/* Unified Common Styles */
* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
}

body {
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background: var(--bg-gradient);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
}

.container {
    width: min(900px, calc(100% - 28px));
    margin: 0 auto;
    padding: 22px 0 36px;
}

.container.tool-container {
    width: min(700px, calc(100% - 28px));
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 7px 12px;
    border-radius: 999px;
    border: 1px solid color-mix(in srgb, var(--primary) 40%, transparent);
    background: color-mix(in srgb, var(--surface-1) 74%, transparent);
    transition: transform 0.24s ease, background-color 0.24s ease, border-color 0.24s ease, box-shadow 0.24s ease;
}

.back-link:hover {
    transform: translateY(-2px);
    background: color-mix(in srgb, var(--primary-soft) 70%, var(--surface-1));
    box-shadow: 0 8px 18px color-mix(in srgb, var(--primary-glow) 34%, transparent);
}

.back-link:active {
    transform: translateY(0) scale(0.98);
}

.main-title {
    text-align: center;
    margin: 14px 0 22px;
    color: var(--title-main);
    text-shadow: 0 0 12px var(--title-glow);
    letter-spacing: 0.9px;
    font-weight: 700;
}

.main-panel,
.key-section,
.convert-section,
.glass-panel {
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow-1);
}

.text-input,
.key-input,
.search-input,
.input-field,
.text-output,
.rail-input {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: var(--surface-3);
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.93rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.text-input::placeholder,
.key-input::placeholder,
.search-input::placeholder {
    color: color-mix(in srgb, var(--text-sub) 86%, transparent);
}

.text-input:focus,
.key-input:focus,
.search-input:focus,
.input-field:focus,
.text-output:focus,
.rail-input:focus {
    border-color: color-mix(in srgb, var(--primary) 78%, white 22%);
    box-shadow: var(--focus-ring);
}

.btn,
button,
.icon-btn,
.action-btn,
.theme-toggle {
    font-family: inherit;
}

.btn,
.icon-btn,
.action-btn {
    min-height: 44px;
    padding: 0 14px;
    border-radius: 10px;
    border: 1px solid color-mix(in srgb, var(--primary) 38%, transparent);
    background: color-mix(in srgb, var(--primary-soft) 74%, transparent);
    color: var(--text-main);
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover,
.icon-btn:hover,
.action-btn:hover {
    transform: translateY(-2px);
    background: color-mix(in srgb, var(--primary-soft) 88%, transparent);
    border-color: color-mix(in srgb, var(--primary) 54%, transparent);
    box-shadow: 0 10px 20px color-mix(in srgb, var(--primary-glow) 24%, transparent);
}

.btn:active,
.icon-btn:active,
.action-btn:active,
.theme-toggle:active {
    transform: translateY(0) scale(0.98);
    filter: brightness(0.95);
}

.btn-decrypt {
    color: color-mix(in srgb, var(--primary) 80%, white 20%);
    border-color: color-mix(in srgb, var(--primary) 58%, transparent);
    background: color-mix(in srgb, var(--primary-soft) 84%, transparent);
}

.btn-encrypt {
    color: color-mix(in srgb, var(--accent) 74%, white 26%);
    border-color: color-mix(in srgb, var(--accent) 45%, transparent);
    background: color-mix(in srgb, var(--accent) 17%, transparent);
}

.btn.error,
.action-btn.warn,
.icon-btn.close,
button.warn {
    color: color-mix(in srgb, var(--danger) 72%, white 28%);
    border-color: color-mix(in srgb, var(--danger) 54%, transparent);
    background: var(--danger-soft);
}

.shake,
.text-input.error,
.key-input.error,
.btn.error,
.error-shake {
    animation: shake 0.25s linear;
}

.toast {
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%) translateY(18px);
    background: var(--toast-bg);
    color: var(--toast-text);
    border: 1px solid color-mix(in srgb, var(--primary) 42%, transparent);
    border-radius: 10px;
    padding: 10px 14px;
    box-shadow: var(--shadow-1);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.26s ease, transform 0.26s ease;
    z-index: 2100;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.modal {
    visibility: hidden;
    opacity: 0;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0);
    transition: opacity 0.28s ease, background-color 0.28s ease;
    z-index: 2000;
}

.modal.show {
    visibility: visible;
    opacity: 1;
    background: rgba(0, 0, 0, 0.68);
}

.modal-content {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: min(560px, calc(100% - 26px));
    max-height: 80vh;
    overflow-y: auto;
    padding: 22px;
    border-radius: 14px;
    background: var(--surface-1);
    border: 1px solid var(--line-strong);
    box-shadow: var(--shadow-2);
}

.modal:not(.show) .modal-content {
    opacity: 0;
    transform: translate(-50%, calc(-50% + 20px));
}

.modal.show .modal-content {
    opacity: 1;
    transform: translate(-50%, -50%);
    transition: transform 0.28s ease, opacity 0.28s ease;
}

.theme-toggle {
    position: fixed;
    top: 18px;
    right: 18px;
    width: 60px;
    height: 32px;
    border-radius: 16px;
    border: 1px solid var(--line-strong);
    background: color-mix(in srgb, var(--surface-1) 88%, transparent);
    cursor: pointer;
    transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
    z-index: 2100;
}

.theme-toggle:hover {
    box-shadow: 0 10px 18px color-mix(in srgb, var(--primary-glow) 26%, transparent);
}

.theme-toggle-slider {
    position: absolute;
    left: 3px;
    top: 3px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: linear-gradient(180deg, #ea4e7def, #ff6d87ef);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1), background 0.28s ease;
}

[data-theme="dark"] .theme-toggle-slider {
    transform: translateX(28px);
    background: linear-gradient(180deg, #8ff0ff, #00d2ff);
}

@keyframes shake {
    0% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    50% { transform: translateX(4px); }
    75% { transform: translateX(-4px); }
    100% { transform: translateX(0); }
}

/* ── 页面入场动画（任意工具页挂 .page-enter 即可）────────── */
@keyframes pageEnter {
    from { opacity: 0; transform: translateY(14px); }
    to   { opacity: 1; transform: translateY(0); }
}

.page-enter {
    animation: pageEnter 0.34s ease both;
}

/* ── 标题行（工具名 + 帮助按钮）────────────────────────────── */
.title-wrap {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.help-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--line-strong);
    background: var(--primary-soft);
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.2s ease;
}

.help-icon:hover {
    transform: translateY(-2px) scale(1.04);
    background: color-mix(in srgb, var(--primary-soft) 86%, transparent);
}

@media (max-width: 700px) {
    .container,
    .container.tool-container {
        width: calc(100% - 20px);
    }

    .theme-toggle {
        top: 12px;
        right: 12px;
    }
}