/* Страница презентации с просмотрщиком PDF */

.presentation-page {
    position: relative;
    z-index: 2;
}

.presentation-page__section {
    position: relative;
    padding: calc(var(--header-height) + var(--hero-top-gap) + 24px) 0 80px;
    overflow: hidden;
}

.presentation-page__ambient {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    opacity: 0.85;
}

.presentation-page__ambient .hero__orb--1 {
    top: -15%;
    left: -8%;
    width: min(55vw, 520px);
    height: min(55vw, 520px);
}

.presentation-page__ambient .hero__orb--2 {
    top: 20%;
    right: -12%;
    width: min(50vw, 480px);
    height: min(50vw, 480px);
}

html[data-theme="light"] .presentation-page__ambient {
    display: none;
}

html[data-theme="dark"] .presentation-page__section {
    background:
        radial-gradient(ellipse 70% 55% at 18% 15%, rgba(124, 92, 255, 0.2), transparent 58%),
        radial-gradient(ellipse 65% 50% at 82% 45%, rgba(0, 212, 255, 0.12), transparent 55%);
}

.presentation-page__container {
    position: relative;
    z-index: 1;
}

.presentation-page .section-kicker-head {
    margin-bottom: clamp(20px, 3vw, 32px);
}

.presentation-page .section-kicker-head__desc {
    max-width: 640px;
}

.pdf-viewer {
    display: flex;
    flex-direction: column;
    width: 100%;
    min-height: min(78vh, 920px);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    backdrop-filter: blur(12px);
}

html[data-theme="dark"] .pdf-viewer {
    background: rgba(12, 16, 38, 0.72);
    border-color: rgba(255, 255, 255, 0.1);
}

.pdf-viewer.is-fullscreen {
    background: #0a0e27;
    border: 0;
    border-radius: 0;
    min-height: 100%;
}

.pdf-viewer.is-fullscreen .pdf-viewer__stage {
    min-height: calc(100dvh - 64px);
}

.pdf-viewer__toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px 16px;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    background: var(--surface-strong);
}

html[data-theme="dark"] .pdf-viewer__toolbar {
    background: rgba(255, 255, 255, 0.04);
    border-bottom-color: rgba(255, 255, 255, 0.08);
}

.pdf-viewer__group {
    display: flex;
    align-items: center;
    gap: 6px;
}

.pdf-viewer__btn,
.pdf-viewer__zoom-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 10px;
    color: var(--text);
    background: transparent;
    border: 1px solid transparent;
    border-radius: 12px;
    cursor: pointer;
    text-decoration: none;
    transition: background var(--t-fast) var(--easing), border-color var(--t-fast) var(--easing), color var(--t-fast) var(--easing);
}

.pdf-viewer__btn:hover:not(:disabled):not(.is-disabled),
.pdf-viewer__zoom-label:hover:not(:disabled) {
    background: rgba(124, 92, 255, 0.12);
    border-color: rgba(124, 92, 255, 0.28);
    color: var(--accent);
}

.pdf-viewer__btn:focus-visible,
.pdf-viewer__zoom-label:focus-visible,
.pdf-viewer__page-input:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.pdf-viewer__btn:disabled,
.pdf-viewer__btn.is-disabled,
.pdf-viewer__zoom-label:disabled {
    opacity: 0.4;
    cursor: default;
    pointer-events: none;
}

.pdf-viewer__icon-exit {
    display: none;
}

.pdf-viewer.is-fullscreen .pdf-viewer__icon-full {
    display: none;
}

.pdf-viewer.is-fullscreen .pdf-viewer__icon-exit {
    display: block;
}

.pdf-viewer__pager {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-2);
}

.pdf-viewer__page-input {
    width: 52px;
    height: 36px;
    padding: 0 6px;
    text-align: center;
    font: inherit;
    font-weight: 700;
    color: var(--text);
    background: var(--bg-1);
    border: 1px solid var(--border);
    border-radius: 10px;
    -moz-appearance: textfield;
}

.pdf-viewer__page-input::-webkit-outer-spin-button,
.pdf-viewer__page-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.pdf-viewer__page-sep {
    color: var(--text-4);
}

.pdf-viewer__zoom-label {
    min-width: 64px;
    font-size: 13px;
    font-weight: 700;
    color: var(--text-2);
}

.pdf-viewer__stage {
    position: relative;
    flex: 1 1 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: min(68vh, 820px);
    padding: 20px;
    overflow: auto;
    background:
        radial-gradient(ellipse at top, var(--grad-spot-1), transparent 55%),
        var(--bg-1);
    touch-action: pan-y;
}

html[data-theme="dark"] .pdf-viewer__stage {
    background:
        radial-gradient(ellipse at top, rgba(124, 92, 255, 0.12), transparent 55%),
        #080b1c;
}

.pdf-viewer__canvas {
    display: block;
    max-width: 100%;
    height: auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
}

.pdf-viewer__state {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 32px 24px;
    text-align: center;
    color: var(--text-2);
}

.pdf-viewer__state[hidden],
.pdf-viewer__canvas[hidden] {
    display: none;
}

.pdf-viewer__empty-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    margin-bottom: 4px;
    color: var(--accent);
    background: rgba(124, 92, 255, 0.12);
    border: 1px solid rgba(124, 92, 255, 0.22);
    border-radius: 22px;
}

.pdf-viewer__empty-title {
    margin: 0;
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 600;
    color: var(--text);
}

.pdf-viewer__empty-text {
    margin: 0;
    max-width: 520px;
    line-height: 1.55;
}

.pdf-viewer__empty-text code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.92em;
    padding: 1px 6px;
    color: var(--text);
    background: var(--surface-strong);
    border: 1px solid var(--border);
    border-radius: 6px;
}

.pdf-viewer__spinner {
    width: 36px;
    height: 36px;
    border: 3px solid rgba(124, 92, 255, 0.2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: pdf-spin 0.8s linear infinite;
}

.pdf-viewer__fallback {
    width: 100%;
    min-height: 68vh;
    border: 0;
    background: #fff;
}

@keyframes pdf-spin {
    to { transform: rotate(360deg); }
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 720px) {
    .presentation-page__section {
        padding-bottom: 48px;
    }

    .pdf-viewer {
        min-height: 0;
        border-radius: var(--radius-md);
    }

    .pdf-viewer__toolbar {
        justify-content: center;
        padding: 8px 10px;
    }

    .pdf-viewer__group--zoom {
        display: none;
    }

    .pdf-viewer__stage {
        min-height: 62vh;
        padding: 12px;
    }

    .pdf-viewer__empty-title {
        font-size: 18px;
    }
}