/* ===================== COLOR VARIABLES ===================== */
:root {
    --bg-dark: #0a0a0a;
    --bg-light: #f5f5f5;
    --text-dark: #eaeaea;
    --text-light: #111;
    --neon-purple: #9b5cff;
    --neon-glow: 0 0 8px rgba(155,92,255,0.8),
                 0 0 18px rgba(155,92,255,0.6);
}

/* ===================== DARK / LIGHT MODE ===================== */
body.dark-mode {
    background: var(--bg-dark);
    color: var(--text-dark);
}

body.light-mode {
    background: var(--bg-light);
    color: var(--text-light);
}

/* ===================== LOGO ===================== */
.logo .yin {
    color: #ffffff;
}

.logo .yang {
    color: var(--neon-purple);
    text-shadow: var(--neon-glow);
}

/* ===================== NEON TEXT ===================== */
.neon-text {
    color: var(--neon-purple);
    text-shadow: var(--neon-glow);
}

/* ===================== NAVBAR ===================== */
.navbar {
    box-shadow: 0 4px 20px rgba(0,0,0,0.6);
}

nav ul li a.active,
nav ul li a:hover {
    color: var(--neon-purple);
    text-shadow: 0 0 6px rgba(155,92,255,0.7);
}

/* ===================== THEME TOGGLE ===================== */
.theme-toggle {
    width: 44px;
    height: 22px;
    background: rgba(255,255,255,0.1);
    border-radius: 22px;
    position: relative;
    cursor: pointer;
}

.theme-toggle span {
    position: absolute;
    top: 3px;
    left: 4px;
    width: 16px;
    height: 16px;
    background: var(--neon-purple);
    border-radius: 50%;
    box-shadow: var(--neon-glow);
    transition: 0.3s;
}

body.light-mode .theme-toggle span {
    left: 24px;
}

/* ===================== BUTTON GLOW ===================== */
.btn.primary {
    box-shadow: var(--neon-glow);
}

.btn.primary:hover {
    box-shadow: 0 0 16px rgba(155,92,255,1);
}

.btn.secondary:hover {
    background: var(--neon-purple);
    color: #fff;
}

/* ===================== CARDS ===================== */
.converter-card,
.service-card,
.feature,
.tech-card,
.step,
.auth-container {
    transition: 0.3s;
}

.converter-card:hover,
.service-card:hover,
.feature:hover,
.tech-card:hover,
.step:hover {
    transform: translateY(-6px);
    box-shadow: var(--neon-glow);
}

/* ===================== HERO GLOW ===================== */
.glow-circle {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(155,92,255,0.25), transparent 70%);
    filter: blur(40px);
}

/* ===================== UPLOAD BOX ===================== */
.upload-label:hover {
    border-color: var(--neon-purple);
    box-shadow: var(--neon-glow);
}

/* ===================== FORM FOCUS ===================== */
.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--neon-purple);
    box-shadow: 0 0 8px rgba(155,92,255,0.6);
    outline: none;
}

/* ===================== PROCESS STEPS ===================== */
.step span {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: var(--neon-purple);
    color: #fff;
    border-radius: 50%;
    line-height: 40px;
    margin-bottom: 10px;
    box-shadow: var(--neon-glow);
}

/* ===================== FOOTER ===================== */
.footer {
    border-top: 1px solid rgba(255,255,255,0.05);
}

/* ===================== LIGHT MODE ADJUSTMENTS ===================== */
body.light-mode .navbar {
    background: rgba(255,255,255,0.9);
}

body.light-mode .converter-card,
body.light-mode .service-card,
body.light-mode .auth-container {
    background: rgba(0,0,0,0.04);
    color: #111;
}

body.light-mode .form-group label {
    background: var(--bg-light);
}