/* ============================================================
   ComfyLearn Frontend Revamp — Design System & Utilities
   ============================================================ */

/* --- Custom Properties --- */
:root {
    --cl-primary: #164085;
    --cl-primary-light: #1a5bc4;
    --cl-primary-rgb: 22, 64, 133;
    --cl-accent: #1089ff;
    --cl-accent-rgb: 16, 137, 255;
    --cl-dark: #0f172a;
    --cl-gray-900: #111827;
    --cl-gray-700: #374151;
    --cl-gray-500: #6b7280;
    --cl-gray-300: #d1d5db;
    --cl-gray-100: #f3f4f6;
    --cl-surface: #ffffff;
    --cl-surface-alt: #f8faff;
    --cl-border: #e5e7eb;
    --cl-success: #059669;
    --cl-radius-sm: 8px;
    --cl-radius-md: 16px;
    --cl-radius-lg: 24px;
    --cl-radius-xl: 32px;
    --cl-shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --cl-shadow-md: 0 4px 14px rgba(0,0,0,.07);
    --cl-shadow-lg: 0 10px 40px rgba(0,0,0,.08);
    --cl-shadow-xl: 0 20px 60px rgba(0,0,0,.10);
    --cl-shadow-glow: 0 0 40px rgba(var(--cl-accent-rgb), .15);
}

/* Dark mode overrides */
[data-atina-theme="dark"] {
    --cl-surface: #1a1a2e;
    --cl-surface-alt: #16213e;
    --cl-border: #2d2d44;
    --cl-gray-100: #1e1e32;
    --cl-gray-300: #4a4a5e;
    --cl-gray-500: #9ca3af;
    --cl-gray-700: #d1d5db;
    --cl-gray-900: #f9fafb;
}

/* --- Animations --- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(30px); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes floatGentle {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-12px); }
}

@keyframes shimmer {
    0%   { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes pulse-ring {
    0%   { transform: scale(.95); box-shadow: 0 0 0 0 rgba(var(--cl-accent-rgb), .4); }
    70%  { transform: scale(1); box-shadow: 0 0 0 14px rgba(var(--cl-accent-rgb), 0); }
    100% { transform: scale(.95); box-shadow: 0 0 0 0 rgba(var(--cl-accent-rgb), 0); }
}

/* Utility classes for animations */
.anim-fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity .7s cubic-bezier(.22,1,.36,1), transform .7s cubic-bezier(.22,1,.36,1);
}

.anim-fade-in-up.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.anim-delay-1 { transition-delay: .1s; }
.anim-delay-2 { transition-delay: .2s; }
.anim-delay-3 { transition-delay: .3s; }
.anim-delay-4 { transition-delay: .4s; }

/* --- Hero Revamp --- */
.hero-revamp {
    position: relative;
    padding: 80px 0 60px;
    overflow: hidden;
    background: linear-gradient(170deg, var(--cl-surface) 0%, var(--cl-surface-alt) 100%);
}

.hero-revamp::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -20%;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(var(--cl-accent-rgb), .07) 0%, transparent 70%);
    pointer-events: none;
}

.hero-revamp::after {
    content: '';
    position: absolute;
    bottom: -40%;
    left: -10%;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(var(--cl-primary-rgb), .05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-revamp__badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(var(--cl-primary-rgb), .08);
    color: var(--cl-primary);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .02em;
    margin-bottom: 20px;
    animation: fadeInUp .6s ease both;
}

.hero-revamp__badge i {
    font-size: 14px;
}

.hero-revamp__title {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    line-height: 1.15;
    color: var(--cl-gray-900);
    margin-bottom: 20px;
    letter-spacing: -.02em;
    animation: fadeInUp .6s ease .1s both;
}

.hero-revamp__title span {
    background: linear-gradient(135deg, var(--cl-primary) 0%, var(--cl-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-revamp__sub {
    font-size: 1.1rem;
    color: var(--cl-gray-500);
    line-height: 1.7;
    max-width: 520px;
    margin-bottom: 28px;
    animation: fadeInUp .6s ease .2s both;
}

.hero-revamp__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 32px;
    animation: fadeInUp .6s ease .3s both;
}

.hero-revamp__checks {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    animation: fadeInUp .6s ease .35s both;
}

.hero-revamp__check {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--cl-gray-500);
}

.hero-revamp__check i {
    color: var(--cl-success);
    font-size: 16px;
}

/* Hero preview card */
.hero-preview {
    position: relative;
    animation: fadeInRight .8s ease .2s both;
}

.hero-preview__frame {
    position: relative;
    border-radius: var(--cl-radius-lg);
    overflow: hidden;
    box-shadow: var(--cl-shadow-xl), var(--cl-shadow-glow);
    border: 1px solid var(--cl-border);
    transition: transform .4s cubic-bezier(.22,1,.36,1), box-shadow .4s ease;
}

.hero-preview__frame:hover {
    transform: translateY(-6px);
    box-shadow: var(--cl-shadow-xl), 0 0 60px rgba(var(--cl-accent-rgb), .20);
}

