/*
 * TechLab247 Professional Theme
 * Color Palette: Modern Professional Teal
 *
 * Primary: Deep Teal (#0D9488)
 * Secondary: Slate Gray (#475569)
 * Accent: Emerald Green (#10B981)
 */

:root {
    /* ============================================
       PRIMARY COLORS
       ============================================ */
    --color-primary: #0D9488;           /* Deep Teal - Main brand color */
    --color-primary-dark: #0F766E;      /* Darker teal for hover states */
    --color-primary-light: #14B8A6;     /* Lighter teal for backgrounds */
    --color-primary-lighter: #CCFBF1;   /* Very light teal for subtle backgrounds */

    /* ============================================
       SECONDARY COLORS
       ============================================ */
    --color-secondary: #475569;         /* Slate Gray - Text and UI */
    --color-secondary-light: #64748B;   /* Lighter gray for secondary text */
    --color-secondary-dark: #334155;    /* Darker gray for emphasis */

    /* ============================================
       ACCENT COLORS
       ============================================ */
    --color-accent: #10B981;            /* Emerald Green - Success/highlights */
    --color-accent-dark: #059669;       /* Darker green for hover */
    --color-accent-light: #D1FAE5;      /* Light green for backgrounds */

    /* ============================================
       NEUTRAL COLORS
       ============================================ */
    --color-white: #FFFFFF;
    --color-black: #000000;
    --color-bg-light: #F8FAFC;          /* Slate-50 - Very light gray background */
    --color-bg-gray: #F1F5F9;           /* Slate-100 - Light gray background */
    --color-bg-darker: #E2E8F0;         /* Slate-200 - Slightly darker background */

    /* Text Colors */
    --color-text-primary: #1E293B;      /* Slate-800 - Main text */
    --color-text-secondary: #64748B;    /* Slate-500 - Secondary text */
    --color-text-muted: #94A3B8;        /* Slate-400 - Muted text */
    --color-text-light: #CBD5E1;        /* Slate-300 - Very light text */

    /* Border Colors */
    --color-border: #E2E8F0;            /* Slate-200 - Default borders */
    --color-border-dark: #CBD5E1;       /* Slate-300 - Darker borders */
    --color-border-light: #F1F5F9;      /* Slate-100 - Light borders */

    /* ============================================
       STATUS COLORS
       ============================================ */
    --color-success: #10B981;           /* Green - Success messages */
    --color-success-bg: #D1FAE5;        /* Light green background */
    --color-success-border: #6EE7B7;    /* Green border */

    --color-error: #EF4444;             /* Red - Error messages */
    --color-error-bg: #FEE2E2;          /* Light red background */
    --color-error-border: #FCA5A5;      /* Red border */

    --color-warning: #F59E0B;           /* Orange - Warning messages */
    --color-warning-bg: #FEF3C7;        /* Light orange background */
    --color-warning-border: #FCD34D;    /* Orange border */

    --color-info: #0D9488;              /* Teal - Info messages */
    --color-info-bg: #CCFBF1;           /* Light teal background */
    --color-info-border: #5EEAD4;       /* Teal border */

    /* ============================================
       SHADOWS
       ============================================ */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

    /* ============================================
       SPACING & LAYOUT
       ============================================ */
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;

    /* ============================================
       TRANSITIONS
       ============================================ */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
}

/* ============================================
   GLOBAL STYLES
   ============================================ */

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--color-text-primary);
    background-color: var(--color-bg-light);
    line-height: 1.6;
    padding-top: 76px;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-primary);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
    text-decoration: none;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    border-radius: var(--border-radius);
    padding: 0.625rem 1.25rem;
    font-weight: 500;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

/* Primary Button */
.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

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

/* Secondary Button */
.btn-secondary {
    background-color: var(--color-secondary);
    color: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background-color: var(--color-secondary-dark);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

/* Accent/Success Button */
.btn-success {
    background-color: var(--color-accent);
    color: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.btn-success:hover {
    background-color: var(--color-accent-dark);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

/* Outline Buttons */
.btn-outline-primary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-outline-primary:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-1px);
}

.btn-outline-secondary {
    background-color: transparent;
    color: var(--color-secondary);
    border: 2px solid var(--color-secondary);
}

.btn-outline-secondary:hover {
    background-color: var(--color-secondary);
    color: var(--color-white);
    transform: translateY(-1px);
}

/* Button Sizes */
.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.125rem;
}

/* ============================================
   CARDS
   ============================================ */

.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    background-color: var(--color-bg-gray);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    background-color: var(--color-bg-gray);
    border-top: 1px solid var(--color-border);
    padding: 1rem 1.5rem;
}

/* ============================================
   FORMS
   ============================================ */

.form-control {
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 0.625rem 1rem;
    font-size: 1rem;
    transition: all var(--transition-fast);
    background-color: var(--color-white);
    color: var(--color-text-primary);
}

.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-lighter);
    outline: none;
}

.form-control::placeholder {
    color: var(--color-text-muted);
}

.form-label {
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
    display: block;
}

.form-select {
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 0.625rem 1rem;
    background-color: var(--color-white);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-lighter);
    outline: none;
}

/* ============================================
   ALERTS & NOTIFICATIONS
   ============================================ */

.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--border-radius);
    border: 1px solid;
    margin-bottom: 1rem;
}

