:root {
    --whatsapp-green: #00A884;
    --whatsapp-green-hover: #00CE9F;
    --bg-dark: #111B21;
    --bg-card: #202C33;
    --text-primary: #E9EDEF;
    --text-secondary: #8696A0;
    --danger: #F15C6D;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow-x: hidden;
}

#app {
    width: 100%;
    max-width: 450px;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 30px;
    transition: all 0.3s ease;
}

.hidden {
    display: none !important;
}

/* LOGIN SCREEN */
#login-screen {
    justify-content: center;
    text-align: center;
}

.logo {
    font-size: 80px;
    margin-bottom: 20px;
}

h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

p {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

#login-form input {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid #3B4A54;
    padding: 15px;
    color: white;
    border-radius: 8px;
    margin-bottom: 15px;
    font-size: 16px;
    outline: none;
}

#login-form input:focus {
    border-color: var(--whatsapp-green);
}

.btn-primary {
    width: 100%;
    background: var(--whatsapp-green);
    border: none;
    padding: 15px;
    color: white;
    font-weight: bold;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
}

.btn-primary:active {
    background: var(--whatsapp-green-hover);
}

.error-msg {
    color: var(--danger);
    margin-top: 15px;
    font-size: 14px;
}

/* MAIN SCREEN */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid #3B4A54;
    margin-bottom: 20px;
}

#logout-btn {
    background: transparent;
    border: 1px solid var(--text-secondary);
    color: var(--text-secondary);
    padding: 5px 12px;
    border-radius: 12px;
    font-size: 12px;
}

.gps-status-card {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    margin-bottom: 25px;
}

.status-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
}

.dot-red { background: #FF5252; height: 10px; width: 10px; border-radius: 50%; display: inline-block; margin-right: 8px; }
.dot-green { background: #4CAF50; height: 10px; width: 10px; border-radius: 50%; display: inline-block; margin-right: 8px; }

.coords {
    font-family: monospace;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.btn-gps {
    background: #1565C0;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 14px;
}

.btn-gps.active { background: var(--danger); }

/* CHAT LIST */
.chat-list-container { flex: 1; overflow-y: auto; }
.chat-list-container h3 { margin-bottom: 15px; }
.empty-msg { color: var(--text-secondary); font-style: italic; font-size: 14px; }

/* PWA INSTALL BANNER */
#pwa-install-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-card);
    padding: 20px;
    border-top: 3px solid var(--whatsapp-green);
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 -5px 15px rgba(0,0,0,0.6);
    z-index: 10000;
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

#pwa-install-banner p { 
    margin-bottom: 15px; 
    font-size: 14px; 
    text-align: center;
    color: var(--text-primary);
}

.banner-btns { 
    display: flex; 
    gap: 10px; 
    width: 100%; 
}

.btn-banner-ok { 
    flex: 2; 
    background: var(--whatsapp-green); 
    color: white; 
    border: none; 
    padding: 12px; 
    border-radius: 8px; 
    font-weight: bold;
    cursor: pointer;
}

.btn-banner-no { 
    flex: 1; 
    background: transparent; 
    color: var(--text-secondary); 
    border: 1px solid var(--text-secondary); 
    padding: 12px; 
    border-radius: 8px;
    cursor: pointer;
}