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

:root {
    --primary-green: #25D366;
    --dark-green: #128C7E;
    --darker-green: #075E54;
    --chat-bg: #ECE5DD;
    --own-message: #DCF8C6;
    --partner-message: #FFFFFF;
    --text-dark: #303030;
    --text-light: #667781;
    --border-color: #E0E0E0;
    --danger: #FF5252;
}

html, body {
    height: 100%;
    height: 100dvh;
    overflow: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--chat-bg);
    color: var(--text-dark);
    line-height: 1.4;
}

/* ===== Landing Page ===== */
.landing-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--dark-green) 0%, var(--darker-green) 100%);
    padding: 20px;
}

.landing-content {
    background: white;
    border-radius: 20px;
    padding: 40px;
    max-width: 400px;
    width: 100%;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.logo {
    margin-bottom: 20px;
}

.logo-icon {
    font-size: 48px;
    display: block;
    margin-bottom: 10px;
}

.logo h1 {
    color: var(--dark-green);
    font-size: 32px;
    font-weight: 700;
}

.tagline {
    color: var(--text-light);
    font-size: 16px;
    margin-bottom: 30px;
}

.features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 30px;
}

.feature {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: #f8f9fa;
    border-radius: 10px;
    text-align: left;
}

.feature-icon {
    font-size: 24px;
}

.start-button {
    display: inline-block;
    background: var(--primary-green);
    color: white;
    text-decoration: none;
    padding: 16px 40px;
    border-radius: 30px;
    font-size: 18px;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}

.start-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(37, 211, 102, 0.4);
}

.how-it-works {
    margin-top: 30px;
    text-align: left;
}

.how-it-works h2 {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.how-it-works ol {
    padding-left: 20px;
    color: var(--text-dark);
}

.how-it-works li {
    padding: 6px 0;
}

.language-selector {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    gap: 10px;
}

.lang-btn {
    padding: 8px 16px;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

.lang-btn:hover,
.lang-btn.active {
    border-color: var(--primary-green);
    background: var(--primary-green);
    color: white;
}

/* ===== Chat Page ===== */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height for mobile */
    max-width: 600px;
    margin: 0 auto;
    background: white;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

@media (min-width: 601px) {
    .chat-container {
        position: relative;
        left: auto;
        right: auto;
    }
}

/* Header */
.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--dark-green);
    color: white;
    flex-shrink: 0;
    z-index: 10;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.back-btn {
    color: white;
    text-decoration: none;
    font-size: 24px;
    padding: 4px;
}

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

.partner-name {
    font-weight: 600;
    font-size: 16px;
}

.status {
    font-size: 12px;
    opacity: 0.9;
}

.status.online {
    color: #7FFF7F;
}

.status.offline {
    color: #FFB3B3;
}

.header-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.action-btn {
    background: transparent;
    border: none;
    color: white;
    font-size: 18px;
    padding: 8px;
    cursor: pointer;
    border-radius: 50%;
    transition: background 0.2s;
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.action-btn.danger:hover {
    background: rgba(255, 82, 82, 0.3);
}

/* Language dropdown */
.lang-dropdown {
    position: relative;
}

.lang-menu {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    min-width: 120px;
    z-index: 100;
}

.lang-dropdown:hover .lang-menu {
    display: block;
}

.lang-menu button {
    display: block;
    width: 100%;
    padding: 10px 16px;
    border: none;
    background: white;
    text-align: left;
    cursor: pointer;
    color: var(--text-dark);
}

.lang-menu button:hover {
    background: #f0f0f0;
}

/* Connection overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.overlay-content {
    background: white;
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    max-width: 400px;
    width: 90%;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.share-link {
    display: flex;
    gap: 8px;
    margin-top: 20px;
}

.share-link input {
    flex: 1;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
}

.share-link button {
    padding: 12px 20px;
    background: var(--primary-green);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
}

.share-hint {
    margin-top: 12px;
    font-size: 14px;
    color: var(--text-light);
}

.retry-btn-overlay {
    margin-top: 20px;
    padding: 14px 28px;
    background: var(--primary-green);
    color: white;
    border: none;
    border-radius: 24px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.2s;
}