.alert-success {
    background-color: var(--color-success-bg);
    border-color: var(--color-success-border);
    color: var(--color-accent-dark);
}

.alert-error,
.alert-danger {
    background-color: var(--color-error-bg);
    border-color: var(--color-error-border);
    color: #991B1B;
}

.alert-warning {
    background-color: var(--color-warning-bg);
    border-color: var(--color-warning-border);
    color: #92400E;
}

.alert-info {
    background-color: var(--color-info-bg);
    border-color: var(--color-info-border);
    color: var(--color-primary-dark);
}

/* ============================================
   BADGES
   ============================================ */

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.badge-primary {
    background-color: var(--color-primary-lighter);
    color: var(--color-primary-dark);
}

.badge-success {
    background-color: var(--color-accent-light);
    color: var(--color-accent-dark);
}

.badge-secondary {
    background-color: var(--color-bg-darker);
    color: var(--color-secondary);
}

.badge-warning {
    background-color: var(--color-warning-bg);
    color: var(--color-warning);
}

.badge-error {
    background-color: var(--color-error-bg);
    color: var(--color-error);
}

/* ============================================
   NAVBAR (Enhanced)
   ============================================ */

.navbar {
    background-color: var(--color-white) !important;
    box-shadow: var(--shadow-sm);
    padding: 0.75rem 0;
    transition: all var(--transition-base);
    border-bottom: 1px solid var(--color-border);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--color-primary) !important;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand:hover {
    color: var(--color-primary-dark) !important;
}

.nav-link {
    color: var(--color-text-primary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    margin: 0 0.25rem;
}

.nav-link:hover {
    color: var(--color-primary) !important;
    background-color: var(--color-primary-lighter);
}

.nav-link.active {
    color: var(--color-primary) !important;
    background-color: var(--color-primary-lighter);
}

.dropdown-menu {
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    border-radius: var(--border-radius);
    padding: 0.5rem 0;
    margin-top: 0.5rem;
}

.dropdown-item {
    padding: 0.625rem 1.25rem;
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background-color: var(--color-primary-lighter);
    color: var(--color-primary);
}

.dropdown-divider {
    border-color: var(--color-border);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    background-color: var(--color-text-primary);
    color: var(--color-text-light);
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

.footer a {
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

.footer a:hover {
    color: var(--color-white);
}

.footer-heading {
    color: var(--color-white);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Background Colors */
.bg-primary { background-color: var(--color-primary) !important; }
.bg-secondary { background-color: var(--color-secondary) !important; }
.bg-accent { background-color: var(--color-accent) !important; }
.bg-light { background-color: var(--color-bg-light) !important; }
.bg-gray { background-color: var(--color-bg-gray) !important; }
.bg-white { background-color: var(--color-white) !important; }

/* Text Colors */
.text-primary { color: var(--color-primary) !important; }
.text-secondary { color: var(--color-text-secondary) !important; }
.text-accent { color: var(--color-accent) !important; }
.text-muted { color: var(--color-text-muted) !important; }
.text-dark { color: var(--color-text-primary) !important; }

/* Border Colors */
.border-primary { border-color: var(--color-primary) !important; }
.border-secondary { border-color: var(--color-secondary) !important; }
.border-light { border-color: var(--color-border) !important; }

/* Shadows */
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow { box-shadow: var(--shadow) !important; }
.shadow-md { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }
.shadow-xl { box-shadow: var(--shadow-xl) !important; }

/* Border Radius */
.rounded { border-radius: var(--border-radius) !important; }
.rounded-sm { border-radius: var(--border-radius-sm) !important; }
.rounded-lg { border-radius: var(--border-radius-lg) !important; }
.rounded-xl { border-radius: var(--border-radius-xl) !important; }

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
    h1 { font-size: 1.875rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }

    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9375rem;
    }

    .card-body {
        padding: 1rem;
    }

    body {
        padding-top: 70px;
    }
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

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

@keyframes slideIn {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}

.slide-in {
    animation: slideIn 0.3s ease-in-out;
}

/* ============================================
   LOADING STATES
   ============================================ */

.spinner {
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 0.8s linear infinite;
}

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

.spinner-sm {
    width: 20px;
    height: 20px;
    border-width: 2px;
}

/* ============================================
   PROGRESS BARS
   ============================================ */

.progress {
    background-color: var(--color-bg-gray);
    border-radius: 9999px;
    height: 8px;
    overflow: hidden;
}

.progress-bar {
    background-color: var(--color-primary);
    height: 100%;
    transition: width var(--transition-slow);
}

.progress-bar-success {
    background-color: var(--color-accent);
}

/* ============================================
   TOOL-SPECIFIC STYLES
   ============================================ */

.tool-card {
    border: 2px solid var(--color-border);
    transition: all var(--transition-base);
    cursor: pointer;
}

.tool-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.tool-icon {
    width: 48px;
    height: 48px;
    background-color: var(--color-primary-lighter);
    color: var(--color-primary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.tool-category-badge {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

/* ============================================
   FILE UPLOAD ZONE
   ============================================ */

.upload-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    background-color: var(--color-bg-light);
    transition: all var(--transition-base);
    cursor: pointer;
}

.upload-zone:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-lighter);
}

.upload-zone.dragover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-lighter);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 3rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .navbar,
    .footer,
    .btn,
    .alert {
        display: none !important;
    }

    body {
        padding-top: 0;
        background-color: white;
    }
}