* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.25s ease, border-color 0.2s ease, box-shadow 0.2s ease, color 0.2s, background-image 0.3s ease;
}

body {
    font-family: 'Segoe UI', 'Poppins', 'Inter', system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem 1.5rem;
    position: relative;
    transition: background 0.4s ease;
}

.tool-container {
    max-width: 1400px;
    width: 100%;
    border-radius: 3rem;
    backdrop-filter: blur(8px);
    padding: 2rem;
    transition: all 0.3s ease;
    box-shadow: 0 30px 50px -20px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255,255,220,0.3);
}

.header {
    text-align: center;
    margin-bottom: 2rem;
}
.header h1 {
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
    background-clip: text;
    -webkit-background-clip: text;
}
.sub {
    margin-top: 0.6rem;
    font-weight: 500;
    opacity: 0.9;
    backdrop-filter: blur(4px);
    display: inline-block;
    padding: 0.2rem 1.2rem;
    border-radius: 40px;
}

.theme-palette {
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(8px);
    border-radius: 80px;
    padding: 0.6rem 1.2rem;
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.8rem;
    margin-top: 1rem;
    margin-bottom: 0.8rem;
    border: 1px solid rgba(255,250,210,0.6);
}
.theme-btn {
    width: 48px;
    height: 48px;
    border-radius: 60px;
    cursor: pointer;
    border: 2px solid rgba(255,255,240,0.9);
    transition: 0.2s;
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
}
.theme-btn:hover {
    transform: scale(1.12);
    border-color: white;
    box-shadow: 0 6px 14px rgba(0,0,0,0.25);
}
.theme-btn.active {
    border: 3px solid white;
    box-shadow: 0 0 0 2px #1f1f1f, 0 6px 14px black;
    transform: scale(1.05);
}

.dual-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 2rem;
}
.panel {
    flex: 1;
    min-width: 280px;
    background: rgba(255, 255, 245, 0.94);
    border-radius: 2rem;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: all 0.25s;
    box-shadow: 0 12px 28px -8px rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(2px);
}
.panel:hover {
    transform: translateY(-5px);
}
.panel-header {
    padding: 1.2rem 1.6rem;
    border-bottom: 2px solid;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}
.panel-header h2 {
    font-size: 1.45rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.badge {
    border-radius: 60px;
    padding: 0.2rem 0.8rem;
    font-size: 0.7rem;
    font-weight: 700;
}
.action-buttons {
    display: flex;
    gap: 8px;
}
.icon-btn {
    border: none;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    padding: 6px 14px;
    border-radius: 40px;
    transition: 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.icon-btn:hover {
    transform: scale(0.96);
    filter: brightness(0.94);
}
.textarea-wrapper {
    padding: 1.4rem 1.6rem 1.6rem;
    flex: 1;
}
textarea {
    width: 100%;
    min-height: 280px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.9rem;
    line-height: 1.55;
    padding: 1rem 1.2rem;
    border: 2px solid;
    border-radius: 1.5rem;
    background: rgba(255, 255, 250, 0.95);
    resize: vertical;
    outline: none;
    transition: 0.2s;
}
textarea:focus {
    box-shadow: 0 0 0 4px rgba(0, 0, 0, 0.1);
}
.info-text {
    font-size: 0.7rem;
    margin-top: 0.7rem;
    display: flex;
    justify-content: space-between;
    padding: 0.3rem 0.8rem;
    border-radius: 40px;
    font-weight: 500;
}
.char-counter {
    padding: 0.2rem 0.6rem;
    border-radius: 30px;
}
.action-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin: 0.5rem 0 1.5rem;
}
.primary-btn, .secondary-btn {
    border: none;
    padding: 0.8rem 1.8rem;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 3rem;
    cursor: pointer;
    transition: 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.primary-btn {
    color: white;
    box-shadow: 0 5px 12px rgba(0,0,0,0.2);
}
.primary-btn:hover {
    transform: translateY(-3px);
    filter: brightness(1.05);
}
.secondary-btn {
    border: 1px solid;
}
.secondary-btn:hover {
    transform: translateY(-2px);
    filter: brightness(0.96);
}
footer {
    text-align: center;
    font-size: 0.7rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(0,0,0,0.1);
}
.toast-msg {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%) scale(0.9);
    padding: 10px 28px;
    border-radius: 60px;
    font-size: 0.9rem;
    font-weight: 600;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    backdrop-filter: blur(12px);
    opacity: 0;
    transition: opacity 0.2s, transform 0.2s;
    pointer-events: none;
    z-index: 1000;
    white-space: nowrap;
}
.toast-msg.show {
    opacity: 1;
    transform: translateX(-50%) scale(1);
}
.bg-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    opacity: 0.45;
    transition: background-image 0.3s ease;
}
@media (max-width: 720px) {
    .tool-container { padding: 1.2rem; }
    textarea { min-height: 180px; }
    .toast-msg { white-space: normal; width: 80%; text-align: center; }
    .theme-btn { width: 40px; height: 40px; font-size: 1.2rem; }
}