/* ============================================================
   BASE & RESET
   ============================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: #f8f9fa;
    color: #191c1d;
    height: 100vh;
    overflow: hidden;
}

/* ============================================================
   APP CONTAINER
   ============================================================ */
.app-container {
    min-height: 100vh;
    background: #f8f9fa;
    display: flex;
    flex-direction: column;
}

/* ============================================================
   HEADER
   ============================================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: #002576;
    border-bottom: 1px solid #0038a8;
}

.header-content {
    max-width: 1024px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-icon {
    color: #ecc300;
    font-size: 22px;
}

.header-title {
    color: #dce1ff;
    font-size: 17px;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.clear-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border: 1px solid rgba(220, 225, 255, 0.25);
    border-radius: 20px;
    background: transparent;
    color: #dce1ff;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.clear-btn:hover {
    background: rgba(220, 225, 255, 0.12);
    border-color: rgba(220, 225, 255, 0.5);
}

/* ============================================================
   CHAT CONTAINER
   ============================================================ */
.chat-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 57px);
}

.messages-area {
    flex: 1;
    overflow-y: auto;
    background: #f8f9fa;
}

.messages-content {
    max-width: 1024px;
    margin: 0 auto;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    min-height: 100%;
}

/* ============================================================
   WELCOME SCREEN
   ============================================================ */
.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    height: 100%;
    min-height: 400px;
    padding: 40px 20px;
}

.welcome-icon {
    background: #002576;
    border-radius: 24px;
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: #ecc300;
    box-shadow: 0 4px 24px rgba(0, 37, 118, 0.18);
}

.welcome-title {
    color: #002576;
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 4px;
    line-height: 1.2;
}

.welcome-subtitle {
    color: #bb001e;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 14px;
}

.welcome-text {
    color: #444653;
    max-width: 480px;
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 28px;
}

.welcome-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    max-width: 520px;
}

.welcome-chip {
    background: #ffffff;
    border: 1px solid #c4c5d5;
    color: #002576;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.welcome-chip:hover {
    background: #002576;
    color: #dce1ff;
    border-color: #002576;
}

/* ============================================================
   MESSAGES CONTAINER
   ============================================================ */
.messages-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ============================================================
   MESSAGE STYLES
   ============================================================ */
.message {
    display: flex;
    width: 100%;
}

.message.user { justify-content: flex-end; }
.message.ai   { justify-content: flex-start; }

.message-wrapper {
    max-width: 560px;
    display: flex;
    flex-direction: column;
}

.message.user .message-wrapper { align-items: flex-end; }
.message.ai .message-wrapper   { align-items: flex-start; }

.message-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.message.user .message-header { flex-direction: row-reverse; }

.message-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: #bb001e;
    color: #ffffff;
}

.message.ai .message-avatar {
    background: #002576;
    color: #ecc300;
}

.message-info {
    display: flex;
    align-items: center;
    gap: 8px;
}

.message.user .message-info { flex-direction: row-reverse; }

.message-sender {
    color: #747685;
    font-size: 13px;
    font-weight: 600;
}

.message-model {
    background: #edeeef;
    color: #444653;
    border: 1px solid #c4c5d5;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 500;
}

.message-bubble {
    border-radius: 16px;
    padding: 14px 18px;
    word-wrap: break-word;
    max-width: 100%;
}

.message.user .message-bubble {
    background: #002576;
    color: #dce1ff;
    border-radius: 16px 16px 4px 16px;
}

.message.ai .message-bubble {
    background: #ffffff;
    border: 1px solid #e1e3e4;
    color: #191c1d;
    border-radius: 16px 16px 16px 4px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.message-text {
    white-space: pre-wrap;
    word-break: break-words;
    font-size: 14px;
    line-height: 1.75;
    font-style: italic;
}

.message.user .message-text {
    font-style: normal;
}

.message-footer {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 5px;
    font-size: 11px;
    color: #8e909f;
}

.message.user .message-footer { justify-content: flex-end; }
.message.ai  .message-footer  { justify-content: flex-start; }

/* ============================================================
   METER BADGES
   ============================================================ */
.meter-badge {
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
}

