* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-card: #1a1a1a;
    --border: #2c2c2c;
    --text-primary: #f0f0f0;
    --text-secondary: #b0b0b0;
    --accent: #ffffff;
    --accent-soft: #2a2a2a;
    --danger: #e5484d;
    --warning: #f5a623;
    --success: #2ecc71;
    --info: #3498db;
    --shadow: 0 8px 20px rgba(0,0,0,0.4);
}

body.light {
    --bg-primary: #f4f6fa;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --border: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --accent: #0f172a;
    --accent-soft: #f1f5f9;
    --shadow: 0 8px 20px rgba(0,0,0,0.05);
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
}

/* Login Page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
}

body.light .login-page {
    background: linear-gradient(135deg, #e2e8f0 0%, #f4f6fa 100%);
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 1rem;
}

.login-card {
    background: var(--bg-card);
    border-radius: 32px;
    padding: 2.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    text-align: center;
}

.login-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.login-card h1 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.login-card p {
    color: var(--text-secondary);
    margin-bottom: 1.8rem;
}

.error-message {
    background: var(--danger);
    color: white;
    padding: 10px;
    border-radius: 12px;
    margin-bottom: 1rem;
    font-size: 0.85rem;
}

.btn-login {
    width: 100%;
    padding: 12px;
    background: var(--accent);
    color: var(--bg-primary);
    font-weight: 700;
    border: none;
    border-radius: 40px;
    cursor: pointer;
    margin-top: 0.5rem;
}

.login-footer {
    margin-top: 1.5rem;
    color: var(--text-secondary);
}

/* Main App */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
    background: var(--bg-card);
    padding: 1rem 1.5rem;
    border-radius: 60px;
    border: 1px solid var(--border);
}

.logo h1 {
    font-size: 1.4rem;
}

.logo-sub {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.header-actions {
    display: flex;
    gap: 1rem;
}

.theme-btn, .logout-btn {
    background: var(--accent-soft);
    border: none;
    padding: 8px 18px;
    border-radius: 40px;
    cursor: pointer;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
}

/* Business Selector */
.business-selector {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    background: var(--bg-card);
    padding: 0.5rem;
    border-radius: 60px;
    border: 1px solid var(--border);
    width: fit-content;
}

.business-btn {
    padding: 10px 28px;
    border-radius: 40px;
    background: transparent;
    border: none;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-secondary);
}

.business-btn.active {
    background: var(--accent);
    color: var(--bg-primary);
}

/* Tabs */
.nav-tabs {
    display: flex;
    gap: 0.8rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
    flex-wrap: wrap;
}

.tab-btn {
    background: transparent;
    border: none;
    padding: 10px 24px;
    font-weight: 600;
    border-radius: 40px;
    cursor: pointer;
    color: var(--text-secondary);
}

.tab-btn.active {
    background: var(--accent);
    color: var(--bg-primary);
}

.tab-content {
    display: none;
    animation: fade 0.2s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fade {
    from { opacity: 0; transform: translateY(5px);}
    to { opacity: 1; transform: translateY(0);}
}

/* Stats */
.stats-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 28px;
    padding: 1.2rem 1.8rem;
    flex: 1;
    min-width: 150px;
}

.stat-card i {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    display: block;
}

.stat-card span {
    font-size: 1.8rem;
    font-weight: 700;
}

/* Action Bar */
.action-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-primary);
    font-weight: 700;
    padding: 10px 20px;
    border-radius: 40px;
    border: none;
    cursor: pointer;
}

.search-box input {
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 40px;
    width: 260px;
    color: var(--text-primary);
}

/* Tables */
.table-wrapper {
    overflow-x: auto;
    border-radius: 24px;
    border: 1px solid var(--border);
    background: var(--bg-card);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    text-align: left;
    padding: 14px 12px;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--bg-secondary);
    font-weight: 600;
}

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 60px;
    font-size: 0.7rem;
    font-weight: 600;
}

.status-pending { background: var(--warning); color: #000; }
.status-completed { background: var(--success); color: #000; }
.status-overdue { background: var(--danger); color: #fff; }
.status-process { background: var(--info); color: #fff; }
.status-interested { background: var(--info); color: #fff; }

.btn-small, .btn-delete {
    background: var(--accent-soft);
    border: none;
    padding: 4px 12px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.7rem;
    margin: 0 2px;
}

.btn-delete {
    background: var(--danger);
    color: white;
}

/* Form */
.form-add {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 28px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: flex-end;
}

.form-group {
    flex: 1;
    min-width: 140px;
}

.form-group label {
    font-size: 0.7rem;
    font-weight: 600;
    display: block;
    margin-bottom: 5px;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-primary);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-card);
    border-radius: 32px;
    padding: 2rem;
    width: 90%;
    max-width: 500px;
    border: 1px solid var(--border);
}

.close-modal {
    float: right;
    font-size: 1.5rem;
    cursor: pointer;
}

.info-card {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 1.5rem;
    margin-top: 1.5rem;
}

footer {
    text-align: center;
    margin-top: 3rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

@media (max-width: 700px) {
    .app-container { padding: 1rem; }
    .form-add { flex-direction: column; }
    .business-selector { width: 100%; justify-content: center; }
    .action-bar { flex-direction: column; align-items: stretch; }
    .search-box input { width: 100%; }
}