:root {
    --primary-color: #2B65D9; /* Semi Design primary blue */
    --primary-dark: #1D4293;
    --accent-color: #FF4D4F; /* Semi Design red */
    --text-color: #1C1F23; /* Semi Design text color */
    --text-secondary: #4E5969; /* Semi Design secondary text */
    --light-bg: #F5F5F5;
    --card-bg: #FFFFFF;
    --border-color: #E5E6EB; /* Semi Design border color */
    --header-height: 60px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.06); /* Semi Design shadow */
    --border-radius: 6px; /* Semi Design border radius */
    --transition: all 0.2s cubic-bezier(0.34, 0.69, 0.1, 1); /* Semi Design transition */
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'IBM Plex Sans', Roboto, 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: var(--light-bg);
    color: var(--text-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--primary-color);
    color: white;
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 1000;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.header h1 {
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 600;
}

.search-container {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: white;
    padding: 12px 16px;
    box-shadow: var(--shadow);
    z-index: 999;
    transition: var(--transition);
    border-bottom: 1px solid var(--border-color);
}

.search-box {
    display: flex;
    gap: 12px;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

.input-wrapper {
    position: relative;
    flex: 1 1 auto;
    display: flex;
    align-items: center;
    min-width: 0;
    margin: 0 8px;
}

.clear-button {
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    padding: 4px;
    cursor: pointer;
    color: var(--text-secondary);
    display: none;
}

.clear-button:hover {
    color: var(--text-color);
}

.input-wrapper {
    position: relative;
    flex: 1 1 auto;
    display: flex;
    align-items: center;
    min-width: 0;
    margin: 0 8px;
}

.clear-button {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #666;
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 50%;
    display: none;
}

.clear-button:hover {
    background: rgba(0, 0, 0, 0.1);
}

.welcome-screen {
    text-align: center;
    padding: 40px 20px;
    display: none;
}

.welcome-screen.visible {
    display: block;
    animation: fadeIn 0.3s ease;
}

.welcome-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.welcome-screen h2 {
    color: var(--text-color);
    margin-bottom: 16px;
    font-size: 1.5rem;
}

.welcome-screen p {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.welcome-screen ul {
    list-style: none;
    padding: 0;
    margin: 0 0 24px 0;
}

.welcome-screen li {
    color: var(--text-color);
    margin: 8px 0;
    font-size: 0.95rem;
}

.welcome-tip {
    background: rgba(43, 101, 217, 0.1);
    padding: 12px;
    border-radius: var(--border-radius);
    display: inline-block;
}

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

.search-input {
    width: 100%;
    padding: 12px 16px;
    padding-right: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
    color: var(--text-color);
}

.search-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(43, 101, 217, 0.2);
}

.search-input::placeholder {
    color: #C1C7D0;
}

.search-button {
    padding: 12px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

.content {
    margin-top: calc(var(--header-height) + 70px);
    padding: 16px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.welcome-screen {
    display: none;
    text-align: center;
    padding: 40px 20px;
}

.welcome-screen.visible {
    display: block;
}

.welcome-content {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.welcome-content h2 {
    color: var(--primary-color);
    margin-bottom: 16px;
}

.welcome-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.search-tips {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.search-tips li {
    color: var(--text-color);
    padding: 8px;
    background: var(--background-light);
    border-radius: var(--border-radius);
}

.result-count {
    margin-bottom: 16px;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: var(--border-radius);
    background-color: rgba(43, 101, 217, 0.08);
    display: inline-block;
}

.reason-card {
    border-radius: var(--border-radius);
    padding: 16px;
    margin-bottom: 16px;
    background-color: var(--card-bg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
}

.reason-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.reason-code {
    font-weight: 600;
    color: var(--accent-color);
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.reason-name {
    font-weight: 600;
    margin-bottom: 12px;
    font-size: 1.2rem;
    color: var(--primary-dark);
}

.questions {
    margin-top: 12px;
}

.questions ul {
    padding-left: 20px;
}

.questions li {
    margin-bottom: 6px;
    color: var(--text-secondary);
}

.guidance {
    margin-top: 12px;
    padding: 12px;
    background-color: rgba(43, 101, 217, 0.06);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.symptoms {
    margin-top: 12px;
    font-size: 0.9em;
}

