/* ========================================
   Modern DiabeGuide UI - Health-Focused Design
   ======================================== */

:root {
    /* Modern Health-Focused Color Palette */
    --primary-color: #10b981;
    --primary-dark: #059669;
    --primary-light: #34d399;
    --secondary-color: #06b6d4;
    --accent-color: #8b5cf6;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    
    /* Neutral Colors */
    --bg-primary: #f0fdf4;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f9fafb;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --border-color: #e5e7eb;
    --border-light: #f3f4f6;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, #f0fdf4 0%, #ecfdf5 50%, #f0f9ff 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Container & Layout
   ======================================== */

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* ========================================
   Header & Navigation
   ======================================== */

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, #f9fafb 100%);
    border-bottom: 2px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(10px);
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
    letter-spacing: -0.02em;
}

.tabs {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.tab-link {
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    overflow: hidden;
}

.tab-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.tab-link:hover::before {
    left: 100%;
}

.tab-link:hover {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.tab-link.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.logout-link {
    background: linear-gradient(135deg, var(--danger-color) 0%, #dc2626 100%) !important;
    color: white !important;
}

.logout-link:hover {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%) !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   Main Content
   ======================================== */

main {
    padding-top: var(--spacing-md);
}

.tab-content {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    animation: fadeIn 0.4s ease-in-out;
}

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

.tab-content h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tab-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

/* ========================================
   Charts
   ======================================== */

.charts {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

/* ========================================
   Buttons
   ======================================== */

button, .btn {
    padding: 0.875rem 1.75rem;
    border: none;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

button::before, .btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

button:hover::before, .btn:hover::before {
    width: 300px;
    height: 300px;
}

button:hover, .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
}

button:active, .btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

#download-btn, #log-btn, #send-btn, #clear-data-btn, #history-btn {
    padding: 0.875rem 1.75rem;
    font-weight: 600;
}

#clear-data-btn {
    background: linear-gradient(135deg, var(--warning-color) 0%, #d97706 100%);
}

#clear-data-btn:hover {
    background: linear-gradient(135deg, #f59e0b 0%, var(--warning-color) 100%);
}

/* ========================================
   Forms
   ======================================== */

.input-form {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.input-form input {
    padding: 0.875rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    flex-grow: 1;
    min-width: 200px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
}

.input-form input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
    transform: translateY(-1px);
}

.input-form input::placeholder {
    color: var(--text-light);
}

/* ========================================
   Chat Interface
   ======================================== */

#chat-window-container {
    position: relative;
    margin-bottom: var(--spacing-md);
}

#chat-window {
    height: 500px;
    overflow-y: auto;
    border: 2px solid var(--border-light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    background: var(--bg-tertiary);
    scroll-behavior: smooth;
}

#chat-window::-webkit-scrollbar {
    width: 8px;
}

#chat-window::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

#chat-window::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: var(--radius-full);
}

#chat-window::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* ========================================
   Chat Controls
   ======================================== */



.control-btn:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
    opacity: 1;
}

.control-btn:active {
    transform: scale(0.95);
}



.message {
    margin-bottom: var(--spacing-md);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.bot-message p, .user-message p {
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg);
    display: inline-block;
    max-width: 75%;
    line-height: 1.6;
    word-wrap: break-word;
    box-shadow: var(--shadow-sm);
}

.bot-message p {
    background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
    color: var(--text-primary);
    border-top-left-radius: 4px;
}

.user-message {
    text-align: right;
}

.user-message p {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border-top-right-radius: 4px;
    margin-left: auto;
}

/* ========================================
   Quick Commands & Dropdowns
   ======================================== */

.quick-commands {
    margin-bottom: var(--spacing-md);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.quick-cmd, .emergency-btn, .dropbtn {
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--primary-color);
    background: var(--bg-secondary);
    color: var(--primary-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.quick-cmd:hover, .emergency-btn:hover, .dropbtn:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.emergency-btn[data-symptom="high"] {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.emergency-btn[data-symptom="high"]:hover {
    background: linear-gradient(135deg, var(--danger-color) 0%, #dc2626 100%);
    color: white;
}

.emergency-btn[data-symptom="low"] {
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.emergency-btn[data-symptom="low"]:hover {
    background: linear-gradient(135deg, var(--warning-color) 0%, #d97706 100%);
    color: white;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background: var(--bg-secondary);
    min-width: 200px;
    box-shadow: var(--shadow-xl);
    z-index: 1000;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    overflow: hidden;
    top: calc(100% + 2px);
    left: 0;
    animation: fadeIn 0.2s ease-out;
}

.dropdown-content.show,
.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-content a,
.dropdown-content button {
    color: var(--text-primary);
    padding: 1rem 1.25rem;
    text-decoration: none;
    display: block;
    transition: all 0.2s ease;
    font-weight: 500;
    border: none;
    background: transparent;
    width: 100%;
    text-align: left;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.95rem;
}

.dropdown-content a:hover,
.dropdown-content button:hover {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    color: white;
    padding-left: 1.5rem;
}

/* Keep dropdown open when hovering over content */
.dropdown-content:hover {
    display: block;
}

/* Ensure proper positioning */
.dropdown .dropbtn {
    margin-bottom: 0;
    position: relative;
}

/* ========================================
   Chat Input
   ======================================== */