.retry-btn-overlay:hover {
    background: var(--dark-green);
    transform: scale(1.02);
}

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

/* Messages area */
.messages {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 16px;
    background: var(--chat-bg);
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23d4d4d4' fill-opacity='0.2'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    -webkit-overflow-scrolling: touch;
    min-height: 0;
    /* Anti-screenshot measures */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    /* WhatsApp-style: messages stick to bottom */
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.messages-inner {
    display: flex;
    flex-direction: column;
    min-height: min-content;
}

.message {
    max-width: 75%;
    margin-bottom: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    position: relative;
    word-wrap: break-word;
}

.message.own {
    background: var(--own-message);
    margin-left: auto;
    border-bottom-right-radius: 2px;
}

.message.partner {
    background: var(--partner-message);
    margin-right: auto;
    border-bottom-left-radius: 2px;
}

.message .text {
    font-size: 14px;
    line-height: 1.4;
}

.message .time {
    font-size: 11px;
    color: var(--text-light);
    text-align: right;
    margin-top: 4px;
}

.message .status-icon {
    margin-left: 4px;
}

.message.own .status-icon.delivered {
    color: var(--primary-green);
}

/* Media messages */
.message-media {
    max-width: 100%;
    border-radius: 8px;
    cursor: pointer;
}

.message-media img,
.message-media video {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
}

/* System messages */
.system-message {
    text-align: center;
    padding: 8px 16px;
    margin: 8px auto;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    font-size: 12px;
    color: var(--text-light);
    max-width: 80%;
}

/* Typing indicator */
.typing-indicator {
    padding: 8px 16px;
    font-size: 14px;
    color: var(--text-light);
    background: var(--chat-bg);
}

.typing-indicator .dots span {
    animation: typingDots 1.4s infinite;
    animation-fill-mode: both;
}

.typing-indicator .dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator .dots span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingDots {
    0%, 80%, 100% { opacity: 0; }
    40% { opacity: 1; }
}

/* Input area */
.input-area {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    padding-bottom: max(8px, env(safe-area-inset-bottom));
    background: #f0f0f0;
    flex-shrink: 0;
    z-index: 10;
}

.emoji-btn,
.media-btn {
    background: transparent;
    border: none;
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.media-btn {
    cursor: pointer;
}

#message-input {
    flex: 1;
    padding: 12px 16px;
    border: none;
    border-radius: 24px;
    font-size: 15px;
    outline: none;
}

.send-btn {
    background: var(--primary-green);
    border: none;
    color: white;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.send-btn:hover {
    background: var(--dark-green);
}

/* Emoji picker */
.emoji-picker {
    position: absolute;
    bottom: 70px;
    left: 16px;
    right: 16px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    max-height: 320px;
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.emoji-search {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

.emoji-search input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
}

.emoji-search input:focus {
    border-color: var(--primary-green);
}

.emoji-categories {
    display: flex;
    padding: 8px;
    gap: 4px;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
}

.emoji-category-btn {
    padding: 8px 12px;
    border: none;
    background: transparent;
    font-size: 18px;
    cursor: pointer;
    border-radius: 8px;
    flex-shrink: 0;
}

.emoji-category-btn:hover,
.emoji-category-btn.active {
    background: #f0f0f0;
}

.emoji-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 4px;
    padding: 12px;
    overflow-y: auto;
    max-height: 200px;
}

.emoji-item {
    font-size: 24px;
    padding: 8px;
    text-align: center;
    cursor: pointer;
    border-radius: 8px;
    transition: background 0.1s;
}

.emoji-item:hover {
    background: #f0f0f0;
}

/* Media preview modal */
.media-preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.media-preview-modal .modal-content {
    background: white;
    border-radius: 12px;
    padding: 20px;
    max-width: 90%;
    max-height: 90%;
}

.close-modal {
    position: absolute;
    top: 16px;
    right: 16px;
    background: white;
    border: none;
    font-size: 32px;
    cursor: pointer;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-container {
    max-height: 60vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-container img,
.preview-container video {
    max-width: 100%;
    max-height: 60vh;
    border-radius: 8px;
}

