/*
    Voice Cloning Dataset - Custom Styles
    Developer: Molla Samser
    Email: help@rskworld.in
    Phone: +91 93305 39277
    Website: https://rskworld.in
    Year: 2026
*/

/* ============================================
   CSS Variables & Root Styles
   ============================================ */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --gradient-start: #667eea;
    --gradient-end: #764ba2;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-bg: #f8f9fa;
    --dark-text: #212529;
    --border-radius: 15px;
    --box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    --box-shadow-hover: 0 15px 50px rgba(0,0,0,0.3);
    --transition: all 0.3s ease;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
}

/* ============================================
   Global Styles & Reset
   ============================================ */
* {
    scroll-behavior: smooth;
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    background-attachment: fixed;
    min-height: 100vh;
    padding-top: 70px;
    margin: 0;
    color: var(--dark-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

@media (max-width: 575.98px) {
    body {
        padding-top: 65px;
    }
}

/* ============================================
   Navigation Bar
   ============================================ */
.navbar {
    background: rgba(255, 255, 255, 0.98) !important;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    box-shadow: 0 2px 25px rgba(0,0,0,0.08);
    padding: 12px 0;
    transition: var(--transition);
    min-height: 70px;
    border-bottom: 1px solid rgba(102, 126, 234, 0.1);
}

.navbar.scrolled {
    box-shadow: 0 4px 35px rgba(0,0,0,0.12);
    padding: 10px 0;
    background: rgba(255, 255, 255, 0.99) !important;
}

.navbar .container-fluid {
    max-width: 1400px;
}

.navbar-brand {
    font-weight: 700;
    color: var(--gradient-start) !important;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: var(--transition);
    padding: 8px 0;
    text-decoration: none;
}

.navbar-brand:hover {
    color: var(--gradient-end) !important;
    transform: translateY(-2px);
}

.navbar-brand i {
    font-size: 1.8rem;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: var(--transition);
}

.navbar-brand:hover i {
    transform: rotate(15deg) scale(1.1);
}

.brand-text {
    font-weight: 700;
    letter-spacing: -0.5px;
}

.nav-link {
    color: #333 !important;
    font-weight: 500;
    margin: 0 5px;
    padding: 10px 16px !important;
    border-radius: 10px;
    transition: var(--transition);
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    white-space: nowrap;
}

.nav-link i {
    font-size: 1rem;
    width: 18px;
    text-align: center;
    transition: var(--transition);
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 50%;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    transition: var(--transition);
    transform: translateX(-50%);
    border-radius: 2px;
}

.nav-link:hover::before {
    width: 70%;
}

.nav-link:hover {
    color: var(--gradient-start) !important;
    background: rgba(102, 126, 234, 0.08);
    transform: translateY(-2px);
}

.nav-link:hover i {
    transform: scale(1.2);
    color: var(--gradient-start);
}

.nav-link.active {
    color: var(--gradient-start) !important;
    background: rgba(102, 126, 234, 0.1);
    font-weight: 600;
}

.nav-link.active::before {
    width: 70%;
}

.nav-text {
    display: inline-block;
}

.contact-info-nav {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white !important;
    padding: 10px 20px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    margin-left: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    white-space: nowrap;
}

.contact-info-nav::before {
    display: none;
}

.contact-info-nav:hover {
    color: white !important;
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
    background: linear-gradient(135deg, var(--gradient-end) 0%, var(--gradient-start) 100%);
}

.contact-info-nav i {
    font-size: 1rem;
}

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

.navbar-toggler {
    border: 2px solid var(--gradient-start);
    border-radius: 8px;
    padding: 6px 10px;
    transition: var(--transition);
    background: transparent;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
    outline: none;
}

.navbar-toggler:hover {
    background: rgba(102, 126, 234, 0.1);
    border-color: var(--gradient-end);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(102, 126, 234, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    width: 24px;
    height: 24px;
}

/* Mobile Menu Styles */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background: white;
        margin-top: 15px;
        padding: 20px;
        border-radius: 12px;
        box-shadow: 0 8px 30px rgba(0,0,0,0.1);
        border: 1px solid rgba(102, 126, 234, 0.1);
    }

