text-xl, 1.25rem); }
h5 { font-size: var(--nebula-text-lg, 1.125rem); }
h6 { font-size: var(--nebula-text-base, 1rem); }

p {
    margin: 0 0 1em;
}

a {
    color: var(--nebula-primary, #0EA5E9);
    text-decoration: none;
    transition: color var(--nebula-duration-fast, 0.15s) var(--nebula-ease-out);
}

a:hover {
    color: var(--nebula-primary-hover, #0284C7);
}

/* ============================
   Container
   ============================ */

.nebula-container,
.container {
    width: 100%;
    max-width: var(--nebula-container-max, 1200px);
    margin: 0 auto;
    padding: 0 var(--nebula-page-padding, 16px);
}

/* ============================
   Cards
   ============================ */

.nebula-card {
    background: var(--nebula-bg, #FFFFFF);
    border-radius: var(--nebula-radius-lg, 12px);
    box-shadow: var(--nebula-shadow-md, 0 4px 6px rgba(0, 0, 0, 0.07));
    overflow: hidden;
    transition: box-shadow var(--nebula-duration-normal, 0.2s) var(--nebula-ease-out),
                transform var(--nebula-duration-normal, 0.2s) var(--nebula-ease-out);
}

.nebula-card:hover {
    box-shadow: var(--nebula-shadow-lg, 0 10px 15px rgba(0, 0, 0, 0.1));
}

.nebula-card-header {
    padding: var(--nebula-space-4, 16px) var(--nebula-space-6, 24px);
    border-bottom: 1px solid var(--nebula-border, #E2E8F0);
}

.nebula-card-body {
    padding: var(--nebula-space-6, 24px);
}

.nebula-card-footer {
    padding: var(--nebula-space-4, 16px) var(--nebula-space-6, 24px);
    border-top: 1px solid var(--nebula-border, #E2E8F0);
    background: var(--nebula-bg-secondary, #F8FAFC);
}

/* ============================
   Buttons
   ============================ */

.nebula-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1;
    border: none;
    border-radius: var(--nebula-radius-md, 8px);
    cursor: pointer;
    transition: all var(--nebula-duration-fast, 0.15s) var(--nebula-ease-out);
}

.nebula-btn-primary {
    background: var(--nebula-primary, #0EA5E9);
    color: #FFFFFF;
}

.nebula-btn-primary:hover {
    background: var(--nebula-primary-hover, #0284C7);
    transform: translateY(-1px);
}

.nebula-btn-secondary {
    background: var(--nebula-secondary, #0F172A);
    color: #FFFFFF;
}

.nebula-btn-secondary:hover {
    background: var(--nebula-secondary-dark, #020617);
}

.nebula-btn-outline {
    background: transparent;
    border: 1px solid var(--nebula-border, #E2E8F0);
    color: var(--nebula-text, #1E293B);
}

.nebula-btn-outline:hover {
    background: var(--nebula-bg-secondary, #F8FAFC);
    border-color: var(--nebula-primary, #0EA5E9);
    color: var(--nebula-primary, #0EA5E9);
}

/* ============================
   Forms
   ============================ */

input[type="text"],
input[type="email"],
input[type="url"],
input[type="password"],
input[type="search"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 10px 14px;
    font-size: 0.875rem;
    font-family: inherit;
    line-height: 1.5;
    color: var(--nebula-text, #1E293B);
    background: var(--nebula-bg, #FFFFFF);
    border: 1px solid var(--nebula-border, #E2E8F0);
    border-radius: var(--nebula-radius-md, 8px);
    transition: border-color var(--nebula-duration-fast, 0.15s),
                box-shadow var(--nebula-duration-fast, 0.15s);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--nebula-primary, #0EA5E9);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
}

/* ============================
   Tags
   ============================ */

.nebula-tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--nebula-text-secondary, #64748B);
    background: var(--nebula-bg-secondary, #F8FAFC);
    border-radius: var(--nebula-radius-full, 9999px);
    transition: all var(--nebula-duration-fast, 0.15s);
}

.nebula-tag:hover {
    background: var(--nebula-primary-light, #E0F2FE);
    color: var(--nebula-primary, #0EA5E9);
}

.nebula-tag-primary {
    background: var(--nebula-primary-light, #E0F2FE);
    color: var(--nebula-primary, #0EA5E9);
}

.nebula-tag-accent {
    background: var(--nebula-accent-light, #FEF3C7);
    color: var(--nebula-accent-dark, #D97706);
}

/* ============================
   Utilities
   ============================ */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--nebula-primary, #0EA5E9); }
.text-secondary { color: var(--nebula-text-secondary, #64748B); }
.text-muted { color: var(--nebula-text-muted, #94A3B8); }

.bg-primary { background-color: var(--nebula-primary, #0EA5E9); }
.bg-secondary { background-color: var(--nebula-bg-secondary, #F8FAFC); }

.rounded { border-radius: var(--nebula-radius-md, 8px); }
.rounded-lg { border-radius: var(--nebula-radius-lg, 12px); }
.shadow { box-shadow: var(--nebula-shadow-md, 0 4px 6px rgba(0, 0, 0, 0.07)); }
.shadow-lg { box-shadow: var(--nebula-shadow-lg, 0 10px 15px rgba(0, 0, 0, 0.1); }

/* ============================
   Dark Mode Support
   ============================ */

@media (prefers-color-scheme: dark) {
    :root {
        --nebula-bg: #0F172A;
        --nebula-bg-secondary: #1E293B;
        --nebula-bg-tertiary: #334155;
        --nebula-text: #F1F5F9;
        --nebula-text-secondary: #94A3B8;
        --nebula-text-muted: #64748B;
        --nebula-border: #334155;
    }
}