@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400&display=swap');

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

:root {
    --black: #000;
    --white: #fff;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-400: #a3a3a3;
    --gray-600: #525252;
    --gray-800: #262626;
    --green: #22c55e;
}

body {
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    line-height: 1.6;
    background: var(--white);
    color: var(--black);
    min-height: 100dvh;
}

.app {
    max-width: 480px;
    margin: 0 auto;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

header {
    padding: 20px;
    border-bottom: 1px solid var(--gray-200);
}

header h1 {
    font-size: 12px;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.2em;
}

/* Screens */
.screen {
    display: none;
    flex: 1;
    flex-direction: column;
}

.screen.active { display: flex; }

.screen-content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

.screen-actions {
    padding: 20px;
    border-top: 1px solid var(--gray-200);
}

/* Buttons */
button {
    font-family: inherit;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 16px 24px;
    border: 1px solid var(--black);
    background: var(--white);
    color: var(--black);
    cursor: pointer;
    width: 100%;
    transition: background 0.15s, color 0.15s;
}

button:hover, button:active {
    background: var(--black);
    color: var(--white);
}

button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

button + button { margin-top: 10px; }

button.secondary {
    border-color: var(--gray-400);
    color: var(--gray-600);
}

.back-btn {
    background: none;
    border: none;
    padding: 0;
    width: auto;
    font-size: 12px;
    margin-bottom: 20px;
    color: var(--gray-600);
}

.back-btn:hover {
    color: var(--black);
    background: none;
}

/* Form elements */
input, textarea {
    font-family: inherit;
    font-size: 14px;
    padding: 16px;
    border: 1px solid var(--gray-200);
    background: var(--gray-100);
    width: 100%;
    outline: none;
    transition: border-color 0.15s;
}

input:focus, textarea:focus { border-color: var(--black); }

textarea {
    resize: none;
    min-height: 120px;
}

label {
    display: block;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--gray-600);
    margin-bottom: 8px;
}

.field + .field { margin-top: 20px; }

.key-display {
    font-size: 11px;
    word-break: break-all;
    background: var(--gray-100);
    padding: 16px;
    border: 1px solid var(--gray-200);
    user-select: all;
}

/* QR */
.qr-container {
    display: flex;
    justify-content: center;
    padding: 20px 0;
}

.qr-container canvas, .qr-container svg {
    max-width: 200px;
    max-height: 200px;
}

#qr-video {
    width: 100%;
    max-height: 300px;
    background: var(--gray-100);
    object-fit: cover;
}

/* Messages */
.messages {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    padding: 16px;
    border: 1px solid var(--gray-200);
}

.message.mine {
    background: var(--gray-100);
    margin-left: 40px;
}

.message.theirs { margin-right: 40px; }

.message-text {
    white-space: pre-wrap;
    word-break: break-word;
}

.message-meta {
    font-size: 10px;
    color: var(--gray-400);
    margin-top: 8px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    display: flex;
    justify-content: space-between;
}

.verified-badge { color: var(--green); }
.unverified-badge { color: var(--gray-400); }

.empty-state {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Contacts */
.contact-header {
    font-size: 11px;
    color: var(--gray-600);
    padding-bottom: 16px;
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.contact-header .verified { color: var(--green); }

.contact-list { list-style: none; }

.contact-item {
    padding: 16px;
    border: 1px solid var(--gray-200);
    cursor: pointer;
    transition: background 0.15s;
    position: relative;
}

.contact-item:hover { background: var(--gray-100); }
.contact-item + .contact-item { margin-top: 10px; }

.contact-name { font-size: 14px; }

.contact-key {
    font-size: 10px;
    color: var(--gray-400);
    margin-top: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.unread-dot {
    position: absolute;
    top: 50%;
    right: 16px;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--black);
    border-radius: 50%;
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--gray-200);
}

.tab {
    flex: 1;
    padding: 16px;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    text-align: center;
    cursor: pointer;
    border: none;
    background: none;
    color: var(--gray-400);
}

.tab:hover { color: var(--black); }
.tab.active {
    color: var(--black);
    box-shadow: inset 0 -2px 0 var(--black);
}

/* Compose */
.compose-area {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.compose-area textarea {
    flex: 1;
    min-height: 60px;
}

.compose-area button {
    width: auto;
    padding: 16px 20px;
}

/* Password screen */
.checkbox-field {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
}

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

.checkbox-field label {
    margin: 0;
    font-size: 12px;
    text-transform: none;
    letter-spacing: normal;
    color: var(--black);
}

/* Fingerprint */
.fingerprint {
    font-size: 13px;
    letter-spacing: 0.1em;
    text-align: center;
    padding: 16px;
    background: var(--gray-100);
    border: 1px solid var(--gray-200);
    font-family: inherit;
}

.emoji-fingerprint {
    font-size: 32px;
    text-align: center;
    letter-spacing: 0.2em;
    padding: 20px;
}

/* Utility */
.hidden { display: none !important; }
.status {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 10px;
    text-align: center;
}
.status.error {
    background: var(--gray-100);
    color: var(--gray-800);
}