/* ========================================
   Hero Section
   ======================================== */
.hero {
    text-align: center;
    padding: 3rem 1rem 2rem;
    position: relative;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 2.5rem);
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
    color: #000;
    line-height: 1.2;
}

.hero p {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin: 0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ========================================
   Main Layout
   ======================================== */
.cards-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1rem 0;
    min-height: calc(100vh - 200px);
}

.card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-large);
    box-shadow: var(--shadow);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.card h2 {
    margin-top: 0;
    margin-bottom: var(--spacing-md);
    color: #000;
    font-size: 1.5rem;
    font-weight: 400;
}

/* ========================================
   Subscribe Form
   ======================================== */
.subscribe-group {
    display: flex;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0 var(--spacing-xs);
    align-items: flex-start;
    width: 100%;
}

.input-with-icon {
    position: relative;
    flex: 1;
    width: 100%;
}

.input-with-icon input {
    width: 100%;
    padding: 16px 50px 16px 16px;
    font-size: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-sizing: border-box;
    height: 52px;
    min-width: 0;
}

.help-icon {
    position: absolute;
    top: 50%;
    right: 12px;
    transform: translateY(-50%);
    background: var(--secondary);
    color: white;
    border-radius: 50%;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid white;
    box-shadow: var(--shadow-light);
}

.help-icon:hover {
    background: var(--primary);
    transform: translateY(-50%) scale(1.05);
}

.subscribe-group .button {
    flex-shrink: 0;
    padding: 16px 24px;
    font-size: 1rem;
    font-weight: 600;
    height: 52px;
    white-space: nowrap;
    min-width: 140px;
}

/* ========================================
   Management Section
   ======================================== */
.manage-sub-link {
    font-size: 0.95rem;
    color: var(--text-muted);
    cursor: pointer;
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius);
    transition: var(--transition);
    display: inline-block;
}

.manage-sub-link:hover {
    text-decoration: underline;
    color: var(--secondary);
    background: rgba(52, 152, 219, 0.05);
}

.button-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.button-group .button {
    width: 100%;
    justify-content: center;
}

.notice {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: var(--spacing-md);
    line-height: 1.4;
    padding: var(--spacing-sm);
    background: rgba(102, 102, 102, 0.05);
    border-radius: var(--radius);
    border-left: 3px solid var(--text-muted);
}

/* ========================================
   Modals
   ======================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: var(--spacing-sm);
    box-sizing: border-box;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: var(--radius-large);
    padding: var(--spacing-lg);
    width: 100%;
    max-width: 600px;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalEnter 0.2s ease-out;
}

@keyframes modalEnter {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.close-button {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
    color: var(--text-muted);
    background: white;
}

.close-button:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--primary);
}

/* ========================================
   Footer
   ======================================== */
.footer-links {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(248, 249, 250, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(221, 221, 221, 0.5);
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    z-index: 50;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.footer-links a:hover {
    background: white;
    color: var(--secondary);
    box-shadow: var(--shadow-light);
    text-decoration: none;
}

.footer-links .version {
    color: var(--text-light);
    font-size: 0.7rem;
    font-weight: normal;
    opacity: 0.6;
    margin-left: auto;
}

/* ========================================
   Loading States
   ======================================== */
.global-loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(2px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

.global-loading.active {
    display: flex;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--secondary);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .hero {
        padding: 2rem 1rem 1.5rem;
    }
    
    .card {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-sm);
    }
    
    .subscribe-group {
        flex-direction: column;
        gap: var(--spacing-sm);
        width: 100%;
    }

    .input-with-icon {
        width: 100%;
    }

    .input-with-icon input {
        width: 100%;
        padding-right: 45px;
        box-sizing: border-box;
    }
    
    .subscribe-group .button {
        width: 100%;
        min-width: auto;
        box-sizing: border-box;
    }
    
    .button-group {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        margin: var(--spacing-sm);
        padding: var(--spacing-md);
        max-height: 90vh;
    }
    
    .footer-links {
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-xs);
        padding: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.75rem;
    }

    .card {
        padding: var(--spacing-md);
        margin: 0 0.5rem var(--spacing-sm);
        box-sizing: border-box;
    }
    
    .cards-container {
        padding: 0 0.75rem 5rem;
    }
    
    .input-with-icon input {
        padding-right: 45px;
        font-size: 16px;
    }
    
    .help-icon {
        width: 24px;
        height: 24px;
        right: 10px;
        font-size: 0.8rem;
    }
}

/* ========================================
   High contrast mode support
   ======================================== */
@media (prefers-contrast: high) {
    :root {
        --border: #000;
        --shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
        --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.2);
    }
    
    .button {
        border: 2px solid currentColor;
    }
}