/* GLOBAL SETTINGS & THEME VARIABLES */
:root {
    /* Brand Colors */
    --primary: #e53e3e;
    --primary-hover: #c53030;
    
    /* Light Mode Variables (Default) */
    --bg-page: #ffffff;
    --bg-sidebar: #ffffff;
    --bg-zone: #f8f9fa;
    --card-bg: #ffffff;
    --text-main: #1a202c;
    --text-muted: #4a5568;
    --border-color: #edf2f7;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    /* Dark Mode Variables */
    --bg-page: #1a202c;
    --bg-sidebar: #2d3748;
    --bg-zone: #111827;
    --card-bg: #2d3748;
    --text-main: #f7fafc;
    --text-muted: #a0aec0;
    --border-color: #4a5568;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }

body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    background-color: var(--bg-page);
    color: var(--text-main);
    transition: background-color 0.3s, color 0.3s; /* Smooth transition */
}

.hidden { display: none !important; }

/* NAVBAR */
.navbar {
    display: flex;
    align-items: center;
    padding: 0 50px;
    height: 75px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-page);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s, border-color 0.3s;
}

.logo { 
    font-weight: 800; 
    font-size: 26px; 
    text-decoration: none; 
    color: var(--text-main); 
    letter-spacing: -1px; 
}

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

.back-arrow {
    text-decoration: none;
    font-size: 24px;
    color: var(--text-muted);
    margin-right: 20px;
    transition: 0.2s;
}

.back-arrow:hover { color: var(--primary); }

/* THEME TOGGLE BUTTON */
.theme-toggle {
    margin-left: auto;
    background: var(--bg-zone);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 8px 16px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    border-color: var(--primary);
    background: var(--bg-sidebar);
}