.hero-preview__frame img {
    width: 100%;
    display: block;
}

.hero-preview__play {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,.15);
    opacity: 0;
    transition: opacity .3s ease;
}

.hero-preview__frame:hover .hero-preview__play {
    opacity: 1;
}

.hero-preview__play-btn {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: rgba(255,255,255,.95);
    color: var(--cl-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: 0 8px 30px rgba(0,0,0,.15);
    animation: pulse-ring 2s infinite;
}

.hero-preview__cta {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

/* Floating indicator badges */
.hero-preview__float {
    position: absolute;
    z-index: 3;
    padding: 12px 18px;
    border-radius: var(--cl-radius-md);
    background: var(--cl-surface);
    box-shadow: var(--cl-shadow-lg);
    border: 1px solid var(--cl-border);
    display: flex;
    align-items: center;
    gap: 10px;
    animation: floatGentle 4s ease-in-out infinite;
}

.hero-preview__float--top {
    top: -16px;
    right: -12px;
    animation-delay: 0s;
}

.hero-preview__float--bottom {
    bottom: -16px;
    left: -12px;
    animation-delay: 2s;
}

.hero-preview__float-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.hero-preview__float-icon--primary {
    background: rgba(var(--cl-primary-rgb), .1);
    color: var(--cl-primary);
}

.hero-preview__float-icon--accent {
    background: rgba(var(--cl-accent-rgb), .1);
    color: var(--cl-accent);
}

/* --- Social Proof Strip --- */
.proof-strip {
    padding: 36px 0;
    background: var(--cl-surface-alt);
    border-top: 1px solid var(--cl-border);
    border-bottom: 1px solid var(--cl-border);
}

.proof-strip__item {
    text-align: center;
    padding: 8px 0;
}

.proof-strip__number {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--cl-primary);
    letter-spacing: -.02em;
}

.proof-strip__label {
    font-size: 14px;
    color: var(--cl-gray-500);
    font-weight: 500;
}

/* Avatar Group for Social Proof */
.avatar-group {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 8px;
}

.avatar-group img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid #fff;
    object-fit: cover;
    margin-left: -10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.avatar-group img:first-child {
    margin-left: 0;
}

/* --- Feature Cards (Revamped) --- */
.feature-card-v2 {
    background: var(--cl-surface);
    border: 1px solid var(--cl-border);
    border-radius: var(--cl-radius-lg);
    padding: 32px 28px;
    height: 100%;
    transition: all .35s cubic-bezier(.22,1,.36,1);
    position: relative;
    overflow: hidden;
}

.feature-card-v2::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--cl-primary), var(--cl-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .35s ease;
}

.feature-card-v2:hover {
    transform: translateY(-6px);
    box-shadow: var(--cl-shadow-lg);
    border-color: rgba(var(--cl-primary-rgb), .15);
}

.feature-card-v2:hover::before {
    transform: scaleX(1);
}

.feature-card-v2__icon {
    width: 56px;
    height: 56px;
    border-radius: var(--cl-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
    background: rgba(var(--cl-primary-rgb), .08);
    color: var(--cl-primary);
    transition: background .3s ease, color .3s ease;
}

.feature-card-v2:hover .feature-card-v2__icon {
    background: var(--cl-primary);
    color: #fff;
}

.feature-card-v2__title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--cl-gray-900);
    margin-bottom: 12px;
}

.feature-card-v2__text {
    color: var(--cl-gray-500);
    font-size: .95rem;
    line-height: 1.65;
    margin-bottom: 0;
}

/* --- How It Works Section --- */
.steps-section {
    position: relative;
}

.step-card {
    text-align: center;
    position: relative;
    padding: 0 16px;
}

.step-card__number {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--cl-primary), var(--cl-accent));
    color: #fff;
    font-weight: 800;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    box-shadow: 0 8px 24px rgba(var(--cl-primary-rgb), .25);
}

.step-card__title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--cl-gray-900);
    margin-bottom: 10px;
}

.step-card__text {
    color: var(--cl-gray-500);
    font-size: .93rem;
    line-height: 1.6;
}

/* connector line between steps */
.step-connector {
    position: absolute;
    top: 28px;
    left: calc(50% + 36px);
    width: calc(100% - 72px);
    height: 2px;
    background: linear-gradient(90deg, rgba(var(--cl-primary-rgb), .3), rgba(var(--cl-accent-rgb), .3));
}

/* --- CTA Section --- */
.cta-banner {
    background: linear-gradient(135deg, var(--cl-primary) 0%, var(--cl-primary-light) 50%, var(--cl-accent) 100%);
    border-radius: var(--cl-radius-xl);
    padding: 56px 40px;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.cta-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(255,255,255,.08) 0%, transparent 50%);
    pointer-events: none;
}

.cta-banner__title {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    font-weight: 800;
    margin-bottom: 16px;
    position: relative;
}

.cta-banner__sub {
    font-size: 1.05rem;
    opacity: .9;
    margin-bottom: 28px;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
}