    .navbar-nav {
        gap: 5px;
    }

    .nav-link {
        margin: 5px 0;
        padding: 12px 15px !important;
        border-radius: 10px;
        width: 100%;
        justify-content: flex-start;
    }

    .nav-link:hover {
        background: rgba(102, 126, 234, 0.1);
        transform: translateX(5px);
    }

    .contact-info-nav {
        margin-left: 0;
        margin-top: 10px;
        width: 100%;
        justify-content: center;
        padding: 12px 20px;
    }

    .brand-text {
        font-size: 1.2rem;
    }

    .navbar-brand {
        font-size: 1.2rem;
    }
}

/* Extra Small Devices */
@media (max-width: 575.98px) {
    .navbar {
        padding: 10px 0;
        min-height: 65px;
    }

    .navbar-brand {
        font-size: 1.1rem;
        gap: 8px;
    }

    .navbar-brand i {
        font-size: 1.5rem;
    }

    .brand-text {
        font-size: 1rem;
    }

    .contact-text {
        font-size: 0.85rem;
    }

    .nav-link {
        font-size: 0.9rem;
        padding: 10px 12px !important;
    }

    .contact-info-nav {
        font-size: 0.9rem;
        padding: 10px 16px;
    }
}

/* Active Navigation Link */
.nav-link[href="#home"].active,
.nav-link[href="#features"].active,
.nav-link[href="#stats"].active,
.nav-link[href="#advanced"].active,
.nav-link[href="#dataset-preview"].active,
.nav-link[href="#code-examples"].active,
.nav-link[href="#faq"].active {
    color: var(--gradient-start) !important;
    background: rgba(102, 126, 234, 0.1);
    font-weight: 600;
}

.nav-link[href="#home"].active::before,
.nav-link[href="#features"].active::before,
.nav-link[href="#stats"].active::before,
.nav-link[href="#advanced"].active::before,
.nav-link[href="#dataset-preview"].active::before,
.nav-link[href="#code-examples"].active::before,
.nav-link[href="#faq"].active::before {
    width: 70%;
}

/* ============================================
   Main Container
   ============================================ */
.project-container {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 40px;
    margin: 20px auto;
    max-width: 1400px;
    position: relative;
    overflow: hidden;
}

.project-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
}

/* ============================================
   Header Section
   ============================================ */
.project-header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 3px solid var(--primary-color);
    position: relative;
}

.project-header::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: var(--gradient-start);
    border-radius: 2px;
}

.project-icon {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    animation: pulse 2s infinite;
    display: inline-block;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.1));
}

@keyframes pulse {
    0%, 100% { 
        transform: scale(1);
        opacity: 1;
    }
    50% { 
        transform: scale(1.1);
        opacity: 0.9;
    }
}

.display-4 {
    font-weight: 700;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 20px 0;
}

.lead {
    font-size: 1.25rem;
    font-weight: 400;
    color: #6c757d;
}

.difficulty-badge {
    display: inline-block;
    padding: 10px 20px;
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
    color: white;
    border-radius: 25px;
    font-weight: bold;
    margin: 10px 0;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
    transition: var(--transition);
}

.difficulty-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

/* ============================================
   Section Titles
   ============================================ */
.section-title {
    color: var(--gradient-start);
    font-weight: 700;
    margin: 30px 0 20px 0;
    padding-bottom: 10px;
    border-bottom: 3px solid var(--gradient-start);
    position: relative;
    font-size: 1.75rem;
}

.section-title::before {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--gradient-end);
    border-radius: 2px;
}

.section-title i {
    margin-right: 10px;
    color: var(--gradient-start);
}

/* ============================================
   Technology Badges
   ============================================ */
.tech-badge {
    display: inline-block;
    padding: 10px 18px;
    margin: 8px 5px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    box-shadow: 0 4px 10px rgba(102, 126, 234, 0.2);
    cursor: pointer;
}

.tech-badge:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.3);
}

.tech-badge i {
    margin-right: 5px;
}

/* ============================================
   Feature Cards
   ============================================ */
.feature-card {
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    padding: 25px;
    margin: 15px 0;
    transition: var(--transition);
    height: 100%;
    background: white;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--box-shadow-hover);
    border-color: var(--gradient-start);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--gradient-start);
    margin-bottom: 15px;
    display: inline-block;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.2) rotate(5deg);
    color: var(--gradient-end);
}

