/* 
=========================================================
Project: Lửng Code Office AI Add-ins
Description: Custom CSS for Lửng Code Landing Page
Theme: Flat, Modern, Dark Navy, Cyan, Tech
========================================================= 
*/

:root {
    --dark-navy: #0f172a; /* slate-900 */
    --dark-navy-light: #1e293b; /* slate-800 */
    --primary-blue: #3b82f6; /* blue-500 */
    --primary-cyan: #06b6d4; /* cyan-500 */
    --cyan-light: #cffafe; /* cyan-100 */
    --text-dark: #334155; /* slate-700 */
    --text-muted: #64748b; /* slate-500 */
    --bg-light: #f8fafc; /* slate-50 */
    --white: #ffffff;
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-light);
    overflow-x: hidden;
    scroll-behavior: smooth;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-light);
}
::-webkit-scrollbar-thumb {
    background: var(--dark-navy-light);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary-cyan);
}

/* Gradient Text Utilities */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Button Styling */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-cyan));
    color: var(--white);
    border: none;
    box-shadow: 0 4px 6px -1px rgba(6, 182, 212, 0.3), 0 2px 4px -1px rgba(6, 182, 212, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(6, 182, 212, 0.4), 0 4px 6px -2px rgba(6, 182, 212, 0.2);
    color: var(--white);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--white);
}

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

.btn-outline-dark:hover {
    background: var(--dark-navy);
    color: var(--white);
}

/* Navbar */
#navbar {
    transition: all 0.3s ease;
}
#navbar.scrolled {
    background: rgba(15, 23, 42, 0.95); /* dark-navy */
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Hero Section */
.hero-gradient {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
    position: relative;
    overflow: hidden;
}

/* Background grid effect for hero */
.bg-grid {
    position: absolute;
    inset: 0;
    background-size: 40px 40px;
    background-image: linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
                      linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    mask-image: linear-gradient(to bottom, black 40%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 40%, transparent 100%);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    background: rgba(6, 182, 212, 0.15);
    color: var(--cyan-light);
    border: 1px solid rgba(6, 182, 212, 0.3);
}

/* Cards */
.card-flat {
    background: var(--white);
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #e2e8f0;
}

.card-flat:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Feature Icons */
.feature-icon-wrapper {
    width: 3rem;
    height: 3rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.icon-word { background: #e0f2fe; color: #0284c7; }
.icon-ppt { background: #ffedd5; color: #ea580c; }
.icon-excel { background: #dcfce7; color: #16a34a; }

/* Pricing Card Highlights */
.pricing-card.popular {
    border: 2px solid var(--primary-cyan);
    position: relative;
    transform: scale(1.05);
    z-index: 10;
}

.pricing-card.popular .popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-cyan));
    color: white;
    padding: 0.25rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
}

@media (max-width: 1024px) {
    .pricing-card.popular {
        transform: scale(1);
    }
}

/* Step indicators */
.step-number {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background: var(--primary-cyan);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

/* Reveal Animation (Basic) */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}