/* 1. VARIABLE DEFINITIONS */
:root {
    /* Dark Theme (Default) */
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --nav-bg: rgba(15, 23, 42, 0.9);
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
    --text-muted: #64748b;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --border: #334155;
    --input-bg: #1e293b;
    --danger: #ef4444;
}

body.light-mode {
    /* Light Theme Overrides */
    --bg-main: #f1f5f9;
    --bg-card: #ffffff;
    --nav-bg: rgba(255, 255, 255, 0.9);
    --text-main: #0f172a;
    --text-dim: #475569;
    --text-muted: #64748b;
    --accent: #0284c7;
    --accent-hover: #0369a1;
    --border: #cbd5e1;
    --input-bg: #ffffff;
}

/* 2. RESET & GLOBAL STYLES */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, system-ui, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    line-height: 1.5;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* 3. NAVIGATION BAR */
nav {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 8%;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--accent);
    text-decoration: none;
    letter-spacing: -0.025em;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dim);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-links a:hover, 
.nav-links a.active {
    color: var(--accent);
}

/* 4. CONTAINERS & CARDS */
.container {
    background: var(--bg-card);
    padding: 3rem;
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    max-width: 900px;
    width: 95%;
    margin: 60px 0;
}

/* Notice Board Cards */
.post-card {
    background: var(--bg-card) !important;
    border: 1px solid var(--border);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    position: relative;
    color: var(--text-main);
}

/* Urgent Post Logic */
.post-card.urgent-card {
    border: 2px solid var(--danger) !important;
}

body.light-mode .urgent-card {
    background: #fff5f5 !important; /* Soft red for light mode */
}

body:not(.light-mode) .urgent-card {
    background: #2d1a1a !important; /* Deep red for dark mode */
}

.post-title { color: var(--accent); font-size: 1.4rem; font-weight: bold; margin-bottom: 10px; }
.post-date { font-size: 0.8rem; color: var(--text-dim); margin-bottom: 15px; }
.post-content { line-height: 1.6; color: var(--text-main); white-space: pre-wrap; }

/* 5. FORMS & INPUTS */
.form-group { display: flex; flex-direction: column; gap: 0.5rem; }
.form-group.full-width { grid-column: span 2; }

label { 
    font-size: 0.875rem; 
    font-weight: 600;
    color: var(--text-dim); 
}

input, textarea, select, .pass-input {
    background: var(--input-bg) !important;
    border: 1px solid var(--border);
    color: var(--text-main) !important;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

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

/* Admin Post Box */
.admin-post-box {
    background: var(--bg-card);
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 40px;
    border: 2px dashed var(--accent);
}

/* 6. BUTTONS */
.btn {
    background: var(--accent);
    color: #ffffff;
    padding: 0.8rem 2rem;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}

.btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.delete-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--danger);
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
}

/* 7. PROFILE DASHBOARD SPECIFICS */
.staff-info-value {
    background: var(--bg-main);
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid var(--border);
    color: var(--text-main);
    font-size: 1.05rem;
}

.logout-link {
    display: inline-block;
    margin-top: 2rem;
    color: var(--danger);
    text-decoration: none;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid transparent;
    transition: 0.2s;
}

.logout-link:hover {
    border-color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

/* 8. RESPONSIVE DESIGN */
@media (max-width: 768px) {
    nav { padding: 1rem 5%; }
    .grid-form { grid-template-columns: 1fr; }
    .form-group.full-width { grid-column: span 1; }
    .container { padding: 2rem; }
}