.chat-input {
    display: flex;
    gap: var(--spacing-sm);
}

.chat-input input {
    flex-grow: 1;
    padding: 1rem 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
}

.chat-input input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.chat-input input::placeholder {
    color: var(--text-light);
}

.chat-input button {
    padding: 1rem 2rem;
    font-weight: 600;
    min-width: 120px;
}

/* ========================================
   Stop Generating Button
   ======================================== */

.chat-input-container {
    position: relative;
}

.stop-generating-container {
    display: none;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    animation: fadeIn 0.3s ease-in-out;
}

.stop-generating-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--bg-secondary);
    border: 2px solid var(--danger-color);
    border-radius: var(--radius-lg);
    color: var(--danger-color);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.stop-generating-btn:hover {
    background: linear-gradient(135deg, var(--danger-color) 0%, #dc2626 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stop-generating-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.stop-icon {
    font-size: 1.1rem;
    line-height: 1;
}

.stop-text {
    font-weight: 600;
}

/* ========================================
   Loading Indicator
   ======================================== */

.loading-indicator p {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-style: italic;
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.6;
    }
    50% {
        opacity: 1;
    }
}

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

/* ========================================
   Typing Cursor
   ======================================== */

.typing-cursor {
    display: inline-block;
    margin-left: 2px;
    color: inherit;
    font-weight: bold;
    animation: blink 1s infinite;
    vertical-align: baseline;
}

/* ========================================
   Flash Messages
   ======================================== */

.flashes {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--spacing-lg) 0;
}

.flashes li {
    padding: 1rem 1.5rem;
    margin-bottom: var(--spacing-sm);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    animation: slideDown 0.3s ease-out;
}

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

.flashes .info {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: #1e40af;
    border: 2px solid #93c5fd;
}

.flashes .error {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #991b1b;
    border: 2px solid #fca5a5;
}

.flashes .success {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: #065f46;
    border: 2px solid #6ee7b7;
}

/* ========================================
   Auth & Profile Forms
   ======================================== */

.auth-container, .profile-container {
    max-width: 500px;
    margin: var(--spacing-xl) auto;
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-light);
    animation: fadeIn 0.4s ease-in-out;
}

.auth-container h2, .profile-container h2 {
    margin-bottom: var(--spacing-lg);
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
}

.form-group {
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group input[type="number"],
.form-group input[type="month"],
.form-group select {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    box-sizing: border-box;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
}

.form-group input[type="text"]:focus,
.form-group input[type="password"]:focus,
.form-group input[type="email"]:focus,
.form-group input[type="number"]:focus,
.form-group input[type="month"]:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
    transform: translateY(-1px);
}

.form-group input[readonly] {
    background: var(--bg-tertiary);
    cursor: not-allowed;
    opacity: 0.7;
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2310b981' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.auth-container button, .profile-container button {
    width: 100%;
    padding: 1rem;
    margin-top: var(--spacing-md);
    font-size: 1.1rem;
    font-weight: 600;
}

.auth-container p, .profile-container p {
    margin-top: var(--spacing-lg);
    font-size: 0.95rem;
    color: var(--text-secondary);
    text-align: center;
}

.auth-container p a, .profile-container p a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
}

.auth-container p a:hover, .profile-container p a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ========================================
   Tracker Log
   ======================================== */

#tracker-log {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

/* ========================================
   Responsive Design
   ======================================== */

/* General rule for responsive images and media */
img, video, iframe {
    max-width: 100%;
    height: auto;
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .tabs {
        justify-content: center;
        width: 100%;
        gap: var(--spacing-xs); /* Tighter gap for tabs */
    }

    .tab-link {
        font-size: 0.85rem;
        padding: 0.625rem 1rem;
    }

    .tab-content {
        padding: var(--spacing-md);
    }

    .input-form {
        flex-direction: column;
    }

    .input-form input {
        width: 100%;
    }

    .chat-input {
        flex-direction: column;
    }

    .chat-input button {
        width: 100%;
    }

    #chat-window {
        height: 400px;
    }

    .bot-message p, .user-message p {
        max-width: 90%; /* Keep this as a cap for very long messages */
        width: fit-content; /* Make it shrink-wrap its content */
        width: -moz-fit-content; /* Firefox compatibility */
    }

    .quick-commands {
        justify-content: center;
    }

    .auth-container, .profile-container {
        padding: var(--spacing-lg);
        margin: var(--spacing-md) auto;
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-sm);
    }

    header {
        padding: var(--spacing-md);
    }

    header h1 {
        font-size: 1.5rem;
    }

    .tabs {
        flex-direction: column;
        align-items: stretch; /* Make tabs full-width */
        gap: var(--spacing-xs);
    }

    .tab-link {
        text-align: center; /* Center text in full-width tabs */
    }

    .tab-content {
        padding: var(--spacing-sm);
    }
    
    .tab-content h2 {
        font-size: 1.5rem;
    }

    .auth-container, .profile-container {
        padding: var(--spacing-md);
        box-shadow: none; /* Less emphasis on containers */
        border: none;
        background: transparent;
    }

    .bot-message p, .user-message p {
        max-width: 95%;
        width: fit-content; /* Make it shrink-wrap its content */
        width: -moz-fit-content; /* Firefox compatibility */
        font-size: 0.95rem;
    }
}

/* ========================================
   Utility Classes
   ======================================== */

.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }