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

:root {
    --ig-primary: #0095f6;
    --ig-secondary: #8e8e8e;
    --ig-border: #dbdbdb;
    --ig-bg: #ffffff;
    --ig-hover: #fafafa;
    --ig-text: #262626;
    --ig-text-light: #8e8e8e;
    --ig-blue-gradient: linear-gradient(45deg, #405de6, #5851db, #833ab4, #c13584, #e1306c, #fd1d1d);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--ig-bg);
    color: var(--ig-text);
    overflow: hidden;
}

/* 화면 전환 */
.screen {
    display: none;
    width: 100%;
    height: 100vh;
}

.screen.active {
    display: flex;
}

/* ===== 초기 설정 화면 ===== */
#setup-screen {
    justify-content: center;
    align-items: center;
    background: #fafafa;
}

.setup-container {
    background: white;
    border: 1px solid var(--ig-border);
    border-radius: 3px;
    padding: 40px;
    max-width: 400px;
    width: 100%;
}

.instagram-logo {
    text-align: center;
    margin-bottom: 30px;
    color: var(--ig-text);
}

.setup-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.input-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--ig-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input,
.input-group textarea {
    padding: 8px 12px;
    border: 1px solid var(--ig-border);
    border-radius: 3px;
    font-size: 14px;
    font-family: inherit;
    background: var(--ig-hover);
    transition: border-color 0.2s;
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--ig-secondary);
    background: white;
}

.input-group textarea {
    resize: vertical;
    min-height: 80px;
}

.input-group small {
    font-size: 11px;
    color: var(--ig-text-light);
}

.input-group small a {
    color: var(--ig-primary);
    text-decoration: none;
    font-weight: 600;
}

.input-group small a:hover {
    text-decoration: underline;
}

.btn-primary {
    background: var(--ig-primary);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 8px;
}

.btn-primary:hover {
    background: #1877f2;
}

.btn-primary:active {
    opacity: 0.7;
}

/* ===== 채팅 화면 ===== */
#chat-screen {
    justify-content: center;
    align-items: center;
}

.chat-container {
    width: 100%;
    max-width: 935px;
    height: 100vh;
    background: white;
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--ig-border);
    border-right: 1px solid var(--ig-border);
}

/* 헤더 - 인스타그램 스타일 */
.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--ig-border);
    background: white;
    min-height: 60px;
}

.back-btn {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: var(--ig-text);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
}

.back-btn:hover {
    opacity: 0.6;
}

.profile-section {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    flex: 1;
}

.profile-section:active {
    opacity: 0.6;
}

.profile-image {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--ig-blue-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
    padding: 2px;
}

.profile-image svg {
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    padding: 3px;
    color: var(--ig-text-light);
}

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

.profile-info h2 {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
    color: var(--ig-text);
}

.status {
    font-size: 12px;
    color: var(--ig-text-light);
}

.info-btn {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: var(--ig-text);
    display: flex;
    align-items: center;
    justify-content: center;
}

.info-btn:hover {
    opacity: 0.6;
}

/* 메시지 영역 */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: white;
}

.message {
    display: flex;
    gap: 8px;
    max-width: 75%;
    align-items: flex-end;
}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message.ai {
    align-self: flex-start;
}

.message-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--ig-blue-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 11px;
    font-weight: 600;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: var(--ig-text-light);
}

.message-content {
    padding: 12px 16px;
    border-radius: 22px;
    font-size: 14px;
    line-height: 1.4;
    word-wrap: break-word;
}

.message.user .message-content {
    background: var(--ig-primary);
    color: white;
}

.message.ai .message-content {
    background: var(--ig-border);
    color: var(--ig-text);
}

/* 타이핑 인디케이터 */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 8px 12px;
}

.typing-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--ig-text-light);
    animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        opacity: 0.3;
    }
    30% {
        opacity: 1;
    }
}

/* 입력 영역 - 인스타그램 스타일 */
.input-container {
    padding: 12px 20px;
    border-top: 1px solid var(--ig-border);
    display: flex;
    gap: 12px;
    align-items: center;
    background: white;
}

.icon-btn {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: var(--ig-text);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    opacity: 0.6;
}

.input-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    background: white;
    border: 1px solid var(--ig-border);
    border-radius: 22px;
    padding: 8px 16px;
}

#message-input {
    flex: 1;
    border: none;
    font-size: 14px;
    font-family: inherit;
    resize: none;
    max-height: 100px;
    overflow-y: auto;
    background: transparent;
}

#message-input:focus {
    outline: none;
}

#message-input::placeholder {
    color: var(--ig-text-light);
}

.send-btn {
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    color: var(--ig-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    transition: opacity 0.2s;
}

.send-btn:hover {
    opacity: 0.7;
}

.send-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* 모달 - 인스타그램 스타일 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.65);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--ig-border);
}

.modal-header h2 {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
    flex: 1;
    text-align: center;
}

.close-btn {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: var(--ig-text);
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    opacity: 0.6;
}

.save-btn-header {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: var(--ig-primary);
    font-size: 14px;
    font-weight: 600;
}

.save-btn-header:hover {
    opacity: 0.6;
}

.modal-body {
    padding: 24px 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.profile-edit-section {
    display: flex;
    justify-content: center;
    padding: 20px 0;
}

.profile-image-large {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--ig-blue-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    padding: 3px;
}

.profile-image-large svg {
    width: 50px;
    height: 50px;
    background: white;
    border-radius: 50%;
    padding: 10px;
    color: var(--ig-text-light);
}

/* 반응형 디자인 */
@media (max-width: 935px) {
    .chat-container {
        max-width: 100%;
        border-left: none;
        border-right: none;
    }
}

@media (max-width: 600px) {
    .setup-container {
        border: none;
        padding: 30px 20px;
    }

    .message {
        max-width: 85%;
    }

    .messages-container {
        padding: 16px;
    }

    .input-container {
        padding: 8px 12px;
    }

    .back-btn {
        margin-right: 8px;
    }
}

/* 스크롤바 스타일 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--ig-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--ig-secondary);
}

/* 애니메이션 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message {
    animation: fadeIn 0.3s ease-out;
}