.feature-card h5 {
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--dark-text);
}

.feature-card p {
    color: #6c757d;
    margin: 0;
    line-height: 1.6;
}

/* ============================================
   Statistics Cards
   ============================================ */
.stats-card {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    border-radius: var(--border-radius);
    padding: 30px 25px;
    text-align: center;
    margin: 10px;
    transition: var(--transition);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
    position: relative;
    overflow: hidden;
}

.stats-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    transition: var(--transition);
}

.stats-card:hover::before {
    top: -30%;
    right: -30%;
}

.stats-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.4);
}

.stats-card i {
    font-size: 2.5rem;
    margin-bottom: 15px;
    opacity: 0.9;
    display: block;
}

.stats-number {
    font-size: 2.8rem;
    font-weight: 700;
    margin: 15px 0;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.stats-card > div:last-child {
    font-size: 1.1rem;
    font-weight: 500;
    opacity: 0.95;
}

/* ============================================
   Buttons
   ============================================ */
.btn-download {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    padding: 14px 35px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 30px;
    color: white;
    transition: var(--transition);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.3);
    position: relative;
    overflow: hidden;
}

.btn-download::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;
}

.btn-download:hover::before {
    width: 300px;
    height: 300px;
}

.btn-download:hover {
    transform: translateY(-3px) scale(1.05);
    color: white;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn-download:active {
    transform: translateY(-1px) scale(1.02);
}

/* ============================================
   Contact Section
   ============================================ */
.contact-section {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: var(--border-radius);
    padding: 35px;
    margin: 30px 0;
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.contact-item {
    display: flex;
    align-items: center;
    margin: 15px 0;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: var(--transition);
    border-left: 4px solid var(--gradient-start);
}

.contact-item:hover {
    transform: translateX(5px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.12);
    border-left-width: 6px;
}

.contact-icon {
    font-size: 2.2rem;
    color: var(--gradient-start);
    margin-right: 20px;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-radius: 12px;
    transition: var(--transition);
}

.contact-item:hover .contact-icon {
    transform: scale(1.1) rotate(5deg);
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
}

.contact-item strong {
    display: block;
    margin-bottom: 5px;
    color: var(--dark-text);
    font-weight: 600;
}

.contact-item a {
    color: var(--gradient-start);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

.contact-item a:hover {
    color: var(--gradient-end);
    text-decoration: underline;
}

/* ============================================
   Audio Preview
   ============================================ */
.audio-preview {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 12px;
    padding: 25px;
    margin: 20px 0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    border: 2px solid #e0e0e0;
}

.audio-preview audio {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* ============================================
   Advanced Features
   ============================================ */
.advanced-feature {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    border-radius: 12px;
    padding: 25px;
    margin: 15px 0;
    box-shadow: 0 6px 20px rgba(245, 87, 108, 0.3);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.advanced-feature::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    transition: var(--transition);
}

.advanced-feature:hover::before {
    top: -30%;
    right: -30%;
}

.advanced-feature:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(245, 87, 108, 0.4);
}

.advanced-feature h5 {
    font-weight: 600;
    margin-bottom: 10px;
}

.advanced-feature i {
    margin-right: 10px;
    font-size: 1.3rem;
}

/* ============================================
   Progress Bars
   ============================================ */
.progress {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.1);
    background: #e9ecef;
}

.progress-bar-custom {
    background: linear-gradient(90deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    height: 25px;
    border-radius: 15px;
    transition: width 1s ease-in-out;
    box-shadow: 0 2px 10px rgba(102, 126, 234, 0.3);
    position: relative;
    overflow: hidden;
}

.progress-bar-custom::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ============================================
   FAQ Items
   ============================================ */
.faq-item {
    margin: 15px 0;
    padding: 25px;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: 12px;
    border-left: 5px solid var(--gradient-start);
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: var(--transition);
}

.faq-item:hover {
    transform: translateX(5px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.12);
    border-left-width: 6px;
}

.faq-item h5 {
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--dark-text);
}

.faq-item h5 i {
    color: var(--gradient-start);
    margin-right: 8px;
}

.faq-item p {
    color: #6c757d;
    margin: 0;
    line-height: 1.7;
}

.faq-item code {
    background: #f1f3f5;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--gradient-start);
    font-weight: 500;
}

/* ============================================
   Social Share Buttons
   ============================================ */
.social-share {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin: 25px 0;
    flex-wrap: wrap;
}

.social-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    position: relative;
    overflow: hidden;
}

.social-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 0.4s, height 0.4s;
}

.social-btn:hover::before {
    width: 100px;
    height: 100px;
}

.social-btn:hover {
    transform: translateY(-5px) scale(1.15);
    color: white;
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.social-fb { background: #3b5998; }
.social-twitter { background: #1da1f2; }
.social-linkedin { background: #0077b5; }
.social-whatsapp { background: #25d366; }

/* ============================================
   Quick Contact Button
   ============================================ */
.quick-contact-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    border: none;
    border-radius: 50px;
    padding: 15px 25px;
    font-size: 1.1rem;
    font-weight: 600;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
    z-index: 1000;
    transition: var(--transition);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.quick-contact-btn:hover {
    transform: scale(1.1) translateY(-5px);
    color: white;
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.5);
}

/* ============================================
   Tables
   ============================================ */
.table {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
}

.table thead th {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    font-weight: 600;
    border: none;
    padding: 15px;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.table tbody tr {
    transition: var(--transition);
}

.table tbody tr:hover {
    background: rgba(102, 126, 234, 0.05);
    transform: scale(1.01);
}

.table tbody td {
    padding: 15px;
    vertical-align: middle;
    border-color: #e9ecef;
}

/* ============================================
   Cards
   ============================================ */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
    transform: translateY(-3px);
}

.card-body {
    padding: 25px;
}

.card-title {
    font-weight: 600;
    color: var(--dark-text);
    margin-bottom: 15px;
}

/* ============================================
   Chart Cards & Containers
   ============================================ */
.chart-card {
    height: 100%;
    border: 2px solid #f0f0f0;
    transition: var(--transition);
}

.chart-card:hover {
    border-color: var(--gradient-start);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.15);
}

.chart-container {
    position: relative;
    height: 300px;
    width: 100%;
    margin: 15px 0;
}

.chart-container-large {
    position: relative;
    height: 400px;
    width: 100%;
    margin: 15px 0;
}

.chart-card .card-title {
    display: flex;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gradient-start);
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
}

.chart-card .card-title i {
    font-size: 1.3rem;
    margin-right: 10px;
}

/* ============================================
   Forms & Inputs
   ============================================ */
.form-control,
.form-select {
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    padding: 10px 15px;
    transition: var(--transition);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--gradient-start);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.15);
    outline: none;
}

/* ============================================
   Alerts
   ============================================ */
.alert {
    border-radius: 12px;
    border: none;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    padding: 20px;
}

.alert-info {
    background: linear-gradient(135deg, #d1ecf1 0%, #bee5eb 100%);
    color: #0c5460;
}

.alert-link {
    color: var(--gradient-start);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.alert-link:hover {
    color: var(--gradient-end);
    text-decoration: underline;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    text-align: center;
    margin-top: 50px;
    padding-top: 30px;
    border-top: 2px solid #e0e0e0;
    color: #6c757d;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: 12px;
    padding: 30px;
}

.footer p {
    margin: 10px 0;
}

.footer a {
    color: var(--gradient-start);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.footer a:hover {
    color: var(--gradient-end);
    text-decoration: underline;
}

/* ============================================
   Code Blocks
   ============================================ */
pre {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
}

pre code {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ============================================
   Accordion
   ============================================ */
.accordion-item {
    border: none;
    margin-bottom: 10px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.accordion-button {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border: none;
    font-weight: 600;
    color: var(--dark-text);
    padding: 20px;
}

.accordion-button:not(.collapsed) {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: 0 0 0 0.25rem rgba(102, 126, 234, 0.15);
}

.accordion-body {
    padding: 25px;
    background: white;
}

/* ============================================
   Tabs
   ============================================ */
.nav-tabs {
    border-bottom: 2px solid #e0e0e0;
    margin-bottom: 20px;
}

.nav-tabs .nav-link {
    border: none;
    border-radius: 8px 8px 0 0;
    color: #6c757d;
    font-weight: 500;
    transition: var(--transition);
}

.nav-tabs .nav-link:hover {
    border-color: transparent;
    background: rgba(102, 126, 234, 0.1);
    color: var(--gradient-start);
}

.nav-tabs .nav-link.active {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    border: none;
}

/* ============================================
   Responsive Design - Mobile First
   ============================================ */

/* Extra Small Devices (phones, 576px and down) */
@media (max-width: 575.98px) {
    html {
        font-size: 14px;
    }

    body {
        padding-top: 70px;
    }

    .project-container {
        padding: 20px;
        margin: 10px;
        border-radius: 10px;
    }

    .project-icon {
        font-size: 3rem;
    }

    .display-4 {
        font-size: 2rem;
    }

    .lead {
        font-size: 1rem;
    }

    .navbar-brand {
        font-size: 1.2rem;
    }

    .nav-link {
        margin: 5px 0;
        padding: 10px !important;
    }

    .contact-info-nav {
        padding: 6px 12px;
        font-size: 0.85rem;
        margin-top: 10px;
    }

    .stats-card {
        padding: 20px 15px;
        margin: 8px 5px;
    }

    .stats-number {
        font-size: 2rem;
    }

    .stats-card i {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.5rem;
        margin: 20px 0 15px 0;
    }

    .feature-card {
        padding: 20px;
        margin: 10px 0;
    }

    .tech-badge {
        padding: 8px 12px;
        font-size: 0.8rem;
        margin: 5px 3px;
    }

    .btn-download {
        padding: 12px 25px;
        font-size: 1rem;
        width: 100%;
        margin-bottom: 10px;
    }

    .contact-section {
        padding: 20px;
    }

    .contact-item {
        padding: 15px;
        flex-direction: column;
        text-align: center;
    }

    .contact-icon {
        margin-right: 0;
        margin-bottom: 10px;
    }

    .quick-contact-btn {
        bottom: 20px;
        right: 20px;
        padding: 12px 20px;
        font-size: 0.9rem;
    }

.quick-contact-btn span {
    display: inline;
}

@media (max-width: 575.98px) {
    .quick-contact-btn span {
        display: none;
    }
}

    .social-btn {
        width: 40px;
        height: 40px;
    }

    .table {
        font-size: 0.85rem;
    }

    .table thead th,
    .table tbody td {
        padding: 10px 8px;
    }

    .card-body {
        padding: 15px;
    }

    .alert {
        padding: 15px;
        flex-direction: column;
        text-align: center;
    }

    .advanced-feature {
        padding: 20px;
    }

    .chart-container {
        height: 250px;
    }

    .chart-container-large {
        height: 300px;
    }

    .chart-card .card-title {
        font-size: 1rem;
    }
}

/* Small Devices (landscape phones, 576px and up) */
@media (min-width: 576px) and (max-width: 767.98px) {
    .project-container {
        padding: 30px;
    }

    .stats-card {
        margin: 10px 5px;
    }

    .btn-download {
        width: auto;
        margin: 5px;
    }
}

/* Medium Devices (tablets, 768px and up) */
@media (min-width: 768px) and (max-width: 991.98px) {
    .project-container {
        padding: 35px;
    }

    .stats-card {
        margin: 10px;
    }

    .contact-item {
        flex-direction: row;
    }

    .contact-icon {
        margin-right: 20px;
        margin-bottom: 0;
    }
}

/* Large Devices (desktops, 992px and up) */
@media (min-width: 992px) {
    .project-container {
        padding: 40px;
    }
}

/* Extra Large Devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .project-container {
        max-width: 1400px;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
        padding-top: 0;
    }

    .navbar,
    .quick-contact-btn,
    .social-share {
        display: none;
    }

    .project-container {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* ============================================
   Accessibility
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 3px solid var(--gradient-start);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .feature-card,
    .stats-card,
    .advanced-feature {
        border: 2px solid currentColor;
    }
}