/* ===== CSS Variables ===== */
:root {
    --accent-color: #4DD0E1;
    --accent-color-rgb: 77, 208, 225;
    --bg-primary: #111827;
    --bg-secondary: #1F2937;
    --bg-tertiary: #374151;
    --text-primary: #F3F4F6;
    --text-secondary: #9CA3AF;
    --border-color: #374151;
    --glass-border: rgba(255, 255, 255, 0.1);
    --warning-color: #F59E0B;
    --success-color: #10B981;
    --error-color: #EF4444;
}

/* ===== Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Layout ===== */
.page {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    padding-bottom: 70px; /* Space for bottom nav */
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* ===== Loading States ===== */
.loading-screen {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

.loading-spinner {
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-spinner.small {
    width: 20px;
    height: 20px;
    border-width: 2px;
}

.loading-spinner.medium {
    width: 40px;
    height: 40px;
}

.loading-spinner.large {
    width: 60px;
    height: 60px;
    border-width: 4px;
}

/* ===== Header ===== */
.page-header {
    position: sticky;
    top: 0;
    background: rgba(16, 20, 24, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    z-index: 100;
}

.header-content {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-title {
    font-size: 1.2rem;
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

/* ===== Buttons ===== */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 2rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(var(--accent-color-rgb), 0.3);
}

.btn-secondary {
    background: rgba(55, 65, 81, 0.5);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent-color);
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.btn-icon:hover {
    background: rgba(var(--accent-color-rgb), 0.1);
    color: var(--accent-color);
}

.btn-icon:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.form-group label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(55, 65, 81, 0.5);
    border: 2px solid var(--border-color);
    border-radius: 0.75rem;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
}

.form-control:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239CA3AF' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

/* ===== Error Messages ===== */
.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    color: var(--error-color);
    padding: 1rem;
    border-radius: 1rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

/* ===== Cards ===== */
.card {
    background: rgba(31, 41, 55, 0.5);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 1.25rem;
    transition: all 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 30px -10px rgba(0, 0, 0, 0.3);
    border-color: var(--accent-color);
}

/* ===== Bottom Navigation ===== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(16, 20, 24, 0.95);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--glass-border);
    height: 70px;
    z-index: 9998;
}

.nav-items {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    height: 100%;
    max-width: 28rem;
    margin: 0 auto;
    width: 100%;
}

.nav-item {
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: 100%;
    gap: 2px;
    background: none;
    border: none;
    font-family: inherit;
    transition: all 0.2s ease;
}

.nav-item.active {
    color: var(--accent-color);
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background-color: var(--accent-color);
}

.icon-container {
    position: relative;
    display: inline-flex;
}

.nav-label {
    font-size: 12px;
    margin-top: 2px;
}

.notification-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background-color: var(--error-color);
    color: white;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    font-size: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--bg-secondary);
}

/* ===== Modals ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.2s ease;
}

.modal-container {
    width: 90%;
    max-width: 400px;
    background: var(--bg-secondary);
    border-radius: 1.5rem;
    overflow: hidden;
    animation: slideUp 0.3s ease;
    display: flex;
    flex-direction: column;
    max-height: 90vh;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.modal-header h2 {
    color: var(--text-primary);
    font-size: 1.2rem;
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 1rem;
    flex-shrink: 0;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

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

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-8px); }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-label {
        font-size: 11px;
    }

    .modal-container {
        width: 95%;
    }
}