:root {
    --bg-color: #0f0f13;
    --card-bg: rgba(255, 255, 255, 0.05);
    --primary: #00ff88;
    --secondary: #bd00ff;
    --text: #ffffff;
    --text-muted: #8b8b9e;
    --danger: #ff4757;
    --font-main: 'Inter', sans-serif;
    --radius: 16px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-color);
    color: var(--text);
    font-family: var(--font-main);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    background-image: radial-gradient(circle at 50% 50%, #1a1a2e 0%, #000 100%);
}

.app-container {
    width: 100%;
    max-width: 480px;
    height: 100vh;
    background: var(--bg-color);
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
}

@media (min-width: 480px) {
    .app-container {
        height: 90vh;
        border-radius: var(--radius);
        border: 1px solid rgba(255, 255, 255, 0.1);
    }
}

/* ================= SCREEN MANAGEMENT ================= */
.screen {
    flex: 1;
    display: none;
    /* Hidden by default */
    flex-direction: column;
    height: 100%;
    animation: fadeIn 0.3s ease;
}

.screen.active {
    display: flex;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ================= HOME SCREEN ================= */
.home-content {
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 100%;
    text-align: center;
}

.brand-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-subtitle {
    color: var(--text-muted);
    margin-bottom: 40px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.input-field {
    width: 100%;
    padding: 14px;
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: white;
    font-size: 1rem;
    transition: 0.3s;
}

.input-field:focus {
    border-color: var(--primary);
    outline: none;
    background: rgba(255, 255, 255, 0.08);
}

.btn-primary {
    width: 100%;
    padding: 16px;
    background: linear-gradient(90deg, var(--primary), #00cc6a);
    color: #000;
    font-weight: 700;
    font-size: 1.1rem;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 10px;
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-primary:hover {
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.4);
}

/* ================= CHAT SCREEN ================= */
.chat-header {
    padding: 16px 20px;
    background: rgba(20, 20, 25, 0.95);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(10px);
    z-index: 10;
}

.partner-info {
    display: flex;
    flex-direction: column;
}

.partner-name {
    font-weight: 600;
    font-size: 1.1rem;
}

.partner-status {
    font-size: 0.8rem;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 5px;
}

.typing-dot {
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0% {
        opacity: 0.4;
        transform: scale(0.8);
    }

    50% {
        opacity: 1;
        transform: scale(1.2);
    }

    100% {
        opacity: 0.4;
        transform: scale(0.8);
    }
}

.skip-btn {
    background: transparent;
    border: 1px solid var(--danger);
    color: var(--danger);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: 0.2s;
}

.skip-btn:hover {
    background: var(--danger);
    color: white;
}

.chat-area {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Custom Scrollbar */
.chat-area::-webkit-scrollbar {
    width: 6px;
}

.chat-area::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.message {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 18px;
    line-height: 1.4;
    position: relative;
    word-wrap: break-word;
    font-size: 0.95rem;
}

.message.stranger {
    background: var(--card-bg);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.message.user {
    background: var(--primary);
    color: #000;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
    font-weight: 500;
}

.system-message {
    align-self: center;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    font-size: 0.8rem;
    padding: 4px 12px;
    border-radius: 12px;
    margin: 10px 0;
}

.chat-input-area {
    padding: 16px;
    background: rgba(20, 20, 25, 0.95);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    gap: 10px;
}

.chat-input {
    flex: 1;
    background: var(--card-bg);
    border: none;
    padding: 12px 16px;
    border-radius: 24px;
    color: white;
    resize: none;
    max-height: 100px;
    font-family: inherit;
}

.chat-input:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.1);
}

.send-btn {
    width: 44px;
    height: 44px;
    background: var(--primary);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #000;
    transition: 0.2s;
}

.send-btn:hover {
    transform: scale(1.1);
}

.hidden {
    display: none !important;
}