:root {
    --bg-color: #0d1117;
    --card-bg: rgba(255, 255, 255, 0.05);
    --accent-color: #58a6ff;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --success: #2ea043;
    --error: #f85149;
    --safe-top: env(safe-area-inset-top);
    --safe-bottom: env(safe-area-inset-bottom);
}

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

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    /* iOS Momentum Scrolling */
    -webkit-overflow-scrolling: touch;
}

.app-container {
    padding-top: calc(var(--safe-top) + 20px);
    padding-bottom: calc(var(--safe-bottom) + 20px);
    padding-left: 20px;
    padding-right: 20px;
    max-width: 600px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    margin-bottom: 30px;
    text-align: center;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #58a6ff 0%, #bc8cff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.status-indicator {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.status-indicator.offline { background: rgba(248, 81, 73, 0.1); color: var(--error); border: 1px solid var(--error); }
.status-indicator.online { background: rgba(46, 160, 67, 0.1); color: var(--success); border: 1px solid var(--success); }

.sync-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

h2, h3 {
    font-size: 1.1rem;
    margin-top: 0;
    color: var(--text-secondary);
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

input {
    flex: 1;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 12px 16px;
    color: white;
    font-size: 16px; /* Avoid iOS zoom on focus */
    outline: none;
}

input:focus {
    border-color: var(--accent-color);
}

button {
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 20px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.1s;
}

button:active {
    transform: scale(0.95);
}

.data-box {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    padding: 16px;
    min-height: 50px;
    word-break: break-all;
    font-family: monospace;
    color: #a5d6ff;
}

.log-box {
    background: #000;
    border-radius: 8px;
    padding: 12px;
    height: 150px;
    overflow-y: auto;
    font-size: 0.8rem;
    font-family: monospace;
    color: #8b949e;
}

.log-entry { margin-bottom: 4px; border-bottom: 1px solid #161b22; padding-bottom: 2px; }
.log-entry.success { color: var(--success); }
.log-entry.error { color: var(--error); }

code {
    background: #161b22;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

footer {
    margin-top: auto;
    text-align: center;
    padding: 20px 0;
}