:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-main: #111827;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --danger-color: #ef4444;
    --success-color: #10b981;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 1.875rem;
    font-weight: 800;
    color: var(--text-main);
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.btn-link {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    text-decoration: underline;
    font-size: 0.875rem;
}

.btn-link:hover {
    color: var(--text-main);
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

input, select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    color: var(--text-main);
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.btn-primary {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.375rem;
    background-color: var(--primary-color);
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

/* Grid */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 640px) {
    .grid-2 {
        grid-template-columns: 1fr 1fr;
    }
}

/* Subscription List */
.sub-list {
    list-style: none;
}

.sub-item {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sub-item:last-child {
    border-bottom: none;
}

.sub-item:hover {
    background-color: #f9fafb;
}

.sub-info h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.sub-price {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.sub-meta {
    font-size: 0.75rem;
    color: #9ca3af;
    margin-top: 0.25rem;
}

.sub-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    border-radius: 0.25rem;
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-delete {
    color: var(--danger-color);
    background-color: transparent;
    border-color: #fecaca;
}

.btn-delete:hover {
    background-color: #fef2f2;
}

.btn-check {
    color: var(--primary-color);
    background-color: transparent;
    border-color: #c7d2fe;
}

.btn-check:hover {
    background-color: #eef2ff;
}

/* Cost Summary */
.summary-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

@media (min-width: 640px) {
    .summary-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.summary-card {
    padding: 1.5rem;
    border-radius: 0.5rem;
    color: white;
}

.summary-monthly {
    background-color: var(--primary-color);
}

.summary-yearly {
    background-color: var(--success-color);
}

.summary-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.9;
}

.summary-amount {
    font-size: 1.875rem;
    font-weight: 700;
    margin-top: 0.5rem;
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.login-box {
    width: 100%;
    max-width: 400px;
}

.text-center {
    text-align: center;
}

.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }

.error-msg {
    color: var(--danger-color);
    font-size: 0.875rem;
    text-align: center;
    margin-bottom: 1rem;
}