/* --- Sandbox Banner --- */
.sandbox-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1050;
    background: linear-gradient(135deg, var(--cl-primary), var(--cl-accent));
    color: #fff;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    box-shadow: 0 -4px 20px rgba(0,0,0,.15);
}

.sandbox-banner__text {
    font-size: 15px;
    font-weight: 600;
}

.sandbox-banner__btn {
    padding: 8px 24px;
    border-radius: 999px;
    background: #fff;
    color: var(--cl-primary);
    font-weight: 700;
    font-size: 14px;
    border: none;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease;
    text-decoration: none;
}

.sandbox-banner__btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,.15);
    color: var(--cl-primary);
}

/* --- Responsive Overrides --- */
@media (max-width: 991px) {
    .hero-revamp {
        padding: 60px 0 40px;
        text-align: center;
    }

    .hero-revamp__sub {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-revamp__actions {
        justify-content: center;
    }

    .hero-revamp__checks {
        justify-content: center;
    }

    .hero-preview {
        margin-top: 40px;
    }

    .hero-preview__float--top,
    .hero-preview__float--bottom {
        display: none;
    }

    .step-connector {
        display: none;
    }

    .cta-banner {
        padding: 40px 24px;
    }
}

@media (max-width: 575px) {
    .hero-revamp__title {
        font-size: 1.75rem;
    }

    .proof-strip__number {
        font-size: 1.4rem;
    }
}

/* --- Button Enhancements --- */
.btn-revamp-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--cl-radius-md);
    background: linear-gradient(135deg, var(--cl-primary), var(--cl-accent));
    color: #fff;
    font-weight: 700;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: all .3s cubic-bezier(.22,1,.36,1);
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(var(--cl-primary-rgb), .25);
}

.btn-revamp-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(var(--cl-primary-rgb), .35);
    color: #fff;
}

.btn-revamp-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--cl-radius-md);
    background: var(--cl-surface);
    color: var(--cl-gray-700);
    font-weight: 700;
    font-size: 15px;
    border: 1px solid var(--cl-border);
    cursor: pointer;
    transition: all .3s cubic-bezier(.22,1,.36,1);
    text-decoration: none;
}

.btn-revamp-secondary:hover {
    transform: translateY(-2px);
    border-color: var(--cl-primary);
    color: var(--cl-primary);
    box-shadow: var(--cl-shadow-md);
}

/* White button (for use on dark backgrounds) */
.btn-revamp-white {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--cl-radius-md);
    background: #fff;
    color: var(--cl-primary);
    font-weight: 700;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: all .3s cubic-bezier(.22,1,.36,1);
    text-decoration: none;
}

.btn-revamp-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(0,0,0,.15);
    color: var(--cl-primary);
}

/* Transparent outline button (for dark/gradient backgrounds) */
.btn-revamp-outline-light {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--cl-radius-md);
    background: transparent;
    color: #fff;
    font-weight: 700;
    font-size: 15px;
    border: 1px solid rgba(255,255,255,0.4);
    cursor: pointer;
    transition: all .3s cubic-bezier(.22,1,.36,1);
    text-decoration: none;
}

.btn-revamp-outline-light:hover {
    transform: translateY(-2px);
    border-color: #fff;
    color: #fff;
    background: rgba(255,255,255,0.1);
}

/* --- Section Header Utility --- */
.section-header {
    max-width: 640px;
    margin-bottom: 48px;
}

.section-header--center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    background: rgba(var(--cl-primary-rgb), .08);
    color: var(--cl-primary);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    color: var(--cl-gray-900);
    margin-bottom: 14px;
    letter-spacing: -.015em;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--cl-gray-500);
    line-height: 1.7;
    margin-bottom: 0;
}


/* Honest early-stage social proof: illustrative placeholders, not member photos. */
.avatar-group.avatar-group--illustrative {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
}
.avatar-group__avatar {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    margin-left: -10px;
    border: 3px solid #fff;
    border-radius: 50%;
    color: #fff;
    font-size: 15px;
    box-shadow: 0 3px 10px rgba(21, 39, 68, .14);
}
.avatar-group__avatar:first-child { margin-left: 0; }
.avatar-group__avatar--violet { background: linear-gradient(135deg, #7c3aed, #a78bfa); }
.avatar-group__avatar--blue { background: linear-gradient(135deg, #164085, #4f8ed9); }
.avatar-group__avatar--teal { background: linear-gradient(135deg, #078b7a, #40c9ac); }
.avatar-group__avatar--amber { background: linear-gradient(135deg, #bd6a16, #f5b942); }
.avatar-group__avatar--rose { background: linear-gradient(135deg, #be4868, #f195a9); }
.avatar-group__avatar--indigo { background: linear-gradient(135deg, #3e4caa, #8795ff); }
.proof-strip__number { line-height: 1.2; }
.proof-strip__note { margin-top: 6px; color: #6b7280; font-size: 11px; line-height: 1.45; }
@media (max-width: 575px) {
    .avatar-group__avatar { width: 36px; height: 36px; margin-left: -9px; font-size: 13px; }
    .proof-strip__note { font-size: 10px; }
}