:root {
    --primary-color: #4A90E2;
    --secondary-color: #50C878;
    --danger-color: #E74C3C;
    --warning-color: #F39C12;
    --dark-bg: #1a1a1a;
    --light-bg: #f5f5f5;
    --text-primary: #333;
    --text-secondary: #666;
    --border-color: #ddd;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.2);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    overflow: hidden;
}

.hidden {
    display: none !important;
}

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    z-index: 9999;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255,255,255,0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

#auth-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-container {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    max-width: 400px;
    width: 90%;
}

.logo {
    text-align: center;
    margin-bottom: 2rem;
}

.logo h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.logo p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.auth-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tab-btn {
    flex: 1;
    padding: 0.75rem;
    border: none;
    background: var(--light-bg);
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s;
}

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

.auth-tab {
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.auth-tab input {
    width: 100%;
    padding: 0.75rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

.auth-error {
    background: #ffe6e6;
    color: var(--danger-color);
    padding: 0.75rem;
    border-radius: 8px;
    margin-top: 1rem;
    font-size: 0.9rem;
}

#main-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.app-header {
    background: white;
    padding: 1rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
}

.app-header h1 {
    font-size: 1.2rem;
}

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

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--light-bg);
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s;
}

.icon-btn:hover {
    background: var(--primary-color);
    transform: scale(1.1);
}

.map-container {
    flex: 1;
    position: relative;
}

#map {
    width: 100%;
    height: 100%;
}

.fab {
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    border: none;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    font-size: 2rem;
    z-index: 999;
    transition: all 0.3s;
}

.fab:hover {
    transform: scale(1.1) rotate(90deg);
}

.fab:active {
    transform: scale(0.95);
}

.bottom-nav {
    background: white;
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    box-shadow: 0 -2px 8px rgba(0,0,0,0.1);
    z-index: 1000;
}

.nav-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    border: none;
    background: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-secondary);
    transition: all 0.3s;
}

.nav-btn.active {
    color: var(--primary-color);
}

.nav-icon {
    font-size: 1.5rem;
}

.nav-label {
    font-size: 0.75rem;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    animation: fadeIn 0.3s;
}

.modal-content {
    background: white;
    border-radius: 16px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s;
}

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

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

.modal-header h2 {
    font-size: 1.2rem;
}

.close-btn {
    width: 30px;
    height: 30px;
    border: none;
    background: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.modal-body {
    padding: 1.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

.help-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.audio-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 0.5rem;
}

#audio-preview {
    width: 100%;
    margin-top: 0.5rem;
}

.recipient-list {
    max-height: 150px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
}

.recipient-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    margin-bottom: 0.25rem;
}

.recipient-item input[type="checkbox"] {
    width: auto;
}

.btn-primary,
.btn-secondary {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    width: 100%;
}

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

.btn-primary:hover {
    background: #3a7bc8;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.btn-secondary:hover {
    background: #e0e0e0;
}

.lock-status {
    padding: 1.5rem;
    text-align: center;
}

.lock-status.locked {
    color: var(--warning-color);
}

.lock-status.unlocked {
    color: var(--secondary-color);
}

@media (max-width: 600px) {
    .modal-content {
        width: 95%;
        max-height: 95vh;
    }

    .fab {
        bottom: 70px;
        right: 15px;
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }
}