/* ===== Photo Challenge — Global Styles ===== */

:root, .theme-classic {
    --color-primary: #C47A3A;
    --color-primary-light: #D4956A;
    --color-primary-dark: #A8632E;
    --color-secondary: #D4C4A8;
    --color-dark: #3D2B1F;
    --color-light: #F5EDE4;
    --color-bg: #FAF6F1;
    --color-accent: #B8973A;
    --color-text: #2C1810;
    --color-text-muted: #7A6558;
    --color-border: #E0D5C8;
    --color-success: #5B8A5E;
    --color-error: #C4534A;
    --color-white: #FFFFFF;
    --color-card: #FFFFFF;

    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --shadow-sm: 0 1px 3px rgba(61, 43, 31, 0.06);
    --shadow-md: 0 4px 16px rgba(61, 43, 31, 0.08);
    --shadow-lg: 0 8px 32px rgba(61, 43, 31, 0.1);
    --shadow-xl: 0 16px 48px rgba(61, 43, 31, 0.12);
}

/* ===== Color Themes ===== */
.theme-sage {
    --color-primary: #7A9E7E;
    --color-primary-light: #9DB8A0;
    --color-primary-dark: #5C7E60;
    --color-secondary: #C8D5C4;
    --color-dark: #2A3B2C;
    --color-light: #EDF2ED;
    --color-bg: #F7FAF7;
    --color-accent: #8B7355;
    --color-text: #1E2A1F;
    --color-text-muted: #5A6B5C;
    --color-border: #D0DCC9;
}

.theme-rose {
    --color-primary: #C48A8A;
    --color-primary-light: #D9A8A8;
    --color-primary-dark: #A66E6E;
    --color-secondary: #E8D0D0;
    --color-dark: #3D2B2B;
    --color-light: #F8EFEF;
    --color-bg: #FDF8F8;
    --color-accent: #9E7A5B;
    --color-text: #2C1818;
    --color-text-muted: #7A5858;
    --color-border: #E5D0D0;
}

.theme-navy {
    --color-primary: #4A5E7A;
    --color-primary-light: #6B82A0;
    --color-primary-dark: #364860;
    --color-secondary: #C4CED8;
    --color-dark: #1E2A3D;
    --color-light: #EDF0F5;
    --color-bg: #F5F7FA;
    --color-accent: #B8973A;
    --color-text: #1A2030;
    --color-text-muted: #5A6878;
    --color-border: #CDD5E0;
}

.theme-lavender {
    --color-primary: #8B7AAE;
    --color-primary-light: #A899C4;
    --color-primary-dark: #6E5F90;
    --color-secondary: #D4CCE0;
    --color-dark: #2E2540;
    --color-light: #F0ECF5;
    --color-bg: #F8F6FB;
    --color-accent: #9E8B6E;
    --color-text: #201830;
    --color-text-muted: #685A7A;
    --color-border: #D8D0E5;
}

.theme-terracotta {
    --color-primary: #B86F50;
    --color-primary-light: #D08A6A;
    --color-primary-dark: #964D34;
    --color-secondary: #D4BBA8;
    --color-dark: #3D2518;
    --color-light: #F5ECE4;
    --color-bg: #FBF5EF;
    --color-accent: #8B7A3A;
    --color-text: #2C1A10;
    --color-text-muted: #7A5848;
    --color-border: #E0CFC0;
}

.theme-forest {
    --color-primary: #4A7A5E;
    --color-primary-light: #6A9E7E;
    --color-primary-dark: #2E5E42;
    --color-secondary: #B8CCBE;
    --color-dark: #1A2E20;
    --color-light: #E8F0EA;
    --color-bg: #F4F8F5;
    --color-accent: #A88E5A;
    --color-text: #142018;
    --color-text-muted: #4A6050;
    --color-border: #C4D4C8;
}

.theme-midnight {
    --color-primary: #B8973A;
    --color-primary-light: #D0AE58;
    --color-primary-dark: #9A7E28;
    --color-secondary: #3A3A3A;
    --color-dark: #F0E8D8;
    --color-light: #2A2A2A;
    --color-bg: #1A1A1A;
    --color-accent: #C4A050;
    --color-text: #E8E0D0;
    --color-text-muted: #9A9080;
    --color-border: #3A3530;
    --color-white: #242424;
    --color-card: #242424;
}

/* ===== Reset & Base ===== */

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    min-height: 100dvh;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
}

a {
    color: var(--color-primary-dark);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

button, .btn {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    border-radius: var(--radius-md);
    padding: 12px 24px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
    text-decoration: none;
    line-height: 1;
    letter-spacing: 0.01em;
}

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

.btn-primary {
    background: var(--color-primary);
    color: #FFFFFF;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

.btn-secondary {
    background: var(--color-light);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-border);
    text-decoration: none;
}

.btn-large {
    padding: 16px 32px;
    font-size: 1rem;
    border-radius: var(--radius-lg);
}

.btn-block {
    width: 100%;
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: #FFFFFF;
    text-decoration: none;
}

/* ===== Inputs ===== */

input[type="text"], input[type="email"], textarea {
    font-family: var(--font-body);
    font-size: 1rem;
    padding: 12px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-white);
    color: var(--color-text);
    width: 100%;
    transition: border-color 0.2s ease;
}

input[type="text"]:focus, textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* ===== Layout ===== */

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-wide {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-narrow {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 20px;
}

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

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

/* ===== Shared Nav ===== */

.site-nav {
    padding: 14px 0;
    position: sticky;
    top: 0;
    background: rgba(250, 246, 241, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
}

.site-nav .nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.site-nav .nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-decoration: none;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.btn-nav {
    padding: 10px 20px;
    font-size: 0.875rem;
    white-space: nowrap;
}

/* ===== Logo ===== */

.logo {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    font-family: var(--font-display);
    font-weight: 700;
    flex-shrink: 0;
}

.logo:hover { text-decoration: none; }

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.logo-mark {
    font-size: 1.25rem;
    color: var(--color-dark);
    letter-spacing: -0.01em;
}

.logo-mark span {
    color: var(--color-primary);
}

/* ===== Footer ===== */

.site-footer {
    padding: 32px 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 12px;
}

.footer-links a {
    color: var(--color-text-muted);
    font-size: 0.8125rem;
}

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

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

@media (max-width: 768px) {
    h2, h3, h4 {
        font-family: var(--font-body);
        font-weight: 600;
    }

    .site-nav .nav-actions {
        gap: 10px;
    }

    .btn-nav {
        padding: 8px 14px;
        font-size: 0.8125rem;
    }
}