.symptom-tag {
    display: inline-block;
    margin-right: 6px;
    margin-bottom: 6px;
    padding: 4px 10px;
    background-color: rgba(43, 101, 217, 0.08);
    border-radius: 16px;
    font-size: 0.85rem;
    transition: var(--transition);
    color: var(--primary-color);
}

.symptom-tag:hover {
    background-color: rgba(43, 101, 217, 0.15);
}

.loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(43, 101, 217, 0.2);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.hidden {
    display: none;
}

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

/* Responsive styles */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1rem;
    }

    .search-button span {
        display: none;
    }

    .search-button:after {
        content: '🔍';
        font-size: 1.2rem;
    }

    .reason-card {
        padding: 14px;
    }

    .content {
        padding: 12px;
    }
}

/* Step screen styles */
.step-screen {
    display: none;
    flex-direction: column;
    min-height: 100vh;
    padding: 16px;
}

.step-screen.active {
    display: flex;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { transform: translateX(30px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.step-navigation {
    display: flex;
    gap: 12px;
    margin-top: auto;
    padding: 16px 0;
}

.step-btn {
    flex: 1;
    padding: 14px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    font-weight: 500;
}

.step-btn.primary {
    background-color: var(--primary-color);
    color: white;
    border-color: transparent;
}

@media (max-width: 480px) {
    .header {
        padding: 0 12px;
    }

    .search-input {
        padding: 10px 12px;
    }

    .search-button {
        padding: 10px 12px;
    }

    .reason-name {
        font-size: 1.1rem;
    }

    .reason-code {
        font-size: 1rem;
    }

    .guidance, .questions, .symptoms {
        font-size: 0.9rem;
    }

    .symptom-tag {
        padding: 3px 8px;
        font-size: 0.8rem;
    }

    .grid-container {
        grid-template-columns: 1fr;
    }

    .step-btn {
        padding: 12px;
        font-size: 0.9rem;
    }
}

/* Custom styles for fixed search header with home button */
.fixed-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: white;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    padding: 8px 16px;
    gap: 12px;
}

.fixed-header .home-button {
    font-size: 20px;
    text-decoration: none;
    color: var(--primary-color);
    margin-right: 12px;
    flex-shrink: 0;
}

.fixed-header .home-button:hover {
    color: var(--primary-dark);
}

.fixed-header .search-box {
    flex: 1;
    display: flex;
    gap: 8px;
}

.content {
    margin-top: 80px; /* push content below fixed header */
}

/* Fixed white search bar ontop */
.search-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background: var(--primary-color);
    z-index: 1000;
    box-shadow: var(--shadow);
    height: var(--header-height);
    margin: 0;
    width: 100%;
    max-width: 100%;
}

.home-btn {
    flex-shrink: 0;
    padding: 8px;
    margin-right: 8px;
}

.input-wrapper {
    position: relative;
    flex: 1 1 auto;
    display: flex;
    align-items: center;
    min-width: 0;
    margin: 0 8px;
    width: 100%;
    max-width: none;
}

.search-btn {
    flex-shrink: 0;
    white-space: nowrap;
}

.home-btn {
    font-size: 20px;
    text-decoration: none;
    cursor: pointer;
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid #ccc;
    font-size: 1rem;
}

.search-btn {
    padding: 8px 12px;
    font-size: 0.9rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.search-btn:hover {
    background-color: var(--primary-dark);
}

.content {
    margin-top: 80px;
    padding: 20px 16px;
}

/* New header search bar styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--primary-color);
    color: white;
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 1000;
    box-shadow: var(--shadow);
    max-width: 100%;
}

.header .nav-button {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 6px 12px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.header .nav-button:hover {
    background: rgba(255, 255, 255, 0.1);
}

.header .search-container {
    flex: 1;
    display: flex;
    gap: 8px;
    align-items: center;
    margin: 0 12px;
    max-width: 800px;
    width: 100%;

}

.header .search-input {
    width: 100%;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    border: 1px solid #ccc;
    font-size: 1rem;
    color: var(--text-color);
    min-width: 0;
    flex: 1;
}

.header .btn.btn-primary {
    padding: 8px 12px;
    font-size: 0.9rem;
    white-space: nowrap;
}