:root {
    --primary-color: #0088cc;
    --primary-hover: #006ba6;
    --secondary-color: #f0f2f5;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --text-primary: #1a1a1a;
    --text-secondary: #65676b;
    --border-color: #dddfe2;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.anycoder-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.anycoder-link:hover {
    color: var(--primary-hover);
}

/* Main */
.main {
    padding: 2rem 0 4rem;
}

.scheduler-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Auth Section */
.auth-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
}

.auth-card {
    background: white;
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

.auth-card h2 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.auth-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Scheduler Section */
.scheduler-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.status-bar {
    background: white;
    border-radius: 12px;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-md);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--danger-color);
    animation: pulse 2s infinite;
}

.status-dot.connected {
    background: var(--success-color);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.status-text {
    font-weight: 500;
}

.scheduler-card,
.scheduled-messages-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.scheduler-card h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

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

input[type="text"],
input[type="number"],
input[type="password"],
input[type="datetime-local"],
textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    background: white;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 136, 204, 0.1);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

.char-count {
    text-align: right;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.radio-group {
    display: flex;
    gap: 2rem;
    margin-top: 0.5rem;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 400;
}

input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.radio-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    position: relative;
    transition: var(--transition);
}

input[type="radio"]:checked + .radio-custom {
    border-color: var(--primary-color);
}

input[type="radio"]:checked + .radio-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary-color);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background: #e4e6eb;
}

.btn-icon {
    padding: 0.5rem;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

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

.btn-icon svg {
    width: 20px;
    height: 20px;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* Message Status */
.message-status {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    opacity: 0;
    transform: translateY(-10px);
    transition: var(--transition);
}

.message-status.show {
    opacity: 1;
    transform: translateY(0);
}

.message-status.success {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success-color);
}

.message-status.error {
    background: rgba(220, 53, 69, 0.1);
    color: var(--danger-color);
}

.message-status.warning {
    background: rgba(255, 193, 7, 0.1);
    color: var(--warning-color);
}

.status-icon {
    width: 20px;
    height: 20px;
}

/* Scheduled Messages */
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.card-header h3 {
    color: var(--text-primary);
}

.messages-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message-item {
    padding: 1rem;
    background: var(--secondary-color);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
}

.message-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.message-recipient {
    font-weight: 600;
    color: var(--primary-color);
}

.message-time {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.message-content {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    white-space: pre-wrap;
}

.message-status {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-state svg {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.modal.show {
    opacity: 1;
    pointer-events: all;
}

.modal-content {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    max-width: 400px;
    width: 90%;
    transform: scale(0.9);
    transition: transform 0.3s;
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal h3 {
    margin-bottom: 1rem;
}

.modal p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

/* Footer */
.footer {
    background: rgba(255, 255, 255, 0.95);
    padding: 1.5rem 0;
    text-align: center;
    color: var(--text-secondary);
    margin-top: auto;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

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

/* Responsive Design */
@media (min-width: 768px) {
    .scheduler-section {
        grid-template-columns: 2fr 1fr;
    }
}

@media (max-width: 640px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .radio-group {
        flex-direction: column;
        gap: 1rem;
    }
    
    .scheduler-card,
    .scheduled-messages-card {
        padding: 1.5rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* Loading Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Success/Error Messages */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transform: translateX(400px);
    transition: transform 0.3s;
    z-index: 1001;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--danger-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}