.preview-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 20px;
}

.cancel-btn {
    padding: 12px 32px;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 24px;
    cursor: pointer;
    font-size: 16px;
}

.preview-actions .send-btn {
    width: auto;
    padding: 12px 32px;
    border-radius: 24px;
    font-size: 16px;
}

/* Confirm dialog */
.confirm-dialog {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.confirm-content {
    background: white;
    padding: 24px;
    border-radius: 12px;
    text-align: center;
    max-width: 320px;
}

.confirm-content p {
    margin-bottom: 20px;
    font-size: 16px;
}

.confirm-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.confirm-btn {
    padding: 10px 24px;
    background: var(--danger);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
}

/* Settings modal */
.settings-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.settings-content {
    background: white;
    padding: 24px;
    border-radius: 12px;
    max-width: 360px;
    width: 90%;
}

.settings-content h3 {
    margin-bottom: 8px;
    color: var(--dark-green);
}

.settings-desc {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 20px;
}

.setting-group {
    margin-bottom: 16px;
}

.setting-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.setting-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    cursor: pointer;
}

.setting-group select:focus {
    border-color: var(--primary-green);
}

.settings-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 20px;
}

.settings-actions .confirm-btn {
    background: var(--primary-green);
}

/* Ephemeral indicator */
.ephemeral-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: rgba(37, 211, 102, 0.2);
    color: var(--dark-green);
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 11px;
    margin-left: 8px;
}

.message.ephemeral {
    opacity: 0.9;
}

.message .ephemeral-timer {
    font-size: 10px;
    color: var(--text-light);
    display: block;
    margin-top: 2px;
}

/* Privacy alert */
.privacy-alert {
    text-align: center;
    padding: 12px 16px;
    margin: 8px auto;
    background: rgba(255, 82, 82, 0.9);
    color: white;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    max-width: 90%;
    animation: privacyPulse 0.5s ease-out;
}

@keyframes privacyPulse {
    0% { transform: scale(0.9); opacity: 0; }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); opacity: 1; }
}

/* Reply button */
.message {
    position: relative;
}

.reply-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.1);
    border: none;
    border-radius: 50%;
    width: 28px;
    height: 28px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.message.own .reply-btn {
    left: -36px;
}

.message.partner .reply-btn {
    right: -36px;
}

.message:hover .reply-btn {
    opacity: 1;
}

/* Reply quote in message */
.reply-quote {
    background: rgba(0, 0, 0, 0.08);
    border-left: 3px solid var(--dark-green);
    border-radius: 4px;
    padding: 6px 10px;
    margin-bottom: 6px;
    font-size: 12px;
    cursor: pointer;
}

.reply-quote.own {
    border-left-color: var(--dark-green);
}

.reply-quote.partner {
    border-left-color: var(--primary-green);
}

.reply-quote-label {
    display: block;
    font-weight: 600;
    color: var(--dark-green);
    margin-bottom: 2px;
}

.reply-quote-text {
    color: var(--text-light);
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 200px;
}

/* Reply preview above input */
#reply-preview {
    display: none;
    align-items: center;
    justify-content: space-between;
    background: white;
    border-left: 3px solid var(--primary-green);
    padding: 8px 12px;
    margin: 0;
    flex-shrink: 0;
}

.reply-preview-content {
    flex: 1;
    overflow: hidden;
}

.reply-preview-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-green);
}

.reply-preview-text {
    display: block;
    font-size: 13px;
    color: var(--text-light);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.reply-cancel {
    background: none;
    border: none;
    font-size: 18px;
    color: var(--text-light);
    cursor: pointer;
    padding: 4px 8px;
}

.reply-cancel:hover {
    color: var(--text-dark);
}

/* Responsive */
@media (max-width: 480px) {
    .landing-content {
        padding: 24px;
    }

    .emoji-grid {
        grid-template-columns: repeat(6, 1fr);
    }

    .message {
        max-width: 85%;
    }

    /* Reply button always visible on mobile */
    .reply-btn {
        opacity: 0.6;
    }

    .message.own .reply-btn {
        left: -32px;
    }

    .message.partner .reply-btn {
        right: -32px;
    }
}