/* =====================================================
   INTRODUCTION PAGE - Premium Edition
   ===================================================== */

/* ── Hero ─────────────────────────────────────────────── */
.intro-hero {
    background: linear-gradient(160deg, #0f0102 0%, #3d0709 25%, #9b181d 70%, #c12026 100%);
    padding: 110px 0;
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.intro-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
    background-size: 40px 40px;
}
.intro-hero::after {
    content: 'PTIT';
    position: absolute;
    right: -40px;
    bottom: -50px;
    font-size: 220px;
    font-weight: 900;
    color: rgba(255,255,255,.035);
    line-height: 1;
    user-select: none;
}

.intro-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.2);
    padding: 6px 20px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1.2px;
    text-transform: uppercase;
    color: rgba(255,255,255,.9);
    margin-bottom: 28px;
    backdrop-filter: blur(8px);
    position: relative;
    z-index: 1;
}
.intro-hero h1 {
    font-size: 54px;
    font-weight: 900;
    margin-bottom: 18px;
    letter-spacing: -1.5px;
    line-height: 1.1;
    position: relative;
    z-index: 1;
}
.intro-hero p {
    font-size: 18px;
    opacity: .78;
    max-width: 580px;
    margin: 0 auto 40px;
    line-height: 1.75;
    position: relative;
    z-index: 1;
}

/* ── Buttons ─────────────────────────────────────────── */
.btn-white-primary {
    background: #fff;
    color: var(--primary);
    padding: 14px 30px;
    border-radius: var(--radius);
    font-weight: 800;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: all .25s cubic-bezier(.4,0,.2,1);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,.2);
    position: relative;
    z-index: 1;
}
.btn-white-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0,0,0,.3);
    color: var(--primary);
    background: #fff;
}

.btn-outline-white {
    background: transparent;
    color: rgba(255,255,255,.88);
    padding: 14px 26px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 15px;
    border: 1.5px solid rgba(255,255,255,.3);
    cursor: pointer;
    transition: all .25s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    position: relative;
    z-index: 1;
    backdrop-filter: blur(4px);
}
.btn-outline-white:hover {
    background: rgba(255,255,255,.12);
    color: #fff;
    border-color: rgba(255,255,255,.6);
    transform: translateY(-2px);
}

/* ── Feature Cards ───────────────────────────────────── */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.feature-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 36px 28px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
    animation: fadeUp .6s ease both;
}
.feature-card:nth-child(2) { animation-delay: .1s; }
.feature-card:nth-child(3) { animation-delay: .2s; }
.feature-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), #e83e3e);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-slow);
}
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(193,32,38,.18);
}
.feature-card:hover::before { transform: scaleX(1); }

.feature-tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--primary), #e83e3e);
    color: #fff;
    border-radius: var(--radius-lg);
    font-size: 14px;
    font-weight: 900;
    letter-spacing: .5px;
    text-transform: uppercase;
    margin-bottom: 22px;
    box-shadow: var(--shadow-primary-sm);
    transition: all var(--transition);
}
.feature-card:hover .feature-tag { transform: scale(1.1) rotate(-5deg); box-shadow: var(--shadow-primary); }
.feature-card h3 { font-size: 17px; font-weight: 800; color: var(--text-1); margin-bottom: 12px; letter-spacing: -.2px; }
.feature-card p  { font-size: 14px; color: var(--text-3); line-height: 1.75; }

/* ── Stats Banner ────────────────────────────────────── */
.stats-banner {
    background: linear-gradient(135deg, #110102 0%, #4d0a0d 40%, #9b181d 80%, #c12026 100%);
    border-radius: var(--radius-2xl);
    padding: 60px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(193,32,38,.3);
}
.stats-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
    background-size: 32px 32px;
}
.stats-banner .sn {
    font-size: 44px;
    font-weight: 900;
    color: #fcd34d;
    margin-bottom: 8px;
    letter-spacing: -1.5px;
    line-height: 1;
}
.stats-banner .sl { font-size: 14px; opacity: .75; font-weight: 500; letter-spacing: .02em; }

/* ── How it works ────────────────────────────────────── */
.how-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}
.timeline { display: flex; flex-direction: column; gap: 24px; margin-top: 32px; }
.timeline-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    transition: transform var(--transition);
}
.timeline-item:hover { transform: translateX(4px); }
.timeline-step {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary), #e83e3e);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    font-weight: 900;
    flex-shrink: 0;
    box-shadow: var(--shadow-primary-sm);
}
.timeline-title { font-size: 16px; font-weight: 700; color: var(--text-1); margin-bottom: 5px; }
.timeline-desc  { font-size: 14px; color: var(--text-3); line-height: 1.65; }

.ai-showcase {
    background: linear-gradient(135deg, #110102 0%, #4d0a0d 40%, #c12026 100%);
    border-radius: var(--radius-xl);
    padding: 52px 44px;
    color: #fff;
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(193,32,38,.3);
}
.ai-showcase::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
    background-size: 32px 32px;
}
.ai-showcase-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(255,255,255,.15);
    border: 1px solid rgba(255,255,255,.2);
    padding: 5px 16px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 22px;
    position: relative;
    z-index: 1;
    backdrop-filter: blur(4px);
}
.ai-showcase h3 { font-size: 26px; font-weight: 800; margin-bottom: 14px; line-height: 1.3; position: relative; z-index: 1; }
.ai-showcase p  { font-size: 15px; opacity: .78; line-height: 1.75; position: relative; z-index: 1; }

/* ── Features Overview Grid ───────────────────────────── */
.features-overview-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.feature-overview-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.feature-overview-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}
.f-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .8px;
    margin-bottom: 16px;
    border: 1px solid rgba(122, 19, 24, 0.15);
    text-transform: uppercase;
}
.feature-overview-card h3 {
    font-size: 18px;
    font-weight: 800;
    color: var(--text-1);
    margin-bottom: 10px;
}
.feature-overview-card p {
    font-size: 14px;
    color: var(--text-3);
    line-height: 1.7;
    text-align: justify;
    text-justify: inter-word;
    margin: 0;
    width: 100%;
}

/* ── Responsive ─────────────────────────────────────── */
@media (max-width: 900px) {
    .features-overview-grid { grid-template-columns: 1fr; }
    .feature-grid { grid-template-columns: 1fr; }
    .stats-banner { grid-template-columns: repeat(2, 1fr); padding: 40px 28px; border-radius: var(--radius-xl); }
    .how-grid { grid-template-columns: 1fr; gap: 40px; }
    .intro-hero h1 { font-size: 38px; }
    .intro-hero p  { font-size: 16px; }
}
@media (max-width: 480px) {
    .intro-hero { padding: 72px 0; }
    .intro-hero h1 { font-size: 30px; }
    .stats-banner { grid-template-columns: 1fr 1fr; }
}