.meter-valid {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.meter-invalid {
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

/* ============================================================
   LOADING INDICATOR
   ============================================================ */
.loading-indicator {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.loading-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #002576;
    color: #ecc300;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.loading-bubble {
    background: #ffffff;
    border: 1px solid #e1e3e4;
    border-radius: 16px 16px 16px 4px;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.loading-dots {
    display: flex;
    gap: 4px;
}

.dot {
    width: 7px;
    height: 7px;
    background: #747685;
    border-radius: 50%;
    animation: pulse 1.4s ease-in-out infinite;
}

.dot:nth-child(2) { animation-delay: 0.2s; }
.dot:nth-child(3) { animation-delay: 0.4s; }

.loading-text {
    color: #747685;
    font-size: 13px;
    font-style: italic;
}

@keyframes pulse {
    0%, 80%, 100% { opacity: 0.25; transform: scale(0.9); }
    40%           { opacity: 1;    transform: scale(1.1); }
}

/* ============================================================
   INPUT AREA
   ============================================================ */
.input-area {
    border-top: 1px solid #e1e3e4;
    background: #ffffff;
}

.input-content {
    max-width: 1024px;
    margin: 0 auto;
    padding: 14px 24px 18px;
}

.chat-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.language-section {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 8px;
}

.language-label {
    color: #747685;
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
    letter-spacing: 0.02em;
}

.select-wrapper {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.select-wrapper::after {
    content: '';
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid #747685;
    pointer-events: none;
}

.language-select {
    height: 32px;
    background: #f3f4f5;
    border: 1px solid #c4c5d5;
    border-radius: 20px;
    color: #191c1d;
    padding: 0 28px 0 14px;
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    transition: all 0.2s ease;
}

.language-select:focus,
.language-select:hover {
    border-color: #002576;
    background: #ffffff;
}

.input-section {
    display: flex;
    align-items: flex-end;
    gap: 10px;
}

.textarea-container {
    flex: 1;
    position: relative;
}

.message-textarea {
    width: 100%;
    min-height: 46px;
    max-height: 128px;
    background: #f3f4f5;
    border: 1px solid #c4c5d5;
    border-radius: 24px;
    padding: 12px 18px;
    color: #191c1d;
    font-size: 14px;
    font-family: inherit;
    line-height: 1.4;
    resize: none;
    outline: none;
    transition: all 0.2s ease;
}

.message-textarea::placeholder { color: #8e909f; }

.message-textarea:focus {
    border-color: #002576;
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(0, 37, 118, 0.08);
}

.message-textarea:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.send-button {
    height: 46px;
    width: 46px;
    background: #002576;
    border: none;
    border-radius: 50%;
    color: #ffffff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
    position: relative;
    box-shadow: 0 2px 8px rgba(0, 37, 118, 0.25);
}

.send-button:hover:not(:disabled) {
    background: #0038a8;
    box-shadow: 0 4px 12px rgba(0, 37, 118, 0.35);
    transform: translateY(-1px);
}

.send-button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.loading-spinner { position: absolute; }

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid #ffffff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    0%   { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ============================================================
   SCROLLBAR
   ============================================================ */
.messages-area::-webkit-scrollbar { width: 5px; }
.messages-area::-webkit-scrollbar-track { background: transparent; }
.messages-area::-webkit-scrollbar-thumb { background: #c4c5d5; border-radius: 3px; }
.messages-area::-webkit-scrollbar-thumb:hover { background: #747685; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
    .header-content   { padding: 12px 16px; }
    .messages-content { padding: 16px; gap: 20px; }
    .message-wrapper  { max-width: 88%; }
    .input-content    { padding: 12px 16px 16px; }
    .language-section { flex-direction: row; }
}

@media (max-width: 480px) {
    .header-title   { font-size: 15px; }
    .welcome-title  { font-size: 22px; }
    .message-wrapper { max-width: 92%; }
    .message-bubble  { padding: 11px 14px; }
    .welcome-chips  { gap: 6px; }
    .welcome-chip   { font-size: 12px; padding: 5px 12px; }
}