@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

:root {
    /* Brand Colors */
    --primary: #635BDB;
    --primary-hover: #5145CD;
    --light-lavender: #F0EEFF;
    
    /* Backgrounds & Text */
    --bg-color: #F8F9FC;
    --card-bg: #FFFFFF;
    --text-main: #172033;
    --text-muted: #718096;
    --border-color: #E8EAF0;

    /* Semantic Colors */
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
}

/* Dark Mode Overrides */
[data-theme="dark"] {
    --bg-color: #0F172A;
    --card-bg: #1E293B;
    --text-main: #F1F5F9;
    --text-muted: #94A3B8;
    --border-color: #334155;
    --light-lavender: #312E81;
}

* {
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    transition: background-color 0.3s, color 0.3s;
}

/* --- LAYOUT --- */
.app-container { display: flex; min-height: 100vh; }
.main-content { flex: 1; margin-left: 260px; padding: 2.5rem; max-width: 1400px; }

/* --- SIDEBAR --- */
.sidebar {
    width: 260px;
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 2000;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    margin-bottom: 2.5rem;
}

.sidebar-nav { display: flex; flex-direction: column; gap: 0.5rem; }

.sidebar-nav a {
    text-decoration: none;
    color: var(--text-muted);
    padding: 0.75rem 1rem;
    border-radius: 10px;
    font-weight: 500;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all 0.2s ease;
}

.sidebar-nav a:hover, .sidebar-nav a.active {
    background: var(--light-lavender);
    color: var(--primary);
}

.sidebar-nav a svg { stroke: currentColor; width: 20px; height: 20px; }

/* --- CARDS --- */
.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
    border: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

/* --- BUTTONS --- */
button {
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

button:hover { background: var(--primary-hover); }
.btn-secondary { background: var(--light-lavender); color: var(--primary); }
.btn-secondary:hover { background: #E0DDFE; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #DC2626; }
.btn-outline { background: transparent; border: 1px solid var(--border-color); color: var(--text-main); }
.btn-outline:hover { background: var(--bg-color); }

/* --- FORMS --- */
.form-group { margin-bottom: 1.25rem; }
label { display: block; font-size: 0.875rem; font-weight: 500; margin-bottom: 0.5rem; color: var(--text-main); }
input, textarea, select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    outline: none;
    background: var(--bg-color);
    color: var(--text-main);
    transition: border 0.2s;
}
input:focus, textarea:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--light-lavender); }

/* --- TOAST --- */
.toast-container { position: fixed; bottom: 20px; right: 20px; display: flex; flex-direction: column; gap: 10px; z-index: 9999; }
.toast { background: var(--text-main); color: var(--bg-color); padding: 1rem 1.5rem; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.15); font-weight: 500; animation: slideIn 0.3s ease-out; display: flex; align-items: center; gap: 0.5rem; }
.toast.success { background: var(--success); color: white; }
.toast.error { background: var(--danger); color: white; }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* --- MODAL --- */
.modal { display: none; position: fixed; z-index: 3000; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.5); justify-content: center; align-items: center; }
.modal-content { background: var(--card-bg); padding: 2rem; border-radius: 16px; max-width: 600px; width: 90%; max-height: 90vh; overflow-y: auto; }

/* --- FOOTER --- */
.app-footer { margin-top: 4rem; padding: 2rem 0; border-top: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; font-size: 0.85rem; color: var(--text-muted); }
.app-footer-links { display: flex; gap: 1.5rem; }
.app-footer-links a { color: var(--text-muted); text-decoration: none; }
.app-footer-links a:hover { color: var(--primary); }

/* --- INTERACTION BUTTONS --- */
.interaction-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.interaction-btn {
    background: none;
    border: none;
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    width: auto;
}

.interaction-btn:hover {
    background: var(--bg-color);
    color: var(--text-main);
}

.interaction-btn svg {
    width: 18px;
    height: 18px;
}

.btn-save-icon {
    margin-left: auto;
    color: var(--text-muted);
    background: none;
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s;
    width: auto;
}

.btn-save-icon:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--light-lavender);
}

.btn-save-icon svg {
    width: 16px;
    height: 16px;
}

/* --- MOBILE RESPONSIVE NAVIGATION --- */
.mobile-header {
    display: none;
    background: var(--card-bg);
    padding: 1rem;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.mobile-logo {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hamburger-btn {
    background: none;
    border: none;
    color: var(--text-main);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hamburger-btn svg {
    width: 28px;
    height: 28px;
}

.close-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
}

@media (max-width: 768px) {
    .mobile-header { display: flex; }
    .main-content { margin-left: 0; padding: 1rem; }

    .sidebar {
        left: -100%;
        transition: left 0.3s ease-in-out;
        box-shadow: 4px 0 15px rgba(0,0,0,0.1);
    }

    .sidebar.open {
        left: 0;
    }

    .close-menu-btn {
        display: block;
    }
}